ST3485EB, EC, EIY Datasheet by STMicroelectronics

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Features
ESD protection
±15 kV IEC 61000-4-2 air discharge
±8 kV IEC 61000-4-2 contact discharge
Operate from a single 3.3 V supply - no charge pump required
Interoperable with 5 V logic
1 µA low current shutdown mode max.
Guaranteed 12 Mbps data rate
-7 to 12 V common mode input voltage range
Half duplex versions available
Industry standard 75176 pinout
Current limiting and thermal shutdown for driver overload protection
Guaranteed high receiver output state for floating inputs with no signal present
Allow up to 64 transceivers on the bus
Available in SO8 package
Automotive grade (ST3485EIY)
Description
The ST3485EB, ST3485EC, ST3485EI and ST3485EIY devices are ±15 kV ESD
protected, 3.3 V low power transceiver for RS-485 and RS-422 communications.
These devices contain one driver and one receiver in half duplex configuration.
These devices transmit and receive at a guaranteed data rate of at least 12 Mbps.
All transmitter outputs and receiver inputs are protected to ±15 kV IEC 61000-4-2 air
discharge.
The driver is short-circuit current limited and is protected against excessive power
dissipation by thermal shutdown circuitry that places the driver outputs into a high
impedance state.
Product status link
ST3485EB, ST3485EC, ST3485EI and
ST3485EIY
3.3 V powered, 15 kV ESD protected, up to 12 Mbps RS-485/ RS-422 transceiver
ST3485EB, ST3485EC
ST3485EI, ST3485EIY
Datasheet
DS2947 - Rev 12 - March 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
_|__|__|__|_ [[[[
1Pin configuration
Figure 1. Pin connections
RO
RE
DE
DI
VCC
GND
B
A
1
2
3
4
8
7
6
5
Table 1. Pin description
Pin n° Symbol Name and function
1 RO Receiver output. If A > B by 200 mV, RO will be high; if A < B by 200 mV, RO will be low.
2 RE Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is
high. If RE is high and DE is low, the device will enter a low power shutdown mode.
3 DE
Driver output enable. The driver outputs are enabled by bringing DE high. They are high
impedance when DE is low. If RE is high DE is low, the device will enter a low-power
shutdown mode. If the driver outputs are enabled, the part functions as line driver, while
they are high impedance, it functions as line receivers if RE is low.
4 DI Driver input. A low on DI forces output A low and output B high. Similarly, a high on DI
forces output A high and output B low.
5 GND Ground.
6 A Non-inverting receiver input and non-inverting driver output.
7 B Inverting receiver input and inverting driver output.
8 VCC Supply voltage: VCC = 3 V to 3.6 V.
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Pin configuration
DS2947 - Rev 12 page 2/23
2Truth tables
Table 2. Truth table (driver)
Inputs Outputs
Mode
RE DE DI B A
X H
H L H
Normal
L H L
L
L X Z Z
H Shutdown
Note: X = “don’t care”; Z = high impedance
Table 3. Truth table (receiver)
Inputs Output
Mode
RE DE A-B RO
L
L
≥ 0.2 V H
Normal
≤ -0.2 V L
Inputs open H
H X Z Shutdown
Note: X = “do not care”; Z = high impedance
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Truth tables
DS2947 - Rev 12 page 3/23
(T
3Maximum ratings
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation
under these condition is not implied.
Table 4. Absolute maximum ratings
Symbol Parameter Value Unit
VCC Supply voltage 7 V
VIControl input voltage ( RE ,
DE) -0.3 to 7 V
VDI Driver input voltage (DI) -0.3 to 7 V
VDO Driver output voltage (A, B) ±14 V
VRI Receiver input voltage (A, B) ±14 V
VRO Receiver output voltage (RO) -0.3 to (VCC + 0.3) V
Rthj-a Junction-ambient 125 °C/W
ESD
HBM: human body model for
the line inputs (A and B) (1) 12
kV
HBM: human body model for
the logic inputs (DI, DE, RE )
(1)
4
HBM: human body model for
all other pins (1) 2
CDM: charged device model
(2) 1.5
1. Human body model: 100 pF discharged through a 1.5 kΩ resistor between two pins of the device, done for all couples of pin
combinations with other pins floating.
2. Charged device model: all pins plus package are charged together to the specified voltage and then discharged directly to
ground.
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Maximum ratings
DS2947 - Rev 12 page 4/23
4Electrical characteristics
Table 5. Electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for the
ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are
referred to TA = 25 °C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
ISUPPLY VCC power supply current No load, DI = 0 V or VCC
DE = VCC, RE = 0 V
or VCC
1.3 2.2
mA
DE = 0 V, RE = 0 V 1.2 1.9
ISHDN Shutdown supply current DE = 0 V, RE = VCC, DI = 0 V or VCC 0.002 1 µA
Table 6. Logic input electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for
the ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values
are referred to TA = 25 °C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
VIL Input logic threshold low DE, DI, RE 1.3 0.8
V
VIH Input logic threshold high DE, DI, RE 2
IIN1 Logic input current DE, DI, RE ±2.0 µA
IIN2 Input current (A, B) DE = 0 V, VCC= 0 or 3.6 V
VIN = 12 V 1
mA
VIN = -7 V -0.8
Table 7. Transmitter electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for
the ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values
are referred to TA = 25 °C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
VOD Differential drive output
RL= 100 Ω (RS-422) Figure 2. Driver and VOC test
load 2
V
RL= 54 Ω (RS-485) Figure 2. Driver and VOC test load 1.5
RL= 60 Ω (RS-485)Figure 3. Driver VOD with varying
common mode voltage test load 1.5
∆VOD
Change in magnitude of driver
differential output voltage for
complementary output states (1)
RL= 54 Ω or 100 ΩFigure 2. Driver and VOC test load 0.2
VOC Driver common mode output
voltage RL= 54 Ω or 100 ΩFigure 2. Driver and VOC test load 3
∆VOC Change in magnitude of driver
common mode output voltage(1) RL= 54 Ω or 100 ΩFigure 2. Driver and VOC test load 0.2
IOSD Driver short-circuit output current ±250 mA
1. ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state.
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Electrical characteristics
DS2947 - Rev 12 page 5/23
Table 8. Receiver electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C
for ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are
referred to TA = 25 °C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
VTH Receiver differential threshold
voltage VCM = -7 V to 12 V, DE = 0 -0.2 0.2 V
∆VTH Receiver input hysteresis VCM = 0 V 70 mV
VOH Receiver output high voltage IOUT = -4 mA, VID = 200 mV (Figure 4. Receiver
VOH and VOL test circuit)2
V
VOL Receiver output low voltage IOUT = 4 mA, VID = -200 mV (Figure 4. Receiver
VOH and VOL test circuit)0.4
IOZR 3-state (high impedance) output
current at receiver VCC = 3.6 V, VO = 0 V to VCC ±1 µA
RRIN Receiver input resistance VCM = -7 V to 12 V 24 kΩ
IOSR Receiver short-circuit current VRO = 0 V to VCC 7 60 mA
Table 9. Driver switching characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for the ST3485ECDR, TA = -40 to 85 °C for
the ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values
are referred to TA = 25 °C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
DRMaximum data rate 12 15 Mbps
tDD Differential output delay
RL= 60 Ω, CL = 15 pF Figure 5. Drive
differential output delay transition time test circuit
Figure 6. Drive differential output delay transition
time waveform
18 30
ns
tTD Differential output transition time
RL= 60 Ω, CL = 15 pF Figure 5. Drive
differential output delay transition time test circuit
Figure 6. Drive differential output delay transition
time waveform
12 20
tPLH tPHL Propagation delay
RL= 27 Ω, CL = 15 pF Figure 9. Drive
propagation time test circuit Figure 10. Drive
propagation time waveform
18 30
tPDS
|tPLH - tPHL| driver propagation
delay skew (1)
RL= 27 Ω, CL = 15 pF Figure 9. Drive
propagation time test circuit Figure 10. Drive
propagation time waveform
2 5
tPZL Output enable time
RL= 110 Ω Figure 11. Drive enable and
disable times test circuit (pull-up configuration)
Figure 12. Drive enable and disable times
waveforms (pull-up configuration)
19 35
tPZH Output enable time
RL= 110 Ω Figure 7. Drive enable and
disable times test circuit (pull-down configuration)
Figure 8. Drive enable and disable times
waveforms (pull-down configuration)
30 50
tPHZ Output disable time
RL= 110 Ω Figure 7. Drive enable and
disable times test circuit (pull-down configuration)
Figure 8. Drive enable and disable times
waveforms (pull-down configuration)
19 35
tPLZ Output disable time
RL= 110 Ω Figure 11. Drive enable and
disable times test circuit (pull-up configuration)
Figure 12. Drive enable and disable times
waveforms (pull-up configuration)
30 50
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Electrical characteristics
DS2947 - Rev 12 page 6/23
Symbol Parameter Test conditions Min. Typ. Max. Unit
tSKEW
ns
Differential output delay skew 1 3
tPSH Driver enable from shutdown to
output high
RL = 110 Ω Figure 7. Drive enable and
disable times test circuit (pull-down configuration)
Figure 8. Drive enable and disable times
waveforms (pull-down configuration)
30 50
tPSL Driver enable from shutdown to
output low
RL = 110 Ω Figure 11. Drive enable and
disable times test circuit (pull-up configuration)
Figure 12. Drive enable and disable times
waveforms (pull-up configuration)
19 35
1. Measured on |tPLH(A)-tPHL(A)| and |tPLH(B)-tPHL(B)|.
Table 10. Receiver switching characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C
for ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are
referred to TA = 25 °C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
tRPLH, tRPHL Propagation delay
VID = 0 V to 3 V, CL = 15 pF (Figure 13. Receiver
propagation delay time test circuit and
Figure 14. Receiver propagation delay time
waveforms)
30 50
ns
tRPDS
|tRPLH - tRPHL| receiver
propagation delay skew
VID = 0 V to 3 V, CL = 15 pF (Figure 13. Receiver
propagation delay time test circuit and
Figure 14. Receiver propagation delay time
waveforms)
1 3
tPRZL Receiver output enable time to
low level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 17. Receiver
enable and disable times waveform (test 2))
10 20
tPRZH Receiver output enable time to
high level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 16. Receiver
enable and disable times waveform (test 1))
10 20
tPRHZ Receiver output disable time
from high level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 18. Receiver
enable and disable times waveform (test 3))
10 20
tPRLZ Receiver output disable time
from low level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 19. Receiver
enable and disable times waveform (test 4))
10 20
tPRSH Receiver output enable time
from shutdown to high level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 16. Receiver
enable and disable times waveform (test 1))
10 20
tPRSL Receiver output enable time
from shutdown to low level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 17. Receiver
enable and disable times waveform (test 2))
20 40 µs
Notes:
1. ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state.
2. Measured on |tPLH(A) - tPHL(A)| and |tPLH(B) - tPHL(B)|.
3. The transceivers are put into shutdown by bring RE high and DE low. If the input are in state for less than 80
ns, the part are guaranteed not to enter shutdown. If the inputs are in this state for at least 300 ns, the parts are
guaranteed to have entered shutdown.
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Electrical characteristics
DS2947 - Rev 12 page 7/23
5Test circuits and typical characteristics
Figure 2. Driver and VOC test load
D
VCC
VOD
VOC
RL
2
RL
2
Figure 3. Driver VOD with varying common mode voltage test load
375 Ω
375 Ω
RL
VOD
VCC
D
VCM = -7 to 12 V
Figure 4. Receiver VOH and VOL test circuit
VID
0 V
R
VOL IOL (+) VOH IOL (-)
Figure 5. Drive differential output delay transition time test circuit
IN (1) D
VCC
CL
RL = 60 Ω
CL = 15 pF (2)
OUT
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
DS2947 - Rev 12 page 8/23
1. The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns, ZO = 50 Ω.
2. CL includes probe and stray capacitance
Figure 6. Drive differential output delay transition time waveform
IN
OUT
1.5 V
tDO tDD
3 V
0 V
2 V
-2 V
50 %
10 %
90 %
tTD
1.5 V
tTD
50 %
10 %
90 %
Figure 7. Drive enable and disable times test circuit (pull-down configuration)
0 V or 3 V
IN(1)
D
S1
CL = 50 pF (2) RL = 110 Ω
OUT
1. The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns.
2. CL includes probe and stray capacitance
Figure 8. Drive enable and disable times waveforms (pull-down configuration)
IN
OUT
tPZH or tPSH
(1)
1.5 V 1.5 V
VOM
tPHZ
3 V
0 V
VOH
0.25 V
0 V
1. tPZH is valid if the driver is initially disabled ( RE is high), tPSH is valid if the driver is initially in shutdown
mode (RE is low).
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
DS2947 - Rev 12 page 9/23
Figure 9. Drive propagation time test circuit
IN(1)
VCC
D
S1
VOM = (VOH = VOL)/2 = 1.5 V
RL = 27 Ω
OUT
CL = 15 pF (2)
1. The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns.
2. CL includes probe and stray capacitance
Figure 10. Drive propagation time waveform
IN
OUT A
OUT B
1.5 V 1.5 V
3 V
0 V
tPHL
tPLH
VOM VOM
tPHL tPLH
VOM VOM
VOH
VOL
VOH
VOL
Figure 11. Drive enable and disable times test circuit (pull-up configuration)
VCC
RL = 110 Ω
OUT
CL = 50 pF(2)
S1
D0 V or 3 V
IN(1)
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
DS2947 - Rev 12 page 10/23
%\ (A: H m
1. The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns.
2. CL includes probe and stray capacitance
Figure 12. Drive enable and disable times waveforms (pull-up configuration)
IN
OUT
tPZL or tPSL
(1)
VOM
1.5 V 1.5 V
tPLZ
0.25 V
3 V
0 V
VCC
VOL
1. tPZL is valid if the driver is initially disabled ( RE is high), tPSL is valid if the driver is initially in shutdown mode
(RE is low).
Figure 13. Receiver propagation delay time test circuit
IN(1)
VID ROUT
CL = 1.5 pF (2)
1.5 V
0 V
1. The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns.
2. CL includes probe and stray capacitance
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
DS2947 - Rev 12 page 11/23
Figure 14. Receiver propagation delay time waveforms
IN
OUT
1.5 V 1.5 V
tRPLH tRPHL
VOM
VOM = VCC/2
VOM
3.0 V
0 V
VCC
0 V
Figure 15. Receiver enable and disable times test circuit
1.5 V
-1.5 V
IN
(1)
S3
VID R
OUT
CL
(2)
1 kΩ
S1
S2
VCC
1. The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns.
2. CL includes probe and stray capacitance
Figure 16. Receiver enable and disable times waveform (test 1)
IN
OUT
1.5 V
tPRZH
tPRSH
1.5 V
S1 open
S2 closed
S3 = 1.5 V
3 V
0 V
VOH
0 V
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
DS2947 - Rev 12 page 12/23
mfifih
Figure 17. Receiver enable and disable times waveform (test 2)
IN
OUT
1.5 V
S1 closed
S2 open
S3 = -1.5 V
tPRZL
tPRSL
1.5 V
3 V
0 V
VCC
VOL
Figure 18. Receiver enable and disable times waveform (test 3)
IN
OUT
1.5 V
tPRHZ
VOH - 0.25 V
S1 open
S2 closed
S3 = 1.5 V
3 V
0 V
VOH
0 V
Figure 19. Receiver enable and disable times waveform (test 4)
IN
OUT
1.5 V
tPRLZ
0.25 V
S1 closed
S2 open
S3 = -1.5 V
3 V
0 V
VCC
VOL
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
DS2947 - Rev 12 page 13/23
lm.(mA) Von (v) —2‘5zo —2.515 4.5.30 71.5.55 454!) —2.545 —2.550 4.555 -1.5sn —2‘5ss Mm) u.5 Val 00 Vac (V) v... (V) Van (V) 2525 2520 2‘51 5 251 a 2505 1500 1495 use -7 —5 I s s Voc (v) Iasnw D.flfl -u.u1 41m -0.06 —0.05 —u.1u 41.12 -mu -1 -5 I 5 9 V0 (v)
Figure 20. Receiver output current vs. output low voltage
25
20
15
10
5
Figure 21. Receiver output current vs. output high voltage
0.0
-2
IOH(mA)
-4
-6
-8
-10
-12
-14
-16
-18
-20
Vcc=3.3 V
Ta = 25°C
-4
-3.5
-3
-2.5 -2 -1.5 -1
VOH(V)
Figure 22. Low level driver output capability Figure 23. High level driver output capability
Figure 24. Receiver input characteristics
0.3
0.2
0.1
-0.1
-0.2
0
Figure 25. Driver short-circuit current (test 1)
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
DS2947 - Rev 12 page 14/23
w (v)
Figure 26. Driver short-circuit current (test 2)
IOSD (mA)
140
120
100
80
60
40
20
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
DS2947 - Rev 12 page 15/23
1n- fiLfl‘rjfl’ Afi D a a
6Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages,
depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product
status are available at: www.st.com. ECOPACK is an ST trademark.
6.1 SO8 package information
Figure 27. SO8 package outline
Table 11. SO8 package mechanical data
Ref.
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A1.75 0.069
A1 0.10 0.25 0.004 0.010
A2 1.25 0.049
b 0.28 0.48 0.011 0.019
c 0.17 0.23 0.007 0.010
D 4.80 4.90 5.00 0.189 0.193 0.197
E 5.80 6.00 6.20 0.228 0.236 0.244
E1 3.80 3.90 4.00 0.150 0.154 0.157
e 1.27 0.050
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
L1 1.04 0.040
k 8° 0°
ccc 0.10 0.004
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Package information
DS2947 - Rev 12 page 16/23
6.2 SO8 packing information
Figure 28. SO8 tape and reel outline
1. Drawing not to scale
Table 12. SO8 tape and reel mechanical data
Symbol
Dimensions
mm Inches
Min. Typ. Max. Min. Typ. Max.
A
330
12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 2.362
T 22.4 0.882
Ao 8.1 8.5 0.319 0.335
Bo 5.5 5.9 0.216 0.232
Ko 2.1 2.3 0.082 0.090
Po 3.9 4.1 0.153 0.161
P 7.9 8.1 0.311 0.319
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
SO8 packing information
DS2947 - Rev 12 page 17/23
7Ordering information
Table 13. Order codes
Order code Temperature range Package Packing Marking
ST3485ECDR 0 to 70 °C
SO8 2500 parts per reel
3485EC
ST3485EBDR -40 to 85 °C 3485EB
ST3485EIDT -40 to 125 °C 3485EI
ST3485EIYDT(1) -40 to 125 °C (automotive grade) 3485EIY
1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening
according to AEC Q001 and Q 002 or equivalent.
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Ordering information
DS2947 - Rev 12 page 18/23
Revision history
Table 14. Document revision history
Date Revision Changes
20-Jun-2005 2 Mistake on table 12 tZL(SHDN) ms ==> µs.
30-Aug-2005 3 Remove (TRUE) on title, description has been updated in cover page. The VTH and
DVTH values are changed in table 10.
07-Apr-2006 4 Order codes updated.
12-Nov-2007 5 Added Table 1.
18-Dec-2013 6
Updated Features (added SO-8 package, replaced human body model by ±15 kV IEC
61000-4-2 air discharge and IEC 1000-4-2 by IEC 61000-4-2).
Updated Description (renamed device to ST3485EB/EC, replaced human body model
by ±15 kV IEC 61000-4-2 air discharge).
Removed ST3485ECN device from Table 1.
Updated title of Table 6, cross-references, replaced human body model (HBM) by ±15
kV IEC 61000-4-2 air discharge and IEC 1000-4-2 by IEC 61000-4-2.
Added notes below Table 9.
Updated Table 10 to Table 12 (updated data, cross-references).
Updated Figure 5 to Figure 16 (updated data, added notes below figures and
highlighted some parts of Figure 6 and Figure 12).
Removed DIP-8 package from Section 6: "Package information" and whole document.
Reformatted Section 6: "Package information" (added Figure 27, Figure 28, Table 13
and Table 14, reversed order of figures and table).
Minor corrections throughout document.
12-Jun-2015 7
Added part number ST3485EIY
Added order code ST3485EIYDT and pointed out in Features it is automotive grade.
Table 7 and Table 9 through to Table 12: replaced TA = -40 to 85 °C with TA = 0 to
70 °C (ST3485ECDR), TA = -40 to 85 °C (ST3485EBDR), and TA = -40 to 125 °C
(ST3485EIYDT).
Updated titles of figures 7, 8, 11, 12, 16, 17, 18, 19, 25, and 26
15-Mar-2016 8
Table 5: added ESD information
Removed "Table 6: ESD performance: transmitter outputs, receiver inputs (A, B)".
Added Section 7: "Ordering information"
02-Aug-2016 9
Added new part number ST3485EI
Table 1: "Device summary": added information for new part number ST3485EI.
Removed " Note " icons throughout datasheet
Section 4: "Electrical characteristics": updated TA information
Section 5: "Test circuits and typical characteristics": removed overline bar concerning
"RE is low" in note 1 of figures 8 and 12.
Table 14: "Order codes": added ST3485EIDT and updated footnote 1 (ST3485EIYDT
now qualified).
25-Aug-2016 10 Table 14: "Order codes": updated order codes ST3485EBDR and ST3485ECDR.
26-Oct-2017 11
Updated Figure 20: "Receiver output current vs. output low voltage", Figure 21:
"Receiver output current vs. output high voltage", Figure 24: "Receiver input
characteristics" and Figure 26: "Driver short-circuit current (test 2)".
05-Mar-2021 12 Updated Table 4. Absolute maximum ratings.
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
DS2947 - Rev 12 page 19/23
Contents
1Pin configuration ..................................................................2
2Truth tables........................................................................3
3Maximum ratings ..................................................................4
4Electrical characteristics...........................................................5
5Test circuits and typical characteristics ............................................8
6Package information..............................................................16
6.1 SO8 package information.......................................................16
6.2 SO8 tape and reel information...................................................17
7Ordering information .............................................................18
Revision history .......................................................................19
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Contents
DS2947 - Rev 12 page 20/23
List of figures
Figure 1. Pin connections ...................................................................2
Figure 2. Driver and VOC test load .............................................................8
Figure 3. Driver VOD with varying common mode voltage test load .......................................8
Figure 4. Receiver VOH and VOL test circuit .......................................................8
Figure 5. Drive differential output delay transition time test circuit ........................................8
Figure 6. Drive differential output delay transition time waveform ........................................9
Figure 7. Drive enable and disable times test circuit (pull-down configuration) ...............................9
Figure 8. Drive enable and disable times waveforms (pull-down configuration) ...............................9
Figure 9. Drive propagation time test circuit ...................................................... 10
Figure 10. Drive propagation time waveform ...................................................... 10
Figure 11. Drive enable and disable times test circuit (pull-up configuration) ................................ 10
Figure 12. Drive enable and disable times waveforms (pull-up configuration) ................................ 11
Figure 13. Receiver propagation delay time test circuit ............................................... 11
Figure 14. Receiver propagation delay time waveforms............................................... 12
Figure 15. Receiver enable and disable times test circuit.............................................. 12
Figure 16. Receiver enable and disable times waveform (test 1)......................................... 12
Figure 17. Receiver enable and disable times waveform (test 2)......................................... 13
Figure 18. Receiver enable and disable times waveform (test 3)......................................... 13
Figure 19. Receiver enable and disable times waveform (test 4)......................................... 13
Figure 20. Receiver output current vs. output low voltage ............................................. 14
Figure 21. Receiver output current vs. output high voltage............................................. 14
Figure 22. Low level driver output capability....................................................... 14
Figure 23. High level driver output capability ...................................................... 14
Figure 24. Receiver input characteristics ......................................................... 14
Figure 25. Driver short-circuit current (test 1) ...................................................... 14
Figure 26. Driver short-circuit current (test 2) ...................................................... 15
Figure 27. SO8 package outline ............................................................... 16
Figure 28. SO8 tape and reel outline ........................................................... 17
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
List of figures
DS2947 - Rev 12 page 21/23
List of tables
Table 1. Pin description......................................................................2
Table 2. Truth table (driver) ...................................................................3
Table 3. Truth table (receiver) .................................................................3
Table 4. Absolute maximum ratings .............................................................4
Table 5. Electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for the
ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical
values are referred to TA = 25 °C) ........................................................5
Table 6. Logic input electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for the
ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical
values are referred to TA = 25 °C) ........................................................5
Table 7. Transmitter electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for the
ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical
values are referred to TA = 25 °C) ........................................................5
Table 8. Receiver electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for
ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values
are referred to TA = 25 °C) .............................................................6
Table 9. Driver switching characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for the ST3485ECDR, TA = -40 to 85 °C for the
ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical
values are referred to TA = 25 °C) ........................................................6
Table 10. Receiver switching characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for
ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values
are referred to TA = 25 °C) .............................................................7
Table 11. SO8 package mechanical data ......................................................... 16
Table 12. SO8 tape and reel mechanical data ...................................................... 17
Table 13. Order codes ...................................................................... 18
Table 14. Document revision history ............................................................. 19
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
List of tables
DS2947 - Rev 12 page 22/23
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ST3485EB, ST3485EC, ST3485EI, ST3485EIY
DS2947 - Rev 12 page 23/23

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