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ST485B/C Datasheet

STMicroelectronics

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Datasheet

February 2009 Rev 16 1/19
19
ST485B
ST485C
Low power RS-485/RS-422 transceiver
Features
Low quiescent current: 300 µA
Designed for RS-485 interface application
- 7 V to 12 V common mode input voltage range
Driver maintains high impedance in 3-state or
with the power OFF
70 mV typical input hysteresis
30 ns propagation delay, 5 ns skew
Operate from a single 5 V supply
Current limiting and thermal shutdown for
driver overload protection
Allows up to 64 transceivers on the bus
Description
The ST485 is al low power transceiver for RS-485
and RS-422 communication. Each part contains
one driver and one receiver.
This transceiver draw 300 µA (typ.) of supply
current when unloaded or fully loaded with
disabled drivers.
It operates from a single 5 V supply.
Driver is short-circuit current limited and is
protected against excessive power dissipation by
thermal shutdown circuitry that placed the driver
outputs into a high-impedance state.
The ST485 is designed for bi-directional data
communications on multipoint bus transmission
line (half-duplex applications).
The ST485 is available in three temperature
range: commercial (0 °C to 70 °C), industrial (- 40
°C to 85 °C) and automotive (- 55 °C to 125 °C).
DIP-8 SO-8
Table 1. Device summary
Order code Temperature range Package Packaging
ST485CN 0 to 70 °C DIP-8 50 parts per tube / 40 tube per box
ST485BN - 40 to 85 °C DIP-8 50 parts per tube / 40 tube per box
ST485CDR 0 to 70 °C SO-8 (tape and reel) 2500 parts per reel
ST485BDR - 40 to 85 °C SO-8 (tape and reel) 2500 parts per reel
www.st.com
Contents ST485B - ST485C
2/19
Contents
1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Driver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Receiver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
ST485B - ST485C Pin configuration
3/19
1 Pin configuration
Figure 1. Pin connections
Table 2. Pin description
Pin n° Symbol Name and function
1 RO Receiver output
2 RE Receiver output enable
3 DE Driver output enable
4DIDriver input
5 GND Ground
6 A Non-inverting receiver input and non-inverting driver output
7 B Inverting receiver input and inverting driver output
8V
CC Supply voltage
Truth tables ST485B - ST485C
4/19
2 Truth tables
Note: X = Don’t care; Z = High impedance
Note: X = Don’t care; Z = High impedance
Table 3. Truth table (driver)
Inputs Outputs
RE DE DI B A
XHHLH
XHLHL
XLXZZ
Table 4. Truth table (receiver)
Inputs Outputs
RE DE A-B RO
LL
+0.2V H
LL
-0.2V L
L L Inputs open H
HLX Z
ST485B - ST485C Maximum ratings
5/19
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 5. Absolute maximum ratings
Symbol Parameter Value Unit
VCC Supply voltage 7 V
VIControl input voltage (RE, DE) -0.5 to (VCC + 0.5) V
VDI Driver input voltage (DI) -0.5 to (VCC + 0.5) V
VDO Driver output voltage (A, B) ± 14 V
VRI Receiver input voltage (A, B) ± 14 V
VRO Receiver output voltage (RO) -0.5 to (VCC + 0.5) V
Electrical characteristics ST485B - ST485C
6/19
4 Electrical characteristics
VCC = 5 V ± 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred
to TA = 25 °C
Table 6. DC electrical characteristics
Symbol Parameter Test conditions (1)
Value
Unit-40 to 85 °C -55 to 125 °C
Min. Typ. Max. Min. Max.
VOD1
Differential driver output
(no load) 55V
VOD2
Differential driver output
(with load)
RL = 27Ω (RS-485) Figure 2
RL = 50Ω (RS-422) Figure 2 1.5 5
51.4 5
5
V
V
ΔVOD
Change in magnitude of
driver differential output
voltage for complementary
output states
RL = 27Ω or 50Ω Figure 2 0.2 0.2 V
VOC
Driver common-mode
output voltage RL = 27Ω or 50Ω Figure 2 33V
ΔVOC
Change in magnitude of
driver common-mode
output voltage for
complementary output
states
RL = 27Ω or 50Ω Figure 2 0.2 0.2 V
VIH Input high voltage RE, DE, DI 2.0 2.0 V
VIL Input low voltage RE, DE, DI 0.8 0.8 V
IIN1 Input current RE, DE, DI ± 2± A
IIN2 Input current (A, B)
VCM = 0V or 5.25V, VDE = 0V
VIN = 12V
VIN = -7V
1
-0.8
1
-0.8
mA
mA
VTH
Receiver differential
threshold voltage VCM = -7 to 12V -0.2 0.2 -0.2 0.2 V
ΔVTH Receiver input hysteresis VCM = 0V 70 mV
VOH
Receiver output high
voltage IO = -4mA, VID = 200mV 3.5 3.4 V
VOL
Receiver output low
voltage IO = 4mA, VID = -200mV 0.4 0.55 V
IOZR
3-state (high impedance)
output current at receiver VO = 0.4 to 2.4V ± 1± A
RIN Receiver input resistance VCM = -7 to 12V 24 24 kΩ
ICC No load supply current (2)
VRE = 0V or VCC
VDE = VCC
VDE = 0V
400
300
900
500
900
500
µA
µA
ST485B - ST485C Electrical characteristics
7/19
VCC = 5 V ± 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred
to TA = 25 °C
IOSD1
Driver short-circuit
current, VO=High VO = -7 to 12V (3) 35 25035250mA
IOSD2
Driver short-circuit
current, VO=Low VO = -7 to 12V (3) 35 25035250mA
IOSR
Receiver short-circuit
current VO = 0V to VCC 7 95795mA
1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device
ground unless specified.
2. Supply current specification is valid for loaded transmitters when VDE = 0V
3. Applies to peak current. See typical Operating Characteristics.
Table 6. DC electrical characteristics (continued)
Symbol Parameter Test conditions (1)
Value
Unit-40 to 85 °C -55 to 125 °C
Min. Typ. Max. Min. Max.
Table 7. Driver switching characteristics
Symbol Parameter Test conditions (1)
Value
Unit-40 to 85 °C -55 to 125°C
Min. Typ. Max. Min. Max.
tPLH
tPHL
Propagation delay
input to output
RDIFF = 54Ω, CL1 = CL2 = 100pF
(See Figure 4 and Figure 6)10 30 60 70 ns
tSK Output skew to output RDIFF = 54Ω, CL1 = CL2 = 100pF
(See Figure 4 and Figure 6)510 10ns
tTLH
tTHL
Rise or fall time RDIFF = 54Ω, CL1 = CL2 = 100pF
(See Figure 4 and Figure 6)3 15 40 3 45 ns
tPZH Output enable time CL = 100pF, S2 = Closed
(See Figure 5 and Figure 7)70 90 90 ns
tPZL Output enable time CL = 100pF, S1 = Closed
(See Figure 5 and Figure 7)70 90 90 ns
tPLZ Output disable time CL = 15pF, S1 = Closed
(See Figure 5 and Figure 7)70 90 90 ns
tPHZ Output disable time CL = 15pF, S2 = Closed
(See Figure 5 and Figure 7)70 90 90 ns
1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device
ground unless specified.
Electrical characteristics ST485B - ST485C
8/19
VCC = 5 V ± 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred
to TA = 25 °C
Table 8. Receiver switching characteristics
Symbol Parameter Test conditions (1)
Value
Unit-40 to 85 °C -55 to 125°C
Min. Typ. Max. Min. Max.
tPLH
tPHL
Propagation delay input
to output
RDIFF=54Ω, CL1 = CL2 = 100pF
(See Figure 4 and Figure 8)20 130 210 230 ns
tSKD
Differential receiver
skew
RDIFF=54Ω, CL1 = CL2 = 100pF
(See Figure 4 and Figure 8)13 ns
tPZH Output enable time CRL = 15pF, S1 = Closed
(See Fig. 2 and Figure 9)20 50 56 ns
tPZL Output enable time CRL = 15pF, S2 = Closed
(See Fig. 2 and Figure 9)20 50 56 ns
tPLZ Output disable time CRL = 15pF, S1 = Closed
(See Fig. 2 and Figure 9)20 50 56 ns
tPHZ Output disable time CRL = 15pF, S2 = Closed
(See Fig. 2 and Figure 9)20 50 56 ns
fMAX Maximum data rate 2.5 2.5 Mbps
1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device
ground unless specified
ST485B - ST485C Test circuit and typical characteristics
9/19
5 Test circuit and typical characteristics
Figure 2. Driver DC test load Figure 3. Receiver timing test load
Figure 4. Drive/receiver timing test circuit Figure 5. Driver timing test load
Test circuit and typical characteristics ST485B - ST485C
10/19
Figure 6. Driver propagation delay
Figure 7. Driver enable and disable time
ST485B - ST485C Test circuit and typical characteristics
11/19
Figure 8. Receiver propagation delay
Figure 9. Receiver enable and disable time
Test circuit and typical characteristics ST485B - ST485C
12/19
Figure 10. Receiver output current vs. output
low voltage
Figure 11. Receiver output current vs. output
high voltage
Figure 12. Driver output current vs. output low
voltage
Figure 13. Driver output current vs. output
high voltage
Figure 14. Supply current vs. temperature Figure 15. Receiver high level output voltage
vs. temperature
ST485B - ST485C Test circuit and typical characteristics
13/19
Figure 16. Receiver low level output voltage
vs. temperature
Figure 17. Differential driver output voltage vs.
temperature
Package mechanical data ST485B - ST485C
14/19
6 Package mechanical data
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.
ST485B - ST485C Package mechanical data
15/19
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A3.30.130
a1 0.7 0.028
B1.39 1.65 0.055 0.065
B1 0.91 1.04 0.036 0.041
b0.5 0.020
b1 0.38 0.5 0.015 0.020
D9.80.386
E8.80.346
e 2.54 0.100
e37.62 0.300
e4 7.62 0.300
F 7.1 0.280
I4.80.189
L3.30.130
Z 0.44 1.6 0.017 0.063
Plastic DIP-8 mechanical data
P001F
Package mechanical data ST485B - ST485C
16/19
Dim. mm. inch.
Min. Typ. Max. Min. Typ. Max.
A1.35 1.75 0.0530.069
A1 0.10 0.25 0.04 0.010
A2 1.10 1.65 0.0430.065
B0.33 0.51 0.0130.020
C0.190.25 0.007 0.010
D4.80 5.00 0.189 0.197
E3.80 4.00 0.150 0.157
e 1.27 0.050
H5.80 6.20 0.2280.244
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
k8° (max.)
ddd 0.1 0.04
SO-8 mechanical data
0016023/C
ST485B - ST485C Package mechanical data
17/19
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A330 12.992
C 12.813.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 0.882
Ao 8.1 8.5 0.3190.335
Bo 5.5 5.90.216 0.232
Ko 2.1 2.30.082 0.090
Po 3.94.1 0.1530.161
P7.98.1 0.311 0.319
Tape & reel SO-8 mechanical data
Revision history ST485B - ST485C
18/19
7 Revision history
Table 9. Document revision history
Date Revision Changes
21-Mar-2006 12 Order codes has been updated and new template.
02-Aug-2006 13 Mistake in cover page first row mA ==> µA.
08-Nov-2006 14 Added: Ta b le 1 .
07-Feb-2008 15 Modified: Table 1 on page 1.
16-Feb-2009 16 Modified Note: on page 5.
ST485B - ST485C
19/19
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