Fiche technique pour ST485Ex de STMicroelectronics

February 2009 Rev 14 1/18
18
ST485EB
ST485EC - ST485EX
±15 kV ESD protected, 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
■Operates from a single 5 V supply
■Current limiting and thermal shutdown for
driver overload protection
■ESD protection:
– ± 15 kV (HBM)
– ± 8 kV (IEC-1000-4-2 contact discharge)
■Allows up to 256 transceivers on the bus
Description
The ST485E is a low power transceiver for RS-
485 and RS-422 communication. Each driver
output and receiver input is protected against
± 15 kV electrostatic discharge (HBM) (ESD)
shocks, without latch-up. These parts contain one
driver and one receiver in half duplex
configuration.
This transceiver draws 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 place the driver
outputs into a high-impedance state.
The ST485E is designed for bi-directional data
communications on multipoint bus transmission
lines (half-duplex applications).
SO-8
Table 1. Device summary
Order codes Temperature
range Package Packaging
ST485EBD - 40 to 85 °C SO-8 (tube) 100 parts per tube / 20 tube per box
ST485ECDR 0 to 70 °C SO-8 (tape and reel) 2500 parts per reel
ST485EBDR - 40 to 85 °C SO-8 (tape and reel) 2500 parts per reel
ST485EXDR - 55 to 125 °C SO-8 (tape and reel) 2500 parts per reel
www.st.com
Contents ST485EB - ST485EC - ST485EX
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Contents
1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
]8 Vm J78 16A ]5 GND csoog7n
ST485EB - ST485EC - ST485EX Pin configuration
3/18
1 Pin configuration
Figure 1. Pin connections (top view)
Table 2. Pin description
Pin n° Symbol Name and function
1 RO Receiver output
2REReceiver output enable
3 DE Driver output enable
4 DI Driver 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 ST485EB - ST485EC - ST485EX
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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
ST485EB - ST485EC - ST485EX Maximum ratings
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3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these 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 ST485EB - ST485EC - ST485EX
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4 Electrical characteristics
VCC = 5 V ± 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred
to TA = 25 °C
Table 6. ESD performance: transmitter outputs, receiver inputs
Symbol Parameter Test conditions Min. Typ. Max. Unit
ESD ESD protection voltage Human body model ±15 kV
ESD ESD protection voltage IEC-1000-4-2 ±8kV
Table 7. DC electrical characteristics
Symbol Parameter Test conditions (1) Min. Typ. Max. Unit
VOD1
Differential driver output (no
load) 5V
VOD2
Differential driver output
(with load)
RL = 27 Ω (RS-485) (Figure 2)
RL = 50 Ω (RS-422) (Figure 2.)1.5 5
5
V
V
ΔVOD
Change in magnitude of
driver differential output
voltage for complementary
output states
RL = 27 Ω or 50 Ω (Figure 2)0.2V
VOC
Driver common-mode output
voltage RL = 27 Ω or 50 Ω (Figure 2)3V
ΔVOC
Change in magnitude of
driver common-mode output
voltage for complementary
output states
RL = 27 Ω or 50 Ω (Figure 2)0.2V
VIH Input high voltage RE, DE, DI 2.0 V
VIL Input low voltage RE, DE, DI 0.8 V
IIN1 Input current RE, DE, DI ± 2µA
IIN2 Input current (A, B)
VCM = 0 V or 5.25 V, VDE = 0 V
VIN = 12 V
VIN = -7 V
1
-0.8
mA
mA
VTH
Receiver differential
threshold voltage VCM = -7 to 12 V -0.2 0.2 V
ΔVTH Receiver input hysteresis VCM = 0 V 70 mV
VOH Receiver output high voltage IO = -4 mA, VID = 200 mV 3.5 V
VOL Receiver output low voltage IO = 4 mA, VID = -200 mV 0.4 V
IOZR
3-State (high impedance)
output current at receiver VO = 0.4 to 2.4 V ± 1µA
RIN Receiver input resistance VCM = -7 to 12 V 96 kΩ
ICC No load supply current (2)
VRE = 0V or VCC
VDE = VCC
VDE = 0 V
400
300
900
500
µA
µA
ST485EB - ST485EC - ST485EX Electrical characteristics
7/18
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 12 V (3) 35 250 mA
IOSD2
Driver short-circuit current,
VO=Low VO = -7 to 12 V (3) 35 250 mA
IOSR Receiver short-circuit current VO = 0 V to VCC 795mA
1. All currents into device pins are positive; all 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 = 0 V
3. Applies to peak current. See typical Operating Characteristics.
Table 7. DC electrical characteristics (continued)
Symbol Parameter Test conditions (1) Min. Typ. Max. Unit
Table 8. Driver switching characteristics
Symbol Parameter Test conditions (1) Min. Typ. Max. Unit
tPLH
tPHL
Propagation delay input to
output
RDIFF = 54 Ω, CL1 = CL2 = 100 pF
(See Figure 4 and Figure 6) 25 45 ns
tSK Output skew to output RDIFF = 54 Ω, CL1 = CL2 = 100 pF
(See Figure 4 and Figure 6)25ns
tTLH
tTHL
Rise or fall time RDIFF = 54 Ω, CL1 = CL2 = 100 pF
(See Figure 4 and Figure 6) 15 40 ns
tPZH Output enable time CL = 100 pF, S2 = Closed
(See Figure 5 and Figure 7)35 50 ns
tPZL Output enable time CL = 100 pF, S1 = Closed
(See Figure 5 and Figure 7)25 40 ns
tPLZ Output disable time CL = 15 pF, S1 = Closed
(See Figure 5 and Figure 7)25 40 ns
tPHZ Output disable time CL = 15 pF, S2 = Closed
(See Figure 5 and Figure 7)35 50 ns
1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground
unless specified.
Electrical characteristics ST485EB - ST485EC - ST485EX
8/18
VCC = 5 V ± 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred
to TA = 25 °C
Table 9. Receiver switching characteristics
Symbol Parameter Test conditions (1) Min. Typ. Max. Unit
tPLH
tPHL
Propagation delay input to
output
RDIFF = 54 Ω, CL1 = CL2 = 100 pF
(See Figure 4 and Figure 8)110 130 ns
tSKD Differential receiver skew RDIFF = 54 Ω, CL1 = CL2 = 100 pF
(See Figure 4 and Figure 8)510ns
tPZH Output enable time CRL = 15 pF, S1 = Closed
(See Figure 2 and Figure 9)11 35 ns
tPZL Output enable time CRL = 15 pF, S2 = Closed
(See Figure 2 and Figure 9)13 35 ns
tPLZ Output disable time CRL = 15 pF, S1 = Closed
(See Figure 2 and Figure 9)13 35 ns
tPHZ Output disable time CRL = 15 pF, S2 = Closed
(See Figure 2 and Figure 9)11 35 ns
fMAX Maximum data rate 5 Mbps
1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground
unless specified
csolo4o csnrnin iming test circuit Figure 5. Driver liming lest load R:500fl I éé‘i csnrnsn 9/18
ST485EB - ST485EC - ST485EX Test circuit and typical characteristics
9/18
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
VmFFZVv—Vz Va VDIFF 0V ‘Vo csmom 3V DE 1.5V 1.5V GND t2” t ‘JHZ Vcc v0H —o.5v Y. Z 2.3V GND ’ZL ’Lz Vcc 2.3V X, Z v0L+o.5v GND 0500990
Test circuit and typical characteristics ST485EB - ST485EC - ST485EX
10/18
Figure 6. Driver propagation delay
Figure 7. Driver enable and disable time
csnluoo R0 R0 1‘5V 3V 1.5V 44444444444 GND 1.5V C vOH —0.5v GND 1,5V ‘Hz 'Lz vDL +0.5v GND Csoosao
ST485EB - ST485EC - ST485EX Test circuit and typical characteristics
11/18
Figure 8. Receiver propagation delay
Figure 9. Receiver enable and disable time
IDL(mA) ““5" Wm) csuww 25 75 20 -m 15 45 m -zo 5 715 00 I 2 3 4 5 Va(V) 4075 75 7A is 72 7| VD(V) Im(mA) csmm m0“) csmm mu -20 ‘60 -40 no 750 5a fan A0 -100 Do 1 2 3 A 5 VDL(V) 7‘2076 75 7A is 72 71vo(v) MM) 55mm VMV) csmmn A40 A.3 A20 A1 A00 4.1 sac m 560 3.9 540 5.5 510 3.7 —50 -25 D 25 50 75 ID“ DUO) 750 715 u 25 50 75 um DOC)
Test circuit and typical characteristics ST485EB - ST485EC - ST485EX
12/18
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
V0L(V) 0.40 0.35 0.30 0.25 0.20 0.45 0.40 —50 —25 0 25 50 75 csmlzo 400 TJ("C) Van“) 4.5 4.0 5.5 3.0 2.5 2.0 1.5 —50 No LOAD —25 u 25 50 75 csumu IDD HUG)
ST485EB - ST485EC - ST485EX Test circuit and typical characteristics
13/18
Figure 16. Receiver low level output voltage
vs. temperature
Figure 17. Differential driver output voltage vs.
temperature
Package mechanical data ST485EB - ST485EC - ST485EX
14/18
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.
SEAN; PLANE
ST485EB - ST485EC - ST485EX Package mechanical data
15/18
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
Po sofloc Kos; hmu \fl W E x \ Note Drawmg not m scale 16/18
Package mechanical data ST485EB - ST485EC - ST485EX
16/18
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
ST485EB - ST485EC - ST485EX Revision history
17/18
7 Revision history
Table 10. Document revision history
Date Revision Changes
21-Mar-2006 9 Order codes has been updated and new template.
05-Jun-2006 10 Change value row 10 on the features and RIN in Ta bl e 7 .
29-Jan-2007 11 Typo mistake on page 1.
29-Aug-2007 12 Change value RIN min. on Ta b l e 7 .
07-Feb-2008 13 Modified: Table 1 on page 1.
16-Feb-2009 14 Modified: Note: on page 5.
ST485EB - ST485EC - ST485EX
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