STMICROELECTRONICS ST485ECDR

ST485E
±15KV ESD PROTECTED, LOW POWER
RS-485/RS-422 TRANSCEIVER
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LOW QUIESCENT CURRENT: 300µA
DESIGNED FOR RS-485 INTERFACE
APPLICATIONS
-7V TO 12V COMMON MODE INPUT
VOLTAGE RANGE
DRIVER MAINTAINS HIGH IMPEDANCE IN
3-STATE OR WITH THE POWER OFF
70mV TYPICAL INPUT HYSTERESIS
30ns PROPAGATION DELAYS, 5ns SKEW
OPERATE FROM A SINGLE 5V SUPPLY
CURRENT LIMITING AND THERMAL
SHUTDOWN FOR DRIVER OVERLOAD
PROTECTION
ESD PROTECTION:
±15KV (H.B.M.)
±8KV (IEC-1000-4-2 CONTACT
DISCHARGE)
ALLOWS UP TO 64 TRANSCEIVERS ON
THE BUS
DESCRIPTION
The ST485E is al low power transceiver for
RS-485 and RS-422 communication. Each driver
output and receiver input is protected against
±15KV electrostatic discharge (H.B.M.) (ESD)
shocks, without latcup. These parts contain one
DIP
SOP
driver and one receiver in half duplex
configuration.
This transceiver draw 300µA (typ.) of supply
current when unloaded or fully loaded with
disabled drivers.
It operates from a single 5V 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
line (half-duplex applications).
ORDERING CODES
Type
Temperature
Range
Package
Comments
ST485ECN
ST485EBN
ST485EXN
ST485ECD
ST485EBD
ST485EXD
ST485ECDR
ST485EBDR
ST485EXDR
0 to 70 °C
-40 to 85 °C
-55 to 125 °C
0 to 70 °C
-40 to 85 °C
-55 to 125 °C
0 to 70 °C
-40 to 85 °C
-55 to 125 °C
DIP-8
DIP-8
DIP-8
SO-8 (Tube)
SO-8 (Tube)
SO-8 (Tube)
SO-8 (Tape & Reel)
SO-8 (Tape & Reel)
SO-8 (Tape & Reel)
50parts per tube / 40tube per box
50parts per tube / 40tube per box
50parts per tube / 40tube per box
100parts per tube / 20tube per box
100parts per tube / 20tube per box
100parts per tube / 20tube per box
2500 parts per reel
2500 parts per reel
2500 parts per reel
September 2003
1/13
ST485E
PIN CONFIGURATION
PIN DESCRIPTION
PlN N°
SYMBOL
1
2
3
4
5
6
7
RO
RE
DE
DI
GND
A
B
VCC
8
NAME AND FUNCTION
Receiver Output
Receiver Output Enable
Driver Output Enable
Driver Input
Ground
Non-inverting Receiver Input and Non-inverting Driver Output
Inverting Receiver Input and Inverting Driver Output
Supply Voltage
TRUTH TABLE (RECEIVER)
TRUTH TABLE (DRIVER)
INPUTS
OUTPUTS
INPUTS
OUTPUT
RE
DE
DI
B
A
RE
DE
A-B
RO
X
X
X
H
H
L
H
L
X
L
H
Z
H
L
Z
L
L
L
H
L
L
L
L
≥ +0.2V
≤ -0.2V
INPUTS OPEN
X
H
L
H
Z
X= Don’t Care; Z=High Impedance
X= Don’t Care; Z=High Impedance
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Parameter
Supply Voltage
Value
Unit
7
V
Control 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
VI
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
2/13
ST485E
ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS
Symbol
ESD
ESD
Parameter
ESD Protection Voltage
ESD Protection Voltage
Test Conditions
Min.
Typ.
Max.
±15
±8
Human Body Model
IEC-1000-4-2
Unit
KV
KV
DC ELECTRICAL CHARACTERISTICS
(VCC = 5V ± 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25°C)
(See Note 1)
Symbol
VOD1
VOD2
∆VOD
Parameter
Differential Driver Output
(No Load)
Differential Driver Output
(With Load)
VIH
Change in Magnitude of
Driver Differential Output
Voltage for Complementary
Output States
Driver Common-Mode
Output Voltage
Change in Magnitude of
Driver Common-Mode
Output Voltage for
Complementary Output
States
Input High Voltage
VOC
∆VOC
Test Conditions
Max.
Unit
5
V
5
5
V
V
RL = 27Ω or 50Ω (See Fig. 1)
0.2
V
RL = 27Ω or 50Ω (See Fig. 1)
3
V
RL = 27Ω or 50Ω (See Fig. 1)
0.2
V
RL = 27Ω (RS-485) (See Fig. 1)
RL = 50Ω (RS-422) (See Fig. 1)
RE, DE, DI
Min.
Typ.
1.5
2.0
V
VIL
Input Low Voltage
RE, DE, DI
0.8
V
IIN1
Input Current
RE, DE, DI
±2
µA
IIN2
Input Current (A, B)
VCM = 0V or 5.25V
VIN = 12V
VIN = -7V
1
-0.8
mA
mA
0.2
V
VTH
∆VTH
VOH
VOL
IOZR
RIN
ICC
VDE = 0V
Receiver Differential
Threshold Voltage
Receiver Input Hysteresis
VCM = -7 to 12V
Receiver Output High
Voltage
Receiver Output Low
Voltage
3-State (High Impedance)
Output Current at Receiver
Receiver Input Resistance
IO = -4mA
VID = 200mV
IO = 4mA
VID = -200mV
No Load Supply Current
(Note 2)
VRE = 0V or VCC
VDE = VCC
VDE = 0V
-0.2
VCM = 0V
70
V
VO = 0.4 to 2.4V
VCM = -7 to 12V
mV
3.5
0.4
V
±1
µA
24
KΩ
400
300
900
500
µA
µA
IOSD1
Driver Short-Circuit Current, VO = -7 to 12V (Note 3)
VO=High
35
250
mA
IOSD2
Driver Short-Circuit Current, VO = -7 to 12V (Note 3)
VO=Low
35
250
mA
IOSR
Receiver Short-Circuit
Current
7
95
mA
VO = 0V to VCC
Note 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.
Note 2: Supply current specification is valid for loaded transmitters when VDE = 0V
Note 3: Applies to peak current. See typical Operating Characteristics.
3/13
ST485E
DRIVER SWITCHING CHARACTERISTICS
(VCC = 5V ± 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25°C)
(See Note 1)
Symbol
Parameter
Typ.
Max.
Unit
CL1 = CL2 = 100pF
25
45
ns
Output Skew to Output
(See Fig. 3 and 5)
RDIFF = 54Ω
CL1 = CL2 = 100pF
2
5
ns
tTLH
tTHL
Rise or Fall Time
(See Fig. 3 and 5)
RDIFF = 54Ω
CL1 = CL2 = 100pF
15
40
ns
tPZH
Output Enable Time
S2 = Closed
35
50
ns
S1 = Closed
25
40
ns
S1 = Closed
25
40
ns
S2 = Closed
35
50
ns
tPLH
tPHL
Propagation Delay Input to
Output
tSK
tPZL
tPLZ
tPHZ
Output Enable Time
Output Disable Time
Output Disable Time
Test Conditions
RDIFF = 54Ω
(See Fig. 3 and
CL = 100pF
(See Fig. 4 and
CL = 100pF
(See Fig. 4 and
CL = 15pF
(See Fig. 4 and
CL = 15pF
(See Fig. 4 and
Min.
5)
6)
6)
6)
6)
Note 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.
RECEIVER SWITCHING CHARACTERISTICS
(VCC = 5V ± 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25°C)
(See Note 1)
Symbol
Parameter
Test Conditions
Typ.
Max.
Unit
110
130
ns
CL1 = CL2 = 100pF
5
10
ns
S2 = Closed
11
35
ns
S1 = Closed
13
35
ns
S1 = Closed
13
35
ns
S2 = Closed
11
35
ns
tPLH
tPHL
Propagation Delay Input to
Output
RDIFF = 54Ω
CL1 = CL2 = 100pF
(See Fig. 3 and 7)
tSKD
Differential Receiver Skew
RDIFF = 54Ω
(See Fig. 3 and
CRL = 15pF
(See Fig. 2 and
CRL = 15pF
(See Fig. 2 and
CRL = 15pF
(See Fig. 2 and
CRL = 15pF
(See Fig. 2 and
tPZH
tPZL
tPLZ
tPHZ
fMAX
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
Maximum Data Rate
Min.
7)
8)
8)
8)
8)
5
Mbps
Note 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.
4/13
ST485E
TEST CIRCUITS AND TYPICAL CHARACTERISTICS
Figure 1 : Driver DC Test Load
Figure 3 : Drive/Receiver Timing Test Circuit
Figure 2 : Receiver Timing Test Load
Figure 4 : Driver Timing Test Load
5/13
ST485E
Figure 5 : Driver Propagation Delay
Figure 6 : Driver Enable and Disable Time
6/13
ST485E
Figure 7 : Receiver Propagation Delay
Figure 8 : Receiver Enable and Disable Time
7/13
ST485E
Figure 9 : Receiver Output Current vs Output
Low Voltage
Figure 12 : Driver Output Current vs Output High
Voltage
Figure 10 : Receiver Output Current vs Output
High Voltage
Figure 13 : Supply Current vs Temperature
Figure 11 : Driver Output Current vs Output Low
Voltage
Figure 14 : Receiver High Level Output Voltage
vs Temperature
8/13
ST485E
Figure 15 : Receiver Low Level Output Voltage
vs Temperature
Figure 16 : Differential Driver Output Voltage vs
Temperature
9/13
ST485E
Plastic DIP-8 MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
TYP
MAX.
MIN.
3.3
TYP.
MAX.
0.130
a1
0.7
B
1.39
1.65
0.055
0.065
B1
0.91
1.04
0.036
0.041
b
b1
0.028
0.5
0.38
0.020
0.5
D
0.015
0.020
9.8
0.386
E
8.8
0.346
e
2.54
0.100
e3
7.62
0.300
e4
7.62
0.300
F
7.1
0.280
I
4.8
0.189
L
Z
3.3
0.44
0.130
1.6
0.017
0.063
P001F
10/13
ST485E
SO-8 MECHANICAL DATA
DIM.
mm.
MIN.
TYP
inch
MAX.
MIN.
TYP.
MAX.
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.04
0.010
A2
1.10
1.65
0.043
0.065
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.007
0.010
D
4.80
5.00
0.189
0.197
E
3.80
4.00
0.150
0.157
e
1.27
0.050
H
5.80
6.20
0.228
0.244
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
k
ddd
8˚ (max.)
0.1
0.04
0016023/C
11/13
ST485E
Tape & Reel SO-8 MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
MAX.
MIN.
330
13.2
TYP.
MAX.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
12/13
TYP
0.504
22.4
0.519
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
ST485E
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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© 2003 STMicroelectronics - All Rights Reserved
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