Page 1
SN55LBC175
QUADRUPLE LOW-POWER DIFFERENTIAL LINE RECEIVER
SGLS083 – MARCH 1995
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Meets EIA Standards RS-422-A, RS-423-A,
RS-485, and CCITT V.11
D
Designed to Operate With Pulse Durations
as Short as 20 ns
D
Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments
D
Input Sensitivity...±200 mV
D
Low-Power Consumption...20 mA Max
D
Open-Circuit Fail-Safe Design
D
Common-Mode Input Voltage Range of
–7 V to 12 V
description
The SN55LBC175 is a monolithic quadruple
differential line receiver with 3-state outputs and is
designed to meet the requirements of the EIA
Standards RS-422-A, RS-423-A, RS-485, and
CCITT V .1 1. This device is optimized for balanced
multipoint bus transmission at data rates up to and
exceeding 10 million bits per second. The
receivers are enabled in pairs with an active-high
enable input. Each differential receiver input
features high impedance, hysteresis for
increased noise immunity , and sensitivity of ±200
mV over a common-mode input voltage range of
12 V to –7 V. Fail-safe design ensures that if the
inputs are open circuited, the outputs are always
high. This device is designed using the Texas
Instruments proprietary LinBiCMOS technology
allowing low power consumption, high switching
speeds, and robustness.
This device offers optimum performance when used with the SN55LBC174 quadruple line driver. The
SN55LBC175 is available in the 16-pin CDIP (J) package, a 16-pin CP AK (W) package, or a 20-pin LCCC (FK)
package.
The SN55LBC175 is characterized over the military temperature range of –55°C to 125°C.
FUNCTION TABLE
(each receiver)
DIFFERENTIAL INPUTS
A–B
ENABLE
OUTPUT
Y
VID ≥ 0.2 V H H
–0.2 V < VID < 0.2 V H ?
VID ≤ –0.2 V H L
X L Z
Open circuit H H
H = high level, L = low level, X = irrelevant,
Z = high impedance (off), ? = indeterminate
Copyright 1995, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
LinBiCMOS is a trademark of Texas Instruments Incorporated.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1B
1A
1Y
1,2EN
2Y
2A
2B
GND
V
CC
4B
4A
4Y
3,4EN
3Y
3A
3B
J OR W PACKAGE
(TOP VIEW)
NC – No internal connection
FK PACKAGE
(TOP VIEW)
1920132
17
18
16
15
14
1312119 10
5
4
6
7
8
4A
4Y
NC
3,4EN
3Y
1Y
1,2EN
NC
2Y
2A
1A1BNC
4B
GND
NC
3B
3A
2B
V
CC
Page 2
SN55LBC175
QUADRUPLE LOW-POWER DIFFERENTIAL LINE RECEIVER
SGLS083 – MARCH 1995
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
2B
2A
1B
1A
1,2EN
2Y
1Y
5
3
7
6
1
2
4
EN
4B
4A
3B
3A
3,4EN
4Y
3Y
13
11
15
14
9
10
12
EN
Pin numbers shown are for the J or W package.
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
logic diagram (positive logic)
2Y
1Y
5
3
7
6
1
2
4
2B
2A
1B
1A
1,2EN
4Y
3Y
13
11
15
14
9
10
12
4B
4A
3B
3A
3,4EN
schematics of inputs and outputs
TYPICAL OF ALL OUTPUTS
V
CC
Y Output
EQUIVALENT OF A AND B INPUTS
12 kΩ
3 kΩ
18 kΩ
1 kΩ
V
CC
Input
100 kΩ
A Only
100 kΩ
B Only
Input
V
CC
TYPICAL OF EN INPUT
Page 3
SN55LBC175
QUADRUPLE LOW-POWER DIFFERENTIAL LINE RECEIVER
SGLS083 – MARCH 1995
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range, V
CC
(see Note 1) –0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, A or B inputs, V
I
±25 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential input voltage, V
ID
(see Note 2) ±25 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data and control voltage range –0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
–55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values are with respect to GND.
2. Differential input voltage is measured at the noninverting input with respect to the corresponding inverting input.
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 125°C
POWER RATING
FK 1375 mW 11.0 mW/°C 275 mW
J 1375 mW 11.0 mW/°C 275 mW
W 1000 mW 8.0 mW/°C 200 mW
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.75 5 5.25 V
Common-mode input voltage, V
IC
–7 12 V
Differential input voltage, V
ID
±6 V
High-level input voltage, V
IH
p
2 V
Low-level input voltage, V
IL
EN inputs
0.8 V
High-level output current, I
OH
–8 mA
Low-level output current, I
OL
16 mA
Operating free-air temperature, T
A
–55 125 °C
Page 4
SN55LBC175
QUADRUPLE LOW-POWER DIFFERENTIAL LINE RECEIVER
SGLS083 – MARCH 1995
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
V
IT+
Positive-going input threshold voltage IO = –8 mA 0.2 V
V
IT–
Negative-going input threshold voltage IO =16 mA –0.2 V
V
hys
Hysteresis voltage (V
IT+
– V
IT–
) 45 mV
V
IK
Enable input clamp voltage II = –18 mA –0.9 –1.5 V
V
OH
High-level output voltage VID = 200 mV , IOH = –8 mA 3.5 4.5 V
p
VID = –200 mV, IOL = 16 mA 0.3 0.5
VOLLow-level output voltage
VID = –200 mV, IOL = 16 mA,TA = 125°C 0.7
V
I
OZ
High-impedance-state output current VO = 0 V to V
CC
±20 µA
VIH = 12 V, VCC = 5 V, Other inputs at 0 V 0.7 1
p
A or B
VIH = 12 V, VCC = 0 V, Other inputs at 0 V 0.8 1
IIBus input current
inputs
VIH = –7 V, VCC = 5 V, Other inputs at 0 V –0.5 –0.8
mA
VIH = –7 V, VCC = 0 V, Other inputs at 0 V –0.4 –0.8
I
IH
High-level enable input current VIH = 5 V ±20 µA
I
IL
Low-level enable input current VIL = 0 V –20 µA
I
OS
Short-circuit output
current
VO = 0 –80 –120 mA
pp
Outputs enabled, IO = 0, VID = 5 V 11 20
ICCSupply current
Outputs disabled 0.9 1.4
mA
†
All typical values are at VCC = 5 V and TA = 25°C.
switching characteristics, VCC = 5 V, CL = 15 pF
PARAMETER TEST CONDITIONS T
A
MIN TYP MAX UNIT
p
p
V
= –1.5 V to 1.5 V ,
25°C 11 22 30
t
PHL
Propagation delay time, high- to low-level output
ID
,
See Figure 1
–55°C to 125°C 35
ns
p
p
V
= –1.5 V to 1.5 V ,
25°C 11 22 30
t
PLH
Propagation delay time, lo
w- to
high-level output
ID
,
See Figure 1
–55°C to 125°C 35
ns
p
25°C 17 40
t
PZH
Output enable time to high level
See Figure 2
–55°C to 125°C 45
ns
p
25°C 18 30
t
PZL
Output enable time to low level
See Figure 3
–55°C to 125°C 35
ns
p
25°C 30 40
t
PHZ
Output disable time from high level
See Figure 2
–55°C to 125°C 55
ns
p
25°C 23 30
t
PLZ
Output disable time from low level
See Figure 3
–55°C to 125°C 45
ns
25°C 4 6
t
sk(p)
Pulse skew (|t
PHL
–
t
PLH
|)
See Figure 1
–55°C to 125°C 7
ns
25°C 3 10
ttTransition time
See Figure 1
–55°C to 125°C 16
ns
Page 5
SN55LBC175
QUADRUPLE LOW-POWER DIFFERENTIAL LINE RECEIVER
SGLS083 – MARCH 1995
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
V
OL
V
OH
– 1.5 V
1.5 V
Output
Input
1.3 V1.3 V
t
PHL
t
PLH
0 V0 V
(see Note A)
Generator
Output
(see Note B)
CL = 15 pF
50 Ω
TEST CIRCUIT
VOLTAGE WAVEFORMS
t
t
t
t
90%
10%
2 V
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, duty cycle ≤ 50%, tr ≤ 6 ns, t
f
≤ 6 ns, ZO = 50 Ω.
B. CL includes probe and jig capacitance.
Figure 1. t
PLH
and t
PHL
Test Circuit and Voltage Waveforms
0 V
S1 Open
S1 Clos
e
1.3 V1.3 V
t
PHZ
t
PZH
0.5 V
See Note C
V
CC
2 kΩ
S1
5 kΩ
1.5 V
CL = 15 pF
(see Note B)
Output
Generator
(see Note A)
1.3 V
Input
Output
3 V
0 V
V
OH
≈ 1.4 V
50 Ω
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, duty cycle ≤ 50%, tr ≤ 6 ns,
tf ≤ 6 ns, ZO = 50 Ω.
B. CL includes probe and jig capacitance.
C. All diodes are 1N916 or equivalent.
Figure 2. t
PHZ
and t
PZH
Test Circuit and Voltage Waveforms
Page 6
SN55LBC175
QUADRUPLE LOW-POWER DIFFERENTIAL LINE RECEIVER
SGLS083 – MARCH 1995
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
S2
0 V
3 V
S2 Closed
t
PLZ
S2 Open
t
PZL
V
OL
Output
Input
1.3 V
(see Note A)
Generator
Output
(see Note B)
CL = 15 pF
1.5 V
See Note C
0.5 V
1.3 V 1.3 V
50 Ω
5 kΩ
2 kΩ
V
CC
≈ 1.4 V
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, duty cycle ≤ 50%, tr ≤ 6 ns,
tf ≤ 6 ns, ZO = 50 Ω.
B. CL includes probe and jig capacitance.
C. All diodes are 1N916 or equivalent.
Figure 3. t
PZL
and t
PLZ
Test Circuit and Voltage Waveforms
TYPICAL CHARACTERISTICS
OUTPUT VOLTAGE
vs
DIFFERENTIAL INPUT VOLTAGE
Figure 4
1.5
1
0.5
0
01020304050
– Output Voltage – V
2
2.5
3
60 70 80
90 100
3.5
4
4.5
V
O
VID – Differential Input Voltage – mV
VCC = 5 V
TA = 25°C
V
IC
= – 7 V
V
IC
= 0 V
V
IC
= 12 V
V
IC
= – 7 V
V
IC
= 0 V
V
IC
= 12 V
1.5
1
0.5
0
0 – 4 – 8 – 12 – 16 – 20
– High-Level Output Voltage – V
2
2.5
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
3
– 24 – 28 – 32
– 36 – 40
3.5
4
4.5
V
OH
IOH – High-Level Output Current – mA
5
5.5
VCC = 4.75 V
VCC = 5.25 V
VCC = 5 V
VID = 0.2 V
TA = 25°C
Figure 5
Page 7
SN55LBC175
QUADRUPLE LOW-POWER DIFFERENTIAL LINE RECEIVER
SGLS083 – MARCH 1995
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
180
120
60
0
03691215
– Low-Level Output Voltage – mV
240
300
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
360
18 21 24
27 30
420
480
540
V
OL
IOL – Low-Level Output Current – mA
600
660
TA = 25°C
VCC = 5 V
VID = 200 mV
Figure 6
6
4
2
0
10 K 100 K 2 M
– Average Supply Current – mA
8
10
AVERAGE SUPPLY CURRENT
vs
FREQUENCY
12
10 M 100 M
14
I
CC
f – Frequency – Hz
TA = 25°C
VCC = 5 V
Figure 7
BUS
INPUT CURRENT
vs
INPUT VOLTAGE
(COMPLEMENTARY INPUT AT 0 V)
Figure 8
– 0.4
– 0.6
– 0.8
– 1
– 8– 6 – 4– 2 0 2
– Input Current – mA
– 0.2
0
0.2
468
10 12
0.4
0.6
0.8
I
I
VI – Input Voltage – V
1
TA = 25°C
VCC = 5 V
The shaded region of this graph represents
more than 1 unit load per RS-485.
PROPAGATION DELAY TIME
vs
FREE-AIR TEMPERATURE
Figure 9
23.5
23
22.5
22
– 40 – 20 0 20 40 60
Propagation Delay Time – ns
24
24.5
80 100
TA – Free-Air Temperature – °C
t
PHL
t
PLH
VCC = 5 V
CL = 15 pF
VIO = ±1.5 V
Page 8
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