Texas Instruments SN65176B, SN75176B Datasheet

SN65176B, SN75176B

DIFFERENTIAL BUS TRANSCEIVERS

SLLS101B – JULY 1985 – REVISED JUNE 1999

D

Bidirectional Transceivers

D

Meet or Exceed the Requirements of ANSI
Standards TIA/EIA-422-B and TIA/EIA-485-A
and ITU Recommendations V.11 and X.27

D

Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments

D

3-State Driver and Receiver Outputs

D

Individual Driver and Receiver Enables

D

Wide Positive and Negative Input/Output

D OR P PACKAGE

(TOP VIEW)

R
RE
DE

1
2
3

D

4

8
7
6
5

V

CC

B
A
GND

Bus Voltage Ranges

D

Driver Output Capability...±60 mA Max

D

Thermal Shutdown Protection

D

Driver Positive and Negative Current
Limiting

D

Receiver Input Impedance...12 kΩ Min

D

Receiver Input Sensitivity...±200 mV

D

Receiver Input Hysteresis...50 mV Typ

D

Operate From Single 5-V Supply

description

The SN65176B and SN75176B differential bus transceivers are monolithic integrated circuits designed for
bidirectional data communication on multipoint bus transmission lines. They are designed for balanced
transmission lines and meet ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A and ITU Recommendations
V.11 and X.27.

The SN65176B and SN75176B combine a 3-state differential line driver and a differential input line receiver,
both of which operate from a single 5-V power supply . The driver and receiver have active-high and active-low
enables, respectively, that can be connected together externally to function as a direction control. The driver
differential outputs and the receiver differential inputs are connected internally to form differential input/output
(I/O) bus ports that are designed to offer minimum loading to the bus when the driver is disabled or V

CC

= 0.
These ports feature wide positive and negative common-mode voltage ranges, making the device suitable for
party-line applications.

The driver is designed for up to 60 mA of sink or source current. The driver features positive and negative current
limiting and thermal shutdown for protection from line-fault conditions. Thermal shutdown is designed to occur
at a junction temperature of approximately 150°C. The receiver features a minimum input impedance of 12 kΩ,
an input sensitivity of ±200 mV, and a typical input hysteresis of 50 mV.

The SN65176B and SN75176B can be used in transmission-line applications employing the SN75172 and
SN75174 quadruple differential line drivers and SN75173 and SN75175 quadruple differential line receivers.

The SN65176B is characterized for operation from – 40°C to 105°C and the SN75176B is characterized for
operation from 0°C to 70°C.

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.

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1999, Texas Instruments Incorporated

1

SN65176B, SN75176B
DIFFERENTIAL BUS TRANSCEIVERS

SLLS101B – JULY 1985 – REVISED JUNE 1999

INPUT ENABLE

D DE

H H H L

L H L H

X L Z Z

DIFFERENTIAL INPUTS

VID ≥ 0.2 V L H

–0.2 V < VID < 0.2 V L ?

VID ≤ – 0.2 V L L

H = high level, L = low level, ? = indeterminate,
X = irrelevant, Z = high impedance (off)

Function Tables

DRIVER

OUTPUTS

A B

RECEIVER

ENABLE OUTPUT

A–B RE R

X H Z

Open L ?

logic symbol

DE
RE

†

This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.

†

3

EN1

2

EN2

4

D

1

R

2

1
1

logic diagram (positive logic)

3

DE

4

D

2

6

A

7

B

RE

6

1

R

A

7

Bus

B

2

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Voltage at any bus terminal (separately or common mode), V

V

V

High-level output current, I

Low-level output current, I

mA

Operating free-air temperature, T

°C

schematics of inputs and outputs

SN65176B, SN75176B

DIFFERENTIAL BUS TRANSCEIVERS

SLLS101B – JULY 1985 – REVISED JUNE 1999

EQUIVALENT OF EACH INPUT

V

CC

R

(eq)

Input

Driver input: R
Enable inputs: R
R

= equivalent resistor

(eq)

= 3 kΩ NOM

(eq)

)= 8 kΩ NOM

(eq

TYPICAL OF A AND B I/O PORTS

16.8 kΩ

NOM

Input/Output

Port

960 Ω
NOM

960 Ω
NOM

V

CC

GND

TYPICAL OF RECEIVER OUTPUT

V

CC

85 Ω
NOM

Output

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, V

Voltage range at any bus terminal –10 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Enable input voltage, V
Package thermal impedance, θ

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

†

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, except differential input/output bus voltage, are with respect to network ground terminal.

2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.

(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC

5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I

(see Note 2): D package 197°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

JA

P package 104°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

†

recommended operating conditions

Supply voltage, V

High-level input voltage, V
Low-level input voltage, V
Differential input voltage, VID (see Note 3) ±12 V

p

NOTE 3: Differential-input/output bus voltage is measured at the noninverting terminal A with respect to the inverting terminal B.

CC

p

IH

IL

p

p

OH

OL

p

A

or

I

IC

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MIN TYP MAX UNIT

4.75 5 5.25 V
12

–7
D, DE, and RE 2 V
D, DE, and RE 0.8 V

Driver –60 mA
Receiver –400 µA
Driver 60
Receiver 8
SN65176B –40 105
SN75176B 0 70

°

3

SN65176B, SN75176B

OD2

g

∆|VOD|

gg

±0.2

V

VOCCommon-mode output voltage

R

100 Ω

See Figure 1

V

∆|VOC|

gg

±0.2

V

IOOutput current

,

mA

IOSShort-circuit output current

mA

ICCSupply current (total package)

No load

mA

R

See Figure 3

DIFFERENTIAL BUS TRANSCEIVERS

SLLS101B – JULY 1985 – REVISED JUNE 1999

DRIVER SECTION

electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)

PARAMETER TEST CONDITIONS

V

IK

V

O

|V

OD1

|V

OD2

V

OD3

I

IH

I

IL

†

The power-off measurement in ANSI Standard TIA/EIA-422-B applies to disabled outputs only and is not applied to combined inputs and outputs.

‡

All typical values are at VCC = 5 V and TA = 25°C.

§

∆|VOD| and ∆|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a low
level.

¶

The minimum V

NOTES: 4. See ANSI Standard TIA/EIA-485-A, Figure 3.5, Test Termination Measurement 2.

Input clamp voltage II = –18 mA –1.5 V
Output voltage IO = 0 0 6 V

| Differential output voltage IO = 0 1.5 3.6 6 V

| Differential output voltage

Differential output voltage See Note 4 1.5 5 V
Change in magnitude of differential output

§

voltage

p

Change in magnitude of common-mode
output voltage

p

High-level input current VI = 2.4 V 20 µA
Low-level input current VI = 0.4 V –400 µA

pp

OD2

5. This applies for both power on and off; refer to ANSI Standard TIA/EIA-485-A for exact conditions. The TIA/EIA-422-B limit do es
not apply for a combined driver and receiver terminal.

§

p

p

with a 100-Ω load is either 1/2 V

RL = 100 Ω, See Figure 1
RL = 54 Ω, See Figure 1 1.5 2.5 5 V

= 54 Ω or

L

Output disabled,
See Note 5

VO = –7 V –250
VO = 0 150
VO = V

CC

VO = 12 V 250

or 2 V, whichever is greater.

OD1

,

†

VO = 12 V 1
VO = – 7 V –0.8

Outputs enabled 42 70
Outputs disabled 26 35

MIN TYP‡MAX UNIT

1/2 V

OD1

¶

or 2

+3
–1

250

V

switching characteristics, VCC = 5 V, RL = 110 kΩ, TA = 25°C (unless otherwise noted)

t

d(OD)

t

t(OD)

t

PZH

t

PZL

t

PHZ

t

PLZ

4

Differential-output delay time
Differential-output transition time
Output enable time to high level See Figure 4 85 120 ns
Output enable time to low level See Figure 5 40 60 ns
Output disable time from high level See Figure 4 150 250 ns
Output disable time from low level See Figure 5 20 30 ns

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

= 54 Ω,

L

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15 22 ns
20 30 ns