Texas Instruments SN75ALS170ADW, SN75ALS170ADWR, SN75ALS170DW, SN75ALS170DWR, SN75ALS170J Datasheet

SN75ALS170, SN75ALS170A

TRIPLE DIFFERENTIAL BUS TRANSCEIVER

SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995

D

Three Bidirectional Transceivers

D

Driver Meets or Exceeds ANSI Standard
EIA/TIA-422-B and RS-485 and ITU
Recommendation V.11

D

Two Skew Limits Available

D

Designed to Operate Up to 20 Million Data
Transfers per Second (FAST-20 SCSI)

D

High-Speed Advanced Low-Power Schottky
Circuitry

D

Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments

D

Wide Positive and Negative Input/Output
Bus Voltage Ranges

D

Driver Output Capacity...±60 mA

D

Thermal Shutdown Protection

D

Driver Positive- and Negative-Current
Limiting

D

Receiver Input Impedances...12 kΩ Min

D

Receiver Input Sensitivity...±300 mV Max

D

Receiver Input Hysteresis...60 mV Typ

D

Operate From a Single 5-V Supply

D

Glitch-Free Power-Up and Power-Down
Protection

D

Feature Independent Direction Controls for
Each Channel

description

DW PACKAGE

(TOP VIEW)

1D

1

1DIR

GND

2DIR

3DIR

NC – No internal connection

1DIR
GND

2DIR

3DIR

NC

NC

2D

NC

3D

1D

2D

3D

2
3
4
5
6
7
8
9
10

J PACKAGE

(TOP VIEW)

1
2
3
4
5
6
7

20
19
18
17
16
15
14
13
12
11

14
13
12

10

1B
1A
NC
NC
V

CC

2B
2A
3B
3A
NC

1B
1A
V

CC

2B

11

2A

9

3B

8

3A

The SN75ALS170 and SN75ALS170A triple differential bus transceivers are monolithic integrated circuits
designed for bidirectional data communication on multipoint bus transmission lines. It is designed for balanced
transmission lines and the driver meets ANSI Standards EIA/TIA-422-B and RS-485 and both the driver and
receiver meet ITU Recommendation V .1 1. The SN75ALS170A is designed for F AST -20 SCSI and can transmit
or receive data pulses as short as 30 ns with a maximum skew of 5 ns.

The SN75ALS170 and SN75ALS170A operate from a single 5-V power supply . The drivers and receivers have
active-high and active-low enables, respectively, which are internally connected together 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

= 0. These ports feature wide positive and negative common-mode voltage ranges

CC

making the device suitable for party-line applications.
The SN75ALS170 and the SN75ALS170A are characterized for operation from 0°C to 70°C.

AVAILABLE OPTIONS

SKEW LIMIT

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.

10 ns SN75ALS170DW SN75ALS170J

5 ns SN75ALS170ADW

PART NUMBER

Copyright  1995, Texas Instruments Incorporated

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

1

SN75ALS170, SN75ALS170A

DIR

DIR

TRIPLE DIFFERENTIAL BUS TRANSCEIVER

SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995

Function Tables

EACH DRIVER

INPUT

D

H H H L

L H L H

X L Z Z

EACH RECEIVER

DIFFERENTIAL INPUTS

A – B

VID ≥ 0.3 V L H

–0.3 V < VID < 0.3 V L ?

VID ≤ – 0.3 V L L

X H Z

Open L H

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

OUTPUTS

A B

OUTPUT

R

logic symbol

2

1DIR

1

1D

7

2DIR

6

2D

10

3DIR

9

3D

†

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

Pin numbers shown are for the DW package.

†

EN

EN

EN

EN

EN

EN

1

1

1

19
20

14
15

12
13

logic diagram (positive logic)

2

1A
1B

2A
2B

3A
3B

1DIR

1D

2DIR

2D

3DIR

3D

1

7
6

10
9

19
20

14
15

12
13

1A
1B

2A
2B

3A
3B

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PACKAGE

A

A

schematics of inputs and outputs

SN75ALS170, SN75ALS170A

TRIPLE DIFFERENTIAL BUS TRANSCEIVER

SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995

EQUIVALENT OF EACH INPUT

V

CC

R

(eq)

Input

Driver Input: R
Enable Inputs: R
R

= equivalent resistor

(eq)

= 12 kΩ NOM

(eq)

= 8 kΩ

(eq)

NOM

TYPICAL OF A AND B I/O PORTS TYPICAL OF RECEIVER OUTPUT

V

CC

180 kΩ
NOM
Connected
on A Port

A or B

18 kΩ

NOM

180 kΩ
NOM
Connected
on B Port

3 kΩ
NOM

1.1 kΩ
NOM

85 Ω
NOM

V

CC

Output

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

Supply voltage, V

Voltage range at any bus terminal –7 V to 12 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Enable input voltage, V

Continuous total power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T
Storage temperature range, T

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

Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package 300°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.

NOTE 1: All voltage values, except differential I/O bus voltage, are with respect to network ground terminal.

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

CC

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

I

0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

stg

A

†

DISSIPATION RATING TABLE

T

≤ 25°C DERATING FACTOR T

POWER RATING ABOVE TA = 25°C

DW 1125 mW 9.0 mW/°C 720 mW

J 1025 mW 8.2 mW/°C 656 mW

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

= 70°C

POWER RATING

3

SN75ALS170, SN75ALS170A

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

V

V

High-level output current, I

Low-level output current, I

mA

TRIPLE DIFFERENTIAL BUS TRANSCEIVER

SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995

recommended operating conditions

MIN TYP MAX UNIT

Supply voltage, V

High-level input voltage, V
Low-level input voltage, V
Differential input voltage, VID (see Note 2) ±12 V

Operating free-air temperature, T

NOTE 2: 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

A

or

I

IC

D, DIR 2 V
D, DIR 0.8 V

Driver –60 mA
Receiver –400 µA
Driver 60
Receiver 8

4.75 5 5.25 V
12

–7

0 70 °C

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

V

CC

V

IH

VOHHigh level out ut voltage

V

I

A

2.7

V

OD2

g

VOCCommon-mode output voltage

R

540 Ω

100 Ω

1

V

IOOutput current

,

mA

I

Short-ci

t

mA

ICCSupply current

No load

mA

SN75ALS170, SN75ALS170A

TRIPLE DIFFERENTIAL BUS TRANSCEIVER

SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995

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

V

OL

| V

OD1

| V

OD2

V

OD3

∆ | VOD |

∆ | VOC |

I

IH

I

IL

OS

†

The power-off measurement in ANSI Standard EIA/TIA-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.

§

The minimum V

¶

∆ | 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.

NOTE 3: This applies for both power on and off; refer to EIA Standard RS-485 for exact conditions. The EIA/TIA-422-B limit does not apply for

Input clamp voltage II = –19 mA –1.5 V
Output voltage IO = 0 0 6 V

High-level output voltage

Low-level output voltage

| Differential output voltage IO = 0 1.5 6 V

| Differential output voltage

Differential output voltage 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

a combined driver and receiver terminal.

¶

rcuit output curren

with a 100-Ω load is either 1/2 V

or 2 V, whichever is greater.

OD1

= 4.75 V,

= 0.8 V,

IL

VCC = 4.75 V,
VIL = 0.8 V,

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

= –7 V to 12 V , See Figure 2 1.5 5 V

test

=

L

Output disabled,
See Note 3

VO = –6 V –250
VO = 0 –150
VO = V
VO = 8 V 250

CC

or

,See Figure

†

= 2 V,

= –55 m

OH

VIH = 2 V,
IOL = 55 mA

VO = 12 V 1
VO = –7 V –0.8

Outputs enabled 69 90
Outputs disabled 57 78

MIN TYP‡MAX UNIT

2.7 V

1.7 V

1/2V

OD1

§

or 2

±0.2 V

–1

±0.2 V

250

V

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5