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SN75ALS170A Datasheet Preview

SN75ALS170A Datasheet

TRIPLE DIFFERENTIAL BUS TRANSCEIVER

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SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
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 kMin
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
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
DW PACKAGE
(TOP VIEW)
1D 1
1DIR 2
NC 3
GND 4
NC 5
2D 6
2DIR 7
NC 8
3D 9
3DIR 10
20 1B
19 1A
18 NC
17 NC
16 VCC
15 2B
14 2A
13 3B
12 3A
11 NC
NC – No internal connection
J PACKAGE
(TOP VIEW)
1D 1
1DIR 2
GND 3
2D 4
2DIR 5
3D 6
3DIR 7
14 1B
13 1A
12 VCC
11 2B
10 2A
9 3B
8 3A
description
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.11. The SN75ALS170A is designed for FAST-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 VCC = 0. These ports feature wide positive and negative common-mode voltage ranges
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
PART NUMBER
10 ns
SN75ALS170DW SN75ALS170J
5 ns
SN75ALS170ADW
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 © 1995, Texas Instruments Incorporated
1




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SN75ALS170A Datasheet Preview

SN75ALS170A Datasheet

TRIPLE DIFFERENTIAL BUS TRANSCEIVER

No Preview Available !

SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
Function Tables
INPUT
D
H
L
X
EACH DRIVER
OUTPUTS
DIR
A
B
H
H
L
H
L
H
L
Z
Z
EACH RECEIVER
DIFFERENTIAL INPUTS
A–B
DIR
OUTPUT
R
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)
logic symbol
logic diagram (positive logic)
2
1DIR
1
1D
EN
EN
1
19
1A
20
1B
2
1DIR
1
1D
19
1A
20
1B
7
2DIR
6
2D
10
3DIR
9
3D
EN
EN
1
EN
EN
1
14
2A
15
2B
12
3A
13
3B
7
2DIR
6
2D
10
3DIR
9
3D
14
2A
15
2B
12
3A
13
3B
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
Pin numbers shown are for the DW package.
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Part Number SN75ALS170A
Description TRIPLE DIFFERENTIAL BUS TRANSCEIVER
Maker etcTI
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SN75ALS170A Datasheet PDF






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