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SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS278 – JANUARY 1995
Copyright 1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
•Bidirectional Bus Transceivers in
High-Density 20-Pin Packages
•True Logic
•3-State Outputs
•Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
description
These octal bus transceivers are designed for
asynchronous two-way communication between
data buses. These devices transmit data from the
A bus to the B bus or from the B bus to the A bus,
depending on the level at the direction-control
(DIR) input. The output-enable (OE) input can be
used to disable the device so that the buses are
eectively isolated.
The -1 version of the SN74ALS645A is identical
to the standard version, except that the
recommended maximum IOL is increased to
48 mA. There is no -1 version of the
SN54ALS645A.
The SN54ALS645A and SN54AS645 are
characterized for operation over the full military
temperature range of –55 C to 125° °C. The
SN74ALS645A and SN74AS645 are
characterized for operation from 0°C to 70 C.°
FUNCTION TABLE
INPUTS
OPERATION
OE DIR
OPERATION
L L B data to A bus
L H A data to B bus
H X Isolation
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
VCC
OE
B1
B2
B3
B4
B5
B6
B7
B8
SN54ALS645A, SN54AS645 . . . J PACKAGE
SN74ALS645A, SN74AS645 . . . DW OR N PACKAGE
(TOP VIEW)
3 2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
B1
B2
B3
B4
B5
A3
A4
A5
A6
A7
SN54ALS645A, SN54AS645 . . . FK PACKAGE
(TOP VIEW)
A2
A1
DIR
B7
B6 OE
A8
GND
B8
V
CC
PRODUCTION DATA information is current as of publication date.
Products conform to specications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Produktspecifikationer
| Varumärke: | Texas Instruments |
| Kategori: | Inte kategoriserad |
| Modell: | SN74ALS645A-1N |
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