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Texas Instruments (TI) Electronic Components Datasheet

SN74F243 Datasheet

Quadruple Bus Transceivers

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Asynchronous Communication Between
Data Buses
Local Bus-Latch Capability
True Logic
Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
description
These quadruple bus transceivers are designed
for asynchronous communications between data
buses. The control function implementation allows
for maximum flexibility in timing. These devices
allow data transmission from the A bus to the
B bus or from the B bus to the A bus depending
upon the logic levels at the output-enable (OEBA
and OEAB) inputs. The output-enable inputs can
be used to disable the device so that the buses are
effectively isolated.
The dual-enable configuration gives the
quadruple bus transceivers the capability to store
data by simultaneous enabling of OEBA and
OEAB. Each output reinforces its input in this
transceiver configuration. Thus, when both control
inputs are enabled and all other data sources to
the two sets of bus lines are at high impedance,
both sets of bus lines (eight in all) remain at their
states. The 4-bit codes appearing on the two sets
of buses will be identical for the F243.
The SN54F243 is characterized for operation over
the full military temperature range of − 55°C to
125°C. The SN74F243 is characterized for
operation from 0°C to 70°C.
SN54F243, SN74F243
QUADRUPLE BUS TRANSCEIVERS
WITH 3ĆSTATE OUTPUTS
SDFS086 − MARCH 1987 − REVISED OCTOBER 1993
SN54F243 . . . J PACKAGE
SN74F243 . . . D OR N PACKAGE
(TOP VIEW)
OEAB
NC
A1
A2
A3
A4
GND
1
2
3
4
5
6
7
14 VCC
13 OEBA
12 NC
11 B1
10 B2
9 B3
8 B4
SN54F243 . . . FK PACKAGE
(TOP VIEW)
A1
3 2 1 20 19
4 18
NC
NC 5
17 NC
A2 6
16 B1
NC 7
15 NC
A3 8
14 B2
9 10 11 12 13
NC − No internal connection
FUNCTION TABLE
INPUTS
OEAB OEBA
FUNCTION
LL
A to B
HH
B to A
HL
Isolation
L
H
Latch A and B
(A = B)
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.
Copyright 1993, Texas Instruments Incorporated
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
2−1


Texas Instruments (TI) Electronic Components Datasheet

SN74F243 Datasheet

Quadruple Bus Transceivers

No Preview Available !

SN54F243, SN74F243
QUADRUPLE BUS TRANSCEIVERS
WITH 3ĆSTATE OUTPUTS
SDFS086 − MARCH 1987 − REVISED OCTOBER 1993
logic symbol
OEBA
OEAB
A1
13
1
3
4
A2
5
A3
6
A4
EN1
EN2
1
2
11
B1
10
B2
9
B3
8
B4
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
OEAB
A1
1
3
13
OEBA
11
B1
4
A2
10
B2
5
A3
9
B3
6
A4
Pin numbers shown are for the D, J, and N packages.
8
B4
2−2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443


Part Number SN74F243
Description Quadruple Bus Transceivers
Maker Texas
Total Page 5 Pages
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