SN54F242_08 Datasheet, PDF (1/5 Pages) Texas Instruments – QUADRUPLE BUS TRANSCEIVERS WITH 3-STATE OUTPUTS

• Asynchronous Communication Between
Data Buses
• Local Bus-Latch Capability
• Inverting Logic
• Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
description
SN54F242, SN74F242
QUADRUPLE BUS TRANSCEIVERS
WITH 3ĆSTATE OUTPUTS
SDFS062A − D2932, MARCH 1987 − REVISED OCTOBER 1993
SN54F242 . . . J PACKAGE
SN74F242 . . . D OR N PACKAGE
(TOP VIEW)
OEAB 1
NC 2
A1 3
A2 4
A3 5
A4 6
GND 7
14 V_CC
13 OEBA
12 NC
11 B1
10 B2
9 B3
8 B4
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 complementary for the ′F242.
SN54F242 . . . 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
The SN54F242 is characterized for operation over the full military temperature range of −55°C to 125°C. The
SN74F242 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OEAB OEBA
FUNCTION
L
L
A to B
H
H
B to A
H
L
Isolation
Latch A and B
L
H
(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
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