SN54HC623 Datasheet, PDF (1/6 Pages) Texas Instruments – OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS

SN54HC623, SN74HC623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS149B – DECEMBER 1982 – REVISED MAY 1997
D Lock Bus-Latch Capability
D True Logic
D High-Current 3-State Outputs Can Drive up
to 15 LSTTL Loads
D Package Options Include Plastic
Small-Outline (DW) and Ceramic Flat (W)
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. The control-function implementation
allows for maximum flexibility in timing.
The ’HC623 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 (OEAB and OEBA) inputs.
OEAB and OEBA disable the device so that the
buses are effectively isolated. The dual-enable
configuration gives the transceivers the capability
to store data by simultaneously enabling OEAB
and OEBA. Each output reinforces its input in this
transceiver configuration. When both OEAB and
OEBA are enabled and all other data sources to
the two sets of bus lines are in the high-impedance
state, both sets of bus lines (16 total) remain at
their last states. The 8-bit codes appearing on the
two sets of buses are identical.
SN54HC623 . . . J OR W PACKAGE
SN74HC623 . . . DW OR N PACKAGE
(TOP VIEW)
OEAB ₁
A1 ₂
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
GND 10
20 ^V_CC
19 ^OEBA
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
SN54HC623 . . . FK PACKAGE
(TOP VIEW)
A3
3 2 1 20 19
4
18
B1
A4 5
17 B2
A5 6
16 B3
A6 7
15 B4
A7 8
14 B5
9 10 11 12 13
The SN54HC623 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74HC623 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
OEBA OEAB
OPERATION
L
L
B data to A bus
H
H
A data to B bus
H
L
Isolation
L
H
B data to A bus,
A data to B bus
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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.
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Copyright © 1997, Texas Instruments Incorporated
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