SN54HCT623 Datasheet, PDF (1/6 Pages) Texas Instruments – OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS

SN54HCT623, SN74HCT623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS016B – MARCH 1984 – REVISED MAY 1997
D Inputs Are TTL-Voltage Compatible
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.
SN54HCT623 . . . J OR W PACKAGE
SN74HCT623 . . . 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
SN54HCT623 . . . FK PACKAGE
(TOP VIEW)
The ’HCT623 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.
The output-enable inputs 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.
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 SN54HCT623 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74HCT623 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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