SN54HCT645 Datasheet, PDF (1/6 Pages) Texas Instruments – OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS

D Inputs Are TTL-Voltage Compatible
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. These devices transmit data from the
A bus to the B bus or from the B bus to the A bus,
depending upon the level at the direction-control
(DIR) input. The output-enable (OE) input can be
used to disable the device so the buses are
effectively isolated.
The SN54HCT645 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74HCT645 is characterized for
operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
OE DIR
OPERATION
L
L
B data to A bus
L
H A data to B bus
H
X
Isolation
SN54HCT645, SN74HCT645
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS019B – MARCH 1984 – REVISED MAY 1997
SN54HCT645 . . . J OR W PACKAGE
SN74HCT645 . . . DW OR N PACKAGE
(TOP VIEW)
DIR 1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
GND 10
20 V_CC
19 OE
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
SN54HCT645 . . . FK PACKAGE
(TOP VIEW)
3 2 1 20 19
A3 ₄
18 ^B1
A4 ₅
17 ^B2
A5 6
16 B3
A6 7
15 B4
A7 8
14 B5
9 10 11 12 13
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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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