SN54BCT543, SN74BCT543
OCTAL REGISTERED TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS026C – NOVEMBER 1988 – REVISED APRIL 1994
SN54BCT543 . . . JT OR W PACKAGE
SN74BCT543 . . . DW OR NT PACKAGE
(TOP VIEW)
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
• 3-State True Outputs
• Back-to-Back Registers for Storage
LEBA
OEBA
A1
1
2
3
4
5
6
7
8
9
10
24
V
CC
23 CEBA
22 B1
21 B2
20 B3
19 B4
18 B5
17 B6
16 B7
• ESD Protection Exceeds 2000 V
Per MIL-STD-883C, Method 3015
A2
A3
A4
A5
A6
A7
A8
• Package Options Include Plastic
Small-Outline Packages (DW), Ceramic
Chip Carriers (FK) and Flatpacks (W), and
Plastic and Ceramic 300-mil DIPs (JT, NT)
description
15
B8
The ′BCT543 octal transceiver contains two sets
of D-type latches for temporary storage of data
flowing in either direction. Separate latch-enable
(LEAB or LEBA) and output-enable (OEAB or
OEBA) inputs are provided for each register to
permit independent control in either direction of
data flow.
CEAB 11
GND 12
14 LEAB
13 OEAB
SN54BCT543 . . . FK PACKAGE
(TOP VIEW)
The A-to-B enable (CEAB) input must be low in
order to enter data from A or to output data from
B. If CEAB is low and LEAB is low, the A-to-B
latches are transparent; a subsequent low-to-high
transitionofLEABputstheAlatchesinthestorage
mode. With CEAB and OEAB both low, the 3-state
B outputs are active and reflect the data present
at the output of the A latches. Data flow from B to
A is similar but requires using the CEBA, LEBA,
and OEBA inputs.
4
3
2
1
28 27 26
25
5
A2
A3
A4
NC
A5
A6
A7
B2
B3
B4
6
24
23
7
8
22 NC
21 B5
20 B6
19 B7
9
10
11
12 13 14 15 16 17 18
The SN54BCT543 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74BCT543 is characterized for
operation from 0°C to 70°C.
NC – No internal connection
†
FUNCTION TABLE
INPUTS
OUTPUT
B
CEAB
LEAB
OEAB
A
X
X
X
L
H
X
L
L
L
X
X
H
L
X
H
L
Z
Z
‡
B
0
L
L
L
L
H
H
†
‡
A-to-B data flow is shown; B-to-A flow control is the
same except that it uses CEBA, LEBA, and OEBA.
Output level before the indicated steady-state input
conditions were established.
Copyright 1994, Texas Instruments Incorporated
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.
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265