SN54BCT543, SN74BCT543
OCTAL REGISTERED TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS026C – NOVEMBER 1988 – REVISED APRIL 1994
Copyright 1994, Texas Instruments Incorporated
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
• 3-State True Outputs
• Back-to-Back Registers for Storage
• ESD Protection Exceeds 2000 V
Per MIL-STD-883C, Method 3015
• 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
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.
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
transition of LEAB
puts the A latches in the storage
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.
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.
FUNCTION TABLE
†
INPUTS
OUTPUT
CEAB LEAB OEAB A
B
H X X X Z
X XHX Z
L HLX B
0
‡
L LLL 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.
SN54BCT543 . . . JT OR W PACKAGE
SN74BCT543 . . . DW OR NT PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
LEBA
OEBA
A1
A2
A3
A4
A5
A6
A7
A8
CEAB
GND
V
CC
CEBA
B1
B2
B3
B4
B5
B6
B7
B8
LEAB
OEAB
SN54BCT543 . . . FK PACKAGE
(TOP VIEW)
3212827
12 13
5
6
7
8
9
10
11
25
24
23
22
21
20
19
B2
B3
B4
NC
B5
B6
B7
A2
A3
A4
NC
A5
A6
A7
426
14 15 16 1718
A8
CEAB
GND
NC
OEAB
LEAB
B8
A1
OEBA
LEBA
NC
CEBA
B1
V
CC
NC – No internal connection
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.
