SN74ABT543A
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SCBS464A – JUNE 1992 – REVISED JUNE 1994
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State-of-the-Art EPIC-ΙΙB ™ BiCMOS Design
Significantly Reduces Power Dissipation
ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015; Exceeds
200 V Using Machine Model (C = 200 pF,
R = 0)
Latch-Up Performance Exceeds 500 mA
Per JEDEC Standard JESD-17
Typical VOLP (Output Ground Bounce) < 1 V
at VCC = 5 V, TA = 25°C
High-Drive Outputs (–32-mA IOH,
64-mA IOL)
Package Options Include Plastic
Small-Outline (DW) and Shrink
Small-Outline (DB) Packages, and Standard
Plastic 300-mil DIPs (JT)
DB, DW, OR NT PACKAGE
(TOP VIEW)
LEBA
OEBA
A1
A2
A3
A4
A5
A6
A7
A8
CEAB
GND
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
VCC
CEBA
B1
B2
B3
B4
B5
B6
B7
B8
LEAB
OEAB
description
The SN74ABT543A 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.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
The SN74ABT543A is packaged in TI’s shrink small-outline package (DB), which provides the same I/O pin
count and functionality of standard small-outline packages in less than half the printed-circuit-board area.
The SN74ABT543A is characterized for operation from – 40°C to 85°C.
FUNCTION TABLE†
INPUTS
A
OUTPUT
B
X
X
Z
H
X
Z
X
B0‡
L
CEAB
LEAB
OEAB
H
X
X
X
L
H
L
L
L
L
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.
EPIC-ΙΙB is a trademark of Texas Instruments Incorporated.
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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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