SN74BCT29843 Datasheet, PDF (1/5 Pages) Texas Instruments – 9-BIT BUS-INTERFACE D-TYPE LATCH WITH 3-STATE OUTPUTS

SN74BCT29843
9-BIT BUS-INTERFACE D-TYPE LATCH
WITH 3-STATE OUTPUTS
SCBS022C – FEBRUARY 1989 – REVISED NOVEMBER 1993
• BiCMOS Process With CMOS Inputs and
TTL Outputs Substantially Reduces
Standby Current
• Input Has 50 kΩ
• Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (NT)
description
The SN74BCT29843 features 3-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. It is particularly
suitable for implementing wider buffer registers,
I/O ports, bidirectional bus drivers with parity, and
working registers.
DW OR NT PACKAGE
(TOP VIEW)
OE 1
1D 2
2D 3
3D 4
4D 5
5D 6
6D 7
7D 8
8D 9
9D 10
CLR 11
GND 12
24 V_CC
23 1Q
22 2Q
21 3Q
20 4Q
19 5Q
18 6Q
17 7Q
16 8Q
15 9Q
14 PRE
13 LE
The nine latches are transparent D-type latches. When the latch-enable (LE) input is high, the Q outputs are
complementary to the noninverting data (D) inputs.
A buffered output-enable (OE) input can be used to place the nine outputs in either a normal logic state (high
or low level) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus
lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without
need for interface or pull-up components.
The output enable (OE) does not affect the internal operation of the flip-flops. Old data can be retained or new
data can be entered while the outputs are in the high-impedance state.
The SN74BCT29843 is characterized for operation from 0°C to 70°C.
PRE
L
H
H
H
H
X
FUNCTION TABLE
INPUTS
CLR OE LE
D
X
L
X
X
L
L
X
X
H
L
H
L
H
L
H
H
H
L
L
X
X
H
X
X
OUTPUT
Q
H
L
L
H
Q0
Z
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.
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Copyright © 1993, Texas Instruments Incorporated
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