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SN74BCT29843

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德州仪器 - TI 锁存器输出元件
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5页 74K
描述
9-BIT BUS-INTERFACE D-TYPE LATCH WITH 3-STATE OUTPUTS

SN74BCT29843 数据手册

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SN74BCT29843  
9-BIT BUS-INTERFACE D-TYPE LATCH  
WITH 3-STATE OUTPUTS  
SCBS022C – FEBRUARY 1989 – REVISED NOVEMBER 1993  
DW OR NT PACKAGE  
(TOP VIEW)  
BiCMOS Process With CMOS Inputs and  
TTL Outputs Substantially Reduces  
Standby Current  
OE  
1D  
2D  
3D  
4D  
5D  
6D  
7D  
8D  
V
CC  
1
2
3
4
5
6
7
8
9
24  
Input Has 50 k  
Package Options Include Plastic  
Small-Outline (DW) Packages and Standard  
Plastic 300-mil DIPs (NT)  
23 1Q  
22 2Q  
21 3Q  
20 4Q  
19 5Q  
18 6Q  
17 7Q  
16 8Q  
15 9Q  
14 PRE  
13 LE  
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.  
9D 10  
CLR 11  
GND 12  
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.  
FUNCTION TABLE  
INPUTS  
OUTPUT  
Q
PRE  
L
CLR  
X
OE  
L
LE  
X
D
X
X
L
H
L
H
L
L
X
H
H
L
H
H
L
L
H
H
L
H
X
X
H
H
H
L
Q
0
X
X
H
X
Z
Copyright 1993, 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  

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