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SN54BCT573

更新时间: 2024-11-05 22:53:39
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德州仪器 - TI 锁存器输出元件
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5页 76K
描述
OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS

SN54BCT573 数据手册

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SN54BCT573, SN74BCT573  
OCTAL TRANSPARENT D-TYPE LATCHES  
WITH 3-STATE OUTPUTS  
SCBS071A – AUGUST 1990 – REVISED NOVEMBER 1993  
SN54BCT573 . . . J OR W PACKAGE  
SN74BCT573 . . . DW OR N PACKAGE  
(TOP VIEW)  
State-of-the-Art BiCMOS Design  
Significantly Reduces I  
CCZ  
ESD Protection Exceeds 2000 V Per  
MIL-STD-883C, Method 3015; Exceeds  
200 V Using Machine Model (C = 200 pF,  
R = 0)  
OE  
1D  
2D  
3D  
4D  
5D  
6D  
7D  
8D  
V
CC  
1
2
3
4
5
6
7
8
9
20  
19  
18  
17  
16  
15  
14  
1Q  
2Q  
3Q  
4Q  
5Q  
6Q  
Full Parallel Access for Loading  
Package Options Include Plastic  
Small-Outline (DW) Packages, Ceramic  
Chip Carriers (FK) and Flatpacks (W), and  
Plastic and Ceramic 300-mil DIPs (J, N)  
13 7Q  
8Q  
11 LE  
12  
description  
GND 10  
These 8-bit latches feature 3-state outputs  
designed specifically for driving highly capacitive  
or relatively low-impedance loads. They are  
particularly suitable for implementing buffer  
registers, I/O ports, bidirectional bus drivers, and  
working registers.  
SN54BCT573 . . . FK PACKAGE  
(TOP VIEW)  
3
2
1
20 19  
18  
4
5
6
7
8
The eight latches of the BCT573 are transparent  
D-type latches. While the latch-enable (LE) input  
ishigh, theQoutputswillfollowthedata(D)inputs.  
When the latch enable is taken low, the Q outputs  
will be latched at the logic levels that were set up  
at the D inputs.  
3D  
4D  
5D  
6D  
7D  
2Q  
3Q  
4Q  
5Q  
6Q  
17  
16  
15  
14  
9 10 11 12 13  
A buffered output-enable (OE) input can be used  
to place the eight outputs in either a normal logic  
state (high or low logic levels) 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 pullup components.  
The output enable (OE) does not affect the internal operations of the latches. Old data can be retained or new  
data can be entered while the outputs are in the high-impedance state.  
The SN54BCT573 is characterized for operation over the full military temperature range of 55°C to 125°C. The  
SN74BCT573 is characterized for operation from 0°C to 70°C.  
FUNCTION TABLE  
(each latch)  
INPUTS  
OUTPUT  
Q
OE  
L
LE  
H
H
L
D
H
L
H
L
L
L
X
X
Q
0
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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