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SN54HCT574J PDF预览

SN54HCT574J

更新时间: 2024-10-30 23:03:03
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德州仪器 - TI 触发器输出元件
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6页 118K
描述
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS

SN54HCT574J 数据手册

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SN54HCT574, SN74HCT574  
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS  
WITH 3-STATE OUTPUTS  
SCLS177C – MARCH 1984 – REVISED MAY 1997  
SN54HCT574 . . . J OR W PACKAGE  
SN74HCT574 . . . DW, N, OR PW PACKAGE  
(TOP VIEW)  
Inputs Are TTL-Voltage Compatible  
High-Current 3-State Noninverting Outputs  
Drive Bus Lines Directly or up to 15 LSTTL  
Loads  
OE  
1D  
2D  
3D  
4D  
5D  
6D  
7D  
8D  
V
CC  
1Q  
2Q  
1
2
3
4
5
6
7
8
9
20  
19  
18  
Bus-Structured Pinout  
Package Options Include Plastic  
Small-Outline (DW), Thin Shrink  
Small-Outline (PW), and Ceramic Flat (W)  
Packages, Ceramic Chip Carriers (FK), and  
Standard Plastic (N) and Ceramic (J)  
300-mil DIPs  
17 3Q  
16 4Q  
15 5Q  
14 6Q  
13  
7Q  
12 8Q  
description  
GND 10  
11 CLK  
These octal edge-triggered D-type flip-flops  
feature 3-state outputs designed specifically for  
bus driving. They are particularly suitable for  
implementing buffer registers, I/O ports,  
bidirectional bus drivers, and working registers.  
SN54HCT574 . . . FK PACKAGE  
(TOP VIEW)  
3
2
1
20 19  
18  
The eight flip-flops enter data on the low-to-high  
transition of the clock (CLK) input.  
2Q  
3Q  
4Q  
3D  
4D  
5D  
6D  
7D  
4
5
6
7
8
17  
16  
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 the  
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 interface or pullup components.  
15 5Q  
14  
9 10 11 12 13  
6Q  
OE does not affect the internal operations 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 SN54HCT574 is characterized for operation over the full military temperature range of –55°C to 125°C. The  
SN74HCT574 is characterized for operation from –40°C to 85°C.  
FUNCTION TABLE  
(each flip-flop)  
INPUTS  
OUTPUT  
Q
OE  
L
CLK  
D
H
L
H
L
L
L
H or L  
X
X
X
Q
0
H
Z
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Copyright 1997, Texas Instruments Incorporated  
UNLESS OTHERWISE NOTED this document contains PRODUCTION  
DATA information 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.  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  

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