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M38510/65352BDA PDF预览

M38510/65352BDA

更新时间: 2024-11-05 11:07:59
品牌 Logo 应用领域
德州仪器 - TI 触发器锁存器
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5页 103K
描述
具有清零和预置端的双路负边沿触发式 D 型触发器 | W | 14 | -55 to 125

M38510/65352BDA 数据手册

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SN54HCT74, SN74HCT74  
DUAL D-TYPE POSITIVE-EDGE-TRIGGERED FLIP-FLOPS  
WITH CLEAR AND PRESET  
SCLS169B – DECEMBER 1982 – REVISED MAY 1997  
SN54HCT74 . . . J OR W PACKAGE  
SN74HCT74 . . . D, N, OR PW PACKAGE  
(TOP VIEW)  
Inputs Are TTL-Voltage Compatible  
Package Options Include Plastic  
Small-Outline (D), Thin Shrink  
Small-Outline (PW), and Ceramic Flat (W)  
Packages, Ceramic Chip Carriers (FK), and  
Standard Plastic (N) and Ceramic (J)  
300-mil DIPs  
1CLR  
1D  
V
CC  
2CLR  
2D  
1
2
3
4
5
6
7
14  
13  
12  
11  
1CLK  
1PRE  
1Q  
2CLK  
10 2PRE  
description  
9
8
1Q  
2Q  
2Q  
The ’HCT74 contain two independent D-type  
positive-edge-triggered flip-flops. A low level at  
the preset (PRE) or clear (CLR) inputs sets or  
resets the outputs regardless of the levels of the  
other inputs. When PRE and CLR are inactive  
(high), data at the data (D) input meeting the setup  
time requirements are transferred to the outputs  
on the positive-going edge of the clock (CLK)  
pulse. Clock triggering occurs at a voltage level  
and is not directly related to the rise time of CLK.  
Following the hold-time interval, data at the  
D input may be changed without affecting the  
levels at the outputs.  
GND  
SN54HCT74 . . . FK PACKAGE  
(TOP VIEW)  
3
2
1
20 19  
18  
2D  
1CLK  
NC  
4
5
6
7
8
NC  
17  
16  
2CLK  
1PRE  
NC  
15 NC  
14  
9 10 11 12 13  
2PRE  
1Q  
The SN54HCT74 is characterized for operation  
over the full military temperature range of –55°C  
to 125°C. The SN74HCT74 is characterized for  
operation from –40°C to 85°C.  
NC – No internal connection  
FUNCTION TABLE  
INPUTS  
OUTPUT  
PRE  
L
CLR  
CLK  
X
D
X
X
X
H
L
Q
H
L
Q
L
H
L
H
X
H
H
L
L
X
H
H
H
H
H
H
L
L
H
H
H
L
X
Q
Q
0
0
This configuration is unstable; that is, it does not  
persist when PRE or CLR returns to its inactive  
(high) level.  
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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