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5962-8684001FA

更新时间： 2024-11-27 11:07:59
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德州仪器 - TI 计数器
页数 文件大小 规格书
8页 135K
描述
同步 4 位加/减二进制计数器 | W | 16 | -55 to 125

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5962-8684001FA 数据手册

 浏览型号5962-8684001FA的Datasheet PDF文件第2页浏览型号5962-8684001FA的Datasheet PDF文件第3页浏览型号5962-8684001FA的Datasheet PDF文件第4页浏览型号5962-8684001FA的Datasheet PDF文件第5页浏览型号5962-8684001FA的Datasheet PDF文件第6页浏览型号5962-8684001FA的Datasheet PDF文件第7页 
SN54ALS191A, SN74ALS191A  
SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS  
SDAS210C – DECEMBER 1982 – REVISED JULY 1996  
SN54ALS191A . . . J PACKAGE  
SN74ALS191A . . . D OR N PACKAGE  
Single Down/Up Count-Control Line  
Look-Ahead Circuitry Enhances Speed of  
Cascaded Counters  
(TOP VIEW)  
Fully Synchronous in Count Modes  
B
V
A
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
CC  
Q
Q
Asynchronously Presettable With Load  
Control  
B
A
CLK  
RCO  
MAX/MIN  
LOAD  
C
CTEN  
D/U  
Package Options Include Plastic  
Small-Outline (D) Packages, Ceramic Chip  
Carriers (FK), and Standard Plastic (N) and  
Ceramic (J) 300-mil DIPs  
Q
C
Q
D
GND  
D
description  
SN54ALS191A . . . FK PACKAGE  
(TOP VIEW)  
The ’ALS191A are synchronous 4-bit reversible  
up/down binary counters. Synchronous counting  
operation is provided by having all flip-flops  
clocked simultaneously so that the outputs  
change coincidentally with each other when  
instructed by the steering logic. This mode of  
operation eliminates the output counting spikes  
3
2
1
20 19  
18  
CLK  
Q
4
5
6
7
8
A
RCO  
CTEN  
NC  
17  
16  
15  
14  
NC  
normally  
associated  
with  
asynchronous  
MAX/MIN  
LOAD  
D/U  
(ripple-clock) counters.  
Q
C
The outputs of the four flip-flops are triggered on  
a low-to-high-level transition of the clock (CLK)  
input if the count enable (CTEN) input is low. A  
high at CTEN inhibits counting. The direction of  
the count is determined by the level of the  
down/up (D/U) input. When D/Uislow, thecounter  
counts up, and when D/U is high, the counter  
counts down.  
9 10 11 12 13  
NC – No internal connection  
These counters feature a fully independent clock circuit. Changes at the control inputs (CTEN and D/U) that  
modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of  
the counter is dictated solely by the conditions meeting the stable setup and hold times.  
These counters are fully programmable. Each output can be preset to either level by placing a low on the LOAD  
input and entering the desired data at the data inputs. The output changes to agree with the data inputs  
independently of the level of the clock input. This feature allows the counters to be used as modulo-N dividers  
by simply modifying the count length with the preset inputs.  
CLK, D/U, and LOAD are buffered to lower the drive requirement, which significantly reduces the loading on  
(current required by) clock drivers, for long parallel words.  
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 1996, 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.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
12345678

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5962-8684001FA 替代型号

型号 品牌 替代类型 描述 数据表
5962-8869801FA TI

完全替代

 具有双时钟的同步 4 位加/减二进制计数器 | W | 16 | -55 to 125
SNJ54ALS193AW TI

完全替代

 具有双时钟的同步 4 位加/减二进制计数器 | W | 16 | -55 to 125

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