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SN74HC191

更新时间： 2024-11-01 23:03:11
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德州仪器 - TI 计数器
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4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS

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SN74HC191 数据手册

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SN54HC191, SN74HC191  
4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS  
SCLS121B – DECEMBER 1982 – REVISED MAY 1997  
SN54HC191 . . . J OR W PACKAGE  
SN74HC191 . . . D OR N PACKAGE  
Single Down/Up Count-Control Line  
Look-Ahead Circuitry Enhances Speed of  
Cascaded Counters  
(TOP VIEW)  
B
V
A
Fully Synchronous in Count Modes  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
CC  
Q
B
A
Asynchronously Presettable With Load  
Control  
Q
CLK  
CTEN  
D/U  
RCO  
Package Options Include Plastic  
Small-Outline (D) and Ceramic Flat (W)  
Packages, Ceramic Chip Carriers (FK), and  
Standard Plastic (N) and Ceramic (J)  
300-mil DIPs  
12 MAX/MIN  
11  
10  
9
Q
Q
LOAD  
C
D
C
D
GND  
description  
SN54HC191 . . . FK PACKAGE  
(TOP VIEW)  
The ’HC191 are 4-bit synchronous, reversible,  
up/down binary counters. Synchronous counting  
operation is provided by having all flip-flops  
clocked simultaneously so that the outputs  
change coincident with each other when  
instructed by the steering logic. This mode of  
operation eliminates the output counting spikes  
normally associated with asynchronous (ripple-  
clock) counters.  
3
2
1
20 19  
18  
CLK  
RCO  
NC  
Q
4
5
6
7
8
A
CTEN  
NC  
17  
16  
15 MAX/MIN  
14  
9 10 11 12 13  
D/U  
LOAD  
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, it counts down.  
NC – No internal connection  
These counters feature a fully independent clock circuit. Change at the control (CTEN and D/U) inputs that  
modifies 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 condition meeting the stable setup and hold times.  
These counters are fully programmable; that is, each of the outputs can be preset to either level by placing a  
low on the load (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 CLK. This feature allows the counters to be used as modulo-N  
dividers by simply modifying the count length with the preset inputs.  
Two outputs are available to perform the cascading function: ripple clock (RCO) and maximum/minimum  
(MAX/MIN) count. MAX/MIN produces a high-level output pulse with a duration approximately equal to one  
complete cycle of the clock while the count is zero (all outputs low) counting down, or maximum (9 or 15)  
counting up. RCO produces a low-level output pulse under those same conditions, but only while CLK is low.  
The counters can be easily cascaded by feeding RCO to CTEN of the succeeding counter if parallel clocking  
is used, or to CLK if parallel enabling is used. MAX/MIN can be used to accomplish look ahead for high-speed  
operation.  
The SN54HC191 is characterized for operation over the full military temperature range of –55°C to 125°C. The  
SN74HC191 is characterized for operation from –40°C to 85°C.  
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  
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  
1234567...10

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SN74HC191 替代型号

型号 品牌 替代类型 描述 数据表
SN54HC191 TI

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