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SN54HC191FK PDF预览

SN54HC191FK

更新时间： 2024-09-12 23:03:03
品牌 Logo 应用领域
德州仪器 - TI 计数器触发器逻辑集成电路输出元件
页数 文件大小 规格书
10页 158K
描述
4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS

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中文翻译

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SN54HC191FK 技术参数

是否Rohs认证：不符合生命周期：Obsolete
零件包装代码：QFN包装说明：CERAMIC, CC-20
针数：20Reach Compliance Code：not_compliant
HTS代码：8542.39.00.01风险等级：5.4
Is Samacsys：N其他特性：RCO OUTPUT
计数方向：BIDIRECTIONAL系列：HC/UH
JESD-30 代码：S-CQCC-N20长度：8.89 mm
负载电容（CL）：50 pF负载/预设输入：YES
逻辑集成电路类型：BINARY COUNTER最大频率@ Nom-Sup：14000000 Hz
最大I（ol）：0.0052 A工作模式：SYNCHRONOUS
位数：4功能数量：1
端子数量：20最高工作温度：125 °C
最低工作温度：-55 °C封装主体材料：CERAMIC, METAL-SEALED COFIRED
封装代码：QCCN封装等效代码：LCC20,.35SQ
封装形状：SQUARE封装形式：CHIP CARRIER
峰值回流温度（摄氏度）：NOT SPECIFIED电源：2/6 V
传播延迟（tpd）：288 ns认证状态：Not Qualified
座面最大高度：2.03 mm子类别：Counters
最大供电电压 (Vsup)：6 V最小供电电压 (Vsup)：2 V
标称供电电压 (Vsup)：5 V表面贴装：YES
技术：CMOS温度等级：MILITARY
端子形式：NO LEAD端子节距：1.27 mm
端子位置：QUAD处于峰值回流温度下的最长时间：NOT SPECIFIED
触发器类型：POSITIVE EDGE宽度：8.89 mm
最小 fmax：16 MHzBase Number Matches：1

SN54HC191FK 数据手册

 浏览型号SN54HC191FK的Datasheet PDF文件第2页浏览型号SN54HC191FK的Datasheet PDF文件第3页浏览型号SN54HC191FK的Datasheet PDF文件第4页浏览型号SN54HC191FK的Datasheet PDF文件第5页浏览型号SN54HC191FK的Datasheet PDF文件第6页浏览型号SN54HC191FK的Datasheet PDF文件第7页 
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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