CD74HC191M集成电路（IC）的计数器除法器规格书PDF中文资料

厂商型号	CD74HC191M
参数属性	CD74HC191M 封装/外壳为16-SOIC（0.154"，3.90mm 宽）；包装为卷带（TR）剪切带（CT）Digi-Reel® 得捷定制卷带；类别为集成电路（IC）的计数器除法器；产品描述：IC BCD UP/DWN COUNT PREST 16SOIC
功能描述	SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL
丝印标识	HC191M
封装外壳	SOIC / 16-SOIC（0.154"，3.90mm 宽）
文件大小	1.01056 Mbytes
页面数量	35 页
生产厂商	TI
中文名称	德州仪器
网址	网址
数据手册	下载地址一下载地址二到原厂下载
更新时间	2025-10-12 10:20:00
人工找货	CD74HC191M价格和库存，欢迎联系客服免费人工找货

2-V to 6-V VCC Operation (’HC190, 191)

4.5-V to 5.5-V VCC Operation (’HCT191)

Wide Operating Temperature Range of

−55°C to 125°C

Synchronous Counting and Asynchronous

Two Outputs for n-Bit Cascading

Look-Ahead Carry for High-Speed Counting

Balanced Propagation Delays and

Transition Times

Standard Outputs Drive Up To 15 LS-TTL

Loads

Significant Power Reduction Compared to

LS-TTL Logic ICs

description/ordering information

The CD54/74HC190 are asynchronously presettable BCD decade counters, whereas the CD54/74HC191 and

CD54/74HCT191 are asynchronously presettable binary counters.

Presetting the counter to the number on preset data inputs (A−D) is accomplished by a low asynchronous

parallel load (LOAD) input. Counting occurs when LOAD is high, count enable (CTEN) is low, and the down/up

(D/U) input is either high for down counting or low for up counting. The counter is decremented or incremented

synchronously with the low-to-high transition of the clock.