异步置数4位同步二进制加减计数器

The AiP74HC/HCT191 is an asynchronously presettable 4-bit binary up/down counter. It contains four master/slave flip-flops with internal gating and steering logic to provide asynchronous preset and synchronous count-up and count-down operation. •Input levels:\n• For AiP74HC191: CMOS level\n• For AiP74HCT191: TTL level\n•Synchronous reversible counting\n•Asynchronous parallel load\n•Count enable control for synchronous expansion\n•Single up/down control input\n•Specified from -40℃ to +125℃\n•Packaging information: DIP16/SOP16/TSSOP16;

I-CORE

中微爱芯

HIGH SPEED CMOS LOGIC

文件：292.5 Kbytes 页数：10 Pages

TI

德州仪器

SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL

文件：614.22 Kbytes 页数：26 Pages

TI

德州仪器

SYNCHORONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL

文件：1.23656 Mbytes 页数：31 Pages

TI

德州仪器