器件名称:
MC74ACT161N
功能描述:
SYNCHRONOUS PRESETTABLE BINARY COUNTER
文件大小:
309.43KB 共12页
简 介:
MC74AC161 MC74ACT161 MC74AC163 MC74ACT163 Synchronous Presettable Binary Counter The MC74AC161/74ACT161 and MC74AC163/74ACT163 are high-speed synchronous modulo-16 binary counters. They are synchronously presettable for application in programmable dividers and have two types of Count Enable inputs plus a Terminal Count output for versatility in forming synchronous multistage counters. The MC74AC161/74ACT161 has an asynchronous Master Reset input that overrides all other inputs and forces the outputs LOW. The MC74AC163/ 74ACT163 has a Synchronous Reset input that overrides counting and parallel loading and allows the outputs to be simultaneously reset on the rising edge of the clock. Synchronous Counting and Loading High-Speed Synchronous Expansion Typical Count Rate of 125 MHz Outputs Source/Sink 24 mA ′ACT161 and ′ACT163 Have TTL Compatible Inputs VCC 16 TC 15 Q0 14 Q1 13 Q2 12 Q3 11 CET 10 PE 9 D SUFFIX CASE 751B-05 PLASTIC N SUFFIX CASE 648-08 PLASTIC SYNCHRONOUS PRESETTABLE BINARY COUNTER LOGIC SYMBOL 1 *R 2 CP 3 P0 4 P1 5 P2 6 P3 7 CEP 8 GND PE CEP CET CP *R P0 P1 P2 P3 TC Q0 Q1 Q2 Q3 PIN NAMES CEP CET CP MR SR P0–P3 PE Q 0 –Q 3 TC Count Enable Parallel Input Count Enable Trickle Input Clock Pulse Input (′161) Asynchronous Master Reset Input (′163) Synchronous Reset Input Parallel Data Inputs Parallel Enable Input Flip-Flop Outputs Terminal Count Output *MR for ′161 *SR for ′163 FACT DATA 5-1 MC74AC161 MC74ACT161 MC74AC163 MC74ACT163 FUNCTIONAL DESCRIPTION Th……
