MC74F161A

SYNCHRONOUS PRESETTABLE BINARY COUNTER The MC74F161A and MC74F163A 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 MC74F161A has an asynchronous Master Reset input that overrides all other inputs and forces the outputs LOW. The MC74F163A 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 Frequency of 120 MHz CONNECTION DIAGRAM 16 VCC 16 TC 15 Q0 14 Q1 13 Q2 12 Q3 11 CET 10 PE 9 MC74F161A MC74F163A SYNCHRONOUS PRESETTABLE BINARY COUNTER FAST™ SHOTTKY TTL J SUFFIX CERAMIC CASE 620-09 1 16 1 1 *R 2 CP 3 P0 4 P1 5 P2 6 P3 7 CEP 8 GND N SUFFIX PLASTIC CASE 648-08 *MR for MC74F161A *SR for MC74F163A 16 1 D SUFFIX SOIC CASE 751B-03 FUNCTION TABLE SR L H H H H PE X L H H H CET X X H L X CEP X X H X L ACTION ON THE RISING CLOCK EDGE ( Reset (Clear) Load (Pn Qn) ) ORDERING INFORMATION MC74FXXXAJ Ceramic MC74FXXXAN Plastic MC74FXXXAD SOIC Count (Increment) No Change (Hold) No Change (Hold) LOGIC SYMBOL 9 3 4 5 6 H = HIGH Voltage Level; L = LOW Voltage Level; X = Don’t Care STATE DIAGRAM 0 15 14 13 1 2 3 4 5 6 7 11 10 9 8 7 10 2 PE CEP CET CP *R P0 P1 P2 P3 TC 15 Q...