MC74AC163

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. Features 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 These are Pb−Free Devices VCC TC Q0 Q1 Q2 Q3 CET PE 16 15 14 13 12 11 10 9 www.onsemi.com 16 1 xxx y A WL Y WW G MARKING DIAGRAM 16 SOIC−16 D SUFFIX CASE 751B 1 xxx16yG AWLYWW = AC or ACT = 1 or 3 = Assembly Location = Wafer Lot = Year = Work Week = Pb−Free Package ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet. 12345678 *R CP P0 P1 P2 P3 CEP GND Figure 1. Pinout: 16−Lead Packages Conductors (Top View) PIN ASSIGNMENT PIN FUNCTION CEP Count Enable Parallel Input CET Count Enable Trickle Input CP Clock Pulse Inp...