M74HC161 - STMicroelectronics

M74HC161 SYNCHRONOUS PRESETTABLE 4-BIT COUNTER

s The M74HC161 is an high speed CMOS b SYNCHRONOUS 4-BIT BINARY O PRESETTABLE COUNTER fabricated with silicon - gate C2MOS technology. t(s) The CLOCK input is active on the rising edge. Both LOAD and CLEAR inputs are active LOW. c Presetting is synchronous on the rising edge of u the clock, the function is cleared asynchronously. DIP SOP TSSOP O.

Features

hich facilities easy implementation of N-bit counters without using external gates. All inputs are equipped with protection circuits against static discharge and transient excess voltage. Obsolete Prod PIN CONNECTION AND IEC LOGIC SYMBOLS July 2001 1/12 M74HC161 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 1 CLEAR Asynchronous Master Reset 2 CLOCK Clock Input (LOW to HIGH, Edge-triggered) 3, 4, 5, 6 A, B, C, D Data Inputs 7 PE Count Enable Input 10 TE Count Enable Carry Input 9 LOAD Parallel Enable Input 14, 13, 12, 11 ) 15 t(s 8 c.