CD74ACT161 - Texas Instruments

CD74ACT161 4-BIT SYNCHRONOUS BINARY COUNTERS

ordering information SCHS298B – APRIL 2000 – REVISED MARCH 2003 CD54ACT161 . . . F PACKAGE CD74ACT161 . . . E OR M PACKAGE (TOP VIEW) CLR 1 CLK 2 A3 B4 C5 D6 ENP 7 GND 8 16 VCC 15 RCO 14 QA 13 QB 12 QC 11 QD 10 ENT 9 LOAD The ’ACT161 devices are 4-bit binary counters. These synchronous, presettable counters feature an internal carry look-ahead for applic.

Features

tput counting spikes that normally are associated with synchronous (ripple-clock) counters. A buffered clock (CLK) input triggers the four flip-flops on the rising (positive-going) edge of the clock waveform. These devices are fully programmable; that is, they can be preset to any number between 0 and 9 or 15. Presetting is synchronous; therefore, setting up a low level at the load input disables the counter and causes the outputs to agree with the setup data after the next clock pulse, regardless of the levels of the enable inputs. The clear function is asynchronous. A low level at the clear .