The MC74AC190 is a reversible BCD (8421) decade counter which features synchronous counting and asynchronous presetting.
The Motorola MC74AC190 is a reversible BCD (8421) decade counter featuring synchronous counting and asynchronous presetting. It includes four edge-triggered flip-flops with internal gating logic to support individual preset, count-up, and count-down operations.
The device provides two types of outputs for overflow/underflow indication: the Terminal Count (TC) output and the Ripple Clock (RC) output. These features facilitate various implementations of multistage counters, including programmable dividers and cascaded configurations.
| Count Frequency (Typical) | 120 MHz |
|---|---|
| Operating Temperature Range | -40 to +85 °C |
| Output Current (Source/Sink) | 24 mA |
It is a synchronous up/down BCD decade counter.
When the Parallel Load (PL) input is LOW, information on P3-P0 inputs is loaded into the counter.
It goes HIGH when the circuit reaches zero in count-down mode or 9 in count-up mode.