Motorola MC74AC190 Up/Down Counter with Preset and Ripple Clock Data Handbook
Summary
The MC74AC190 is a versatile reversible BCD decade counter, engineered for reliable synchronous counting and asynchronous presetting. Ideal for developing programmable dividers and complex multi-stage counters, it features specialized inputs for up/down control, count enabling, and parallel data loading. This comprehensive guide details the device's functional operation, required timing characteristics, and advanced configurations (ripple vs. parallel clock) to ensure seamless integration into your digital logic design. Perfect for hardware engineers and electronics designers building precise counting circuits.
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UP/DOWN COUNTER WITH PRESET AND RIPPLE CLOCK
The MC74AC190 is a reversible BCD (8421) decade counter which features synchronous counting and asynchronous presetting. The preset feature allows the MC74AC190 to be used in programmable dividers. The Count Enable input, the Terminal Count output and the Ripple Clock output make possible a variety of methods of implementing multistage counters. In the counting modes, state changes are initiated by the rising edge of the clock. High-Speed — 120 MHz Typical Count Frequency Synchronous Counting Asynchronous Parallel Load
N SUFFIX
Cascadable
CASE 648-08
Outputs Source/Sink 24 m A
PLASTIC
VCC P0 CP RC TC PL P2 P3
D SUFFIX CASE 751B-05 PLASTIC
P1 Q1 Q0 CE U/D Q2 Q3 GND
LOGIC SYMBOL
PIN NAMES CE Count Enable Input
CP Clock Pulse Input PL P0 P1 P2 P3 U/D
P0–P3 Parallel Data Inputs RC
PL Asynchronous Parallel Load Input CE
U/D Up/Down Count Control Input CP TC
Q0–Q3 Flip-Flop Outputs
RC Ripple Clock Output
TC Terminal Count Output
FACT DATA 5-1
Page Summary Contents For Motorola MC74AC190 Up/Down Counter with Preset and Ripple Clock Data Handbook
Manual Details
| Brand | Motorola |
|---|---|
| Pages | 8 |
| File Size | 213.14 KB |
| Published | June 01, 2026 |
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Frequently Asked Questions
What is the highest count frequency of the MC74AC190?
The typical count frequency for the High-Speed model is 120 MHz.
How does the RC output simplify multi-stage counter design?
It simplifies designs because only the first stage needs to be inhibited by applying a HIGH signal on CE to prevent the RC output pulse.
Can I use the MC74AC190 as a programmable divider?
Yes, the preset feature allows it to be used in programmable dividers. The input data is loaded via PL (P-P).
What does a HIGH signal on the CE input do?
A HIGH signal on the CE input inhibits counting.