The 4518 is a dual BCD (Binary-Coded Decimal) up-counter IC with two synchronous 4-stage counters, each using D-type flip-flops. It supports positive or negative edge triggering, operates at 5V–18V, and has a 6 MHz typical clock frequency. With interchangeable CLOCK and ENABLE pins, it’s ideal for multistage counting and frequency division, offering high noise immunity and low power consumption in a 16-pin DIP package.
| Counter Stages | Two 4-stage synchronous counters |
|---|---|
| Supply Voltage | 5V to 18V |
| Clock Frequency | 6 MHz (typical) |
| Triggering | Positive or negative edge |
| Inputs | CLOCK, ENABLE, RESET per counter |
| Outputs | 4-bit BCD per counter |
