The 4521 is a CMOS 24-stage frequency divider IC with a single binary counter, ideal for long-duration timing and frequency division. Operating at 3V–18V, it features a built-in oscillator (with external RC components), a maximum clock frequency of 7 MHz, and high noise immunity. Commonly used in timers, clocks, and low-frequency signal generation.
| Counter | Single 24-bit binary counter |
|---|---|
| Supply Voltage | 3V to 18V |
| Clock Frequency | 7 MHz (typical) |
| Outputs | 6 divider outputs (2⁸, 2¹⁶, 2²⁰, 2²¹, 2²², 2²³) |
