The HT9312/3 series are CMOS tone/pulse dialer ICs for telecommunication systems. They support a variety of dialing specifications through resistor option matrices and offer features such as low standby current, keytone function, hand‑free control, and LCD display interface.
The document includes detailed pin assignments, keyboard matrix operation, electrical characteristics, and package options (18‑28 pin DIP/SDIP). It also lists absolute maximum ratings and typical application circuits for integrating the device into telephone equipment.
| Operating voltage | 2.0 V ~ 5.5 V |
|---|---|
| Key‑in debounce time | 20 ms |
The HT9312/3 series operates from 2.0 V to 5.5 V.
The key‑in debounce time is specified as 20 ms.