IL91210E Datasheet (IK Semiconductor)

IL91210E, Tone/Pulse Dialer

Pin No.

1 2 3 4 5 Designation R1 R2 R3 R4 HK Hook switch input.

This inverter input pin detects the state of the hook switch contact.

“Off Hook” is represented by a GND condition.

“On Hook” is represented by a VCC condition.

Make/Break Ratio Select Input.

This input allows selection of the Make/Brea

TECHNICAL DATA IL91210E Tone/Pulse Dialer High-Performance Silicon-Gate CMOS The IL91210E is a single-chip, silicon gate, CMOS integrated circuit with an on-chip oscillator for a 3.58 MHz crystal or ceramic resonator.

It provides dialing pulse (DP) or dual tone multi-frequency (DTMF) dialing.

A standard 4x4 matrix keyboard can be used to support either DP or DTMF modes.

Up to 32 digits can be saved in the on-chip RAM for reading.

In the DTMF mode, minimum tone duration and minimum intertone pa

IL91210E Features

* wever, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this