IL91531 Datasheet (IK Semiconductor) - Parallel Input Tone/Pulse Dialer

IL91531, Parallel Input Tone/Pulse Dialer

Pin No.

Designation 1 MODE DESCRIPTION Tone mode select input.

When this input is high, the tone output and ASK output are normal.

When this input is low, a DTMF signal will be generated continuously and any new input data will be ignored.

This input affects the tone output mode only.

Latch input.

TECHNICAL DATA IL91531 PARALLEL INPUT TONE/PULSE DIALER High-Performance Silicon-Gate CMOS The IL91531 provides a 4-bit data input and a handshaking signal to serve as microcomputer interfaces.

Under microcomputer control the IL91531 generates both a DTMF signal and a pulse output for telephone dialing.

All necessary dual-tone frequencies and dial pulse outputs are derived from the widely used TV crystal standard, providing high accuracy and stability.

The required sinusoidal waveform for indi