GENERAL DESCRIPTION

The EM91810A/B are Tone/Pulse switchable dialer which are fabricated in CMOS technology with wide operating voltage for both tone and pulse mode, and consumes very low memory retention current in ON-HOOK state. EM91810A/B also provide SDO (serial data output) function to drive LCD driver (EM32100, EM32116, EM32117) and voice synthesizer.

FEATURES

• Tone/pulse switchable dialer.

• One 32-digit last number redial memory.

• Pulse to tone (P→T) is provided for PBX operation.

• Flash key is available.

• Minimum tone duration is 98ms or 83ms.

• Minimum intertone pause is 98ms or 83ms.

• Uses 3.579545 MHz crystal or ceramic resonator.

• Many options can be selected.

Mode (10 PPS ; 20 PPS ; Tone)

M/B ratio (40 : 60 ; 33 : 66)

Pause time (3.6s)

• Flash function (RESET)

P→T pause time (3.6s)

Flash time (600ms; 300ms; 100ms; or 80ms).

• Mixed dialing.

• Handfree function is provided for speaker phone application.

• Power on reset circuit is provided.

• Package in DIP18 or DIP20.

• SDO function that is supported to drive LCD driver (EM32100) and voice synthesizer to indicate dialing number.

• Key tone function is provided.