The EM91220 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with 20-set memories. The EM91220 series provides necessary functions of telephone set for application in any environment, such as Pulse dialing, Tone (DTMF) dialing, Handfree dialing, keying tone , mute and pulse mute functions. Beside this, SDO (Serial Data Output) functions is provided in advance version that is designed to drive LCD driver and voice synthesizer. In this application, the dialing numbers can be displayed on LCD screen with EM32100 ( or EM32116 ).
The EM91220 series provides a tone/pulse switchable dialer that can operate from 2.0 V to 5.5 V and draws as little as 0.15 mA in pulse mode. It supports up to 20 sets of 16‑digit repertory memory, a 32‑digit LNB redial memory and a 32‑digit SAVE redial memory. An optional SDO (Serial Data Output) function can drive an LCD driver or voice synthesizer to display or announce dialed numbers.
The device includes a full set of pins for keyboard scanning, tone/pulse mute, hand‑free operation, DTMF output and power supply. It is offered in PDIP (skinny) and 42‑lead SDIP packages with detailed mechanical dimensions provided.
| Operating voltage | 2.0 V to 5.5 V |
|---|---|
| Operating current (Pulse) | 0.15 mA typical |
| Operating current (Tone) | 0.30 mA typical |
| Memory sets | 20 sets of 16‑digit memory |
| LNB redial memory capacity | 32 digits |
| SAVE redial memory capacity | 32 digits |
| Crystal frequency | 3.579545 MHz |
It operates from 2.0 V to 5.5 V.
The series supports 20 sets of repertory memory, each holding up to 16 digits.
The optional SDO (Serial Data Output) function provides serial data to drive an LCD driver or voice synthesizer.
Typical current in tone mode is about 0.30 mA.