EM91420 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

1

* This specification are subject to be changed without notice.

10.1.1997

GENERAL DESCRIPTION

The EM91420 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with

20-set memories. The EM91420 series provides necessary functions of telephone set for application in any

environment, such as Pulse dialing, Tone (DTMF) dialing, Handfree dialing, keying tone ,and lock functions.

The lock function is designed to inhibit toll dialing operation. Beside this, melody generator, ring detector and

SDO (Serial Data Output) functions are provided in advance version. Melody generator will output dual-tone

music in line hold duration. Ring detector can prevent illegal dialing from pocket dialer. The SDO 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 ).

FEATURES

• Tone/Pulse switchable.

• Adding resistor on keyboard scan pin that can select many telephone specifications, such as : Pulse rate,

M/B ratio, Flash time, lock dialing functions.

• SDO function supports LCD driver and voice synthesizer to indicate dialing numbers.

• Line hold function is designed for stopping conversation temporality.

• Melody generator provides music on hold function.

• Lock function provides conventionality key lock and password lock operations.

• Ring detector is designed to prevent illegal dialing from pocket dialer.

• 20-set three touch repertory memory, each one can hold data up to 16 digits.

• A 32-digit LNB (last number) redial memory.

• Keytone function provides rapidly keying recognition.

• Handfree function provides on-hook dialing and speakerphone application.

• Pause and P-T time are fixed to 3.6 seconds.

• Tone duration and inter-tone pause time are fixed to 98 ms.

• Using 3.579545 MHz crystal or ceramic resonator.

• Package forms: PDIP, skinny.

ORDERING INFORMATION

Versions list and function outline

VERSION

LNB

KT

HOLD(music)

LOCK

HF

SDO(LCD)

PDP

EM91420A

√

√

√

√

EM91420B

√

√

√

√

√

EM91420C

√

√

√

√

√

√

EM91420D

√

√

√

√

√

√

√

Note : PDP = Pocket Dialer Prevented

EM91420 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR