EM91440 데이터 시트보기 (PDF) - ELAN Microelectronics

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EM91440

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR

ELAN Microelectronics 

EM91440 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

TIMING DIAGRAM

HKS

KEY IN

KT

XMUTE

HDO

SDO

PO

DTMF

OSC.

2

3

Tdb

Tkt

Tm

Tidp

T T TT

Tidp

b m bm

Tdly

Figure 1. Pulse mode operating timing

Hi-impedance

HKS

KEY IN

KT

XMUTE

HDO

SDO

PO

DTMF

OSC.

2

3

Tdb

Td

Titp

Figure 2. DTMF mode operating timing

* This specification are subject to be changed without notice.

Titp

Hi-impedance

10.1.1997 14

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