W91331N Ver la hoja de datos (PDF) - Winbond

Número de pieza

componentes Descripción

Fabricante

W91331N

TONE/PULSE DIALER WITH HANDFREE LOCK AND KEY TONE FUNCTIONS

Winbond 

W91330N SERIES

Pin Description, continued

SYMBOL 18-PIN

20-PIN I/O

FUNCTION

LOCK

5

5

I The function of this terminal is to prevent "0" dialing

(W91330LN (W91330ALN

only)

only)

and "9" dialing under PABX system long distance

call control. When the first key input after reset is 0

or 9, all key inputs, including the 0 or 9 key, become

invalid and the chip generates no output. The

telephone is reinitialized by a reset.

LOCK PIN

Floating

VDD

VSS

FUNCTION

Normal dialing mode

"0," "9" dialing inhibited

"0" dialing inhibited

BLOCK DIAGRAM

ROW

(R1 to R4, Vx)

COLUMN

(C1 to C4)

KEYBOARD

INTERFACE

DTMF

D/A

CONVERTER

XT XT

SYSTEM CLOCK

GENERATOR

HKS

HFI

READ/WRITE

COUNTER

CONTROL

LOGIC

LOCATION

LATCH

RAM

PULSE

CONTROL

LOGIC

ROW & COLUMN

PROGRAMMABLE

COUNTER

DATA LATCH

& DECODER

LOCK

MODE

KT

T/P MUTE

DP

HFO

Publication Release Date: May 1997

-5-

Revision A2

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