W91590B データシートの表示（PDF） - Winbond

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W91590B

24-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE, HOLD AND LOCK FUNCTIONS

Winbond 

W91590 SERIES

Pin Description, continued

SYMBOL 22-PIN

DRS

-

24-PIN

-

28-PIN

21

I/O

FUNCTION

I Dial rate selection.

This pin is pulled to VDD by an internal

resistor.

DRS

MODE

PIN

TONE/PULSE

VDD

Pulse

1 Floating

Pulse

VSS

Tone

VDD

Pulse

2 Floating

Pulse

VSS

Tone

DIAL

RATE

M/B

10 ppS 2:3

10 ppS 1:2

10 ppS 1:2

20 ppS 1:2

BLOCK DIAGRAM

ROW

(R1 to R5)

KEYBOARD

INTERFACE

COLUNM

(C1 to C8)

DTMF

D/A CONVERTER

HKS

LOCK

MODE

READ/WRITE

COUNTER

RAM

XT

XT

SYSTEM CLOCK

GENERATOR

DRS

HFI

CONTROL

LOGIC

PULSE

CONTROL

LOGIC

KT

T/P MUTE

HPM MUTE

HFO

DP/C9

LOCATION

LATCH

ROW & COLUMN

PROGRAMMABLE

COUNTER

DATA LATCH

& DECODER

Publication Release Date: July 1995

-5-

Revision A3

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