W91560 データシートの表示（PDF） - Winbond

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W91560

3-MEMORY TONE/PULSE DIALER WITH SAVE, KEYTONE, LOCK AND HANDFREE FUNCTIONS

Winbond 

W91560N SERIES

PIN DESCRIPTION

SYMBOL 18-PIN 20-PIN I/O

FUNCTION

Column-

Row Inputs

1−4

&

15−18

XT

7

XT

8

T/P MUTE

9

MODE

13

HKS

10

1−4

&

17−20

7

8

9

15

12

I The keyboard input is compatible with a standard 5 x 5

keyboard, an inexpensive single contact (Form A)

keyboard, and electronic input.

In normal operation, any single button can be pushed to

produce dual tone, pulses, or function. Activation of two

or more buttons will result in no response except for

single tone.

I A built-in inverter provides oscillation with an

inexpensive 3.579545 MHz crystal. The oscillator

ceases when a keypad input is not sensed. The crystal

frequency deviation is 0.02%.

O Crystal oscillator output pin.

O The T/P MUTE is a conventional CMOS N-channel

open drain output.

The output transistor is switched on low level during

dialing sequence (both pulse and tone mode).

Otherwise, it is switched off.

I Pulling mode pin to VSS places dialer in tone mode.

Pulling mode pin to VDD places dialer in pulse mode

with M/B ratio of 40:60 (10 ppS, except for W91560BN,

which is 20 ppS).

Leaving mode pin floating places dialer in pulse mode

with M/B ratio of 33.3:66.7 (10 ppS, except for

W91560BN, which is 20 ppS).

I The HKS (hook switch) input is used to sense whether

the handset is on-hook or off-hook.

In on-hook state, HKS = 1: chip is in sleeping mode, no

operation.

In off-hook state, HKS = 0: chip is enabled for normal

operation.

HKS pin is pulled to VDD by internal resistor.

KT

5

5

O The key tone output is a conventional CMOS inverter.

(except for (except for

W91561LN) W91561ALN)

The key tone is generated when any valid key is

pressed; the KT pin generates a 1.2 KHz square wave at

35 mS. When no key is pressed, the KT pin remains in

low state.

Publication Release Date: February 1996

-3-

Revision A1

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