W91473D datasheet(3/20 Pages) WINBOND

Part #	W91473D

Description	14-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE AND LOCK FUNCTION

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Manufacturer	WINBOND [Winbond]

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W91473 SERIES

Publication Release Date: February 1995

- 3 -

Revision A3

PIN DESCRIPTION

SYMBOL

22-PIN

24-PIN

28-PIN

I/O

FUNCTION

Column-

Row

Inputs

1

−7

&

18

−22

1

−7

&

20

−24

1

−8

&

24

−28

I

The keyboard input may be used with

either the standard 7

× 5 keyboard or an

inexpensive single contact (form A)

keyboard. Electronic input with

µC can

also be used.

A valid key entry is defined by a single

row being connected to a single column.

XT, XT

9, 10

11, 12

I, O

A built-in inverter provides oscillation with

an inexpensive 3.579545 MHz crystal or

ceramic resonator.

T/P

MUTE

11

13

O

The T/P MUTE is a conventional CMOS

N-channel open drain output. The output

transistor is switched on during pulse and

tone mode dialing sequence and flash

break. Otherwise, it is switched off.

DP

13

15

17

O

N-channel open drain dialing pulse output

(Figure 1).

Flash key causes DP to go active when in

pulse mode and tone mode.

MODE

15

17

19

I

Pulling mode pin to VSS places the dialer

in tone mode.

Pulling mode pin to VDD places the dialer

in pulse mode (10 ppS, M/B = 2:3).

Leaving mode pin floating places the

dialer in pulse mode (10 ppS, M/B = 1:2).

HKS

12

14

16

I

Hook switch input.

HKS = 1: On-hook state. Chip in sleep

mode, no operation.

HKS = 0: Off-hook state. Chip enabled for

normal operation.

HKS pin is pulled to VDD by internal

resistor.

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