W91473B Ver la hoja de datos (PDF) - Winbond

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Fabricante

W91473B

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

Winbond 

W91473 SERIES

PIN DESCRIPTION

SYMBOL

Column-

Row

Inputs

22-PIN

1−7

&

18−22

24-PIN

1−7

&

20−24

XT, XT

9, 10

T/P

11

MUTE

9, 10

11

DP

13

15

MODE

15

17

HKS

12

14

28-PIN

1−8

&

24−28

11, 12

13

17

19

16

I/O

FUNCTION

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.

I, O A built-in inverter provides oscillation with

an inexpensive 3.579545 MHz crystal or

ceramic resonator.

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.

O N-channel open drain dialing pulse output

(Figure 1).

Flash key causes DP to go active when in

pulse mode and tone mode.

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).

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.

Publication Release Date: February 1995

-3-

Revision A3

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