W91590CL datasheet(3/20 Pages) WINBOND

Part #	W91590CL

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

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Manufacturer	WINBOND [Winbond]

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W91590 SERIES

Publication Release Date: July 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 from either the

standard 9

× 5 keyboard or an inexpensive

single contact (form A) keyboard. Electronic

input from a

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.

HPM

MUTE

-

23

O The HPM MUTE is a conventional inverter

output. During pulse dialing, flash, hold, and

mercury mute functions, this pin will output

an active high. It remains in a low state at all

other times.

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 (M/B = 2:3).

Leaving mode pin floating places the dialer

in pulse mode (M/B = 1:2).

HKS

12

14

16

I

Hook switch input.

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

mode, no operation.

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

normal operation.

HKS pin is pulled to VDD by internal resistor.

DP /C9

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.

NC

17

(W91590)

19

(W91590A)

22

(W91590B/C)

-

No connection.

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