W91810AN datasheet(4/26 Pages) WINBOND

Part #	W91810AN

Description	23-MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

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Manufacturer	WINBOND [Winbond]

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W91810N SERIES

- 4 -

Pin Description, continued

SYMBOL

22-PIN

24-PIN

28-PIN

I/O

FUNCTION

KT

(W91810N/81

0AN/812N/812

AN/811AN/813

AN only)

6

7

O

The key tone output is a conventional CMOS

inverter. 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.

LOCK

(W91810LN/

810ALN/

811ALN only)

6

7

I

The function of this terminal is to prevent "0"

dialing and "9" dialing under PABX system long

distance call control. When the first key input after

reset is 0 or 9, all key inputs, including the 0 or 9

key, become invalid and the chip generates no

output. The telephone is reinitialized by a reset.

The function of the LOCK pin is shown below:

LOCK PIN

FUNCTION

VDD

VSS

Floating

"0", "9" dialing inhibited

Normal dialing Mode

"0" dialing inhibited

H/P MUTE

7

8

I

The H/P MUTE is a conventional inverter output.

During pulse dialing, flash break or hold period,

this output is active high; otherwise, it remains in

low state.

DP

13

15

18

O

N-channel open drain dialing pulse output.

Flash key will cause DP to be active in either tone

mode or pulse mode.

In lock mode, the DP remains low for 300 mS

during off-hook delay time.

The timing diagram for pulse mode is shown in

Figure 1(a, b).

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