W91560DN datasheet(3/33 Pages) WINBOND

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Preliminary W91560DN SERIES

Publication Release Date: May 1997

- 3 -

Revision A2

PIN DESCRIPTION

SYM.

PIN NO.

I/O

FUNCTION

Row,

Column

Inputs

−21,

−17

The keyboard inputs may be used with either the standard 5

× 6

keyboard, an inexpensive single contact (form A) keyboard or

electronic input.

A valid key entry is defined by a single row being connected to a

single column.

XT1,

XT1

22, 23

I, O

A built-in inverter provides oscillation with an inexpensive

3.579545 MHz crystal or ceramic resonater.

The oscillator ceases when a keypad input is not sensed after the

chip is enabled and dialing is finished. The crystal frequency

deviation is

±0.02%.

T/P

MUTE

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

output.

The output transistor is switched on low level during the dialing

sequence (both pulse and tone mode), one-key redial break and

flash break. Otherwise, it is switched off.

H/P

MUTE

(W91560DNF,

W91562DNF,

W91564DNF,

W91565DNF

only)

The H/P MUTE is a conventional CMOS inverter output, During

pulse dialing, one-key redial break, flash break and hold functions,

this pin will output an active high.

It remains in a low state at all other times.

LOCK

(W91561DLNF,

W91563DLNF

only)

The LOCK pin is used to prevent "0" or "9" dialing under PABX

system long distance call control. When the first key input after

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

become invalid, and the chip generates no output.

The telephone is reinitialized by a reset.

The following table describes the functions of the LOCK pin:

LOCK PIN

Floating

VDD

FUNCTION

Normal dialing

"0", "9" dialing inhibited

"0" dialing inhibited

HKS

Hook switch input.

HKS

= VDD or floating: On-hook state. Chip in sleeping mode,

no operation.

HKS

= VSS: Off-hook state. Chip enable for normal operation.

HKS

pin is pulled to VDD by internal resistor.

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