W91570DN datasheet(3/45 Pages) WINBOND

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W91570DN SERIES

Publication Release Date: May 1997

- 3 -

Revision A2

PIN DESCRIPTION

SYMBOL

PIN NO.

I/O

FUNCTION

Row,

Column

Inputs

−33

and

−28

The keyboard inputs may be used with either the standard 6

×10

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, XT

34, 35

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

chip enable 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,

auto redial break and flash break. Otherwise, it is switched off.

H/P MUTE

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

pulse dialing, one-key redial break, auto redial break, flash

break, hold, and mercury functions, this pin will output an active

high. It remains in a low state at all other times.

KMUTE

The KMUTE is a CMOS N-channel open drain output. The

output transistor is switched on only during mute function.

Otherwise, it is switched off.

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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