AS2533 datasheet(3/25 Pages) AMSCO

3 / 25 page

Rev. 7

July 1998

Data Sheet

AS2533...6

Pin Description cont´d

Pin #

Symbol

Function

MODE

Signalling Mode Select Input

Mode pin

Function

Open

Dialling inhibited

Row 1

LD mode, 10 pps, 33/66 ms

Row 2

LD mode, 10 pps, 40/60 ms

Row 3

LD mode, 20 pps, 33/66 ms

Row 4

LD mode, 20 pps, 40/60 ms

Row 5

LD mode, 10 pps, 33/66 ms, Temp. MF with tone on first * key entry

Row 6

MF only, 82/82 ms

Row 7

MF only, 82/160 ms

During temporary MF: 82/160 ms

Keyboard Rows

(see key arrangement in figure 2)

Keyboard Columns

(see key arrangement in figure 2)

7CI

Complex Impedance Pin

For complex impedance a capacitor should be connected to this pin.

MFL

MF Level Setting

A voltage divider connected from this pin to A

GND and VSS can be used to set the DTMF

level.

Selection Overview

Function

AS2533

AS2534B

AS2534E

AS2535

AS2536

Direct memories (one-key)

Indirect memories (two-key)

Repeat dialling

yes

LNR key

yes

Pause insertion by LNR key

yes

Pause (PS) key

yes

P/M or MT key

P/M

Tone/Pulse (T/P) key

yes

Temperary MF by * key

yes

Centrex (A - D) keys

yes

Volume (VOL, –/+) keys

yes

Volume reset by off-hook

yes

Programming of tone ringer

yes

R3 Flash duration

600 ms

375 ms

600 ms

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