Call Progress Tone Detector

MX643 - Preliminary Information

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Doc. #20480148.001

4

2. Signal List

P-Pin

No.

DW-Pin

No.

Signal

Type

Description

1

2

CLOCK / XTAL

input

For the MX643P this is the external clock input to the clock

divider circuit. For the MX643DW this can be either an

external clock input or an external crystal input.

-3

XTAL

output

Output of the on-chip oscillator. Not available on 8-pin DIP..

2

4

DETECT3

output

When a single tone is within the range of the Call Progress

Band, Non Call Progress Band, or a Special Information

Tone, is detected, this output goes to a logic 1.

3

5

ENABLE

input

A logic 1 applied to this input enables the decoder and

detection outputs. A logic 0 applied to this input disables the

decoder and forces DETECT1, DETECT2 and DETECT3 to a

logic 0.

4

7

DETECT1

output

When a call progress signal is detected, this output goes to a

logic 1.

5

10

SIGIN

input

Signal input. Signals to this pin should be ac coupled. The dc

bias of this pin is set internally.

612

power

Negative supply. (ground).

7

13

DETECT2

output

This output is used in conjunction with DETECT1. When

DETECT1 is at a logic 1, this output goes to a logic 1 if a Call

Progress High Band signal is detected. When DETECT1 is

at a logic 0, this output goes to a logic 1 if a Non Call

Progress signal is detected.

815

power

capacitor.

1, 6, 8,

9, 11,

14, 16

N/C

Internal connection. Do not make a connection to these pins.