HT9020 datasheet(1/12 Pages) HOLTEK

Part #	HT9020

Description	Call Progress Tone Decoder & ABR Controller

PDF	12 Pages

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Manufacturer	HOLTEK [Holtek Semiconductor Inc]

Direct Link	http://www.holtek.com

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HT9020

Call Progress Tone Decoder & ABR Controller

Selection Table

Features

•

Low cost 32768Hz crystal

•

Low power consumption

•

Operating voltage: 2.5V to 5.5V (CPT mode)

2.0V to 5.5V (ABR mode)

•

Call progress tone decoder

–

Fully decoded tristate call progress status

output

–

Works with traditional precision or PBX call

progress tones

•

Busy redial controller

–

Repeat times: 3, 10 or 15 times

( 2, 5, 15 times by mask option)

–

4.65, 32.6 and 62.8 sec break time

(16.3sec by mask option)

–

Auto-terminate after 30 times (default)

ringback tone receipt

General Description

The HT9020 provides two modes; Call progress

tone decoder and Busy redial controller, to sup-

port the application fields.

Standard call progress tone decoder

This feature detects a specified input signal and

then outputs relative envelopes during a 2.32sec

interval. Three tristate output pins (DIAL, RBK,

BUSY) indicate the presence of a dial tone, ring-

back tone or busy/reorder tone respectively, so it

provides information that enables the microproc-

essor to decide whether to initiate, continue or

terminate calls.

Busy redial controller

This feature implements a busy redial function.

After decoding, if the line is busy, this device

forces the dialer to break for 62.8 sec, then

triggers the redial key after the dial tone re-

ceipt. If the receiver is still busy, the redial

sequence will be repeated 10 times. If the re-

ceiver is ringing, the redial sequence will be

terminated after 30 times of ringback tone re-

ceipt.

Function

Part No.

HT9020A

HT9020B

Operating

Voltage

OSC

Frequency

CPT Decoder

ABR

Repeat Times

ABR

Break Time

Package

CPT mode

2.5V~5.5V

ABR mode

2.0V~5.5V

32768Hz

18 DIP/SOP

8 DIP

CPT mode

2.5V~5.5V

32768Hz

Full decoded

CPT envelope only

3/10/15 times

[2/5/15 by

metal option]

4.65/32.6/62.8 sec

[16.3 sec by

metal option]

1

21st Aug ’98

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