DATA BULLETIN

MX623

PRELIMINARY INFORMATION

The MX623 is a low-power decoding integrated circuit that measures the frequency of telephone system call progress

tones.

With progress signals input from the telephone line, this single-chip product is programmed to recognize up to thirteen

of the World's most commonly used call-progress frequencies, analyze signal quality, and present the measured result

as a 4-bit parallel data word at the tri-state Data Output.

Using the parallel information from the MX623, the host system, can recognize such call progress information as: ‘Dial’,

‘Busy’, ‘Number Unobtainable’, ‘Ringing’ and Fax/Modem system signals.

This information can then be used in simple or complex applications to control telephone operations. The data output

will require a software format that can analyze the frequency information from the MX623.

Requiring only a single 3.0

or system

µProcessor control using the 'Data-Change, 'Hold' and 'Chip-Select' functions.

The MX623, whose small size and low power consumption makes it ideal for remote applications, requires a

3.579545MHz telephone system clock or Xtal input, is available in a 16-pin PDIP.

AVAILABLE

PACKAGES

MX623P

16-pin PDIP

XTAL/CLOCK

OSCILLATOR

SIGNAL IN

XTAL/CLOCK

Clocks

Clocks

DATA

CHANGE

DATA

OUTPUTS

Q0

Q1

Q2

Q3

IRQ

CONTROL

CIRCUITRY

TIMER

CHIP SELECT

HOLD

PURS

DIGITAL

FILTER

OUTPUT

LATCHES

LIMITER

XTAL

MEASUREMENT

AND

DECODE

•

MX•COM MiXed Signal CMOS

•

Custom Tone Decoder (13 Call-Progress

Frequencies Recognized)

•

Operates to a 3.579545MHz Telephone System

Clock

•

Operates Under Simple Logic or µProcessor

System Control

•

Measures Call Progress Tone Frequencies

(‘Busy’, ‘Dial’, ‘Fax-Tone’ etc.)

•

Telephone, PABX, Fax and Dial-Up Modem

Applications

•

Low-Power Requirement (600µA at 3.3 Volts

for Line-Powered Applications

Line-Powered Call Progress

Tone Detector

© 1997 MX

•COM Inc.

www.mxcom.com Tele: 800 638-5577 910 744-5050

Fax: 910 744-5054

Doc. # 20480091.003

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.