DATA BULLETIN
MX623
鈥?MX鈥OM MiXed Signal CMOS
鈥?Custom Tone Decoder (13 Call-Progress
Frequencies Recognized)
鈥?Operates to a 3.579545MHz Telephone System
Clock
鈥?Operates Under Simple Logic or 碌Processor
System Control
Line-Powered Call Progress
Tone Detector
PRELIMINARY INFORMATION
鈥?Measures Call Progress Tone Frequencies
(鈥楤usy鈥? 鈥楧ial鈥? 鈥楩ax-Tone鈥?etc.)
鈥?Telephone, PABX, Fax and Dial-Up Modem
Applications
鈥?Low-Power Requirement (600碌A(chǔ) at 3.3 Volts
TYP
)
for Line-Powered Applications
V
DD
SIGNAL IN
DIGITAL
FILTER
LIMITER
AVAILABLE
PACKAGES
MEASUREMENT
AND
DECODE
V
SS
CHIP SELECT
XTAL/CLOCK
XTAL/CLOCK
OSCILLATOR
Clocks
Clocks
DATA
CHANGE
XTAL
HOLD
DATA
OUTPUTS
CONTROL
CIRCUITRY
TIMER
PURS
OUTPUT
LATCHES
Q0
Q1
Q2
Q3
MX623P
16-pin PDIP
IRQ
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: 鈥楧ial鈥?
鈥楤usy鈥? 鈥楴umber Unobtainable鈥? 鈥楻inging鈥?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
[MIN]
volt power supply, the MX623 may be line-powered and will operate under simple logic
or system
碌Processor
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.
漏 1997 MX鈥OM 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.
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