CMX602A View Datasheet(PDF) - MX-COM Inc
Part Name
Description
Manufacturer
CMX602A Datasheet PDF : 21 Pages
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Calling Line Identifier/Calling Line Identifier on Call Waiting 12
CMX602A PRELIMINARY INFORMATION
4.10 Xtal Osc and Clock Dividers
A 3.579545MHz clock present at the XTAL pin determines frequency and timing accuracy of the CMX602A.
This may be generated by the on-chip oscillator inverter using the external components C1, C2, and X1 of
Figure 2, or may be supplied from an external source to the XTAL input, in which case C1, C2, and X1 should
not be fitted.
The oscillator is turned off in the 'Zero-Power' modes.
If the clock is provided by an external source which is not always running, then the ZP input must be set high
when the clock is not available. Failure to observe this rule may cause a significant rise in the supply current
drawn by CMX602A as well as generating undefined states of the RXD, DET, and IRQ outputs.
5. Application
5.1 'On-Hook' Operation
The systems described in this section operate when the telephone set is not in use (on-hook) to display the
number of a calling party before the call is answered. System specific descriptions are provided as well as a
flowchart for on-hook applications (Figure 13).
5.1.1 Bellcore System
Figure 11 illustrates the line signaling and CMX602A input and output signals for the Bellcore 'On-Hook'
Caller ID system as defined in Bellcore documents GR-30-CORE and SR-TSV-002476 and also in ETS 300
659-1 Section 6.1.1.
As for the British Telecom system, the 'Chan Seize' signal is a '1010…' FSK bit sequence. The Bellcore
specifications do not require AC or DC line terminations while the FSK data is being received, however ETS
300 659-1 allows for the possibility of an AC termination begin applied.
Note: For simplicity of presentation, the Data Retiming function is not used in Figure 11 (RXCLK is kept high).
SIGNALING
FIRST
RING
≥ 250mS
250mS
CHAN
SEIZE
3400 to 4400 mS
150mS
MARK
MESSAGE
≥ 200mS
RINGING
RD
RT
IRQ
ZP
MODE
DET
RXD
Figure 11: Bellcore System Signals
¤1999 MX-COM, Inc
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480169.004
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