CMX602B Consumer Microcircuits Limited, CMX602B Datasheet - Page 13

• Manufacturer Part Number: CMX602B
• Description: Calling Line Identifier Plus Call Waiting Type ii
• Manufacturer: Consumer Microcircuits Limited

Calling Line Identifier
1.5.9
Frequency and timing accuracy of the CMX602B is determined by a 3.579545MHz clock present at the
XTAL pin. 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 CMX602B as well as generating undefined states of the RXD, DET and IRQN outputs.
 2003 CML Microsystems Plc
Xtal Osc and Clock Dividers
13
CMX602B
D/602B/2