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CMX644A Datasheet(PDF) 6 Page - CML Microcircuits |
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CMX644A Datasheet(HTML) 6 Page - CML Microcircuits |
6 / 34 page V22 and Bell 212A Modem CMX644A © 2000 Consumer Microcircuits Limited 6 D/644A/6 1.4 External Components R1 100k Ω * C1, C2 18pF X1 3.6864MHz, 7.372800MHz or 11.0592MHz C3, C4 C5 0.1 µF 1 µF Resistors ±1%, capacitors ±20% unless otherwise stated. * R1 should be selected so that the IRQN pin has returned to its normal (high) state before the CSN pin goes high. Figure 2 Recommended External Components for Typical Application Notes on Xtal Osc and Clock Dividers Frequency and timing accuracy of the CMX644A is determined by the clock present at the XTAL/CLOCK 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/CLOCK input. If the clock is supplied from an external source, C1, C2 and X1 should not be fitted. The on-chip oscillator is turned off in the 'Zero-Power' mode. If the clock is provided by an external source which is not always running, then the 'Zero-Power' mode must be set when the clock is not available. Failure to observe this rule may cause a rise in the supply current drawn by CMX644A. |
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Similar Description - CMX644A |
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