Z8F64220100ZDA Zilog, Z8F64220100ZDA Datasheet - Page 223
Manufacturer Part Number
ADAPTER ICE Z8 ENCORE 64K 64LQFP
Specifications of Z8F64220100ZDA
For Use With/related Products
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Oscillator Operation with an External RC Network
Figure 40. Connecting the On-Chip Oscillator to an External RC Network
The External RC oscillator mode is applicable to timing insensitive applications.
capacitor (RC) network.
An external resistance value of 45 kΩ is recommended for oscillator operation with an
external RC network. The minimum resistance value to ensure operation is 40 kΩ. The
typical oscillator frequency can be estimated from the values of the resistor (R in kΩ) and
capacitor (C in pF) elements using the following equation:
capacitor (C in pF) employed in the RC network assuming a 45 kΩ external resistor. For
very small values of C, the parasitic capacitance of the oscillator XIN pin and the printed
circuit board should be included in the estimation of the oscillator frequency.
It is possible to operate the RC oscillator using only the parasitic capacitance of the pack-
age and printed circuit board. To minimize sensitivity to external parasitics, external
capacitance values in excess of 20 pF are recommended.
Oscillator Frequency (kHz)
displays a recommended configuration for connection with an external resistor-
displays the typical (3.3 V and 25 °C) oscillator frequency as a function of the
Z8 Encore! XP