Z8F021ASH020SC datasheet(206/276 Pages) ZILOG

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PS022815-0206

Crystal Oscillator

Z8 Encore! XP® 4K Series

Product Specification

187

Note: * Printed circuit board layout should not add more than 4 pF of stray capacitance to either XIN or XOUT pins. if

no Oscillation occurs, reduce the values of the capacitors C1 and C2 to decrease the loading.

Oscillator Operation with an External RC Network

Figure 28 illustrates a recommended configuration for connection with an external resis-

tor-capacitor (RC) network.

Load Capacitance (CL)30

Maximum

Shunt Capacitance (C0)

Maximum

Drive Level

Maximum

Table 114. Transconductance Values for Low, Medium, and High Gain Operating Modes

Mode

Crystal Frequence Range

Function

Transconductance (mA/V)

Use this range for

calculations

Low Gain

(see Note)

32 KHz - 1 MHz

Low Power/Frequency

Applications

0.02

0.04

0.09

Medium Gain

(see Note)

0.5 MHz - 10 MHz

Medium Power/Frequency

Applications

0.84

1.7

3.1

High Gain

(see Note)

8 MHz - 20 MHz

High Power/Frequency

Applications

1.1

2.3

4.2

Table 113. Recommended Crystal Oscillator Specifications

Parameter

Value

Units

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