Z8F021ASH020SC datasheet(205/276 Pages) ZILOG

205 / 276 page

PS022815-0206

Crystal Oscillator

Z8 Encore! XP® 4K Series

Product Specification

186

The stabilization time will vary depending on the crystal or resonator used, as well as on

the feedback network. See Table 114 for transconductance values to compute oscillator

stabilization times.

Figure 27 illustrates a recommended configuration for connection with an external funda-

mental-mode, parallel-resonant crystal operating at 20 MHz. Recommended 20 MHz crys-

tal specifications are provided in Table 113. Resistor R1 is optional and limits total power

dissipation by the crystal. Printed circuit board layout must add no more than 4 pF of stray

capacitance to either the XIN or XOUT pins. If oscillation does not occur, reduce the values

of capacitors C1 and C2 to decrease loading.

Figure 27.Recommended 20 MHz Crystal Oscillator Configuration

Table 113. Recommended Crystal Oscillator Specifications

Parameter

Value

Units

Comments

Frequency

MHz

Resonance

Parallel

Mode

Fundamental

Series Resistance (RS)

Maximum

Note:

C2 = 15pF

C1 = 15pF

Crystal

XOUT

XIN

On-Chip Oscillator

Z8F021ASH020SC 数据表(PDF) 205 Page - Zilog, Inc.

Z8F021ASH020SC 数据表(HTML) 205 Page - Zilog, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载