MFC2000 datasheet(348/426 Pages) ETC

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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

18-4

Conexant

100723A

18.3.4 Crystal Oscillator

Specifications for the clock crystal, a crystal oscillator schematic and circuit board layout recommendations follow.

18.3.5 RTC Crystal Specifications

Table 18-1. RTC Crystal Specifications for 32.768 kHz

Characteristic

Value for 32.768 kHz

Nominal Frequency @25°C (F)

32.768 kHz ± 20 ppm

Turnover Temperature (To)

25°C ± 5°C

Temperature Characteristic (K)*

-0.038 ppm/°C2 Typ

Temperature Stability

-160 ppm, Typ @ -40°C

-137 ppm, Typ @ +85°C

Quality Factor

100,000 Typ

Load Capacitance

12.5 pF ±2%

Series Resistance

30 K

Ω Max

Motional Capacitance

3.5 pF Typ

Shunt Capacitance

1.7 pF Typ

Maximum Drive Level

1.0 µW

Aging (

∆ F/f)

5.0 ppm, First Year

Operating Temperature

-10°C to +60°C

∆ F/f) = K(To-T)2 where T= point of temperature comparison

Recommended RTC Crystal Interface Circuit

Typical Values

32.768 kHz

10 M

Ω

0 K

Ω

22 pf

AM F PC

XIN

XO UT

Note: Adjustment to the values of C1 and C2 may be required to obtain the correct operating

frequency due to stray capacitance on the Developer’s circuit board.

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