PT7C43390LEX datasheet(7/38 Pages) PERICOM

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2015-12-0001

PT0280-8

12/11/15

PT7C43390/43390C

Real-time Clock Module

Recommended Layout for Crystal (for PT7C43390)

Built-in Capacitors Specifications and Recommended External Capacitors

Parameter

Symbol

Typ.

Unit

Build in capacitors

XIN to GND

XOUT to GND

Recommended External capacitors for crystal

CL=12.5pF

XIN to GND

XOUT to GND

Recommended External capacitors for crystal

CL=6pF

XIN to GND

XOUT to GND

Note: The frequency of crystal can be optimized by external capacitor C1 and C2, for frequency=32.768 kHz, C1 and C2 should

meet the equation as below: Cpar + [(C1+CG)*(C2+CD)]/ [(C1+CG) + (C2+CD)] =CL

Cpar is all parasitical capacitor between X1 and X2.

CL is crystal’s load capacitance.

Crystal Specifications

Parameter

Symbol

Min.

Typ.

Max.

Unit

Nominal frequency

32.768

kHz

Serial resistance

ESR

kΩ

Load capacitance

6/12.5

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