PT7C4337ALE datasheet(5/25 Pages) PERICOM

Part #	PT7C4337ALE

Description	Real-time Clock Module

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Manufacturer	PERICOM [Pericom Semiconductor Corporation]

Direct Link	http://www.pericom.com

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2014-10-0002

PT0480-2

11/03/14

5

PT7C4337A/4337AC

Real-time Clock Module (I

2C Bus)

Recommended Layout for Crystal (Only for PT7C4337A)

Built-in Capacitors Specifications and Recommended External Capacitors

Parameter

Symbol

Typ

Unit

Build-in capacitors

X1 to GND

CG

12

pF

X2 to GND

CD

12

pF

Recommended External capacitors for

crystal CL=12.5pF

X1 to GND

C1

12

pF

X2 to GND

C2

12

pF

Recommended External capacitors for

crystal CL=6pF

X1 to GND

C1

0

pF

X2 to GND

C2

0

pF

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

fO

-

32.768

-

kHz

Series Resistance

ESR

-

70

k

Load Capacitance

CL

-

6/12.5

-

pF

Note: The crystal, traces and crystal input pins

should be isolated from RF generating signals.

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PT7C4337ALE Datasheet(PDF) 5 Page - Pericom Semiconductor Corporation

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