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PT7C4337ALE Datasheet(PDF) 5 Page - Pericom Semiconductor Corporation |
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PT7C4337ALE Datasheet(HTML) 5 Page - Pericom Semiconductor Corporation |
5 / 25 page ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 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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