Power Supply Integrity

   

Capacitor size

= (<25 to 100> × equivalent switched logic array capacitance) / number of VCCINT pins

 

= (<25 to 100> / number of VCCINT pins) × logic array power / (VCCINT2 × clock-frequency)

   

Capacitor size

= (50 / 36 ) x 5W / (1.2V2 x 150MHz)

 

= 3.215E-08

 

= 0.03215E-06

   

equivalent switched I/O capacitance (per VCCIO)

= number of loads × average load per output signal

high-frequency I/O capacitance

=<25 to 100> × equivalent switched I/O capacitance

individual capacitor size

= high-frequency I/O capacitance / number of VCCIO pins in the bank

 

= (<25 to 100> / number of VCCIO pins) × number of loads × average load per output signal

   

Capacitor size

= (50 / 5) * 40 * 10pF

 

= 4.0E-09

 

= 0.004E-06