MB9B360L datasheet(55/128 Pages) CYPRESS

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Document Number: 002-04930 Rev.*B

Page 55 of 128

MB9B360L Series

Calculation Method of Power Dissipation (Pd)

The power dissipation is shown in the following formula.

Pd = VCC × ICC

+ Σ (IOL × VOL) + Σ ((VCC-VOH) × (-IOH))

IOL: "L" level output current

IOH: "H" level output current

VOL: "L" level output voltage

VOH: "H" level output voltage

ICC is a current consumed in device.

It can be analyzed as follows.

ICC = ICC

(INT) + ΣICC(IO)

ICC(INT): Current consumed in internal logic and memory, etc. through regulator

ΣICC(IO): Sum of current (I/O switching current) consumed in output pin

For ICC (INT), it can be anticipated by "12.3.1 Current Rating" in "12.3 DC Characteristics" (This rating value does not include ICC (IO)

for a value at pin fixed).

For Icc (IO), it depends on system used by customers.

The calculation formula is shown below.

ICC(IO) = (CINT + CEXT) × VCC × fsw

CINT: Pin internal load capacitance

CEXT: External load capacitance of output pin

fSW: Pin switching frequency

Parameter

Symbol

Conditions

Capacitance Value

Pin internal load capacitance

CINT

4 mA type

1.93 pF

8 mA type

3.45 pF

12 mA type

3.42 pF

Calculate ICC (Max) as follows when the power dissipation can be evaluated.

1. Measure current value ICC (Typ) at normal temperature (+25°C).

2. Add maximum leak current value ICC (leak_max) at operating on a value in (1).

ICC(Max) = ICC(Typ) + ICC(leak_max)

Parameter

Symbol

Conditions

Current Value

Maximum leak current at operating

ICC(leak_max)

Tj = +125 °C

28 mA

Tj = +105 °C

17 mA

Tj = +85 °C

13 mA

MB9B360L Datasheet(PDF) 55 Page - Cypress Semiconductor

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