M74HCT643 Просмотр технического описания (PDF) - STMicroelectronics

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M74HCT643

HCT640 INVERTING, HCT643 INVERTING/NON INVERTING OCTAL BUS TRANSCEIVER (3-STATE): HCT245 NON INVERTING

STMicroelectronics 

M54/M74HCT245/640/643

TEST CIRCUIT ICC (Opr.)

CPD CALCULATION

CPD is to be calculated with the following

formula by using the measured value of ICC

(Opr.) in the test circuit opposite.

CPD

=

ICC

f IN

(Opr.)

x VCC

In determining the value of CPD, a relatively

high frequency of 1 MHz was applied to fIN, in

orther to eliminate any error caused by the

quiescent supply current.

6/11

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