M54HC620 查看數據表（PDF） - STMicroelectronics

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M54HC620

HC620 3 STATE INVERTING HC623 3 STATE NON INVERTING OCTAL BUS TRANSCEIVER

STMicroelectronics 

M54/M74HC620/623

SWITCHING CHARACTERISTICS TEST WAVEFORM

VCC

GND

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 (Opr.)

fIN x VCC

In determining the typical value of CPD, a rela-

tively high frequency of 1 MHz was applied to fIN,

in order to eliminate any error caused by the

quiescent supply current.

INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF

SWITCHING CHARACTERISTICSTEST.

6/11

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