M74HCT257B1R(1993) Просмотр технического описания (PDF) - STMicroelectronics

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M74HCT257B1R
(Rev.:1993)

HCT257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) HCT258 QUAD 2 CHANNEL MULTIPLEXER (3-STATE, INVERTING)

STMicroelectronics 

SWITCHING CHARACTERISTICS TEST WAVEFORM

M54/M74HCT257/258

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 × VCC

INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF

SWITCHING CHARACTERSISTICS TESt.

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