74VHC257 查看數據表（PDF） - STMicroelectronics

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74VHC257

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

STMicroelectronics 

TEST CIRCUIT

74VHC257

TEST

tPLH, tPHL

tPZL, tPLZ

tPZH, tPHZ

CL = 15/50 pF or equivalent (includes jig and probe capacitance)

RL = R1 = 1KΩ orequivalent

RT = ZOUT of pulse generator (typically 50Ω)

SW IT CH

Open

VCC

GND

WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS (f=1MHz; 50% duty cycle)

5/9

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