M74HCT648TTR 查看數據表（PDF） - STMicroelectronics

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M74HCT648TTR

OCTAL BUS TRANSCEIVER/REGISTER WITH 3 STATE OUTPUTS (INVERTING)

STMicroelectronics 

TEST CIRCUIT

M74HC648

TEST

tPLH, tPHL

tPZL, tPLZ

tPZH, tPHZ

CL = 50pF/150pF or equivalent (includes jig and probe capacitance)

R1 = 1KΩ or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

WAVEFORM 1 : PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle)

SWITCH

Open

VCC

GND

7/15

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