A.

CL includes probe and test-fixture capacitance.

B.

Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2

is for an output with internal conditions such that the output is high except when disabled by the output control.

C.

All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 3 ns, tf = 3 ns. Phase

relationships between waveforms are arbitrary.

D.

For clock inputs, fmax is measured with the input duty cycle at 50%.

E.

The outputs are measured one at a time with one input transition per measurement.

F.

tPLH and tPHL are the same as tpd.

G.

tPZL and tPZH are the same as ten.

H.

tPLZ and tPHZ are the same as tdis.

TEST

S1

tPLH/tPHL

Open

tPLZ/tPZL

2 × VCC

tPHZ/tPZH

GND

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CD54AC74, CD74AC74

SCHS231E – NOVEMBER 1998 – REVISED AUGUST 2024

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