VOLTAGE WAVEFORMS

SETUP AND HOLD AND INPUT RISE AND FALL TIMES

VOLTAGE WAVEFORMS

PULSE DURATIONS

th

tsu

50%

50%

50%

10%

10%

90%

90%

VCC

VCC

0 V

0 V

tr

tf

Reference

Input

Data

Input

50%

High-Level

Pulse

50%

VCC

0 V

50%

50%

VCC

0 V

tw

Low-Level

Pulse

VOLTAGE WAVEFORMS

PROPAGATION DELAY AND OUTPUT TRANSITION TIMES

50%

50%

50%

10%

10%

90%

90%

VCC

VOH

VOL

0 V

tr

tf

Input

In-Phase

Output

50%

tPLH

tPHL

50%

50%

10%

10%

90%

90%

VOH

VOL

tr

tf

tPHL

tPLH

Out-of-Phase

Output

Test

Point

From Output

Under Test

CL = 50 pF

(see Note A)

LOAD CIRCUIT

SN54HC74, SN74HC74

www.ti.com

SCLS094E – DECEMBER 1982 – REVISED DECEMBER 2015

7 Parameter Measurement Information

A.

B.

Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having

the following characteristics: PRR

C.

D.

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

E.

Figure 2. Load Circuit and Voltage Waveforms

Copyright © 1982–2015, Texas Instruments Incorporated

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