SN54HCT273, SN74HCT273

OCTAL DTYPE FLIPFLOPS

WITH CLEAR

SCLS068E − NOVEMBER 1988 − REVISED AUGUST 2003

5

POST OFFICE BOX 655303

PARAMETER

TEST CONDITIONS

TYP

UNIT

Cpd

Power dissipation capacitance

No load

30

pF

PARAMETER MEASUREMENT INFORMATION

VOLTAGE WAVEFORMS

SETUP AND HOLD AND INPUT RISE AND FALL TIMES

VOLTAGE WAVEFORMS

PULSE DURATIONS

th

tsu

1.3 V

1.3 V

1.3 V

0.3 V

0.3 V

2.7 V

2.7 V

3 V

3 V

0 V

0 V

tr

tf

Reference

Input

Data

Input

1.3 V

High-Level

Pulse

1.3 V

3 V

0 V

1.3 V

1.3 V

3 V

0 V

tw

Low-Level

Pulse

VOLTAGE WAVEFORMS

PROPAGATION DELAY AND OUTPUT RISE AND FALL TIMES

1.3 V

1.3 V

1.3 V

10%

10%

90%

90%

3 V

VOH

VOL

0 V

tr

tf

Input

In-Phase

Output

1.3 V

tPLH

tPHL

1.3 V

1.3 V

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

NOTES: A. CL includes probe and test-fixture capacitance.

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

characteristics: PRR

≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.

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

D. For clock inputs, fmax is measured when the input duty cycle is 50%.

E. tPLH and tPHL are the same as tpd.

Figure 1. Load Circuit and Voltage Waveforms