SN74HC21-Q1

DUAL 4-INPUT POSITIVE-AND GATE

SCLS597A − NOVEMBER 2004 − REVISED APRIL 2008

4

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

VOLTAGE WAVEFORM

INPUT RISE AND FALL TIMES

50%

50%

10%

10%

90%

90%

0 V

Input

VOLTAGE WAVEFORMS

PROPAGATION DELAY AND OUTPUT TRANSITION TIMES

50%

50%

50%

10%

10%

90%

90%

0 V

Input

In-Phase

Output

50%

50%

50%

10%

10%

90%

90%

Out-of-Phase

Output

Test

Point

From Output

Under Test

(see Note A)

LOAD CIRCUIT

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

characteristics: PRR

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

Figure 1. Load Circuit and Voltage Waveforms