HD74HCT240

Rev.2.00 Mar 30, 2006 page 4 of 6

Test Circuit

OPEN

GND

50 pF

1

G, 2G

Ω

Input

1 k

Ω

S1

Output

TEST

S1

OPEN

GND

1A1 to 2A4

1Y1 to 2Y4

Pulse Generator

Waveforms

0 V

10 %

90 %

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

10 %

90 %

Input A

Output Y

0 V

10 %

10 %

90 %

90 %

1.3 V

1.3 V

Input G

Waveform – A

Waveform – B

90 %

10 %

10 %

90 %

10 %

90 %

Notes : 1. Input waveform : PRR

2. Waveform– A is for an output with internal conditions such that the

output is low except when disabled by the output control.

3. Waveform– B is for an output with internal conditions such that the

output is high except when disabled by the output control.

4. The output are measured one at a time with one transition per measurement.