HD74LS645

Rev.2.00, Feb.18.2005, page 5 of 6

Waveforms 2

3 V

3 V

0 V

~

~ 1.5 V

~

~ 1.5 V

~

~ 0 V

1.3 V

1.3 V

1.3 V

10 %

10 %

G

Waveform-a

Waveform-b

90 %

90 %

0.5 V

0.5 V

0 V

~

~ 4.5 V

1.3 V

Notes:

1.

≤ 15 ns, t

THL

≤ 6 ns, PRR = 1 MHz, duty cycle 50%

2.

Waveform a is an output by internal conditions like "L" except for the case where an output is

disabled by output control.

3.

Waveform b is an output by internal conditions like "H" except for the case where an output is

disabled by output control.