HD74LS640 Datasheet, PDF(5/7 Page) Hitachi Semiconductor – Octal Bus Transceivers(inverted 3-state outputs)

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HD74LS640 Datasheet, PDF (5/7 Pages) Hitachi Semiconductor – Octal Bus Transceivers(inverted 3-state outputs)

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HD74LS640

Waveforms 2

Notes:

tTHL

tTLH

90 %

1.3 V

10 %

10 % 1.3 V

Waveform-a

Waveform-b

tZL

S1 close

S2 open

tZH

S1 open

S2 close

~~ 4.5 V

1.3 V

VOL

1.3 V

VOH

~~ 0 V

tLZ

S1, S2 close ~~ 1.5 V

0.5 V

tHZ

VOL

VOH

0.5 V ~~ 1.5 V

S1, S2 close

1. Input pulse: tTLH â¤ 15 ns, tTHL â¤ 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.

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

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