HD74LS645FPEL 查看數據表（PDF） - Renesas Electronics

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HD74LS645FPEL

Octal Bus Transceivers (non-inverted 3-state outputs)

Renesas Electronics 

HD74LS645

Waveforms 2

Notes:

G

tTHL

90 %

tTLH

3V

3V

90 %

1.3 V

1.3 V

10 %

10 %

0V

0V

Waveform-a

tZL

S1 close

S2 open

~~ 4.5 V

1.3 V

VOL

tLZ

S1, S2 close ~~ 1.5 V

0.5 V VOL

Waveform-b

tZH

S1 open

S2 close

VOH

1.3 V

~~ 0 V

tHZ

VOH

0.5 V

S1, S2 close ~~ 1.5 V

1. Input pulse: tTLH ≤ 15 ns, tTHL ≤ 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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