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HD74LS640 Datasheet(PDF) 5 Page - Renesas Technology Corp |
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HD74LS640 Datasheet(HTML) 5 Page - Renesas Technology Corp |
5 / 7 page HD74LS640 Rev.2.00, Feb.18.2005, page 5 of 6 Waveforms 2 3 V 0 V ~ ~ 4.5 V ~ ~ 1.5 V ~ ~ 1.5 V ~ ~ 0 V VOL VOH 3 V 0 V VOL VOH 1.3 V 0.5 V 0.5 V 1.3 V 1.3 V 10 % G Waveform-a Waveform-b 10 % 90 % 1.3 V 90 % tZH tZL S1 open S2 close S1, S2 close S1, S2 close S1 close S2 open tLZ tHZ tTHL tTLH Notes: 1. Input pulse: tTLH ≤ 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. |
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