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HD74HC251 Datasheet, PDF (6/9 Pages) Hitachi Semiconductor – 1 of 8 Data Selectors/Multiplexers (with 3-state outputs) | |||
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HD74HC251
Waveforms
⢠Waveform â 1
tr
tf
90 %
90 %
VCC
Input
50 %
50 %
10 %
10 %
0V
tPLH
tPHL
Same-phase
output
50 %
10 %
90 %
tPHL tTLH
90 %
VOH
50 %
10 %
VOL
tPLH
tTHL
Inverse-phase
output
90 %
50 %
10 %
tTHL
90 %
VOH
50 %
10 %
VOL
tTLH
⢠Waveform â 2
tf
tr
90 %
90 %
VCC
Input G
50 %
50 %
10 %
10 %
0V
tZL
tLZ
Waveform â A
Waveform â B
50 %
tZH
50 %
10 %
tHZ
90 %
VOH
VOL
VOH
VOL
Notes : 1. Input waveform : PRR ⤠1 MHz, duty cycle 50%, tr ⤠6 ns, tf ⤠6 ns
2. Waveformâ A is for an output with internal conditions such that the
output is low except when disabled by the output control.
3. Waveformâ 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.
Rev.2.00 Jan 31, 2006 page 6 of 8
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