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HD74HC640 Datasheet, PDF (7/11 Pages) Hitachi Semiconductor – Octal Bus Transceivers (with 3-state outputs) | |||
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HD74HC640, HD74HC643
Waveforms
HD74HC640
⢠Waveform â 1
tr
tf
90 %
90 %
VCC
Input A
50 %
50 %
10 %
10 %
0V
tPHL
tPLH
Output B
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
VOH
Waveform - A
50 %
10 %
tZH
tHZ
VOL
Waveform - B
50 %
90 %
VOH
VOL
Notes : 1. Input waveform : PRR ⤠1 MHz, duty cycle 50%, tr ⤠6 ns, tf ⤠6 ns
2. Waveform - A is for an output with internal conditions such that the
output is low except when disabled by the output control.
3. Waveform - 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 Mar 30, 2006 page 7 of 10
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