HD74LV244A Datasheet, PDF (7/10 Pages) Hitachi Semiconductor – Octal Buffers / Drivers with 3-state Outputs

HD74LV244A
• Waveform − 1
t_r
t_f
90%
90%
V_CC
Input A
50% V_CC
50% V_CC
10%
10 %
0V
t_PLH
t_PHL
Output Y
V_OH
50% V_CC
50% V_CC
V_OL
• Waveform − 2
t_f
t_r
90%
90%
V_CC
Input OE
50% V_CC
50% V_CC
10%
10 %
0V
t_ZL
t_LZ
Waveform − A
Waveform − B
50% V_CC
t_ZH
50% V_CC
V_OL + 0.3 V
t_HZ
V_OH − 0.3 V
V_CC
V_OL
V_OH
0V
Notes: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, t_r ≤ 3 ns, t_f ≤ 3 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.3.00 Jun. 24, 2004 page 7 of 9