HD74HC244_15 Datasheet, PDF (7/10 Pages) Renesas Technology Corp – Octal Buffers/Line Drivers/Line Receivers (with inverted 3-state outputs)

HD74HC244
Waveforms
• Waveform – 1
t_r
t_f
90 %
90 %
V_CC
Input A
50 %
50 %
10 %
10 %
0V
t_PLH
t_PHL
Output Y
50 %
10 %
90 %
t_TLH
90 %
V_OH
50 %
10 %
V_OL
t_THL
• Waveform – 2
t_f
t_r
90 %
90 %
V_CC
Input G
50 %
50 %
10 %
10 %
0V
t_ZL
t_LZ
V_OH
Waveform – A
50 %
10 %
t_ZH
t_HZ
V_OL
Waveform – B
90 %
V_OH
50 %
V_OL
Notes : 1. Input waveform : PRR ≤ 1 MHz, duty cycle 50%, t_r ≤ 6 ns, t_f ≤ 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 Jan 31, 2006 page 5 of 7