HD74HC253 Datasheet, PDF (5/7 Pages) Hitachi Semiconductor – Dual 4-to-1-line Data Selectors/Multiplexers (with 3-state outputs)

HD74HC253
Waveforms
• Waveform – 1
t_r
t_f
90 %
90 %
V_CC
Input
50 %
50 %
10 %
10 %
0V
t_PLH
t_PHL
Same-phase
output
50 %
10 %
90 %
t_PHL ^tTLH
90 %
V_OH
50 %
10 %
V_OL
t_PLH
t_THL
Inverse-phase
output
90 %
50 %
10 %
t_THL
90 %
V_OH
50 %
10 %
V_OL
t_TLH
• Waveform – 2
t_f
t_r
90 %
90 %
V_CC
Input G
50 %
50 %
10 %
10 %
0V
t_ZL
t_LZ
Waveform – A
Waveform – B
50 %
t_ZH
50 %
10 %
t_HZ
90 %
V_OH
V_OL
V_OH
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 6