HD74HC279 Datasheet, PDF (4/6 Pages) Hitachi Semiconductor – Quad. S-R Latches

HD74HC279
Test Circuit
Measurement point
C_L*
Waveforms
Note: C_L includes the probe and fig capacitance.
• Waveform
tr
tf
90% 90%
S
50%
10%
50%
10%
tr
90%
R
10%
tf
90%
50%
10%
tPHL
tPLH
tPHL
90%
90%
Q
50%
50%
50%
10% 10%
tTHL
tTLH
Note : 1. Input pulse : PRR ≤ 1 MHz, Zo = 50 Ω, t_r ≤ 6 ns, t_f ≤ 6 ns
V_CC
0V
V_CC
0V
VOH
VOL
Rev.2.00 Jan 31, 2006 page 4 of 5