HD74HC679 Datasheet, PDF (5/7 Pages) Hitachi Semiconductor – 12-bit Address Comparator

HD74HC679
Test Circuit
VCC
Input
Pulse Generator
Zout = 50 Ω
VCC
G
A₁
Output
A₁₂
Y
P₀
P₃
C_L =
50 pF
Note : 1. C_L includes probe and jig capacitance.
Waveforms
• Waveform – 1
P or A
Y
• Waveform – 2
G
Y
tr
90%
50%
10%
tPLH
90%
50%
tTLH
50%
tPLH
50%
10%
90%
tTLH
tf
90%
50%
10%
tPHL
90%
50%
10%
tTHL
50%
tPHL
90%
50%
10%
tTHL
VCC
0V
VOH
VOL
VCC
0V
VOH
VOL
Note : 1. Input waveform : PRR ≤ 1 MHz, duty cycle 50%, t_r ≤ 6 ns, t_f ≤ 6 ns
Rev.2.00 Mar 30, 2006 page 5 of 6