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HD74HC377 Datasheet, PDF (4/7 Pages) Hitachi Semiconductor – Octal D-type Flip-Flops (with Enable)
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HD74HC377
Test Circuit
VCC
VCC
Output
Input
Pulse Generator
Zout = 50 Ω
Input
Pulse Generator
Zout = 50 Ω
Enable G Q
Clock
Output
CL = 50 pF
D
Q
CL = 50 pF
Note : 1. CL includes probe and jig capacitance.
Waveforms
• Waveform – 1
tf
Input G
90 %
10 %
tf
90 %
Input CLK
10 %
Input D
10 %
Output Q
Output Q
tr
tW
10 %
tr
90 %
50 %
tsu
90 %
50 %
50 %
tW
tf
90 %
50 %
th
tPLH
tsu
10 %
50 %
th
tPHL
50 %
tPHL
90 %
90 %
10 %
tTLH
50 %
10 %
90 %
50 %
10 %
tPLHtTHL
90 %
50 %
10 %
50 %
tTHL
tTLH
• Waveform – 2
tf
tr
Input G
90 %
50 %
10 %
tsu
10 %
th
90 %
50 %
tsu
50 %
th
Input CLK
50 %
10 %
90 %
90 %
10 %
50 %
tr
tf
Note: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, tr ≤ 6 ns, tf ≤ 6 ns
VCC
GND
VCC
GND
VCC
GND
VOH
VOL
VOH
VOL
VCC
GND
VCC
GND
Rev.2.00 Mar 30, 2006 page 4 of 6
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