HD74HC620 查看數據表（PDF） - Renesas Electronics
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HD74HC620 Datasheet PDF : 12 Pages
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HD74HC620, HD74HC623
HD74HC623
VCC
VCC
Input
Pulse Generator
Zout = 50 Ω
GBA
GAB
S1
A1
B1
Output
1 kΩ S2
CL =
50 pF
OPEN
GND
VCC
TEST
tPLH / t PHL
tZH/ t HZ
tZL / t LZ
S2
OPEN
GND
VCC
Notes : 1. CL includes probe and jig capacitance.
2. A2–B2, A3–B3, A4–B4, A5–B5, A6–B6, A7–B7, A8–B8 are identical to above load circuit.
3. S1 is a input / output swich.
Waveforms
HD74HC620
• Waveform – 1
tr
tf
90 %
90 %
VCC
Input A or B
50 %
50 %
10 %
10 %
0V
tPHL
tPLH
Output B or A
90 %
50 %
10 %
tTHL
90 %
VOH
50 %
10 %
VOL
tTLH
Notes : 1. Input waveform : PRR ≤ 1 MHz, duty cycle 50%, tr ≤ 6 ns, tf ≤ 6 ns
2. The output are measured one at a time with one transition per measurement.
Rev.2.00 Mar 30, 2006 page 7 of 11
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