HD74HC620_15 Datasheet, PDF (9/14 Pages) Renesas Technology Corp – Octal Bus Transceivers (with inverted 3-state outputs)

HD74HC620, HD74HC623
HD74HC623
VCC
VCC
Input
Pulse Generator
Zout = 50 Ω
GBA
GAB
S1
A1
B1
Output
1 kΩ _S2
C_L =
50 pF
OPEN
GND
V_CC
TEST
t_PLH / t _PHL
t_ZH/ t _HZ
t_ZL / t _LZ
S2
OPEN
GND
V_CC
Notes : 1. C_L 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 %
V_CC
Input A or B
50 %
50 %
10 %
10 %
0V
t_PHL
t_PLH
Output B or A
90 %
50 %
10 %
t_THL
90 %
V_OH
50 %
10 %
V_OL
t_TLH
Notes : 1. Input waveform : PRR ≤ 1 MHz, duty cycle 50%, t_r ≤ 6 ns, t_f ≤ 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