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Número de pieza
componentes Descripción
HD74BC640A Ver la hoja de datos (PDF) - Hitachi -> Renesas Electronics
Número de pieza
componentes Descripción
Fabricante
HD74BC640A
Octal Bus Transceivers With 3 State Outputs
Hitachi -> Renesas Electronics
HD74BC640A Datasheet PDF : 9 Pages
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HD74BC640A
Test Circuit
V
CC
Input
Pulse
Generator
Z
out
= 50
Ω
V
CC
G
A1
S1
B1
Output
C
L
=
50 pF
500
Ω
450
Ω
50
Ω
Scope
DIR
OPEN
*4
7V
Notes:
1. C
L
includes probe and jig capacitance.
2. A2-B2 to A8-B8 are identical to above load circuit.
3. S1: Input-Output change switch.
4. Open: t
PLH
, t
PHL
, t
ZH
t
HZ
7 V: t
ZL
, t
LZ
Waveforms-1
t
f
t
r
Input
90 %
1.5 V
10 %
t
PLH
90 %
3V
1.5 V
10 %
0V
t
PHL
Output
V
OH
1.5 V
1.5 V
V
OL
6
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