Hitachi MB-6890, Руководство по обслуживанию

Страница: 38 / 123

ABA1-zzz
HD74§525ZE§
(Quadruple 2-Line
to
I-Line
Data
Selectors/Multiplexers
(with Noninverted Three-State
Outputs))
uw
v¢¢?:‘Sf» rf‘f=I4A
48 4Y
SA sa av
ue
us
m
I3
I2 ||
m
9
--__-
oc an as 4V JA 38
5
n
IA ua nv ZA 2B v
§11__
1 2 3
fi* *S
7
v5
som IA na
Iv
ZA ze zv GND
5-46
546
In ut
Output
oc
|
s A
B
H
x
I
x
X
I
Z
f
L L
I
L x
L
L L
I
H
I
x
H
L H
I
x
L
L
H
L H
x H
I
X
;
-Kclcept
e
botl
H
and
L
Z;
High
Impedance
(OFF)
H D Z 4 E $ » 2 8 3 E ‹
(4-bit Binary
Full
Adder)
( 5V)
vtc BJ A3 Is
A4 B4
Z4 C4
Data
Selectors/Multiplexers
with three
State
outputs
Inputs
consist
from 2
data (A,B) which decide
status
of each
output and
select,
output
control which
are common
for 4
outputs. When
output
control is
H,
all the
outputs
go
High
Impedance, and when
L,
output
the
status data B if
select is
H. If select
is
L,
output
the
status of data
A.
4 bit
adder. Each bit
sum
is obtained
by the
B m B B B
m m E
Z
output.
The
signal from 4 bit
output or
more
higher bit
can
be
obtained
at
CL# output.
Bs AJ 2|
44 B4 I*
I:
C*
B1 It
2| M 3*
5
| _
in _3_ ‘4_
>5_ 767
S
E2 B2 A2 2| Al
Br CO- GND
S-47
547
Sma:
Out ut
C.:-Lo
C = ¢ H l
Input
c=l_]§_n Ctshgn
The input condition
of
Al, Bl, AZ, B2,
and
CO
is
’
used to decide the
El, Z2 and
internal carrier
C2
c2z’%:
2
A. B, A. B. Z,
Z.
C. EJ
L
L L L L L L H
H
L L L H L L L
LIH
L
LVHpL
L L
H
H L L L H L H
L
L H L L H L H
H
L
H L H H L L
LHHILHHLL
HiHHLLLHH
I I I I I I I
1
~
1
L
|
L
|
H
|
L
|
H
|
L
1
H
HLLHHH
L L
L
H L H
H H
L
L
HHLHILLH_H
L
L H
HILKL H’
W
_H
HLHHHLHL
I
LHIHHHLHL
I
HIHr"HIHII.IHIHIYH_
value.
The
value of
CZ, A3,
B3, A4
and
B4
is
used
to
decide