S-I4
i
Clear
‘c|¢¢k
D
Q
Q
L
X
X
i
1-
H
H
T
H
|
H
L
H
T
I-
I-
f
H
L
X
Qu
Q0
H D I 4 E S H 5 F ! -
(Quadruple
D-tl/535
Ed3e’T"ig3 ’ed
Fiip
Flops
with
Clear)
(SV)
_
"
sq
(gg
Vcc
40
40
4
3
3
|5’
15
as
[is
*Z
"
O
9
~
*
.
\
2
3
5
6
1
G.,
,Q
16
no
zo
25
zo
sno
(cm
5-44
V
SNI4ES245Ni
(Hex
Bus
Drivers
and
Receivers
with
Three-State
Outputs)
C q d ( m R )
Function
L
L
H § L c ~ ’ A g H t
I
Enable
Direction
I
L
H
A?
»BO¥1§
ut
EP
I
I
H
I
X
LHigh
Imped
nce
x".Accept
both
H
and
L
(SV)
Vcc
Encbln
G
ai
In
HD74LS174P,
Q output
does
not
exist.
X...Acceptable
both
H
and
L.
+...Rising
edge.
_
Qo,
Qo...Previous
status
of
Q,
§.
5-Ala
consists
of
a
lines
Flip
Flop.
Difference
betweer
HD74LS1Z§P
and
this
chip
is
the
existence
of
reverse
output
Q
pin.
The
I/O
relation
and
time
chart
is
the
same
as
HD74LSl74P.
5-45
Consistsof
Bi-directional
bus
buffer
(8
input/
output).
By
enable
input
(Ei
Low
and
setting
direction
control
(DIR)
signal
transfer
direction
A+B
is
switched
to
B+A.
When
enable
input
(Ødis
high,
no
signal
communication
between
A
and
B
is
done
and
keepsthree
state
High
Impedance.
\= l
I9
IB
V
V
AA
az
as
B4
as
as
37
as
|7
¢§
|5
M
I3
IZ
H
I
I
I
I
Y
l
GND
i
v
v
v
i
-L I W i
I
|||
:Za
43|
»44
|5\
Q61
|71
L81
i9\
P01
Al
A2
A3
A4
A5
A6
A7
A6
DIR
5-45
Содержание MB-6890
Страница 1: ...HITACHI PERSONAL COMPUTER MB 6890 SERVICE MANUAL I R 0 3012 98 ...
Страница 2: ...HITACHI PERSONAL COMPUTER MB 6890 SERVICE MANUAL ev O 30 1 2 1 ...
Страница 42: ... one of page 40 44 missing ...
Страница 122: ......
Страница 123: ......