Spectravideo SVI 318 Service – Technical Manual page 131

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( 3 )
E l e c t r i c a l
C h a r a c t e r i s t i c s
( 1 )
S ig na l
l e v e l s
A l l
i n p u t / o u t p u t
" H I GH"
" LOW'"
l e v e l
-
-
Tf
Inpu t /Ou t p u t
( 2 )
Inpu t / o u t p u t
*
Input
The
i n p u t
*
O u t p u t
The
ou t p u t c o r r e s p onds
l oa d c o r r e sp ond s t o
74 LS04
s i g na l s a r e
+ 2 . 4
l e ve l
-
+ 0 . 0
-
'
I
I
T --: �
Tr
c on d i t i o ns
s
s
g
a
l
a r e pu l l e d u p
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n
s i g na l s
l o a d c o r re s p o n d s t o one 74LS04
s i g na l s
one
'
'
l l OOOpF
equivalent
74 LS04
equivalen t
4 . 98
TT L
l ev e l .
s . ov
h
e P r i n t e r i np u t t
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t
0 . 4V
Tf and Tr
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t o a 7 4 LS04 .
The recomme nded
LSTTL l oa d .
+S ( V ]
t oo n '..
t ok n
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, _
t._
These are a ttached only
to the INITI AL and
signals.
+S ( V )
I Ok il
e
m i
s
r
l
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1 00 ns or l e s s
=
h
t
t im i n g
ou tput
I n p u t
Ou tpu t

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