HP 3320A Operating And Service Manual page 111

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22
Z
RevA
NOTE 2: (Cont'd)
NOTE 3: BCD Low true logic, switch contact{s) to Ground is true
state.
TO XA 20A
A20
hp
Part No. 03320-66520
COMPONENT
A CIRCUIT
INPUT
DECIMAL OUTPUT
12 13 14 15
1
2 3 4 5 6 7
9 10 11
L
L L L L H
H H H H H H H H
CODE
L L L '0
H
,
H H H H H H H H
Digit 1 2
L
L H L H H
,
H H H H
H H H
4
8
L
L H H H H H L H H H H H H
L H L L
H H H H L H H H H H
0 0 0 0 0
L
H
L
H H H H H H L H
H H H
1 1 0 0 0
L
H H
L
H H H H H H L H H
H
2 0 1 0 0
L H H H H H H H
H H H
L
H H
3
1 1 0 0
H L L L H H H H H
H
H H L
H
4
0 0 1 0
H L
L
H H H H H H H H H H L
H L H L H H H
H H H H H H H
5
1 0 1 0
H
L
H H H H H H H H H H H H
6 0 1 1 0
H H L L H H H H H H H H H H
7
1 1 1 0
H H L H H H H H H
H H H H H
8 0 0 0 1
H H H
L
H H H H H H H H H H
H H H
H
H H H H H H H H H H
9
1 0 0 1
n
=
12
=
34
=
I
=
a
=
0
I
-
=
=
..
a:
=
=
a:
U
=
en
I
=
0
=
N
=
-
<{
=
=
...,
x
8
a
=
-
=
=
~
0
n
=
I-
=
=
0
=
a
=
>-
I-
=
=
z
=
"'
10= I
=
z
~
G::J
'"
N
=
0
=>
a:
0-
' - -
a:
=
:>
u
I
U
=
0
a:
=
u u
= =
4748
=
4950
A
0000000000000000000000
3320A-B-3084
I
NOTE 2: On A20lC5, input at pin 12 is hard wired low,and output
pins9,10,and 11 are not used IN/Cl.
NOTE 1: 9'5 Complement Circuitry:
INPUT
9's COMPLEMENT
Digit
1 2
4 8
1 2
4 8
0
H H H
H H L
L H
1
L
H H
H L L
L H
2
H L
H H
H H H L
3
L L
H H L
H
H
L
4
H H
L
H H L
H
L
5
L
H L
H
L
L
H
L
6
H L
L
H H H L L
7
L L
L
H L H L L
8
H
H H L
H L L L
9
L
H
H L L L L
L
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