HP 5340A Service Manual

Model 5340A
Theory of Operation
A3
86 -
c7 -
D4-
Figure 4 - 14. BCD to Decimal Decoder 1820 - 0426
-
16 50
15 El
8 52
9 a3
13 84
14 85
11
86
10 87
1 88
- 2 a9
10001
Input Loadlng Factor = 1
Total Power DissiDation = 105 mW typlpkg
01111111111011
11 11 11 101
10011111111110
TRUTH TABLE
INPUT 1 OUTPUT
DCBAIO 1234 56 789
00000111111111
001 01 101 11 11 11
001111101 1111
0100111101
010111111011
011 01 11 11 1011
31
Figure 4 - 15. Voltage Comparator/Buffer 1820 - 0475
V-
Note: Pin 4 connected to case.
4 - 37. Binary to Decimal Decoder 1820 - 0495
4 - 38. The decoder (Figure 4 - 16) acceptsfour bikary weighted inputs and provides oneof 16 out -
puts corresponding to the input code.
EO and El are low AND enable inputs. When EO and El
are both low, the inputs at A0 through A3 are decoded and the corresponding decimal output
goes
low. For example, when AO=l, A1=0, A2=0, and A3=1, then the 9 output goes low.
,,
i
I
4 - 1 1

HP 5340A Specifications

General

Brand	HP
Model	5340A
Category	Cash Counter
Language	English