HP 5340A Service Manual

Model 5340A
Theory of Operation
Figure 4
- 24. Quad 2 - Input Multiplexer 1820 - 0616
I
4 - 56. This IC (Figure 4 - 25) selects 1 of 16 data sources and can be used for parallel - to - serial
conversion, multiplexing, or
as a five - variable function generator. Four data select lines are used
to select which input
is routed to the output. The select lines perform binary decoding. When the
strobe input
is driven low, the multiplexers are enabled. The truth table shows the logic require-
men? of the multiplexers. For example, when the strobe is low, and the data select lines are
ABCD, then input E3 is gated to the output W line.
Figure 4
- 25. Data Selectors/Multiplexers 1820 - 0640
DATA INPUTS DATA SELECT
/
A
\-
"CC 8 9 10 11 12 13 14 15 A R c
\
v
/
OUT - DATA
DATA INPUTS PUT SELECT
~
POSITIVE LOGIC
,I
,=S(ABCDE~ + ABCE~~ + ABCDE~ + ABCDE~ + ABcEE, + ABCDE~ + ABCDE, + ABCDE,
XBCDE, + A,@cD'E, + ABCDE,~ + ABCDE,, + fiBCDEIZ + ABCDE13 + ABCDE14 + ABCDE15)
4 - 17

HP 5340A Specifications

General

Brand	HP
Model	5340A
Category	Cash Counter
Language	English