Daewoo DTU-28A8FZP, Руководство по обслуживанию

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CP-530 Service Manual
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4.12 HEF4052 (Multiplexer)
The HEF4052B is a dual 4-channel analogue multiplexer/demultiplexer with common channel
select logic.
Each multiplexer/demultiplexer has four independent inputs/outputs (Y0 to Y3) and a common
input/output (Z).
The common channel select logic includes two address inputs (A0 and A1) and an active LOW
enable input (E).
Both multiplexers/demultiplexers contain four bidirectional analogue switches, each with one side
connected to an independentinput/output (Y0 to Y3) and the otherside connected to a common
input/output (Z).
With E LOW, one of the four switches is selected (low impedance ON-state) by A0 and A1. With E
HIGH, all switches are in the high impedance OFF-state, independent of A0 and A1.VDD and VSS
are the supply voltage connections for the digital control inputs (A0, A1 and E). The VDD to VSS
range is 3 to 15 V. The analogue in/outputs (Y0 to Y3, and Z)
can swing between VDD as a
positive limit and VEE as a negative limit. VDD - VEE may not exceed 15 V. For operation as
a digital multiplexer/demultiplexer, VEE is connected to VSS (typically ground).
4.12.1 Pinning and function table
INPUT
A
1
L L L
L
H
H
X
H
L
H
X
L
L
L
H
A
0
E
CHANNEL
ON
Y
0A
-Z
A
; Y
0B
- Z
B
Y
1A
-Z
A
; Y
1B
- Z
B
A
2A
-Z
A
; Y
2B
- Z
B
A
3A
-Z
A
; Y
3B
- Z
B
none
Fig.2 Pinning diagram
FUNCTION TABLE
Fig.3 Schematic diagram(one switch)