Service manual

SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS
(continued)
HEF4053
Triple 2-channel Analog Multiplexer/Demultiplexer
1. Description
The HEF4053 is a triple 2-channel analog
multiplexer/demultiplexer with a common enable
input (E). Each multiplexer/demultiplexer has
two independent inputs/outputs (Y
0
and Y
1
), a
common input/output (Z), and select inputs (Sn).
Each also contains two-bidirectional analog
switches, each with one side connected to an
independent input/output (Y
0
and Y
1
) and the
other side connected to a common input/output
(Z).
With (E) LOW, one of the two switches is
selected (low impedance ON-state) by Sn. With E
HIGH, all switches are in the high impedance
OFF-state, independent of S
A
to S
C
.
V
DD
and V
SS
are the supply voltage connections
for the digital control inputs (S
A
to S
C
and E).
The V
DD
to V
SS
range is 3 to 15V.The analog
inputs/outputs (Y
0
,Y
1
and Z) can swing between
V
DD
as a positive limit and V
EE
as a negative limit.
V
DD
-V
EE
may not exceed 15 V.
For operation as a digital multiplexer/demultiplexe
r, V
EE
is connected to V
SS
(typically ground).
2. Block Diagrams
Fig. 11
17