Datasheet

__________Applications Information
Power-Supply Considerations
The MAX4524/MAX4525’s construction is typical of
most CMOS analog switches. They have two supply
pins: V+ and GND. V+ and GND are used to drive the
internal CMOS switches and set the limits of the analog
voltage on any switch. Reverse ESD-protection diodes
are internally connected between each analog signal
pin and both V+ and GND. If any analog signal
exceeds V+ or GND, one of these diodes will conduct.
During normal operation, these (and other) reverse-
biased ESD diodes leak, forming the only current drawn
from V+ or GND.
Virtually all the analog leakage current comes from the
ESD diodes. Although the ESD diodes on a given sig-
nal pin are identical, and therefore fairly well balanced,
they are reverse-biased differently. Each is biased by
either V+ or GND and the analog signal. This means
that leakage will vary as the signal varies. The differ-
ence in the two diode leakages to the V+ and GND
pins constitutes the analog signal-path leakage current.
All analog leakage current flows between each pin and
one of the supply terminals, not to the other switch ter-
minal. This is why both sides of a given switch can
show leakage currents of either the same or opposite
polarity.
MAX4524/MAX4525
Low-Voltage, Single-Supply
Multiplexer and Switch
_______________________________________________________________________________________ 7
______________________________________________Test Circuits/Timing Diagrams
50%
t
TRANS
V+
0V
V
NO0
V
OUT
V
ADD
0V
90%
90%
t
TRANS
50%
t
TRANS
V+
0V
V
NC
V
OUT
V
ADD
0V
90%
90%
t
TRANS
V
ADD
V+
V
OUT
GND
V+
ADDB
ADDA
INH
NO0
NO1–NO2
NO3
COM
V+
MAX4524
300Ω
50Ω
35pF
V+
V
OUT
GND
V+
ADD
V
ADD
INH
NO
NC
COM
V+
MAX4525
300Ω
50Ω
35pF
REPEAT TEST FOR EACH SECTION.
Figure 1. Address Transition Time