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Detailed Description
The MAX4581L/MAX4582L/MAX4583L are low-voltage,
CMOS analog ICs that operate from a single supply
of +2V to +12V. The MAX4581L is configured as an
8-channel multiplexer, the MAX4582L as two 4-channel
multiplexers, and the MAX4583L as three single-pole/
double-throw (SPDT) switches. These devices can han-
dle rail-to-rail analog signals with only 2nA of off-leakage
current at +25°C.
The MAX4581L/MAX4582L/MAX4583L are TTL/CMOS-
logic compatible with 0.8V to 2.0V logic thresholds for all
digital inputs when operating from a +12V supply.
Applications Information
Power-Supply Considerations
The MAX4581L/MAX4582L/MAX4583Ls? construction
is typical of most CMOS analog switches. The supply
input, VCC, is used to power the internal CMOS switches
and sets the limit of the analog voltage on any switch.
Reverse ESD protection diodes are internally connected
between each analog signal pin and both VCC and GND.
If any analog signal exceeds VCC or goes below GND,
one of these diodes conducts. During normal operation,
these reverse-biased ESD diodes leak, causing the only
current drawn from VCC or GND. Virtually all the analog
leakage current comes from the ESD diodes. Although
the ESD diodes on a given signal pin are identical, and
therefore fairly well balanced, they are reverse biased
differently by either VCC or GND and the analog signal.
This means that leakage varies as the analog signal var-
ies. The difference in the two diodes? leakage to VCC
and GND constitutes the analog signal-path leakage cur-
rent. Because there is no connection between the analog
signal paths and GND, all analog leakage current flows
between each pin and one of the supply terminals, not
to the other switch terminal. Because of this, both sides
of a given switch can show leakage currents of either the
same or opposite polarity.
VCC and GND power the internal logic and logic-level
translators, and set both the input and output logic limits.
The logic-level translators convert the logic levels into
switched VCC and GND signals to drive the gates of the
analog switches. This drive signal is the only connection
between the logic supplies (and signals) and the analog
supplies. The logic-level thresholds are TTL/CMOS com-
patible when VCC is +12V.
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute maxi-
mum ratings because stresses beyond the listed ratings
can cause permanent damage to the devices. Always
sequence VCC first, followed by the logic inputs and ana-
log signals.
Pin Nomenclature
The MAX4581L/MAX4582L/MAX4583L are pin compat-
ible with the industry-standard 74HC4051/74HC4052/
74HC4053 and the MAX4051/MAX4052/MAX4053.
Table 1. Truth Table/Switch Programming
X = Don’t care.
*C not present on MAX4582L.
Note: Input and output pins are identical and interchangeable. Either may be considered an input or output; signals pass equally well
in either direction.
ENABLE
INPUT
SELECT INPUTS ON SWITCHES
C* B A MAX4581L MAX4582L MAX4583L
H X X X All switches open All switches open All switches open
L L L L X–X0 X–X0, Y–Y0 X–X0, Y–Y0, Z–Z0
L L L H X–X1 X–X1, Y–Y1 X–X1, Y–Y0, Z–Z0
L L H L X–X2 X–X2, Y–Y2 X–X0, Y–Y1, Z–Z0
L L H H X–X3 X–X3, Y–Y3 X–X1, Y–Y1, Z–Z0
L H L L X–X4 X–X0, Y–Y0 X–X0, Y–Y0, Z–Z1
L H L H X–X5 X–X1, Y–Y1 X–X1, Y–Y0, Z–Z1
L H H L X–X6 X–X2, Y–Y2 X–X0, Y–Y1, Z–Z1
L H H H X–X7 X–X3, Y-Y3 X–X1, Y–Y1, Z–Z1
MAX4581L/MAX4582L/
MAX4583L
Low-Voltage, CMOS Analog
Multiplexers/Switches
www.maximintegrated.com Maxim Integrated
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