MAX4508CSE データシートの表示（PDF） - Maxim Integrated
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MAX4508CSE Datasheet PDF : 16 Pages
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Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 Multiplexers
MAX4508 (Single 8-to-1 Mux)
PIN NAME
FUNCTION
1
A0
Address Bit 0
2
EN
Mux Enable
3
V-
Negative Supply Voltage
4
NO1 Channel Input 1
5
NO2 Channel Input 2
6
NO3 Channel Input 3
7
NO4 Channel Input 4
8
COM Analog Output
9
NO8 Channel Input 8
10
NO7 Channel Input 7
11
NO6 Channel Input 6
12
NO5 Channel Input 5
13
V+
Positive Supply Voltage
14
GND Ground
15
A2
Address Bit 2
16
A1
Address Bit 1
Pin Descriptions
MAX4509 (Dual 4-to-1 Mux)
PIN NAME
FUNCTION
1
A0
Address Bit 0
2
EN
Mux Enable
3
V-
Negative Supply Voltage
4
NO1A Channel Input 1A
5
NO2A Channel Input 2A
6
NO3A Channel Input 3A
7
NO4A Channel Input 4A
8
COMA Mux Output A
9
COMB Mux Output B
10
NO4B Channel Input 4B
11
NO3B Channel Input 3B
12
NO2B Channel Input 2B
13
NO1B Channel Input 1B
14
V+
Positive Supply Voltage
15
GND Ground
16
A1
Address Bit 1
Truth Tables
MAX4508 (Single 8-to-1 Mux)
A2
A1
A0
EN
x
x
x
0
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
1
ON SWITCH
None
NO1
NO2
NO3
NO4
NO5
NO6
NO7
NO8
MAX4509 (Dual 4-to-1 Mux)
A1
A0
EN
COMA
x
x
0
0
0
1
0
1
1
1
0
1
1
1
1
None
NO1A
NO2A
NO3A
NO4A
COMB
None
NO1B
NO2B
NO3B
NO4B
Detailed Description
Traditional fault-protected multiplexers are constructed
with three series FET switches. This produces good off
protection, but limits the switches input voltage range
to as much as 3V below the supply rails, reducing its
usable dynamic range. As the voltage on one side of
the switch approaches within about 3V of either supply
rail (a fault condition), the switch impedance increases,
limiting the output signal range to approximately 3V
less than the appropriate polarity supply voltage.
The MAX4508/MAX4509 differ considerably from tradi-
tional fault-protected multiplexers, offering several
advantages. First, they are constructed with two paral-
lel FETs, allowing very low resistance when the switch
is on. Second, they allow signals on the NO_ pins that
are within or beyond the supply rails to be passed
through the switch to the COM terminal. This allows rail-
to-rail signal operation. Third, when a signal VNO_
exceeds the supply rails (i.e., a fault condition), the
voltage on COM_ is limited to the supply rails.
Operation is identical for both fault polarities.
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