MAX328EWE+T Maxim Integrated Products, MAX328EWE+T Datasheet - Page 8

• Manufacturer Part Number: MAX328EWE+T
• Description: IC MULTIPLEXER 8X1 16SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX328EWE+T

• Function: Multiplexer
• Circuit: 1 x 8:1
• On-state Resistance: 3.5 kOhm
• Voltage Supply Source: Single, Dual Supply
• Voltage - Supply, Single/dual (±): 10 V ~ 30 V, ±5 V ~ 18 V
• Current - Supply: 4.5µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 4 is a typical circuit for converting the
MAX328/MAX329 into a fault-tolerant mux. In this
application, the internal diodes limit the voltage at the
MAX328 input to ±15.7V (±15V supplies). No external
diodes need to be added with the MAX328/MAX329,
unlike conventional multiplexers requiring external
diodes.
The resistors, R, need to be 39kΩ or higher to limit the
power dissipation in the resistor when a 120V AC fault
occurs (i.e., power dissipation is (120-16)
0.28W. This is why a 1/2/W resistor is needed). The circuit
withstands an indefinite fault to a 120V AC line with no
damage to any component.
In addition to allowing fault-protection, the guaranteed
low leakage of the MAX328/MAX329 also reduces signal
errors. The circuit in Figure 4 produces an error voltage of
10pA (max leakage) x 39kΩ or 0.39µV at room tempera-
ture and 39µV at +125°C. Therefore, for 10V signals, the
MAX328/MAX329 allows 17-bit resolution (38µV = 1LSB)
over the full temperature range.
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
Figure 4. Fault-Tolerant MUX (indefinitely withstands 120V AC
8
_______________________________________________________________________________________
R = 39kΩ 1/2W
S
S
S
S
1
2
3
4
fault voltages)
-15V
1µF
R
R
R
R
V
OUT
Applications Information
EN
A
0
1
2
6
3
4
5
7
8
MAX328
MAX329
16
15
14
13
12
11
10
9
A
A
1
2
1µF
R
R
R
R
+15V
2
/39kΩ or
S
S
S
S
5
6
7
8
GND
GND
S4B
S3B
S2B
S1B
S7
S6
S5
V+
V+
10
11
12
13
14
10
11
12
13
14
15
A2
15
A1
(2.64mm)
A1
MAX328
(2.64mm)
MAX329
S8
DB
0.104”
16
0.104”
16
9
9
Chip Topographies
D
DA
8
A0
8
A0
1
1
EN
EN
2
2
7
6
5
4
3
7
6
5
4
3
S4
S3
S2
S1
V-
S4A
S3A
S2A
S1A
V-
(2.90mm)
(2.90mm)
0.118”
0.118”