MAX381 Maxim, MAX381 Datasheet - Page 8

• Manufacturer Part Number: MAX381
• Description: The MAX381/MAX383/MAX385 are precision, low-voltage analog switches
• Manufacturer: Maxim

The MAX381/MAX383/MAX385 switches operate with
±3.0V to ±8V bipolar supplies and a +3V to +15V single
supply. In either case, analog signals ranging from V+ to
V- can be switched. The Typical Operating Characteristics
graphs show the typical on-resistance variation with ana-
log signal and supply voltage. The usual on-resistance
temperature coefficient is 0.5%/°C (typ).
Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute maxi-
mum ratings, because stresses beyond the listed rat-
ings can cause permanent damage to the devices.
Always sequence V+ on first, then V-, followed by the
logic inputs, NO, or COM. If power-supply sequencing
is not possible, add two small signal diodes (D1, D2) in
series with supply pins for overvoltage protection
(Figure 1). Adding diodes reduces the analog signal
range to one diode drop below V+ and one diode drop
above V-, but does not affect the devices’ low switch
resistance and low leakage characteristics. Device
operation is unchanged, and the difference between
V+ and V- should not exceed 17V. These protection
diodes are not recommended when using a single 3V
supply.
Precision, Low-Voltage Analog Switches
8
______________________________________________________________Pin Description
__________Applications Information
* IN1 controls COM1 and COM3; IN2 controls COM2 and COM4.
MAX381
2–7, 12
10, 15
_______________________________________________________________________________________
9, 16
1, 8
11
13
14
—
Operation with Supply Voltages
MAX383
1, 3, 6, 8
2, 7, 12
10, 15
9, 16
PIN
4, 5
11
13
14
Overvoltage Protection
4, 5, 9, 16
MAX385
1, 3, 6, 8
2, 7, 12
10, 15
11
13
14
—
Other than ±5V
NAME
COM_
GND
N.C.
NO_
NC_
IN_*
V+
V-
Analog Switch Common Terminal
Not Internally Connected
Analog Switch Normally Open Terminal
Analog Switch Normally Closed Terminal
Logic Level Input (Normally Low)
Analog Signal and Logic Positive Supply Input
Logic Negative Supply Input (Ground)
Analog Signal Negative Supply Input
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes
COM
FUNCTION
*
*
V-
V+
-5V
+5V
D1
D2
* INTERNAL PROTECTION DIODES
*
*
MAX381
MAX383
MAX385
NO