MAX394 Datasheet, PDF (9/12 Pages) Maxim Integrated Products – Low-Voltage, Quad, SPDT, CMOS Analog Switch

Low-Voltage, Quad, SPDT,
CMOS Analog Switch
_____________________Pin Description
PIN
1, 10, 11, 20
NAME
IN1–IN4
FUNCTION
Logic-Level Inputs
2, 9, 12, 19
NO1–NO4
Normally Open Switches
3, 8, 13, 18
4, 7,14, 17
5
6
15
16
COM1–COM4
NC1–NC4
V-
GND
N.C.
V+
Common Switch Poles
Normally Closed Switches
Negative Power Supply
Ground
Not Internally Connected
Positive Power Supply
__________Applications Information
Operation with Supply Voltages
Other than ±5V
The MAX394 switch operates with ±2.7V to ±8V bipolar
supplies and a +2.7V 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 analog signal
and supply voltage. The usual on-resistance temperature
coefficient is 0.5%/°C (typ).
Power-Supply Sequencing
and Overvoltage Protection
Do not exceed the absolute maximum ratings, because
stresses beyond the listed ratings may cause perma-
nent damage to the device. Proper power-supply
sequencing is recommended for all CMOS devices.
Always apply V+, followed by V- (when using split sup-
plies) before applying analog signals or logic inputs,
especially if the analog or logic signals are not current-
limited. If this sequencing is not possible and if the ana-
log or logic inputs are not current-limited to less than
+5V
D1
V+
MAX394
*
*
COM
NO or NC
*
*
V-
D2
-5V ^{* INTERNAL PROTECTION DIODES}
Figure 1. Overvoltage Protection Using Blocking Diodes
30mA, add a single diode (D1) for single-supply opera-
tion (Figure 1). If using dual supplies or if the analog
signal can dip below ground in single-supply operation,
add two small signal diodes (D1, D2), as shown in
Figure 1. Adding protection diodes reduces the analog
signal range to a diode drop above V- for D2. Leakage
is not affected by adding the diodes. On-resistance
increases by a small amount at low supply voltages.
Maximum supply voltage (V- to V+) must not exceed
17V.
Adding diodes D1 and D2 also protects against some
overvoltage situations. With the circuit of Figure 1, if the
supply voltage is below the absolute maximum rating
and if a fault voltage up to the absolute maximum rating
is applied to an analog signal pin, no damage will
result. For example, with ±5V supplies, analog signals
up to ±8.5V will not damage the circuit of Figure 1. If
only a single fault signal is present, the fault voltage
can go to +12V or -12V without damage.
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