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PS394

Precision, Quad, SPDT, 17VAnalog Switch

2

PS8444

01/13/00

Note1:

Signals on NC, NO, COM, or IN exceeding V+ or V– are clamped

by internal diodes. Limit forward diode current to maximum

current rating.

CAUTION

Stresses beyond those listed under “Absolute Maximum Ratings”

may cause permanent damage to the device. This is a stress only

rating and operation of the device at these or any other conditions

beyond those indicated in the operational sections of this specifi-

cation is not implied.

AbsoluteMaximumRatings

Voltages Referenced to GND

V+ ....................................................................–0.3Vto+17V

V– ....................................................................+0.3Vto–17V

V+toV– ..........................................................–0.3Vto+17V

or 30mA, whichever occurs first

Continuous Current, Any Pin ...................................... 30mA

Peak Current, Any Pin

(pulsed at 1ms, 10% duty cycle max.) ..................... 100mA

PlasticDIP(derate10.53mW/°Cabove+70°C) ..... 842mW

Narrow SO (derate 8.70mW/°C above +70°C) ...... 696mW

Operating Temperature Ranges

PS394C_P ...................................................... 0°Cto+70°C

PS394E_P .................................................. –40°Cto+85°C

Storage Temperature Range .......................–65°Cto+150°C

Lead Temperature (soldering, 10sec) .........................+300°C

ApplicationsInformation

OperationwithSupplyVoltagesOtherthan±5V

The PS394 switch operates with ±2.7V to ±8V bipolar supplies and

a+2.7Vto+15Vsinglesupply.Ineithercase,analogsignalsranging

from V+ to V- can be switched. The Typical Operating Character-

istics 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-SupplySequencingandOvervoltageProtection

Do not exceed the absolute maximum ratings, because stresses

beyond the listed ratings may cause permanent damage to the

device. Proper power-supply sequencing is recommended for all

CMOS devices. Always apply V+, followed by V- (when using split

supplies) before applying analog signals or logic inputs, especially

if the analog or logic signals are not current-limited. If this sequenc-

ing is not possible and if the analog or logic inputs are not current

limited to less than 30mA, add a single diode (D1) for single-supply

operation(Figure1).Ifusingdualsuppliesoriftheanalogsignalcan

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.Forexample,with±5Vsupplies,analogsignalsupto±8.5Vwill

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.

+5V

+5V

D1

D1

V+

V–

COM

NO or NC

*

*

*

*

*Internal Protection Diodes

Figure1.OvervoltageProtectionusingBlockingDiodes