PS391/PS392/PS393

Precision, Quad, SPST Analog Switches

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12

PS8168E

09/16/02

Ordering Information

Overvoltage Protection

Proper power-supply sequencing is recommended for all CMOS

devices. Do not exceed the absolute maximum ratings, because

stresses beyond the listed ratings may cause permanent damage

to the devices. Always sequence V+ on first, followed by V-, and

then the logic inputs. If power-supply sequencing is not possible,

add two small signal diodes or two current limiting resistors in

series with the supply pins for overvoltage protection (Figure 9).

Adding diodes reduces the analog signal range, but low switch

resistance and low leakage characteristics are unaffected.

Figure 9. Overvoltage protection is accomplished using two

external blocking diodes or two current limiting resistors.

V+

Positive Supply

COM

NO

Vg

V-

Pericom Semiconductor Corporation

2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com

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