1

PS8183D

01/11/01

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PS320/PS321/PS322

Precision, Dual-Supply Analog Switches

Features

••••• Low On-Resistance (17W typ.) Minimizes Distortion and

Error Voltages

• Low Glitching Reduces Step Errors in Sample-and-Holds

• Split-Supply Operation (±3V to ±8V)

• Improved Second Sources for MAX320/MAX321/MAX322

• On-Resistance Matching Between Channels, 0.2Ωtyp.

• On-Resistance Flatness, <2Ω typ.

• Low Off-Channel Leakage, <5nA @ +85°C

• TTL/CMOS Logic Compatible

• GuaranteedBreak-Before-Makeaction(PS322)eliminates

momentary crosstalk

• Rail-to-Rail Analog Signal Dynamic Range

• Low Power Consumption, <1.25mW

• MSOP Package Minimizes Board Area

Applications

• Audio Switching and Routing

• Portable Instruments

• Data Acquisition Systems

•· Sample-and-Holds

• Telecommunication Systems

• Battery-Powered Systems

Switches shown for logic “0” input

Top View

Functional Diagrams, Pin Configurations, and Truth Tables

Top View

Top View

Description

The PS320/PS321/PS322 are improved high-precision, medium volt-

age analog switches designed to operate with +3V to +8V power

supplies. The PS320 is a dual, single-pole single-throw (SPST),

normally open (NO) switch. The PS321 has the same pinout as the

PS320 but it has two normally closed (NC) switches. The PS322 has

one normally open (NO) and one normally closed (NC) switch per

package. When on, each switch conducts current equally well in

either direction. In the off state, each switch blocks voltages up to

the power-supply rails.

With ±5V power supplies, the PS320/PS321/PS322 guarantee

<35

ΩON-resistance. ON-resistance matching between channels is

within 2

Ω. ON-resistance flatness is less than 4Ωover the specified

range. All three devices guarantee low leakage currents (<100pA

<150ns). Break-before-make switching action protects against

momentary crosstalk (PS322).

For single-supply operation the PS323/PS324/PS325 are recom-

mended.

6

7

8

5

1

2

3

4

NC1

COM1

IN2

V-

V+

COM2

NC2

IN1

PS321

6

7

8

5

1

2

3

4

N01

COM1

IN2

V-

V+

COM2

NC2

IN1

PS322

6

7

8

5

1

2

3

4

NO1

COM1

IN2

V-

V+

COM2

NO2

IN1

PS320

0

2

3

S

P

c

i

g

o

Lh

c

t

i

w

S

0

1

F

F

O

N

O

1

2

3

S

P

c

i

g

o

Lh

c

t

i

w

S

0

1

N

O

F

F

O

2

2

3

S

P

c

i

g

o

L

h

c

t

i

w

S

1

h

c

t

i

w

S

2

0

1

F

F

O

N

O

N

O

F

F

O