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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, 0.2Ω typ.
•
On-Resistance Flatness, <2Ω typ.
•
Low Off-Channel Leakage, <5nA @ +85°C
•
TTL/CMOS Logic Compatible
•
Fast Switching Speed, t
ON
<150ns
•
Guaranteed Break-Before-Make action (PS322) eliminates
momentary crosstalk
•
Rail-to-Rail Analog Signal Dynamic Range
•
Low Power Consumption, <1.25mW
•
MSOP Package Minimizes Board Area
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
<35ΩON-resistance. ON-resistance matching between channels is
within 2Ω. ON-resistance flatness is less than 4Ωover the specified
range. All three devices guarantee low leakage currents (<100pA
@25°C, <10nA @+85°C) and fast switching speeds (t
ON
<150ns). Break-before-make switching action protects against
momentary crosstalk (PS322).
For single-supply operation the PS323/PS324/PS325 are recom-
mended.
Applications
•
Audio Switching and Routing
•
Portable Instruments
•
Data Acquisition Systems
•·
Sample-and-Holds
•
Telecommunication Systems
•
Battery-Powered Systems
Functional Diagrams, Pin Configurations, and Truth Tables
PS320
NO1
COM1
IN2
V-
1
2
3
4
8
7
6
5
V+
IN1
COM2
NO2
NC1
COM1
IN2
V-
1
2
3
4
PS321
8
7
6
5
V+
IN1
COM2
NC2
N01
COM1
IN2
V-
1
2
3
4
PS322
8
7
6
5
V+
IN1
COM2
NC2
Top View
Top View
Switches shown for logic “0” input
Top View
PS320
Logic
Switch
PS321
Logic
Switch
Logic
PS322
Switch
1
Switch
2
0
1
O FF
ON
0
1
ON
O FF
0
1
O FF
ON
ON
O FF
1
PS8183D
01/11/01
PERICOM [ PERICOM SEMICONDUCTOR CORPORATION ]
