21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PS320/PS321/PS322
Precision, Dual-Supply Analog Switches
Features
•
Low On-Resistance (17ohms 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, 0.2ohm typ.
•
On-Resistance Flatness, <2ohm 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
<35ohm ON-resistance. ON-resistance matching between channels
is within 2ohm. ON-resistance flatness is less than 4ohm over 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
PS8183E
06/10/02
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PS320/PS321/PS322
Precision, Dual-Supply Analog Switches
Absolute Maximum Ratings
Voltages Referenced to V
V+ ...................................................................... -0.3V to +17V
V
IN
, V
COM
, V
NC
, V
NO .............................
(V-) -2V to (V+) +2V
............................................... or 30mA, whichever occurs first
Current (any terminal) ..................................................... 30mA
Peak Current, COM, NO, NC
(pulsed at 1ms, 10% duty cycle) ................................... 100mA
ESD per Method 3015.7 ............................................. > 2000V
Note 1:
Signals on NC, NO, COM, or IN exceeding V+ or V- are clamped
by internal diodes. Limit forward diode current to maximum current
rating
(1)
Thermal Information
Continuous Power Dissipation
Plastic DIP (derate 6mW/ ºC above +70ºC) .................... 500mW
Narrow SO (derate 6mW/ ºC above +70ºC) .................... 450mW
MSOP (derate 4mW/ ºC above +70ºC) ........................... 330mW
Storage Temperature ........................................ -65ºC to +150ºC
Lead Temperature (soldering, 10s) ................................ +300ºC
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 specification is not implied.
Electrical Specifications - Dual Supplies
(V± = ± 5V ±10%, V
INH
= 3.5V, V
INL
= 1V)
Parame te r
Analog Switch
Analog Signal Range
(3)
ON- Resistance
V
AN ALO G
R
O N
V+ = 4.5V, V = 4.5V,
V
N O
or V
N C
= ±3.5V
I
C O M
= 1mA,
V+ = 5V, V = 5V
V
N O
or V
N C
= ±3V,
I
C O M
= 1mA,
V+ = 5V, V = 5V,
I
C O M
= 1mA ,
V
N O
or V
N C
= ±3V
V+ = 5.5V, V = 5.5V,
V
C O M
= ±4.5V,
V
N O
or V
N C
= ±4.5V
V+ = 5.5V, V = 5.5V
V
C O M
= ±4.5V,
V
N O
or V
N C
= ±4.5V
V+ = 5.5V , V = 5.5V,
V
C O M
= ±4.5V
V
N O
or V
N C
= ±4.5V
Full
25
Full
25
Full
25
Full
25
Full
25
Full
25
Full
0.1
5
0.1
5
0.2
10
0.04
0.01
0.01
1
0.3
V
16
V+
35
45
2
4
4
6
0.1
5
0.1
5
0.2
10
continued next page
Symbol
Conditions
Te mp. (°C)
M in.
(2)
Typ.
(1)
M ax.
(2)
Units
V
ON- Resistance Match
Between Channels
(4)
D
R
O N
ohm
ON- Resistance Flatness
(5 )
R
FLAT(O N )
NO or NC Off Leakage
Current
(6)
COM Off Leakage
Current
(6)
COM On Leakage
Current
(6)
I
N O (O FF)
or
I
N C (O FF)
I
C O M(O FF)
nA
I
C O M(O N )
2
PS8183E
06/10/02
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PS320/PS321/PS322
Precision, Dual-Supply Analog Switches
Te mp.
(°C)
M in.
(1)
Typ.
(2)
M ax.
(1)
Units
Electrical Specifications - Dual Supplies
(V± = ± 5V ±10%, V
INH
= 3.5V, V
INL
= 1V) continued
Parame te r
Logic Input
Input Current with
Input Voltage High
Input Current with
Input Voltage Low
Logic High Input
Voltage
Logic Low Input
Voltage
Dynamic
Turn- On Time
t
O N
t
O FF
t
D
Q
O
IRR
X
TALK
C
(O F F )
C
C O M (O F F )
C
C O M (O N )
PS322 only, R
L
= 300ohm, C
L
= 35pF, Figure 3
C
L
=1nF, V
GEN
= 0V, R
GEN
= 0ohm, Figure 4
R
L
= 50ohm, C
L
= 5pF, f = 1MHz, Figure 5
R
L
= 50ohm, C
L
= 5pF, f = 1MHz, Figure 6
f = 1MHz, Figure 7
f = 1MHz, Figure 7
f = 1MHz, Figure 8
25
25
V
C O M
= ±3V,
Figure 2
Full
25
Full
2
I
IN H
I
IN L
V
IN H
V
IN L
V
IN
= 3.5V, all others = 0V
V
IN
= 0V, all others = V+
V+ = 5V ±10%, V = V+
3V < V+ < 8V, V = V+
V+ = 5V ±10%, V = V+
3V < V+ < 8V, V = V+
Full
0.5
0.5
3.5
Symbol
Conditions
0.005
0.005
0.5
0.5
mA
0.6V+
1
0.3V+
V
65
150
175
Turn- Off Time
Break- Before- Make
Time Delay
(3)
Charge Injection
(3)
Off Isolation
(7)
Crosstalk
NC or NO Off
Capacitance
COM Off
Capacitance
CO M O n
Capacitance
Supply
Power- Supply Range
Positive Supply
Current
Negative Supply
Current
35
100
150
ns
5
8
72
85
9
9
22
pF
12
pC
dB
V+, V
I+
V+ = 5.5V, V- = 5.5V, V
IN
= 0V or V+,
All channels on or off
I
25
Full
25
Full
±2.7
80
±8
125
200
V
125
200
80
m
A
Notes:
1. The algebraic convention, where the most negative value is a minimum and the most positive is a maximum, is used in this data sheet.
2. Typical values are for DESIGN AID ONLY, not guaranteed or subject to production testing.
3. Guaranteed by design
4.
∆R
ΟΝ
= ∆R
ΟΝ
max. ∆R
ΟΝ
min.
5. Flatness is defined as the difference between the maximum and minimum value of on-resistance measured.
6. Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25ºC.
7. Off Isolation = 20log
10
[ V
COM
/ (V
NC
or V
NO
) ].
3
PS8183E
06/10/02
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PS320/PS321/PS322
Precision, Dual-Supply Analog Switches
Test Circuits/Timing Diagrams
+5V
Logic
+5V
Input
0V
50%
tr
<20ns
tf
<20ns
t
OFF
Switch
Output
V-
-5V
V
OUT
0V
t
ON
90%
90%
V
COM = 3V
COM
NO
or NC
R
L
300Ω
V
OUT
C
L
35pF
IN
Logic
Input
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE
R
L
V
OUT
= V
COM
R
L +
R
ON
(
)
LOGIC INPUT WAVEFORMS INVERTED FOR
SWITCHES THAT HAVE OPPOSITE LOGIC
Figure 2. Switching Time
+5V
+5V
V+
+3V
COM1
COM2
IN
Logic
Input
V-
-5V
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
0V
tD
tD
NO1
NC2
R
L
300
V
OUT2
C
L
35
pF
R
L
300
V
OUT1
C
L
35
pF
Logic
Input
V
OUT1
0V
V
OUT2
90%
90%
50%
90%
50%
Figure 3. Break-Before-Make Interval (PS322 only)
+5V
V+
COM
NO or
NC
C
L
IN
Logic
Input
-5V
1nF
R
GEN
V
GEN
V
OUT
V
OUT
IN
OFF
ON
ON
∆V
OUT
OFF
IN
OFF
OFF
Q = (∆V
OUT
)(C
L
)
IN POLARITY DEPENDS ON NO OR NC SWITCH FUNCTION
Figure 4. Charge Injection
4
PS8183E
06/10/02
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PS320/PS321/PS322
Precision, Dual-Supply Analog Switches
Test Circuits/Timing Diagrams (continued)
10nF
+5V
10nF
Signal
Generator 0dBm
+5V
V+
0dBm
COM
IN
COM
Analyzer
R
L
10nF
-5V
NC
or NO
V-
VIN
COM1
V+
N01
50Ω
VIN
COM
Analyzer
R
L
50
Ω
IN1
IN2
VIN
N02
COM2
NC
10nF
-5V
Figure 5. Off Isolation
+5V
Figure 6. Crosstalk
+5V
10nF
10nF
V+
COM
Capacitance
Meter
f = 1kHz
IN
NC
or NO
VIN
Capacitance
Meter
f = 1kHz
COM
V+
IN
NC
or NO
VIN
10nF
-5V
-5V
GND
Figure 7. Channel-Off Capacitance
Figure 8. Channel-On Capacitance
Packaging Mechanical: 8-Pin SOIC (W) Package
8
.149
.157
3.78
3.99
.0099
.0196
0.25
x 45˚
0.50
1
.189
.196
.016
.026
0.406
0.660
REF
4.80
5.00
1.35
1.75
SEATING PLANE
0-8˚
.0075
.0098
0.40 .016
1.27 .050
0.19
0.25
.053
.068
.2284
.2440
5.80
6.20
.050
BSC
1.27
.013 0.330
.020 0.508
.0040 0.10
.0098 0.25
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
5
PS8183E
06/10/02
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