FSA2156 — Low-Voltage SPST 0.4Ω Analog Switch
August 2007
FSA2156
—
Low-Voltage SPST 0.4Ω Analog Switch
Features
Maximum 0.7Ω On Resistance (R
ON
) for +2.7V
Supply
0.25Ω Maximum R
ON
Flatness for +2.7V Supply
Space-Saving MicroPak™ and SC70 Packaging
Broad V
CC
Operating Range: 1.65 to 4.3V
Fast Turn-on and Turn-off Times
Over-Voltage Tolerant TTL-Compatible Control Input
Suitable for 2 UL USB2.0 Applications (200mA)
Low I
CCT
Current Over Expanded Control Input Range
Description
The FSA2156 is a high-performance Single-Pole
Single-Throw (SPST) analog switch that features ultra
low R
ON
of 0.4Ω (typ.) at 2.7V V
CC
. The FSA2156
operates over the wide V
CC
range of 1.65V to 4.3V and
is fabricated with sub-micron CMOS technology to
achieve fast switching speeds. The select input is TTL-
level compatible.
FSA2156 features very low quiescent current even
when the control voltage is lower than the V
CC
supply.
This feature facilitates longer battery life in mobile
handset applications and allows for the direct interface
with baseband-processor, general-purpose I/Os.
Ordering Information
Part Number
FSA2156P6
FSA2156P6X
FSA2156L6X
Top Mark Pb-Free
2156
2156
FY
Package Description
6-lead SC70, EIAJ SC88, 1.25mm Wide
6-lead SC70, EIAJ SC88, 1.25mm Wide
6-lead MicroPak™, 1.0mm Wide
Packing Method
250 Units on Tape and Reel
3000 Units on Tape and Reel
5000 Units on Tape and Reel
Pb-free package per JEDEC J-STD-020B.
Analog Symbol
A
1
6
V
CC
V
CC 1
6
A
GND
2
5
NC
NC
2
5
B
B
3
4
Sel
Sel
3
4
GND
Figure 1.
SC70 Pin Assignments (Top View)
Figure 2.
MicroPak™ Pin Assignments (Top View)
Truth Table
Control Input (S)
L (LOW Logic Level)
H (HIGH Logic Level)
Pin Descriptions
Function
Name
A, B
Sel
Function
Switch I/O Data Ports
Control Input
Switch Open (OFF)
Switch Closed (ON)
© 2006 Fairchild Semiconductor Corporation
FSA2156 Rev. 1.0.3
www.fairchildsemi.com
FSA2156 — Low-Voltage SPST 0.4Ω Analog Switch
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device
reliability. The absolute maximum ratings are stress ratings only.
Symbol
V
CC
V
SW
V
CNTRL
I
IK
I
SW
I
SWPEAK
P
D
T
STG
T
J
T
L
ESD
Note:
1. The input and output negative ratings may be exceeded if the input and output diode current ratings are observed.
Supply Voltage
Switch I/O Voltage
(1)
(1)
Parameter
Min.
-0.5
-0.5
-0.5
± 50
Max.
4.6
V
CC
+ 0.3
4.6
± 50
500
500
180
180
Unit
V
V
V
mA
mA
mA
mW
mW
°C
°C
°C
kV
kV
kV
Control Input Voltage
Input Clamp Diode Current
Switch I/O Current (Continuous)
Pulsed at 1ms Duration, <10% Duty Cycle
Power Dissipation at 85ºC
Storage Temperature Range
Maximum Junction Temperature
Lead Temperature (Soldering, 10 seconds)
All Pins
Human Body Model
I/O to GND
Charge Discharge Model
SC70 Package
MicroPak™ Package
-65
+150
+150
+260
2
8
2
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
V
CC
V
CNTRL
V
SW
I
SW
T
A
θ
JA
Note:
2. Control input must be held HIGH or LOW; it must not float.
Supply Voltage
Control Input Voltage
Switch I/O Voltage
Switch I/O Load Current
Operating Temperature
Thermal Resistance (free air)
SC70 6L package
MicroPak™ 6L package
-40
(2)
Parameter
Min.
1.65
0
0
Max.
4.3
V
CC
V
CC
350
85
350
310
Unit
V
V
V
mA
ºC
°C/W
°C/W
© 2006 Fairchild Semiconductor Corporation
FSA2156 Rev. 1.0.3
www.fairchildsemi.com
2
FSA2156 — Low-Voltage SPST 0.4Ω Analog Switch
DC Electrical Characteristics
All typical values are at 25°C unless otherwise specified.
Symbol
Parameter
Conditions
V
CC
(V)
Min.
3.6 - 4.3
V
IH
Input Voltage High
2.7 - 3.6
2.3 - 2.7
1.65 - 1.95
3.6 - 4.3
V
IL
Input Voltage Low
2.7 - 3.6
2.3 - 2.7
1.65 - 1.95
I
IN
I
NO(0FF)
Control Input
Leakage
Off Leakage Current
of Port B
On Leakage Current
of Port A
Power Off Leakage
Current
Power Off Leakage
Current
(3)
V
CNTRL
= 0 to V
CC
V
A
= 0.3V, V
CC
– 0.3V, V
B
=
0.3V, V
CC
– 0.3V or Floating
Figure 4
V
A
= 0.3V, V
CC
– 0.3V,
V
B
= Floating
Figure 5
Port A V
A
= 0.3V, 4.3V, V
CC
=
0V, V
B
= 0V
Port A V
A
= 0.3V, 4.3V, V
CC
=
0V, V
B
= Floating
I
ON
= 100mA, V
B
= 0V, 0.7V,
3.6V and 4.3V
R
ON
Switch On
Resistance
(4)
Figure 3
I
ON
= 100mA, V
B
= 0V, 0.7V,
2.0V and 2.7V
I
ON
= 100mA, V
B
= 0V, 0.7V,
1.6V and 2.3V
I
ON
= 100mA, V
B
= 0.7V
I
ON
= 100mA, V
B
= 0V, 0.7V,
3.6V and 4.3V
On Resistance
Flatness
(5)
Figure 3
I
ON
= 100mA, V
B
= 0V, 0.7V,
2.0V and 2.7V
I
ON
= 100mA, B = 0V, 0.7V,
1.6V and 2.3V
I
ON
= 100mA, V
B
= 0V, 0.7V,
0.9V and 1.65V
I
CC
I
CCT
Quiescent Supply
Current
Increase in Icc per
Input
V
SW
= 0 or V
CC
, I
OUT
= 0
V
CNTRL
= 2.6V
V
CNTRL
= 1.8V
1.65 - 4.3
1.95 - 4.3
-10
10
-0.5
-50
T
A
= +25ºC
Typ.
Max.
T
A
= -40 to
+85ºC
Min.
1.4
1.3
1.1
0.9
0.7
0.5
0.4
0.4
0.5
50
Units
Max.
V
V
V
µA
nA
I
A(ON)
1.95 - 4.3
0V
0V
4.3
2.7
2.3
1.65
4.3
2.7
2.3
1.65
4.3
4.3
-20
20
-100
100
±25
nA
µA
nA
I
0FF
-4
0.36
0.4
0.55
1.5
+4
-35
35
0.60
0.7
0.80
Ω
0.25
0.25
Ω
0.3
0.9
-100
30
3
7
12
100
-500
500
6.0
15.0
nA
µA
R
FLAT(ON)
Notes:
3. Guaranteed by characterization; not production tested.
4. On resistance is determined by the voltage drop between A and B pins at the indicated current through the switch.
5. Flatness is defined as the difference between the maximum and minimum value of on resistance over the
specified range of conditions.
© 2006 Fairchild Semiconductor Corporation
FSA2156 Rev. 1.0.3
www.fairchildsemi.com
3
FSA2156 — Low-Voltage SPST 0.4Ω Analog Switch
AC Electrical Characteristics
All typical values are at 25°C unless otherwise specified.
Symbol
Parameter
Conditions
V
CC
(V)
3.6 - 4.3
t
ON
V
B
= 1.5V,
Turn-On Time R
L
= 50Ω, C
L
=
35pF
2.7 - 3.6
2.3 - 2.7
1.65 - 1.95
3.6 - 4.3
t
OFF
V
B
= 1.5V,
Turn-Off Time R
L
= 50Ω, C
L
=
35pF
Charge
Injection
Off Isolation
-3db
Bandwidth
Total
Harmonic
Distortion
C
L
= 1.0nF, V
S
=
0V ,
R
S
= 0Ω
f = 100kHz
R
T
= 50Ω
R
T
= 50Ω
C
L
= 0pF
R
T
= 600Ω, V
SW
=
0.5V
PP
,
f = 20Hz to 20kHz
2.7 - 3.6
2.3 - 2.7
1.65 - 1.95
Q
OIRR
BW
THD
2.3 - 4.3
1.65 - 1.95
1.65 - 4.3
1.65 - 4.3
1.65 - 4.3
90
6
1.3
-65
80
.02
pC
dB
MHz
%
Figure 10
Figure 9
Figure 8
40
65
70
75
70
75
80
ns
Figure 6
Figure 7
T
A
= +25ºC
Min. Typ.
Max.
55
60
65
T
A
= -40ºC
to +85ºC
Min.
Max.
60
65
70
ns
Figure 6
Figure 7
Units
Figure
Capacitance
Symbol
C
IN
C
OFF
C
ON
Parameter
Control Pin Input
Capacitance
B-Port Off
Capacitance
A-Port On
Capacitance
Conditions
f = 1MHz
f = 1MHz
f = 1MHz
V
CC
(V)
0
4.3
4.3
T
A
= +25ºC
Min.
Typ.
1.5
38
115
Max.
Units
pF
pF
pF
Figures
Figure 11
Figure 11
Figure 12
© 2006 Fairchild Semiconductor Corporation
FSA2156 Rev. 1.0.3
www.fairchildsemi.com
4
FSA2156 — Low-Voltage SPST 0.4Ω Analog Switch
Test Diagrams
VON
Floating, 0.3V
or Vcc-0.3V
A
I
ON
VCNTRL
R
ON
= V
ON
/ I
ON
GND
B
FSA2156
A
I
A(OFF)
A
VSW
VCNTRL
GND
B
VSW
GND
FSA2156
Figure 3.
On Resistance
Figure 4.
Off Leakage
FSA2156
B
Floating
B
FSA2156
A
I
A(ON)
A
VSW
VCNTRL
GND
V
SW
GND
R
S
A
C
L
GND
R
L
V
OUT
V
CNTRL
GND
R
L
and C
L
are functions of the application
environment (see AC/DC tables for values).
C
L
includes test fixture and stray capacitance.
Figure 5.
On Leakage
Figure 6.
Test Circuit Load
Figure 7.
Turn-On / Turn-Off Waveforms
© 2006 Fairchild Semiconductor Corporation
FSA2156 Rev. 1.0.3
www.fairchildsemi.com
5
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