To learn more about ON Semiconductor, please visit our website at
www.onsemi.com
Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers
will need to change in order to meet ON Semiconductor’s system requirements. Since the ON Semiconductor
product management systems do not have the ability to manage part nomenclature that utilizes an underscore
(_), the underscore (_) in the Fairchild part numbers will be changed to a dash (-). This document may contain
device numbers with an underscore (_). Please check the ON Semiconductor website to verify the updated
device numbers. The most current and up-to-date ordering information can be found at www.onsemi.com. Please
email any questions regarding the system integration to Fairchild_questions@onsemi.com.
Is Now Part of
ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number
of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right
to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON
Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON
Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s
technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA
Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended
or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out
of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor
is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
November 2013
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA1256(A) / FSA1257(A) / FSA1258(A) Rev. 1.0.9
FSA1256(A) / FSA1257(A) / FSA1258(A) — Low-RON Low-Voltage, Dual SPST Analog Switch with Low-ICCT “A” Option
FSA1256(A) / FSA1257(A) / FSA1258(A)
Low-RON Low-Voltage, Dual SPST Analog Switch
with Low-ICCT “A” Optio n
Features
FSA1256A, FSA1257A, FSA1258A Feature Low
ICCT when S Input is Lower than VCC
Maximu m 1.1 Ω On Resistance (RON) for
4.5 V Supply
0.4 Ω Max. RON Flatness for 4. 5 V Supply
Space-Saving Pb-Free MicroPak™ Packaging
Broad VCC Operating Range:
- FSA1256, FSA1257, FSA1258: 1.65 V to 5.5 V
- FSA1256A, FSA1257A, FSA1258A: 2.7 V to
5.5 V
Fast Turn-On and Turn-Off Times
FSA1258, FSA1258A Feature Break-Before-Make
Enable Circuitry
Over-Voltage Tolerant TTL-Compatible Control Input
Applications
Cell Phone, PDA, Digital Camera, and Notebook
LCD Monitor, TV, and Set-Top Box
Description
The FSA1256, FSA1256A, FSA1257, FSA1257A,
FSA1258, and FSA1258A are high performance dual
Single-Pole / Single-Throw (SPST) analog switches. All
devices feature ultra-low RON of 1.1 Ω maximum at 4.5 V
VCC. The FSA1256, FSA1257, and FSA1258 operate
over a wide VCC range of 1.65 V to 5.5 V. The
FSA1256A, FSA1257A, and FSA1258A operation range
is 2.7 V to 5.5 V. These devices are fabricated with sub-
micron CMOS technology to achieve fast switching
speeds and are designed for break-before-make
operation. The select input is TTL level compatible. The
FSA1256 and FSA1256A feature two Normally Open
(NO) switches. The FSA1257 and FSA1257A feature
two Normally Closed (NC) switches. The FSA1258 and
FSA1258A have one NO switch and one NC swi tch.
IMPORTANT NOT E:
For additional performance information, please contact
analogswitch@fairchildsemi.com.
Ordering Information
Part Number Top Mark Package Des cript ion Packing Method
FSA1256L8X EB 8-Lead, MicroPak™, 1.6 mm Wide 5000 Units Tape and Reel
FSA1256AL8X FN 8-Lead, MicroPak, 1.6 mm Wide 5000 Units Tape and Reel
FSA1257L8X EC 8-Lead, MicroPak, 1.6 mm Wide 5000 Units Tape and Reel
FSA1257AL8X FP 8-Lead, MicroPak, 1.6 mm Wide 5000 Units Tape and Reel
FSA1258L8X ED 8-Lead, MicroPak, 1.6 mm Wide 5000 Units Tape and Reel
FSA1258AL8X FS 8-Lead, MicroPak, 1.6 mm Wide 5000 Units Tape and Reel
MicroPak ™ is a trademark of Fairchild Semic onduct or Corporation.
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA1256(A) / FSA1257(A) / FSA1258(A) Rev. 1.0.9 2
FSA1256(A) / FSA1257(A) / FSA1258(A) — Low-RON Low-Voltage, Dual SPST Analog Switch with Low-ICCT
Analog Symbols
Figure 1. FSA1256, FSA1256A
Figure 2. FSA1257, FSA1257A
Truth Tables
Control Inp u t (s) Function Control Inp u t (s) Function
LO W Logic Level Disconnect LO W Logic Level A Connected to B
HIGH Logic Level A Connected to B HIGH Logic Level Disconnected
4
3
2
1
5
6
7
81A
Vcc
1S
2B
2A
1B
2S
GND
Figure 3. FSA1258, FSA1258A
Truth Table
Control Inp u t, 1S Function Control Input 2S Function
LOW Logic Level 1A Connected to 1B LOW Logic Level Disconnect
HIGH Logic Level Disconnect HIGH Logic Level 2A Connected to 2B
Pin Descriptions
Name Description
A, B0, B1 Data Ports
S Switch Select Pin
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA1256(A) / FSA1257(A) / FSA1258(A) Rev. 1.0.9 3
FSA1256(A) / FSA1257(A) / FSA1258(A) — Low-RON Low-Voltage, Dual SPST Analog Switch with Low-ICCT
Absolute Ma ximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the rec ommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating c onditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol Parameter Min. Max. Units
VCC Supply Voltage -0.5 6.0 V
VS Switch Voltage(1) -0.5 VCC +0.5 V
Vin Input Voltage(1) -0.5 6.0 V
Power Dis sipation at 85°C, MicroPak 8-Lead Package 180 mW
IIK Input Diode Current -50 mA
ISW Switch Current 200 mA
ISWPEAK Peak Switch Current (Pulsed at 1ms Duration, <10% Duty Cycle) 400 mA
TSTG Storage Temperature Range -65 +150 °C
TJ Maximum Junction Temperature +150 °C
TL Lead Temperature (So lder ing 10 Seconds) +260 °C
ESD Human Body Model
(JEDEC: JESD22-A114) FSA1256, FSA1257, FSA1258 5.5 kV
FSA1256A, FSA1257A, FSA1258A 4.5
Note:
1. Input and output negative ratings may be exceeded if input and output diode current ratings are observed.
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. Fai rchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol Parameter Min. Max. Units
VCC Supply Voltage FSA1256, FSA1257, FSA1258 1.65 5.50 V
FSA1256A, FSA1257A, FSA1258A 2.70 5.50
VIN Control Input Voltage (2) 0 VCC V
VIN Switch Input Voltage 0 VCC V
ΘJA Thermal Resistan ce in Still Air, MicroPak 8L Package (Modeled) 224 °C/W
TA Operating Temperature -40 +85 ºC
Note:
2. Unused inputs must be held HIGH or LOW. They must not float.
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA1256(A) / FSA1257(A) / FSA1258(A) Rev. 1.0.9 4
FSA1256(A) / FSA1257(A) / FSA1258(A) — Low-RON Low-Voltage, Dual SPST Analog Switch with Low-ICCT
DC Electrical Characteristics
All typical values are at 25ºC unless otherwise specified. The 1.65 V to 1.95 V range applies to FSA1256, FSA1257,
and FSA1258 only.
Symbol Parameter Conditions VCC (V) TA=+25°C TA=-40 to
+85°C Unit
Min. Typ. Max. Min. Max.
VIH Input Voltage High(3) 4.5 to 5.5 2.4 V
2.7 to 3.6 2.0
1.65 to 1.95
0.9
VIL Input Vol tage Low(3)
4.5 to 5.5 0.8
V
FSA1256A, FSA1257A,
FSA1258A Only 2.7 to 3.6 0.4
FSA1256, FSA1257,
FSA1258 Only 2.7 to 3.6 0.6
1.65 to 1.95 0.4
IIN Control Inpu t Leaka ge
(S) VIN=0 to VCC 1.95 to 5.5 -1 1 µA
INO(0FF) ,
INC(0FF) Off Leakage Current A=1 V, 4.5 V
1B or 2B=1 V, 4.5 V 5.5 ±2 -20 20 nA
RON Switch On
Resistance(3,4)
IOUT=100 mA, 1B or
2B=3.5 V 4.5 0.95 1.15 1.30
Ω
IOUT=100 mA, 1B or
2B=1.5 V 2.7 2.6 4.0 4.3
IOUT=100 mA, 1B or
2B=1.2 V 1.65 8.0 9.5 10.5
∆RON On Resis tance
Matching Between
Channels(3,5)
IOUT=100 mA, 1B or
2B=3.5 V 4.5 0.06 0.12 0.15 Ω
RFLAT(ON) On Resistance
Flatness(3,6)
IOUT=100 mA, 1B or
2B=0 V, 1.0 V, 2.0 V 4.5 0.2 0.3 0.4
Ω
IOUT=100 mA, 1B or
2B=0 V, 0.75 V, 1.5 V 2.7 1.4
IOUT=100 mA, 1B or
2B=0 V, 1.0 V, 1.2 V 1.65 1.8
ICC Quiescent Supply
Current VIN=0 V or VCC, IOUT=0 V 5.5 0.1 0.5 1.0 µA
3.6 0.1 0.5 1.0
ICCT Increase in ICC per Input
One Input at 2.6 V,
Others at VCC or GND
(FSA1256A, FSA1257A,
FSA1258A Only)
4.3 0.2 10.0 µA
Notes:
3. Guaranteed, but not tested for VCC=1.65 V.
4. On resistance is deter min ed by the v oltage drop bet w een A and B pins at the indicated current through the switch.
5. ∆ RON=RON max – RON min measured at identical VCC, temperature, and voltage.
6. Flatness is defined as the difference between the maximum and minimum value of on resistance (RON) over the
specified range of cond itions.
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA1256(A) / FSA1257(A) / FSA1258(A) Rev. 1.0.9 5
FSA1256(A) / FSA1257(A) / FSA1258(A) — Low-RON Low-Voltage, Dual SPST Analog Switch with Low-ICCT
AC Electrical Characteristics
All typical values are at 25ºC unless otherwise specified. The 1.65 V to 1.95 V range applies to FSA1256, FSA1257,
and FSA1258 only.
Symbol Parameter Conditions VCC (V) TA=+25ºC TA=-40 to
+85°C Unit Figure
Min. Typ. Max. Min. Max.
tON Turn-On Time(7)
1B or 2B=3.0 V,
RL=50 Ω, CL=35 pF 4.5 to 5.5 10 35 40
ns Figure 8
1B or 2B=1.5 V,
RL=50 Ω, CL=35 pF 2.7 to 3.6 15 50 60
1B or 2B=1.0 V
RL=50 Ω, CL=35 pF 1.65 to 1.95 35 110 120
tOFF Turn-Off Time(7)
1B or 2B=3.0 V,
RL=50 Ω, CL=35 pF 4.5 to 5.5 4 15 20
ns Figure 8
1B or 2B=1.5 V,
RL=50 Ω, CL=35 pF 2.7 to 3.6 8 20 30
1B or 2B=1.0 V
RL=50 Ω, CL=35 pF 1.65 to 1.95 10 30 40
tBBM Break-Before-
Make Time(7)
1B or 2B=3.0 V,
RL=50 Ω, CL=35 pF 4.5 to 5.5 7 ns Figure 9
1B or 2B=1.5 V,
RL=50 Ω, CL=35 pF 2.7 to 3.6 12
Q Charge
Injection(7)
CL=1.0 nF,
VGEN=0 V,
RGEN=0 Ω
4.5 to 5.5 20 pC Figure 13
2.7 to 3.6 10
1.65 to 1.95 5
OIRR Off Isolation(7) f=1 MHz, RL=50 Ω, 1.65 to 5.50 -70 dB Figure 11
Xtalk Crosstalk(7) f=1 MHz, RL=50 Ω, 1.65 to 4.30 -100 dB Figure 12
BW -3db
Bandwidth(7) RL=50 Ω 1.65 to 4.30 300 MHz Figure 10
THD Total Harmonic
Distortion(7)
f=20 Hz to 20 kHz,
RL=600 Ω,
VIN=0.5 VPP 1.65 to 4.30 0.002 % Figure 16
Notes:
7. Guaranteed, but not tested for VCC=1.65 V.
Capacitance
Symbol Parameter Conditions VCC (V) TA=+25ºC Unit Figure
Min. Typ. Max.
CIN Control Pin Input Capacitance f=1 MHz 0 3.0 pF Figure 15
COFF B Port Off Capacitanc e f=1 MHz 4.5 11.5 pF Figure 14
CON A Port On Capacitance f=1 MHz 4.5 27.0 pF Figure 15
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA1256(A) / FSA1257(A) / FSA1258(A) Rev. 1.0.9 6
FSA1256(A) / FSA1257(A) / FSA1258(A) — Low-RON Low-Voltage, Dual SPST Analog Switch with Low-ICCT
Test Diagrams
Select
B0,B1
A
VS = 0 or VCC
ION
V
ON
RON=VON / ION
GND
V
SW
GND
V
Select
= 0 orVcc
NC A
I
A(OFF)
V
IN
GND
I
V
IN
V
IN
VS
Figure 4. On Resistance Figure 5. Off Leakage (Ports Tested Separately)
Select
V
S
=0 orVcc
NC
I
A(ON)
V
IN
GND
A
V
IN
V
R
L
C
L
nB
n
nA
GND
GND
R
S
V
Sel
V
IN
GND
VOUT
Figure 6. On Leakage Figure 7. Test Circuit Load
tRISE
= 2.5ns
GND
VCC 90%90%
10%10%
tFALL
= 2.5ns
VCC /2 VCC/2
Input - V
Sel
Output- V
OUT
90%
VOH
VOL tON tOFF
90%
tFALL
-
-
-
Figure 8. Turn-On / Turn-Off Waveforms
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA1256(A) / FSA1257(A) / FSA1258(A) Rev. 1.0.9 7
FSA1256(A) / FSA1257(A) / FSA1258(A) — Low-RON Low-Voltage, Dual SPST Analog Switch with Low-ICCT
Test Diagrams (Continued)
VCC
VCC/2
t
D
0V
V
OUT
Input
-
V
Sel
0.9*VOUT
t
RISE
=2.5ns
90%
10%
C
L
B0 B1
n
R
L
nA
GND
GND
R
S
V
Sel
V
SW
GND
V
OUT
V
IN
GND
V
--
V
Sel
R
L
and C
L
are functions of the application
environment (50, 75, or 100 ).
C
L
includes test fixture and stray capacitance.
0.9*VOUT
Figure 9. Break-Before-Make Interv al Ti ming
V
OUT
GND
GND
R
T
GND
GND
V
S
R
S
Network Analyzer
V
S
GND
R
S
and R
T
are functions of the application
environment (50, 75, or 100 ).
V
IN
Figure 10. Bandwidth
V
OUT
GND
GND
R
T
GND
GND
V
S
R
S
Network Analyzer
R
T
GND
V
Sel
GND
Off Isolation= 20 Log (V
OUT
/ V
IN
)
T
RS and RT are functions of the application
environment (50, 75, or 100 ).
Figure 11. Channel Off Isolation
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA1256(A) / FSA1257(A) / FSA1258(A) Rev. 1.0.9 8
FSA1256(A) / FSA1257(A) / FSA1258(A) — Low-RON Low-Voltage, Dual SPST Analog Switch with Low-ICCT
Test Diagrams (Continued)
R
S
and R
T
are functions of the application
environment (50, 75, or 100 ).
VOUT
GND
GNDRT
GND
GND
VS
RS
Network Analyzer
RT
GND
VSel
GND
Crosstalk = 20 Log (V
OUT
/ V
IN
)
VIN
Figure 12. Adjacent Channel Crosstalk
R
S
V
OUT
Q = ∆V
OUT
• CL
∆V
OUT
V
OUT
V
CC
0V
Input – V
SEL
Generator
GND
V
S
C
L
VSEL
V
IN
B
nS
n
GND C
L
includes test fixture and stray capacitance
GND
Off On Off
mA
Figure 13. Charge Injection Test
B0nB1
Capacitance
Meter
Select
B0,B1
f=1MHz
V
S
= 0 or V
CC
nBn
Capacitance
Meter
Select
f=1MHz V
S
= 0 or V
CC
nBn
Figure 14. Channel Off Capacitance Figure 15. Channel On Capacitance
VOUT
GND
GND RT
GND
GND
VS
RS
Audio Analyzer
VCNTRL
GND
VIN
VCNTRL = 0 or Vcc
RS and RT are functions of the
application environment.
Figure 16. Total Harmonic Distortion
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA1256(A) / FSA1257(A) / FSA1258(A) Rev. 1.0.9 9
FSA1256(A) / FSA1257(A) / FSA1258(A) — Low-RON Low-Voltage, Dual SPST Analog Switch with Low-ICCT
Physical Dimensions
(0.09)
(0.1)
(0.2)
1.6
2X
0.05
0.00
1.6
2X
C0.05 C
4
3. DRAWING CONFORMS TO ASME Y.14M-1 994
2. DIMENSIONS ARE IN MILLIMETERS
1. PACKAGE CONFO R MS TO JEDEC MO-255 VARIATION UAAD
BOTTOM VIEW
4. PIN 1 FLAG, END OF PACKAGE OFFSET
MAC08AREV4
12 3
567
8
Notes:
8X 0.25
0.35
3X
8X 1.0
4
0.5
8X
0.25
0.15 0.10 C A B
0.05 C
0.10 C
TOP VIEW
INDEX AREA
B
Recommended Landpattern
A
0.10 C
0.55 MAX
0.05 C
DETAIL A 0.35
0.25
(0.15)
(0.20)
0.35
0.25
DETAIL A
PIN #1 TERMINAL
SCALE: 2X
5. DRAWING FILE NAME: MKT-MAC08AREV4
Figure 17. 8-Lead MicroPak™ , 1.6 mm Wide
For tape and reel specifications for MicroPak, please visit:
http://www.fairchildsemi.com/products/logic/pdf/micropak_tr.pdf
Package drawings are provided as a service to customers consideri ng Fairc hild components . Draw i ngs may change in any manner
without notic e. Pleas e note the revision and/or date on the drawing and contact a Fairchild Semiconductor represent ative to verify or
obtain the most recent revision. Package specific ati ons do not expand the terms of Fairchil d’s wor l dwide terms and conditions,
specifically the warranty therein, which covers Fairchild products.
Always visit Fairchil d Semic onductor ’s online pack agi ng area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA1256(A) / FSA1257(A) / FSA1258(A) Rev. 1.0.9 10
FSA1256(A) / FSA1257(A) / FSA1258(A) — Low-RON Low-Voltage, Dual SPST Analog Switch with Low-ICCT
www.onsemi.com
1
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent
coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such
claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This
literature is subject to all applicable copyright laws and is not for resale in any manner.
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