Revised April 2005
FSA1256 • FSA1256A • FSA1257 • FSA1257A •
FSA1258 • FSA1258A
Low RON Low Voltage Dual SPST Analog Switch
with Low ICCT “A” Option
General Description
Features
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: maximum at 4.5V VCC. The
FSA1256, FSA1257, and FSA1258 operate over a wide
VCC range of 1.65V to 5.5V. The FSA1256A, FSA1257A,
and FSA1258A operation range is 2.7V to 5.5V. 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 switch.
■ FSA1256A, FSA1257A, FSA1258A feature low ICCT
when S Input is lower than VCC
■ Maximum 1.1: On Resistance (RON) for 4.5V supply
■ 0.4: max RON flatness for 4.5V supply
■ Space saving Pb-Free MicroPak¥ packaging
■ Broad VCC operating range:
• FSA1256, FSA1257, FSA1258:
1.65V to 5.5V
• FSA1256A, FSA1257A, FSA1258A: 2.7V to 5.5V
■ Fast turn-on and turn-off time
■ FSA1258, FSA1258A feature break-before-make enable
circuitry
■ Over-voltage tolerant TTL compatible control input
Ordering Code:
Product
Order
Package
Code
Number
Number
Top Mark
Package Description
Supplied As
FSA1256L8X
MAC08A
EB
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
5K Units on Tape and Reel
FSA1256AL8X
MAC08A
FN
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
5K Units on Tape and Reel
FSA1257L8X
MAC08A
EC
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
5K Units on Tape and Reel
FSA1257AL8X
MAC08A
FP
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
5K Units on Tape and Reel
FSA1258L8X
MAC08A
ED
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
5K Units on Tape and Reel
FSA1258AL8X
MAC08A
FS
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
5K Units on Tape and Reel
Pb-Free package per JEDEC J-STD-020B.
MicroPak¥ is a trademark of Fairchild Semiconductor Corporation.
© 2005 Fairchild Semiconductor Corporation
DS500883
www.fairchildsemi.com
FSA1256 • FSA1256A • FSA1257 • FSA1257A • FSA1258 • FSA1258A Low RON Low Voltage Dual SPST Analog
Switch with Low ICCT “A” Option
March 2004
FSA1256 • FSA1256A • FSA1257 • FSA1257A • FSA1258 • FSA1258A
Analog Symbols
FSA1256, FSA1256A
FSA1257, FSA1257A
(Top Through View)
(Top Through View)
Truth Tables
FSA1256, FSA1256A
H
FSA1257, FSA1257A
Control Input(s)
Function
Control Input(s)
Function
L
Disconnect
L
A Connected to B
H
A Connected to B
H
Disconnect
HIGH Logic Level
L
LOW Logic Level
Analog Symbol
FSA1258, FSA1258A
(Top Through View)
Truth Table
FSA1258, FSA1258A
Control Input 1S
Function
Control Input 2S
Function
L
1A Connected to 1B
L
Disconnect
H
Disconnect
H
2A Connected to 2B
H
HIGH Logic Level
L
LOW Logic Level
Pin Descriptions
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Pin Names
Function
A, B
Data Ports
S
Control Input
2
Recommended Operating
Conditions
0.5V to 6.0V
0.5V to VCC 0.5V
0.5V to 6.0V
50 mA
Supply Voltage (VCC)
Switch Voltage (VS) (Note 2)
Input Voltage (VIN) (Note 2)
Input Diode Current
Switch Current
Supply Voltage (VCC)
FSA1256, FSA1257, FSA1258
200 mA
Peak Switch Current (Pulsed at
1 ms duration, 10% Duty Cycle)
1.65V to 5.5V
FSA1256A, FSA1257A, FSA1258A
400 mA
2.7V to 5.5V
Control Input Voltage (VIN) (Note 3)
0V to VCC
Switch Input Voltage (VIN)
0V to VCC
40qC to 85qC
Operating Temperature (TA)
Power Dissipation @ 85qC
Thermal Resistance (TJA) in still air
MicroPak 8L package
180 mW
Storage Temperature Range (TSTG)
Maximum Junction Temperature (TJ)
(modeled)
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Lead Temperature (TL)
260qC
Soldering, 10 seconds
ESD
Human Body Model
FSA1256, FSA1257, FSA1258
5.5kV
FSA1256A, FSA1257A, FSA1258A
4.5kV
224qC/W
MicroPak 8L package
65qC to 150qC
150qC
Note 2: The input and output negative voltage ratings may be exceeded if
the input and output diode current ratings are observed.
Note 3: Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics (All typical values are @ 25qC unless otherwise specified)
Symbol
VIH
VIL
Parameter
Input Voltage High
Input Voltage Low
VCC
(V)
TA
Min
25qC
Typ
TA 40qC to 85qC
Max
Min
2.7 to 3.6
2.0
4.5 to 5.5
2.4
INO(OFF),
Control Input Leakage
OFF-Leakage Current
INC(OFF)
0.4
2.7 to 3.6
0.6
RON
'RON
Conditions
FSA1256A, FSA1257A, FSA1258A Only
V
0.8
2.7 to 3.6
1.0
1.0
4.5 to 5.5
1.0
1.0
20.0
20.0
5.5
Units
V
2.7 to 3.6
4.5 to 5.5
IIN
Max
-2.0
2.0
Switch On Resistance
2.7
2.6
4.0
4.3
(Note 4)
4.5
0.95
1.15
1.3
4.5
0.06
0.12
0.15
PA
nA
:
0V to VCC
VIN
A
1V, 4.5V
1B or 2B
1V, 4.5V
IOUT
100 mA, 1B or 2B
1.5V
IOUT
100 mA, 1B or 2B
3.5V
IOUT
100 mA, 1B or 2B
3.5V
IOUT
100 mA, 1B or 2B
0V, 0.75V, 1.5V
IOUT
100 mA, 1B or 2B
0V, 1V, 2V
On Resistance Matching
Between Channels
:
(Note 5)
RFLAT(ON) On Resistance Flatness
2.7
1.4
(Note 6)
4.5
0.2
0.3
0.4
ICC
Quiescent Supply Current
3.6
0.1
0.5
1.0
5.5
0.1
0.5
ICCT
Increase in ICC per Input
4.3
0.2
1.0
10.0
:
PA
VIN
PA
One Input at 2.6V, Others at VCC or GND
0V or VCC, IOUT
0V
(FSA1256A, FSA1257A, FSA1258A Only)
Note 4: On Resistance is determined by the voltage drop between A and B pins at the indicated current through the switch.
Note 5: 'RON
RONmax RONmin measured at identical VCC, temperature, and voltage.
Note 6: Flatness is defined as the difference between the maximum and minimum value of On Resistance over the specified range of conditions.
3
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FSA1256 • FSA1256A • FSA1257 • FSA1257A • FSA1258 • FSA1258A
Absolute Maximum Ratings(Note 1)
FSA1256 • FSA1256A • FSA1257 • FSA1257A • FSA1258 • FSA1258A
AC Electrical Characteristics (All typical value are @ 25qC unless otherwise specified)
Symbol
tON
tOFF
tB-M
Q
OIRR
Xtalk
BW
THD
VCC
Parameter
TA
TA 40qC to 85qC
Max
2.7 to 3.6
15.0
50.0
60.0
4.5 to 5.5
10.0
35.0
40.0
2.7 to 3.6
8.0
20.0
30.0
4.5 to 5.5
4.0
15.0
20.0
Break-Before-Make
2.7 to 3.6
12.0
Time
4.5 to 5.5
7.0
Turn OFF Time
Charge Injection
OFF-Isolation
Min
25qC
Typ
Turn ON Time
(V)
2.7 to 3.6
10.0
4.5 to 5.5
20.0
2.7 to 3.6
70.0
4.5 to 5.5
70.0
2.7 to 3.6
100
4.5 to 5.5
100
2.7 to 3.6
300
4.5 to 5.5
300
Total Harmonic
2.7 to 3.6
0.002
Distortion
4.5 to 5.5
0.002
Crosstalk
3db Bandwidth
Min
Units
Max
ns
ns
ns
pC
Figure
Conditions
Number
1B or 2B
1.5V, RL
50:, CL
35 pF
1B or 2B
3.0V, RL
50:, CL
35 pF
1B or 2B
1.5V, RL
50:, CL
35 pF
1B or 2B
3.0V, RL
50:, CL
35 pF
1B or 2B
1.5V, RL
50:, CL
35 pF
1B or 2B
3.0V, RL
50:, CL
35 pF
CL
1.0 nF, VGEN
RGEN
0V,
Figure 1
Figure 1
Figure 2
Figure 4
0:
dB
f
1MHz, RL
50:
Figure 3
dB
f
1MHz, RL
50:
Figure 6
MHz
%
50:
RL
600:, VIN
RL
f
Figure 7
0.5V P.P,
Figure 8
20Hz to 20kHz
Capacitance
Symbol
Parameter
TA
VCC
(V)
Min
25qC
Typ
TA
Max
40qC to 85qC
Min
Units
Conditions
Max
CIN
Control Pin Input Capacitance
0.0
3.0
pF
f
1MHz (see Figure 6)
COFF
B Port OFF Capacitance
4.5
11.5
pF
f
1MHz (see Figure 6)
CON
A Port ON Capacitance
4.5
27.0
pF
f
1MHz (see Figure 6)
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4
Logic Input Waveforms Inverted
for Switches that have the Opposite Logic Sense
CL includes Fixture and Stray Capacitance
FIGURE 1. Turn-On/Turn-Off Timing
FIGURE 2. Break-Before-Make Timing
FIGURE 3. OFF Isolation
5
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FSA1256 • FSA1256A • FSA1257 • FSA1257A • FSA1258 • FSA1258A
AC Loading and Waveforms
FSA1256 • FSA1256A • FSA1257 • FSA1257A • FSA1258 • FSA1258A
AC Loading and Waveforms
(Continued)
Q
('VOUT )(CL)
FIGURE 4. Charge Injection
FIGURE 5. Crosstalk
FIGURE 6. ON/OFF Capacitance Measurement Setup
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6
FSA1256 • FSA1256A • FSA1257 • FSA1257A • FSA1258 • FSA1258A
AC Loading and Waveforms
(Continued)
FIGURE 7. Bandwidth
FIGURE 8. Harmonic Distortion
7
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FSA1256 • FSA1256A • FSA1257 • FSA1257A • FSA1258 • FSA1258A
Tape and Reel Specification
Tape Format For Micropak
Package
Tape
Number
Cavity
Section
Cavities
Status
Status
Leader (Start End)
125 (typ)
Empty
Sealed
Designator
L8X
Cover Tape
Carrier
5000
Filled
Sealed
Trailer (Hub End)
75 (typ)
Empty
Sealed
REEL DIMENSIONS inches (millimeters)
Tape
Size
8 mm
A
B
C
D
N
W1
W2
W3
7.0
0.059
0.512
0.795
2.165
0.331 0.059/0.000
0.567
W1 0.078/0.039
(177.8)
(1.50)
(13.00)
(20.20)
(55.00)
(8.40 1.50/0.00)
(14.40)
(W1 2.00/1.00)
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8
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
Package Number MAC08A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
device or system whose failure to perform can be reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the
user.
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9
www.fairchildsemi.com
FSA1256 • FSA1256A • FSA1257 • FSA1257A • FSA1258 • FSA1258A Low RON Low Voltage Dual SPST Analog
Switch with Low ICCT “A” Option
Physical Dimensions inches (millimeters) unless otherwise noted