FSA1256 • FSA1256A • FSA1257 • FSA1257A • FSA1258 • FSA1258A Low RON Low Voltage Dual SPST Analog
Switch with Low ICCT “A” Option
March 2004
Revised April 2005
FSA1256 • FSA1256A • FSA1257 • FSA1257A •
FSA1258 • FSA1258A
Low R
ON
Low Voltage Dual SPST Analog Switch
with Low I
CCT
“A” Option
General Description
The FSA1256, FSA1256A, FSA1257, FSA1257A,
FSA1258, and FSA1258A are high performance dual Sin-
gle Pole/Single Throw (SPST) analog switches. All devices
feature ultra low R
ON
of 1.1
:
maximum at 4.5V V
CC
. The
FSA1256, FSA1257, and FSA1258 operate over a wide
V
CC
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 Nor-
mally 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.
Features
s
FSA1256A, FSA1257A, FSA1258A feature low I
CCT
when S Input is lower than V
CC
s
Maximum 1.1
:
On Resistance (R
ON
) for 4.5V supply
s
0.4
:
max R
ON
flatness for 4.5V supply
s
Space saving Pb-Free MicroPak
¥
packaging
s
Broad V
CC
operating range:
• FSA1256, FSA1257, FSA1258:
1.65V to 5.5V
• FSA1256A, FSA1257A, FSA1258A: 2.7V to 5.5V
s
Fast turn-on and turn-off time
s
FSA1258, FSA1258A feature break-before-make enable
circuitry
s
Over-voltage tolerant TTL compatible control input
Ordering Code:
Product
Order
Number
FSA1256L8X
FSA1256AL8X
FSA1257L8X
FSA1257AL8X
FSA1258L8X
FSA1258AL8X
Package
Number
MAC08A
MAC08A
MAC08A
MAC08A
MAC08A
MAC08A
Code
Top Mark
EB
FN
EC
FP
ED
FS
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
Pb-Free 8-Lead MicroPak, 1.6 mm Wide
5K Units on Tape and Reel
5K Units on Tape and Reel
5K Units on Tape and Reel
5K Units on Tape and Reel
5K Units on Tape and Reel
5K Units on Tape and Reel
Package Description
Supplied As
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
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
Switch Voltage (V
S
) (Note 2)
Input Voltage (V
IN
) (Note 2)
Input Diode Current
Switch Current
Peak Switch Current (Pulsed at
1 ms duration,
10% Duty Cycle)
Power Dissipation @ 85
q
C
MicroPak 8L package
Storage Temperature Range (T
STG
)
Maximum Junction Temperature (T
J
)
Lead Temperature (T
L
)
Soldering, 10 seconds
ESD
Human Body Model
FSA1256, FSA1257, FSA1258
FSA1256A, FSA1257A, FSA1258A
5.5kV
4.5kV
180 mW
400 mA
0.5V to
6.0V
0.5V to V
CC
0.5V
0.5V to
6.0V
50 mA
200 mA
Recommended Operating
Conditions
Supply Voltage (V
CC
)
FSA1256, FSA1257, FSA1258
FSA1256A, FSA1257A, FSA1258A
Control Input Voltage (V
IN
) (Note 3)
Switch Input Voltage (V
IN
)
Operating Temperature (T
A
)
Thermal Resistance (
T
JA
) in still air
MicroPak 8L package
224
q
C/W
(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.
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.
1.65V to 5.5V
2.7V to 5.5V
0V to V
CC
0V to V
CC
40
q
C to
85
q
C
65
q
C to
150
q
C
150
q
C
260
q
C
DC Electrical Characteristics
(All typical values are @ 25
q
C unless otherwise specified)
Symbol
V
IH
V
IL
Parameter
Input Voltage High
Input Voltage Low
V
CC
(V)
2.7 to 3.6
4.5 to 5.5
2.7 to 3.6
2.7 to 3.6
4.5 to 5.5
I
IN
I
NO(OFF)
,
I
NC(OFF)
R
ON
Switch On Resistance
(Note 4)
On Resistance Matching
Between Channels
(Note 5)
R
FLAT(ON)
On Resistance Flatness
(Note 6)
I
CC
I
CCT
Quiescent Supply Current
Increase in I
CC
per Input
2.7
4.5
3.6
5.5
4.3
1.4
0.2
0.1
0.1
0.2
0.3
0.5
0.5
0.4
1.0
1.0
10.0
4.5
0.06
0.12
0.15
Control Input Leakage
OFF-Leakage Current
2.7 to 3.6
4.5 to 5.5
5.5
2.7
4.5
-2.0
2.6
0.95
2.0
4.0
1.15
T
A
Min
25
q
C
Typ
Max
T
A
40
q
C to
85
q
C
Min
2.0
2.4
0.4
0.6
0.8
Max
Units
V
Conditions
FSA1256A, FSA1257A, FSA1258A Only
V
1.0
1.0
20.0
1.0
1.0
20.0
4.3
1.3
P
A
nA
V
IN
A
0V to V
CC
1V, 4.5V
1V, 4.5V
1.5V
3.5V
3.5V
0V, 0.75V, 1.5V
0V, 1V, 2V
100 mA, 1B or 2B
100 mA, 1B or 2B
100 mA, 1B or 2B
100 mA, 1B or 2B
100 mA, 1B or 2B
0V or V
CC
, I
OUT
0V
1B or 2B
I
OUT
I
OUT
I
OUT
I
OUT
I
OUT
V
IN
:
'
R
ON
:
:
P
A
P
A
One Input at 2.6V, Others at V
CC
or GND
(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:
'
R
ON
R
ONmax
R
ONmin
measured at identical V
CC
, 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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