NC7SB3157, FSA3157 — Low-Voltage SPDT Analog Switch or 2:1 Multiplexer / De-multiplexer Bus Switch
September 2008
NC7SB3157, FSA3157
Low-Voltage SPDT Analog Switch or 2:1Multiplexer /
De-multiplexer Bus Switch
Features
■
Useful in Both Analog and Digital Applications
■
Space-Saving, SC70 6-Lead Surface Mount Package
■
Ultra-Small, MicroPak™ Leadless Package
■
Low On Resistance: <10Ω on Typical at 3.3V V
CC
■
Broad V
CC
Operating Range: 1.65V to 5.5V
■
Rail-to-Rail Signal Handling
■
Power-Down, High-Impedance Control Input
■
Over-Voltage Tolerance of Control Input to 7.0V
■
Break-Before-Make Enable Circuitry
■
250MHz, 3dB Bandwidth
Description
The NC7SB3157 / FSA3157 is a high-performance, sin-
gle-pole / double-throw (SPDT) analog switch or 2:1 mul-
tiplexer / de-multiplexer bus switch.
The device is fabricated with advanced sub-micron
CMOS technology to achieve high-speed enable and
disable times and low on resistance. The break-before-
make select circuitry prevents disruption of signals on
the B Port due to both switches temporarily being
enabled during select pin switching. The device is speci-
fied to operate over the 1.65 to 5.5V V
CC
operating
range. The control input tolerates voltages up to 5.5V,
independent of the V
CC
operating range.
Ordering Information
Part Number
NC7SB3157P6X
NC7SB3157L6X
FSA3157P6X
FSA3157L6X
Top
Mark
B7A
BB
B7A
BB
Eco Status
RoHS
RoHS
RoHS
RoHS
Package Description
6-Lead, SC70, EIAJ SC88, 1.25mm Wide Package
6-Lead, MicroPak 1.0mm Wide Package
6-Lead, SC70, EIAJ SC88, 1.25mm Wide Package
6-Lead, MicroPak 1.0mm Wide Package
Packing
Method
3000 Units on
Tape and Reel
5000 Units on
Tape and Reel
3000 Units on
Tape and Reel
5000 Units on
Tape and Reel
For Fairchild’s definition of “green” Eco Status, please visit:
http://www.fairchildsemi.com/company/green/rohs_green.html.
MicroPak™ is a trademark of Fairchild Semiconductor Corporation.
©2006 Fairchild Semiconductor Corporation
NC7SB3157, FSA3157 Rev. 1.0.3
www.fairchildsemi.com
NC7SB3157, FSA3157 — Low-Voltage SPDT Analog Switch or 2:1 Multiplexer / De-multiplexer Bus Switch
Logic Symbol
B
1
S
B
0
A
Connection Diagrams
Figure 1. Logic Symbol
2. Pin Assignments SC70
Analog Symbol
B
1
GND
S
V
CC
A
B
0
Figure 3. Analog Symbol
Figure 4. Pin One Orientation
Note:
Orientation of top mark determines pin one location.
Read the top product code mark left to right and pin one
is the lower left pin
(see Figure 4).
Function Table
Input (S)
Logic Level Low
Logic Level High
Function
B
0
Connected to A
B
1
Connected to A
B
1
1
6
S
V
CC
A
Pin Descriptions
Pin Names
A, B
0
, B
1
S
GND
2
5
Description
Data Ports
Control Input
Figure 5. Pad Assignments for MicroPak™
B
0
3
4
© 2006 Fairchild Semiconductor Corporation
NC7SB3157, FSA3157 Rev. 1.0.3
2
www.fairchildsemi.com
NC7SB3157, FSA3157 — Low-Voltage SPDT Analog Switch or 2:1 Multiplexer / De-multiplexer Bus Switch
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, 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
S
V
IN
I
IK
I
OUT
I
CC
/I
GND
T
STG
T
J
T
L
P
D
ESD
Supply Voltage
Parameter
DC Switch Voltage
(1)
DC Input Voltage
(1)
DC Input Diode Current at V
IN
< 0V
DC Output Current
DC V
CC
or Ground Current
Storage Temperature Range
Junction Temperature Under Bias
Junction Lead Temperature (Soldering, 10 seconds)
Power Dissipation at +85°C
Human Body Model, JESD22-A114
Min.
–0.5
–0.5
–0.5
Max.
+7.0
V
CC
+0.5
+7.0
–50
128
±100
Unit
V
V
V
mA
mA
mA
°C
°C
°C
mW
V
–65
+150
+150
+260
180
4000
Note:
1. The input and output negative voltage ratings may be exceeded if the 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. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
V
CC
V
IN
V
IN
V
OUT
T
A
t
r
, t
f
θ
JA
Parameter
Supply Voltage Operating
Control Input Voltage
(2)
Switch Input Voltage
(2)
Output Voltage
(2)
Operating Temperature
Control Input
V
CC
= 2.3V–3.6V
Control Input
V
CC
= 4.5V–5.5V
Min.
1.65
0
0
0
–40
0
0
Max.
5.50
V
CC
V
CC
V
CC
+85
10
5
270
Unit
V
V
V
V
°C
ns/V
ns/V
°C/W
Input Rise and Fall Time
Thermal Resistance, SC70
Note:
2. Control input must be held HIGH or LOW; it must not float.
© 2006 Fairchild Semiconductor Corporation
NC7SB3157, FSA3157 Rev. 1.0.3
3
www.fairchildsemi.com
NC7SB3157, FSA3157 — Low-Voltage SPDT Analog Switch or 2:1 Multiplexer / De-multiplexer Bus Switch
DC Electrical Characteristics
Symbol
Parameter
High Level
Input Voltage
Low Level
Input Voltage
Input Leakage
Current
Off State Leakage
Current
0
≤
V
IN
≤
5.5V
0
≤
A, B
≤
V
CC
V
IN
= 0V, I
O
= 30mA
V
IN
= 2.4V, I
O
= –30mA
V
IN
= 4.5V, I
O
= –30mA
R
ON
Switch On
Resistance
(3)
V
IN
= 0V, I
O
= 24mA
V
IN
= 3V, I
O
= –24mA
V
IN
= 0V, I
O
= 8mA
V
IN
= 2.3V, I
O
= –8mA
V
IN
= 0V, I
O
= 4mA
V
IN
= 1.65V, I
O
= –4mA
I
CC
Quiescent Supply
Current;
All Channels On or
Off
Analog Signal
Range
I
A
= –30mA, 0
≤
V
Bn
≤
V
CC
R
RANGE
On Resistance Over I
A
= –24mA, 0
≤
V
Bn
≤
V
CC
Signal Range
(3, 7)
I
A
= –8mA, 0
≤
V
Bn
≤
V
CC
I
A
= –4mA, 0
≤
V
Bn
≤
V
CC
I
A
= –30mA, V
Bn
= 3.15
ΔR
ON
On Resistance
Match Between-
Channels
(3, 4, 5)
I
A
= –24mA, V
Bn
2.1
I
A
= –8mA, V
Bn
= 1.6
I
A
= –4mA, V
Bn
= 1.15
I
A
= –30mA, 0
≤
V
Bn
≤
V
CC
R
flat
On Resistance
Flatness
(3, 4, 6)
I
A
= –24mA, 0
≤
V
Bn
≤
V
CC
I
A
= –8mA, 0
≤
V
Bn
≤
V
CC
I
A
= –4mA, 0
≤
V
Bn
≤
V
CC
V
IN
= V
CC
or GND I
OUT
= 0
5.5
1.65
2.3
3.0
Conditions
V
CC
(V)
T
A
= +25°C
Min.
Typ.
Max.
T
A
= –40°C to
+85°C
Min.
0.75 V
CC
0.7 V
CC
Units
Max.
V
0.25 V
CC
0.3 V
CC
±1
±1
7.0
12.0
15.0
9.0
20.0
12.0
30.0
20.0
50.0
Ω
V
µA
µA
V
IH
V
IL
I
IN
I
OFF
1.65 – 1.95 0.75 V
CC
2.3 – 5.5
1.65 – 1.95
2.3 – 5.5
0 – 5.5
1.65 – 5.5
4.5
±0.05
±0.05
3.0
5.0
7.0
4.0
10.0
5.0
13.0
6.5
17.0
0.7 V
CC
0.25 V
CC
0.3 V
CC
±0.1
±0.1
7.0
12.0
15.0
9.0
20.0
12.0
30.0
20.0
50.0
1
10
µA
V
CC
4.5
3.0
2.3
1.65
4.5
3.0
2.3
1.65
5.0
3.3
2.5
1.8
0
V
CC
0
V
CC
25.0
50.0
100
300
V
Ω
0.15
0.2
0.5
0.50
6.0
12.0
28.0
125
Ω
Ω
Notes:
3. Measured by the voltage drop between A and B pins at the indicated current through the switch. On resistance is
determined by the lower of the voltages on the two (A or B Ports).
4. Parameter is characterized, but not tested in production.
5.
ΔR
ON
= R
ON
max – R
ON
minimum measured at identical V
CC
, temperature, and voltage levels.
6. Flatness is defined as the difference between the maximum and minimum value of on resistance over the specified
range of conditions.
7. Guaranteed by design.
© 2006 Fairchild Semiconductor Corporation
NC7SB3157, FSA3157 Rev. 1.0.2
4
www.fairchildsemi.com
NC7SB3157, FSA3157 — Low-Voltage SPDT Analog Switch or 2:1 Multiplexer / De-multiplexer Bus Switch
AC Electrical Characteristics
Symbol
Parameter
Conditions
V
CC
(V)
1.65 – 1.95
t
PHL
,
t
PLH
Propagation Delay
Bus-to-Bus
(8)
V
I
= OPEN
2.3 – 2.7
3.0 – 3.6
4.5 – 5.5
1.65 – 1.95
t
PZL
,
t
PZH
Output Enable Time
Turn-On Time
(A to B
n
)
V
I
= 2 x V
CC
for t
PZL
V
I
= 0V for t
PZH
2.3 – 2.7
3.0 – 3.6
4.5 – 5.5
1.65 – 1.95
t
PLZ
,
t
PHZ
Output Disable Time
Turn-Off Time
(A Port to B Port)
V
I
= 2 x V
CC
for t
PLZ
V
I
= 0V for t
PHZ
2.3 – 2.7
3.0 – 3.6
4.5 – 5.5
1.65 –1.95
t
B-M
Break-Before-Make
Time
(9)
2.3 – 2.7
3.0 – 3.6
4.5 – 5.5
Q
OIRR
Xtalk
BW
THD
Charge Injection
(9)
Off Isolation
(10)
Crosstalk
–3dB Bandwidth
Total Harmonic
Distortion
(9)
C
L
= 0.1nF, V
GEN
= 0V,
R
GEN
=
0Ω
R
L
= 50Ω, f = 10MHz
R
L
= 50Ω, f = 10MHz
R
L
= 50Ω
R
L
= 600Ω, 0.5 V
PP
,
f = 600 Hz to 20 KHz
5.0
3.3
1.65 – 5.5
1.65 – 5.5
1.65 – 5.5
5.0
7.0
3.5
2.5
1.7
3.0
2.0
1.5
0.8
0.5
0.5
0.5
0.5
7.0
3.0
–57.0
–54.0
250
.011
T
A
= –40°C to
Figure
+85°C
Units
Number
Min. Typ. Max. Min. Max.
T
A
= +25°C
3.5
1.2
0.8
0.3
23.0
13.0
6.9
5.2
12.5
7.0
5.0
3.5
7.0
3.5
2.5
1.7
3.0
2.0
1.5
0.8
0.5
0.5
0.5
0.5
pC
dB
dB
Figure 15
Figure 16
Figure 17
ns
Figure 14
3.5
1.2
0.8
0.3
24.0
14.0
7.6
5.7
13.0
7.5
5.3
3.8
ns
Figure 12
Figure 13
ns
Figure 12
Figure 13
ns
Figure 12
Figure 13
MHz Figure 20
%
Notes:
8. This parameter is guaranteed by design but not tested. The bus switch contributes no propagation delay other than
the RC delay of the on resistance of the switch and the 50pF load capacitance, when driven by an ideal voltage
source (zero output impedance).
9. Guaranteed by design.
10. Off Isolation = 20 log
10
[V
A
/ V
Bn
].
Capacitance
T
A
= +25°C, f = 1MHz. Capacitance is characterized, but not tested in production.
Symbol
C
IN
C
IO-B
C
IOA-ON
Parameter
Control Pin Input Capacitance
B Port Off Capacitance
A Port Capacitance When Switch Is Enabled
Conditions
V
CC
= 0V
V
CC
= 5.0V
V
CC
= 5.0V
Typ.
2.3
6.5
18.5
Max.
Units
pF
pF
pF
Figure
Number
Figure 18
Figure 19
© 2006 Fairchild Semiconductor Corporation
NC7SB3157, FSA3157 Rev. 1.0.2
5
www.fairchildsemi.com
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