NC7SBU3157, FSAU3157 — Low-Voltage SPDT Analog Switch or 2:1 Multiplexer / De-multiplexer Bus Switch
April 2008
NC7SBU3157, FSAU3157
Low-Voltage SPDT Analog Switch or 2:1
Multiplexer / De-multiplexer Bus Switch
Features
■
Analog and digital applications
■
Space-saving, SC70 6-lead, surface-mount 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
■
250 MHz, 3dB bandwidth
General Description
The NC7SBU3157 / FSAU3157 is a high-performance,
single-pole / double-throw (SPDT) analog switch or 2:1
multiplexer / 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.
Fairchild's integrated Undershoot Hardened Circuit
(UHC
®
) senses undershoot at the I/Os, and responds by
preventing voltage differentials from developing and
turning the switch on.
Ordering Information
Top
Mark
B7A
B7A
Part Number
NC7SBU3157P6X
FSAU3157P6X
Operating
Temperature
Range
-40 to +85°C
-40 to +85°C
Package Description
6-Lead, SC70, EIAJ SC88, 1.25mm Wide Package
6-Lead, SC70, EIAJ SC88, 1.25mm Wide Package
Packing
Method
3000 Units
Tape and Reel
3000 Units
Tape and Reel
All packages are lead free per JEDEC: J-STD-020B standard.
MicroPak™ is a trademark of Fairchild Semiconductor Corporation.
UHC
®
is a registered trademark of Fairchild Semiconductor Corporation.
©2005 Fairchild Semiconductor Corporation
NC7SBU3157, FSAU3157 Rev. 1.0.4
www.fairchildsemi.com
NC7SBU3157, FSAU3157 — 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 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
Pin Descriptions
Pin Names
A, B
0
, B
1
S
Description
Data Ports
Control Input
© 2005 Fairchild Semiconductor Corporation
NC7SBU3157, FSAU3157 Rev. 1.0.4
2
www.fairchildsemi.com
NC7SBU3157, FSAU3157 — 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
Note:
Supply Voltage
DC Switch Voltage
(1)
DC Input Voltage
(1)
Parameter
Min.
–0.5
–0.5
–0.5
Max.
+7.0
V
CC
+0.5
+7.0
–50
128
±100
Units
V
V
V
mA
mA
mA
°C
°C
°C
mW
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
–65
+150
+150
+260
180
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
Supply Voltage Operating
Control Input Voltage
(2)
Switch Input Voltage
(2)
Output Voltage
(2)
Operating Temperature
Input Rise and Fall Time
Thermal Resistance
Parameter
Min.
1.65
0
0
0
–40
Max
5.50
V
CC
V
CC
V
CC
+85
10
5
350
Units
V
V
V
V
°C
ns/V
ns/V
°C/W
Control Input V
CC
=2.3V–3.6V
Control Input V
CC
=4.5V–5.5V
0
0
Note:
2. Control input must be held HIGH or LOW; it must not float.
© 2005 Fairchild Semiconductor Corporation
NC7SBU3157, FSAU3157 Rev. 1.0.4
3
www.fairchildsemi.com
NC7SBU3157, FSAU3157 — 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
0
≤
V
IN
≤
5.5V
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
15.0
15.0
15.0
20.0
20.0
30.0
30.0
50.0
50.0
Ω
V
µA
µA
V
IH
V
IL
I
IN
I
OFF
1.65 to 1.95 0.75 V
CC
2.3 to 5.5
1.65 to 1.95
2.3 to 5.5
0 to 5.5
1.65 to 5.5
4.5
±0.05
±0.05
3.0
5.0
7.0
3.0
2.3
1.65
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
15.0
15.0
15.0
20.0
20.0
30.0
30.0
50.0
50.0
Off State Leakage
0
≤
A, B
≤
V
CC
Current
V
IN
=0V, I
O
=30mA
V
IN
=2.4V, I
O
=–30mA
V
IN
=4.5V, I
O
=–30mA
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
Quiescent Supply
Current;
V =V or GND I
OUT
=0
All Channels On or
IN CC
Off
Analog Signal
Range
I
A
=–30mA, 0
≤
V
Bn
≤
V
CC
On Resistance
I
A
=–24mA, 0
≤
V
Bn
≤
V
CC
Over 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
On Resistance
Match Between-
Channels
(3, 4, 5)
Voltage Under-
shoot
I
A
=–24mA, V
Bn
2.1
I
A
=–8mA, V
Bn
=1.6
I
A
=–4mA, V
Bn
=1.15
R
ON
Switch On
Resistance
(3)
I
CC
5.5
1
10
µA
V
CC
4.5
3.0
2.3
1.65
4.5
3.0
2.3
1.65
5.5
5.0
3.3
2.5
1.8
0
V
CC
0
V
CC
25.0
50.0
100
300
V
R
RANGE
Ω
0.15
0.2
0.5
0.5
–2
6.0
12.0
28.0
125
Ω
V
Ω
ΔR
ON
V
IKU
0.0mA
≤
I
IN
≤–50,
OE 5.5v
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
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.
© 2005 Fairchild Semiconductor Corporation
NC7SBU3157, FSAU3157 Rev. 1.0.4
4
www.fairchildsemi.com
NC7SBU3157, FSAU3157 — Low-Voltage SPDT Analog Switch or 2:1 Multiplexer / De-multiplexer Bus Switch
AC Electrical Characteristics
Symbol
Parameter
Conditions
V
CC
(V)
1.65 to 1.95
t
PHL
,
t
PLH
Propagation Delay
Bus-to-Bus
(8)
V
I
= OPEN
2.3 to 2.7
3.0 to 3.6
4.5 to 5.5
1.65 to 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 to 2.7
3.0 to 3.6
4.5 to 5.5
1.65 to 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 to 2.7
3.0 to 3.6
4.5 to 5.5
1.65 to 1.95
t
BBM
Break-Before-Make
Time
(9)
2.3 to 2.7
3.0 to 3.6
4.5 to 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, 0.5V
PP
,
f = 20Hz to 20KHz
5.0
3.3
1.65 to 5.5
1.65 to 5.5
1.65 to 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
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 10
Figure 11
Figure 12
ns
Figure 9
1.2
0.8
0.3
24.0
14.0
7.6
5.7
13.0
7.5
5.3
3.8
ns
Figure 7
Figure 8
ns
Figure 7
Figure 8
ns
Figure 7
Figure 8
T
A
= –40°C to
+85°C
Units Figure
Min. Typ. Max. Min. Max.
T
A
= +25°C
MHz Figure 15
%
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
Figure 13
Figure 14
© 2005 Fairchild Semiconductor Corporation
NC7SBU3157, FSAU3157 Rev. 1.0.4
5
www.fairchildsemi.com
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