AS1741, AS1742, AS1743
H i g h - Sp e e d , L o w - Vo l ta g e , S i n g l e - S u p p l y, 0 . 8Ω,
Dual SPST Analog Switches
D a ta S he e t
1 General Description
The AS1741/AS1742/AS1743 are high-speed, low-volt-
age, dual single-pole/single-throw (SPST) analog
switches.
Fast switching speeds, low ON-resistance, and low
power-consumption make these devices ideal for single-
cell battery powered applications.
These highly-reliable devices operate from a single +1.6
to +3.6V supply, and are differentiated by the type and
number of switches as listed in
Table 1.
Table 1. Standard Products
Model
AS1741
AS1742
AS1743
Switch Types
Two Normally Open (NO) Switches
Two Normally Closed (NC) Switches
One NO Switch and One NC Switch
2 Key Features
!
ON-Resistance:
- 0.8Ω (+3V supply)
- 2.5Ω (+1.8V supply)
!
!
!
!
!
!
!
!
!
!
!
R
ON
Matching: 0.08Ω (+3V supply)
R
ON
Flatness: 0.18Ω (+3V supply)
Supply Voltage Range: +1.6 to +3.6V
Switching Action: t
ON
= 22ns, t
OFF
= 14ns
Current-Handling: 250mA Continuous
Break-Before-Make Switching (AS1743)
Rail-to-Rail Signal Handling
1.8V CMOS Logic Compatible (+3V supply)
Total Harmonic Distortion: 0.03%
Operating Temperature Range: -40 to +85ºC
Package Types:
- 8-pin MSOP
- 8-pin SOT23
The AS1743 supports break-before-make switching.
With very low ON-resistance (R
ON
), R
ON
matching, and
R
ON
flatness, the devices can accurately switch signals
for sample and hold circuits, digital filters, and op-amp
gain switching networks.
The AS1741/AS1742/AS1743 digital logic input is 1.8V
CMOS-compatible when using a single +3V supply, and
all devices can handle Rail-to-Rail signals.
The devices are available in an 8-pin MSOP package
and an 8-pin SOT23 package.
3 Applications
The devices are ideal for use in power routing systems,
cordless and mobile phones, MP3 players, CD and DVD
players, PDAs, handheld computers, digital cameras,
hard drives, and any other application where high-speed
signal switching is required.
Figure 1. MSOP Block Diagrams
AS1741
NO1
V+
NC1
AS1742
V+
NO1
AS1743
V+
COM1
IN1
COM1
IN1
COM1
IN1
IN2
COM2
IN2
COM2
IN2
COM2
GND
NO2
GND
NC2
GND
NC2
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Revision 1.78
1 - 15
AS1741
Data Sheet
- Pinout
4 Pinout
Pin Assignments
Figure 2. MSOP Pin Assignments (Top View)
NO1 1
8 V+
NC1 1
8 V+
NO1 1
8 V+
COM1 2
7 IN1
COM1 2
7 IN1
COM1 2
7 IN1
AS1741
IN2 3
6 COM2
IN2 3
AS1742
6 COM2
IN2 3
AS1743
6 COM2
GND 4
5 NO2
GND 4
5 NC2
GND 4
5 NC2
Figure 3. SOT23 Pin Assignments (Top View)
IN1 1
8 NO1
IN1 1
8 NC1
IN1 1
8 NO1
V+ 2
7 COM1
V+ 2
7 COM1
V+ 2
7 COM1
AS1741
NO2 3
6 IN2
NC2 3
AS1742
6 IN2
NC2 3
AS1743
6 IN2
COM2 4
5 GND
COM2 4
5 GND
COM2 4
5 GND
Pin Descriptions
Table 2. Pin Descriptions
Pin Number
Pin Name
COM1
COM2
GND
IN1
See
Figure 2
and
Figure 3
IN2
NC1
NC2
NO1
NO2
V+
Analog Switch 1 Common
Analog Switch 2 Common
Ground
Analog Switch 1 Logic Control Input
Analog Switch 2 Logic Control Input
Analog Switch 1 Normally Closed Terminal
Analog Switch 2 Normally Closed Terminal
Analog Switch 1 Normally Open Terminal
Analog Switch 2 Normally Open Terminal
Input Supply Voltage.
+1.6 to +3.6V
Description
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Revision 1.78
2 - 15
AS1741
Data Sheet
- Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in
Table 3
may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in
Section 6 Electrical
Characteristics on page 4
is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 3. Absolute Maximum Ratings
Parameter
V+, INx to GND
COMx, NOx, NCx to GND
†
Min
-0.3
-0.3
-250
-350
Max
+5
V+
+ 0.3
+250
+350
362
2500
150
250
Units
V
V
mA
mA
mW
V
mA
mA
ºC
ºC
ºC
Comments
COMx, NOx, NCx Continuous Current
COMx, NOx, NCx Peak Current
Continuous Power Dissipation (T
AMB
= +70ºC)
Electro-Static Discharge
Latch Up Immunity IN1, IN2
Latch Up Immunity all other Pins
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Pulsed at 1ms 10% duty cycle
Derate at 4.5mW/ºC above +70ºC
HBM Mil-Std883E 3015.7
methods
Norm:
JEDEC 17
-40
-65
+85
+150
+150
Package Body Temperature
+260
ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020C “Moisture/Reflow
Sensitivity Classification for Non-Hermetic
Solid State Surface Mount Devices”
†
Signals on pins COM1, COM2, NO1, NO2, NC1, or NC2 that exceed V+ or GND are clamped by internal diodes.
Limit forward-diode current to the maximum current rating.
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Revision 1.78
3 - 15
AS1741
Data Sheet
- Electrical Characteristics
6 Electrical Characteristics
Table 4. Power Supply Characteristics
Symbol
V+
I+
Parameter
Power Supply Range
Positive Supply
Current
V+ = 3.6V, V
INx
= 0 or V+, all channels on or off
Conditions
Min
1.6
0.01
Typ
Max Unit
3.6
1
V
µA
V+ = +2.7 to +3.6V, V
IH
= +1.4V, V
IL
= +0.5V, T
AMB
= T
MIN
to T
MAX
(unless otherwise specified). Typ values @ V+ =
+3.0V, T
AMB
= +25ºC.
Table 5. +3V Supply Electrical Characteristics
Symbol
Parameter
Analog Switch
V
COMx
,
V
NOx
, V
NCx
Analog Signal Range
R
ON
ΔR
ON
R
FLAT(ON)
I
NOx(OFF)
,
I
NCx(OFF)
I
COMx(OFF)
ON-Resistance
ON-Resistance Match
1
Between Channels
ON-Resistance
2
Flatness
NOx or NCx Off-
Leakage Current
COMx Off-Leakage
Current
COMx On-Leakage
Current
Conditions
Min
0
T
AMB
= +25ºC
T
AMB
= T
MIN
to T
MAX
T
AMB
= +25ºC
V+ = 2.7V, I
COMx
= 100mA,
V
NOx
or V
NCx
= 1.5V
T
AMB
= T
MIN
to T
MAX
T
AMB
= +25ºC
V+ = 2.7V, I
COMx
= 100mA,
V
NOx
or V
NCx
= 1, 1.5, or 2V T
AMB
= T
MIN
to T
MAX
V+ = 3.3V,
T
AMB
= +25ºC
V
COMx
= 0.3 or 3.0V, V
NOx
or
T
AMB
= T
MIN
to T
MAX
V
NCx
= 3.0 or 0.3V
V+ = 3.3V,
T
AMB
= +25ºC
V
COMx
= 0.3 or 3.0V,
T
AMB
= T
MIN
to T
MAX
V
NOx
or V
NCx
= 3.0, 0.3V
V+ = 3.3V,
T
AMB
= +25ºC
V
COMx
= 3.0 or 0.3V,
T
AMB
= T
MIN
to T
MAX
NOx
or V
NCx
= 3.0 or 0.3V
V+ = 2.7V, I
COMx
= 100mA,
V
NOx
or V
NCx
= 1.5V
V
NOx
or V
NCx
= 1.5V,
T
AMB
= +25ºC
R
LOAD
= 50Ω, C
LOAD
= 35pF,
T
AMB
= T
MIN
to T
MAX
Figures
12, 13
V
NOx
or V
NCx
= 1.5V,
T
AMB
= +25ºC
R
LOAD
= 50Ω, C
LOAD
= 35pF,
T
AMB
= T
MIN
to T
MAX
Figures
12, 13
V
NOx
or V
NCx
= 1.5V,
T
AMB
= +25ºC
R
LOAD
= 50Ω, C
LOAD
= 35p,
T
AMB
= T
MIN
to T
MAX
Figure
14
(AS1743)
8-pin MSOP
V
GEN
= 3.3V, R
GEN
= 0,
C
LOAD
= 1.0nF, Figure
15
8-pin SOT23
f = 1MHz, Figure
16
f = 1MHz, Figure
16
f = 1MHz, Figure
16
Signal = 0, R
IN
= R
OUT
= 50Ω,
C
LOAD
= 5pF, Figure
17
f = 1MHz, V
COMx
= 1V
RMS
,
R
LOAD
= 50Ω, C
LOAD
= 5pF, Figure
17
f = 1MHz, V
COMx
= 1V
RMS
,
R
LOAD
= 50Ω, C
LOAD
= 5pF, Figure
17
f = 20Hz to 20kHz,
V
COMx
= 2Vp-p, R
LOAD
= 32Ω
0.35
0.02
0.02
-1
-5
-1
-5
-2
-10
13
Typ
Max Unit
V+
0.8
0.9
0.08
0.09
0.18
0.20
1
5
1
5
2
10
22
24
7
14
15
6
1
6
5
35
35
35
130
-55
-100
0.03
ns
pC
pF
pF
pF
MHz
dB
dB
%
ns
ns
nA
nA
V
Ω
Ω
Ω
nA
I
COMx(ON)
Switch Dynamic Characteristics
t
ON
Turn On Time
3
t
OFF
Turn Off Time
3
t
BBM
Q
C
OFF
C
COMx(OFF)
C
COMx(ON)
BW
V
ISO
Break Before Make
Charge Injection
3
NOx, NCx Off-
Capacitance
COMx Off-Capacitance
COMx On-Capacitance
-3dB On-Channel
Bandwidth
Off-Isolation
Crosstalk
5
4
THD
Total Harmonic
Distortion
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Revision 1.78
4 - 15
AS1741
Data Sheet
- Electrical Characteristics
Table 5. +3V Supply Electrical Characteristics (Continued)
Symbol
Parameter
Logic Input
V
IH
Input Logic High
V
IL
Input Logic Low
I
IN
Input Leakage Current
Conditions
Min
1.5
V
INx
= 0 or V+
-1000
0.1
0.5
1000
Typ
Max Unit
V
V
nA
V+
= +1.8V,
V
IH
= +1.0V,
V
IL
= 0.4V,
T
AMB
= T
MIN
to T
MAX
(unless otherwise specified). Typ values @
T
AMB
= +25ºC.
Table 6. +1.8V Supply Electrical Characteristics
Symbol
Parameter
Analog Switch
V
COMx
,
V
NOx
, V
NCx
Analog Signal Range
R
ON
I
NOx(OFF)
,
I
NCx(OFF)
I
COMx(OFF)
I
COMx(ON)
ON-Resistance
NOx or NCx Off-
Leakage Current
COMx Off-Leakage
Current
COMx On-Leakage
Current
Conditions
Min
0
T
AMB
= +25ºC
T
AMB
= T
MIN
to T
MAX
T
AMB
= +25ºC
V
COMx
= 0.3 or 1.5V, V
NOx
or V
NCx
= 1.5 or 0.3V
T
AMB
= T
MIN
to T
MAX
T
AMB
= +25ºC
V
COMx
= 0.3 or 1.5V, V
NOx
or V
NCx
= 1.5 or 0.3V
T
AMB
= T
MIN
to T
MAX
T
AMB
= +25ºC
V
COMx
= 0.3 or 1.5V,
V
NOx
or V
NCx
= 0.3 or 1.5V T
AMB
= T
MIN
to T
MAX
I
COMx
= 10mA,
V
NOx
or V
NCx
= 0.9V
V
NOx
or V
NCx
= 1.5V,
R
LOAD
= 50Ω,
C
LOAD
= 35pF,
Figures
12, 13
V
NOx
or V
NCx
= 1.5V,
R
LOAD
= 50Ω,
C
LOAD
= 35pF,
Figures
12, 13
V
NOx
or V
NCx
= 1.5V,
R
LOAD
= 50Ω,
C
LOAD
= 35p,
Figure
14,
(AS1743)
V
GEN
= 1.8V, R
GEN
= 0,
C
LOAD
= 1.0nF, Figure
15
T
AMB
= +25ºC
T
AMB
= T
MIN
to T
MAX
T
AMB
= +25ºC
T
AMB
= T
MIN
to T
MAX
T
AMB
= +25ºC
T
AMB
= T
MIN
to T
MAX
1
6
2.5
-50
-100
1
V
INx
= 0 or V+
-1000
0.1
0.4
1000
8
ns
12
0.9
-1
-5
-1
-5
-2
-10
21
Typ
Max
V+
2.5
3
1
5
1
5
2
10
30
35
20
25
ns
ns
Unit
V
Ω
nA
nA
nA
Switch Dynamic Characteristics
t
ON
Turn On Time
3
t
OFF
Turn Off Time
3
t
BBM
Break-Before-Make
3
Q
V
ISO
Charge Injection
Off-Isolation
Crosstalk
5
4
8-pin MSOP
8-pin SOT23
f = 1MHz, V
COMx
= 1V
RMS
,
R
LOAD
= 50Ω, C
LOAD
= 5pF, Figure
17
f = 1MHz, V
COMx
= 1V
RMS
,
R
LOAD
= 50Ω, C
LOAD
= 5pF, Figure
17
pC
dB
dB
V
V
nA
Logic Input
V
IH
Input Logic High
V
IL
Input Logic Low
I
IN
Input Leakage Current
1.
ΔR
ON
= R
ON(MAX)
- R
ON(MIN)
.
2. Flatness is defined as the difference between the maximum and the minimum value of ON-resistance as measured
over the specified analog signal ranges.
3. Guaranteed by design.
4. Off-Isolation = 20log10(V
COMx
/V
NOx
), V
COMx
= output, V
NOx
= input to off switch.
5. Between two switches.
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