AS1744 , AS1745
H i g h - Sp e e d , L o w - Vo l ta g e , D u a l , S i n g l e - S u p p l y,
4
Ω,
S P D T A n a l o g S w i t c h e s
D a ta S he e t
1 General Description
The AS1744/AS1745 are high-speed, low-voltage, dual
single-pole/double-throw (SPDT) 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 +1.8 to
+5.5V supply, are differentiated by inverted logic, and
support break-before-make switching.
With 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 devices are available in a 10-pin MSOP package
and a 10-pin TDFN package.
2 Key Features
!
ON-Resistance:
- 4Ω (+5V supply)
- 5.5Ω (+3V supply)
R
ON
Matching: 0.2Ω (+5V supply)
R
ON
Flatness: 1Ω (+5V supply)
Supply Voltage Range: +1.8 to +5.5V
1.8V Operation:
- 9.5Ω ON-Resistance over Temperature
- 38ns Turn On Time
- 12ns Turn Off Time
Current-Handling: 100mA Continuous
Break-Before-Make Switching
Rail-to-Rail Signal Handling
Crosstalk: -90dB at 1MHz
Off-Isolation: -85dB at 1MHz
Total Harmonic Distortion: 0.1%
Operating Temperature Range: -40 to +85ºC
Package Types:
- 10-pin MSOP
- 10-pin TDFN
!
!
!
!
!
!
!
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!
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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,
and any other application where high-speed signal
switching is required.
Figure 1. Block Diagrams
1
IN1
2
NO1
3
GND
4
NO2
5
IN2
10
COM1
9
NC1
1
10
COM1
9
NO1
Truth Table
IN1
2
NC1
3
GND
4
NC2
5
IN2
INx
Low
High
NOx to NCx to
COMx COMx
Off
On
On
Off
AS1744
8
V+
7
NC2
6
COM2
AS1745
8
V+
7
NO2
6
COM2
Switches shown for low input.
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Revision 1.53
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AS1744/AS1745
Data Sheet
- P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
IN1 1
NO1 2
GND 3
NO2 4
IN2 5
10 COM1
9 NC1
IN1 1
NC1 2
GND 3
NC2 4
IN2 5
10 COM1
9 NO1
AS1744
8 V+
7 NC2
6 COM2
AS1745
8 V+
7 NO2
6 COM2
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
AS1744
10
6
3
1
5
9
7
2
4
8
AS1745
10
6
3
1
5
2
4
9
7
8
Pin Name
COM1
COM2
GND
IN1
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.
+1.8 to +5.5V
Description
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Revision 1.53
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AS1744/AS1745
Data Sheet
- A b s o l u t e
Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in
Table 2
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 2. Absolute Maximum Ratings
Parameter
V+, IN1, IN2 to GND
COMx, NOx, NCx to GND
†
Min
-0.3
-0.3
-100
-150
Max
+7
V+
+ 0.3
+100
+150
330
1000
100
Units
V
V
mA
mA
mW
V
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
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Pulsed at 1ms, 10% duty cycle
Derate at 4.7mW/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 1.53
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AS1744/AS1745
Data Sheet
- E l e c t r i c a l
Characteristics
6 Electrical Characteristics
V+ = +4.5 to 5.5V, V
IH
= +2.4V, V
IL
= +0.8V, T
AMB
= T
MIN
to T
MAX
(unless otherwise specified). Typ Values @T
AMB
= +25ºC.
Table 3. +5V Supply Electrical Characteristics
Symbol
Parameter
Analog Switch
V
COMx
,
Analog Signal
V
NOx
,
Range
V
NCx
R
ON
ON-Resistance
Conditions
Min
Typ
Max
Unit
0
V+ = 4.5V, I
COMx
= 10mA,
V
NOx
or V
NCx
= 0 to V+
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
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
0.5
-0.1
-0.3
-0.1
-3
-0.4
-4
2.4
±0.01
±0.01
±0.1
2.5
0.1
V+
4
4.5
0.2
0.4
1
1.2
0.1
0.3
0.1
3
0.4
4
V
Ω
Ω
Ω
nA
nA
nA
V
V
nA
ON-Resistance
V+ = 4.5V, I
COMx
= 10mA,
Match Between
ΔR
ON
V
NOx
or V
NCx
= 0 to V+
1
Channels
ON-Resistance
V+ = 4.5V, I
COMx
= 10mA,
R
FLAT(ON)
2
V
NOx
or V
NCx
= 0 to V+
Flatness
I
NOx(OFF)
, NOx or NCx Off-
V+ = 5.5V, V
COMx
= 1 or 4.5V,
I
NCx(OFF)
Leakage Current
3
V
NOx
or V
NCx
= 4.5 or 1V
COMx Off-
V+ = 5.5V, V
COMx
= 1 or 4.5V,
I
COMx(OFF)
3
V
NOx
or V
NCx
= 4.5 or 1V
Leakage Current
COMx On-
V+ = 5.5V, V
COMx
= 4.5 or 1V,
I
COMx(ON)
3
V
NOx
or V
NCx
= 4.5 or 1V
Leakage Current
Logic Input:
INx
V
IH
Input Logic High
V
IL
Input Logic Low
Input Leakage
I
IH
, I
IL
V
INx
= 0 or +5.5V
Current
Switch Dynamic Characteristics
t
ON
t
OFF
t
BBM
Turn On Time
Turn Off Time
3
3
0.8
-100
5
14
4
10
1
7
20
56
-52
100
17
18
6
8
Break-Before-
3
Make
Q
Charge Injection
C
NOx(OFF)
, NOx, NCx Off-
C
NCx(OFF)
Capacitance
COMx On-
C
COMx(ON)
Capacitance
V
ISO
Off-Isolation
4
T
AMB
= +25ºC
V
NOx
or V
NCx
= 3V, R
LOAD
= 300Ω,
C
LOAD
= 35pF, Figure 12
T
AMB
= T
MIN
to T
MAX
T
AMB
= +25ºC
V
NOx
or V
NCx
= 3V, R
LOAD
= 300Ω,
C
LOAD
= 35pF, Figure 12
T
AMB
= T
MIN
to T
MAX
T
AMB
= +25ºC
V
NOx
or V
NCx
= 3V, R
LOAD
= 300Ω,
C
LOAD
= 35pF, Figure 13
T
AMB
= T
MIN
to T
MAX
V
GEN
= 2V, R
GEN
= 0, C
LOAD
= 1.0nF, Figure 14
V
NOx
or V
NCx
= GND, f = 1MHz, Figure 15
V
COMx
= GND, f = 1MHz, Figure 15
f = 10MHz, R
LOAD
= 50Ω, C
LOAD
= 5pF,
Figure 16
f = 1MHz, R
LOAD
= 50Ω, C
LOAD
= 5pF,
Figure 16
f = 10MHz, R
LOAD
= 50Ω, C
LOAD
= 5pF,
Figure 16
f = 1MHz, R
LOAD
= 50Ω, C
LOAD
= 5pF,
Figure 16
f = 20Hz to 20kHz, V
NOx
= 5Vp-p, R
LOAD
= 600Ω
ns
ns
ns
pC
pF
pF
dB
-85
-52
dB
-90
0.1
%
V
CT
Crosstalk
5
Total Harmonic
Distortion
Power Supply
Positive Supply
I+
Current
THD
V+ = 5.5V, V
INx
= 0 or V+
0.01
1.0
µA
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Revision 1.53
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AS1744/AS1745
Data Sheet
- E l e c t r i c a l
Characteristics
V+ = +2.7 to 3.6V, V
IH
= +2.0V, V
IL
= +0.4V, T
AMB
= T
MIN
to T
MAX
(unless otherwise specified). Typ values @ T
AMB
= +25ºC.
Table 4. +3V Supply Electrical Characteristics
Symbol
Parameter
Analog Switch
V
COMx
,
V
NOx
,
Analog Signal Range
V
NCx
R
ON
ΔR
ON
R
FLAT(ON)
I
NOx(OFF)
,
I
NCx(OFF)
I
COMx(OFF)
I
COMx(ON)
ON-Resistance
ON-Resistance
Match Between
1
Channels
ON-Resistance
2
Flatness
NOx or NCx Off-
3
Leakage Current
COMx Off-Leakage
3
Current
Conditions
Min
Typ
Max Unit
0
V+ = 2.7V, I
COMx
= 10mA,
V
NOx
or V
NCx
= 0 to V+
V+ = 2.7V, I
COMx
= 10mA,
V
NOx
or V
NCx
= 0 to V+
V+ = 2.7V, I
COMx
= 10mA,
V
NOx
or V
NCx
= 0 to V+
V+ = 3.3V, V
COMx
= 1 or 3V,
V
NOx
or V
NCx
= 3 or 1V
V+ = 3.3V, V
COMx
= 1 or 3V,
V
NOx
or V
NCx
= 3 or 1V
V+ = 3.3V, V
COMx
= 1 or 3V,
V
NOx
or V
NCx
= 1 or 3V
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
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
-0.1
-0.3
-0.1
-3
-0.4
-4
2.0
±0.1
±0.01
±0.01
1.5
0.1
5
V+
5.5
8
0.2
0.4
2
2.5
0.1
0.3
0.1
3
0.4
4
V
Ω
Ω
Ω
nA
nA
nA
COMx On-Leakage
3
Current
Logic Input:
(INx)
V
IH
Input Logic High
V
IL
I
IH
,I
IL
Input Logic Low
Input Leakage
Current
Switch Dynamic Characteristics
t
ON
t
OFF
t
BBM
Q
C
NOx(OFF)
,
C
NCx(OFF)
C
COMx(ON)
V
ISO
V
CT
Power Supply
I+
Positive Supply
Current
Turn On Time
Turn Off Time
3
V
0.4
V
nA
5
17
6
11
100
23
28
8
10
V
INx
= 0 or +5.5V
T
AMB
= +25ºC
V
NOx
or V
NCx
= 2V, R
LOAD
=
300Ω, C
LOAD
= 35pF, Figure 12 T
AMB
= T
MIN
to T
MAX
T
AMB
= +25ºC
V
NOx
or V
NCx
= 2V, R
LOAD
=
300Ω, C
LOAD
= 35pF, Figure 12 T
AMB
= T
MIN
to T
MAX
-100
ns
ns
ns
pC
pF
pF
dB
dB
3
Break-Before-Make
Charge Injection
NOx, NCx Off-
Capacitance
COMx On-
Capacitance
Off-Isolation
Crosstalk
5
4
3
T
AMB
= +25ºC
V
NOx
or V
NCx
= 2V, R
LOAD
=
300Ω, C
LOAD
= 35pF, Figure 13 T
AMB
= T
MIN
to T
MAX
V
GEN
= 1.5V, R
GEN
= 0, C
LOAD
= 1.0nF, Figure 14
V
NOx
or V
NCx
= GND, f = 1MHz, Figure 15
V
COMx
= GND, f = 1MHz, Figure 15
f = 10MHz, R
LOAD
= 50Ω, C
LOAD
= 5pF, Figure 16
f = 1MHz, R
LOAD
= 50Ω, C
LOAD
= 5pF, Figure 16
f = 10MHz, R
LOAD
= 50Ω, C
LOAD
= 5pF, Figure 16
f = 1MHz, R
LOAD
= 50Ω, C
LOAD
= 5pF, Figure 16
V+ = 3.6V, V
IN
= 0 or +3.6V
1
0
20
56
-52
-85
-52
-90
0.01
1.0
µA
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 any two switches.
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