DG444/DG445
Improved, Quad, SPST Analog Switches
________________________________________________________________
Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
_______________General Description
Maxim's redesigned DG444/DG445 analog switches
now feature on-resistance matching (4
max) between
switches and guaranteed on-resistance flatness over
the signal range (9
max). These low on-resistance
switches conduct equally well in either direction. They
guarantee low charge injection (10pC max), low power
consumption (35W max), and an ESD tolerance of
2000V minimum per Method 3015.7. The new design
offers lower off leakage current over temperature (less
than 5nA at +85C).
The DG444/DG445 are quad, single-pole/single-throw
(SPST) analog switches. The DG444 has 4 normally
closed switches and the DG445 has 4 normally open
switches. Switching times are less than 250ns for t
ON
and less than 70ns for t
OFF
. Operation is from a single
+10V to +30V supply, or bipolar 4.5V to 20V sup-
plies. Maxim's improved DG444/DG445 continue to be
fabricated with a 44V silicon-gate process.
________________________Applications
Sample-and-Hold Circuits
Communication Systems
Test Equipment
Battery-Operated Systems
Heads-Up Displays
PBX, PABX
Guidance and Control Systems
Audio Signal Routing
Military Radios
Modems/Faxes
______________________New Features
o
Plug-In Upgrades for Industry-Standard DG444/DG445
o
Improved r
ON
Match Between Channels (4
max)
o
Guaranteed r
FLAT(ON)
Over Signal Range (9
max)
o
Improved Charge Injection (10pC max)
o
Improved Off Leakage Current Over Temperature
(<5nA at +85C)
o
Withstand Electrostatic Discharge (2000V min)
per Method 3015.7
__________________Existing Features
o
Low r
DS(ON)
(85
max)
o
Single-Supply Operation +10V to +30V
Bipolar-Supply Operation 4.5V to 20V
o
Low Power Consumption (35W max)
o
Rail-to-Rail Signal Handling
o
TTL/CMOS-Logic Compatible
______________Ordering Information
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
PART
TEMP. RANGE
PIN-PACKAGE
DG444
CJ
0C to +70C
16 Plastic DIP
DG444DY
0C to +70C
16 Narrow SO
DG444C/D
0C to +70C
Dice*
DG444DJ
-40C to +85C
16 Plastic DIP
DG444DY
-40C to +85C
16 Narrow SO
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
IN2
D2
S2
V+
V-
S1
D1
IN1
DG445
V
L
S3
D3
IN3
IN4
D4
S4
GND
DIP/SO
DIP/SO
DG445
LOGIC
SWITCH
0
1
OFF
ON
SWITCHES SHOWN FOR LOGIC "0" INPUT
DG444
LOGIC
SWITCH
0
1
ON
OFF
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
IN2
D2
S2
V+
V-
S1
D1
IN1
DG444
V
L
S3
D3
IN3
IN4
D4
S4
GND
TOP VIEW
_____________________Pin Configurations/Functional Diagrams/Truth Tables
19-4705; Rev 1; 4/94
DG444/DG445
Improved, Quad, SPST Analog Switches
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS--Dual Supplies
(V+ = 15V, V- = -15V, V
L
= 5V, GND = 0V, V
INH
= 2.4V, V
INL
= 0.8V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
Stresses beyond those listed under "Absolute Maximum Ratings" 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 the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
PARAMETER
SYMBOL
UNITS
r
FLAT(ON)
15
9
r
DS(ON)
4
100
-0.50
0.01
0.50
Source Leakage Current
(Note 5)
I
S(OFF)
-5
5
nA
-0.50
0.01
0.50
Drain-Off Leakage Current
(Note 5)
I
D(OFF)
-5
5
nA
Analog Signal Range
-15
15
V
Drain-Source
On-Resistance
r
DS(ON)
50
85
-0.50
0.08
0.50
Drain-On Leakage Current
(Note 5)
-10
10
nA
I
INH
-0.5
-0.00001
0.5
A
I
INL
-0.5
-0.00001
0.5
A
CONDITIONS
(Note 3)
Voltage Referenced to V-
V+........................................................................................44V
GND ....................................................................................25V
V
L
....................................................(GND -0.3V) to (V+ +0.3V)
Digital Inputs V
S
, V
D
(Note 1).........(V- -2V) to (V+ +2V) or 30mA
(whichever occurs first)
Continuous Current (any terminal) ......................................30mA
Peak Current, S or D (pulsed at 1ms, 10% duty cycle max) .100mA
Continuous Power Dissipation (T
A
= +70C)
16-Pin Plastic DIP (derate 10.53mW/C above +70C) 842mW
16-Pin Narrow SO (derate 8.70mW/C above +70C) ..696mW
Operating Temperature Ranges
DG444C/DG445C ................................................0C to +70C
DG444D/DG445D .............................................-40C to +85C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10sec) .............................+300C
V
ANALOG
T
A
= +25C
V+ = 13.5V, V- = -13.5V,
V
D
= 8.5V,
I
S
= -10mA
T
A
= T
MIN
to T
MAX
On-Resistance Match
Between Channels (Note 4)
T
A
= +25C
5
T
A
= T
MIN
to T
MAX
V
D
= 10V,
I
S
= -10mA
T
A
= +25C
T
A
= T
MIN
to T
MAX
On-Resistance Flatness (Note 4)
V
D
= 5V,
I
S
= -10mA
T
A
= +25C
T
A
= T
MIN
to T
MAX
V+ = 16.5V, V- = -16.5V,
V
D
= 15.5V,
V
S
= 15.5V
I
D(ON)
or
I
S(ON)
Input Current with
Input Voltage High
Input Current with
Input Voltage Low
T
A
= +25C
T
A
= T
MIN
to T
MAX
T
A
= +25C
T
A
= T
MIN
to T
MAX
V
IN
= 2.4V, all others = 0.8V
V
IN
= 0.8V, all others = 2.4V
V+ = 16.5V, V- = -16.5V,
V
D
= 15.5V,
V
S
= 15.5V
V+ = 16.5V, V- = -16.5V,
V
D
= 15.5V,
V
S
= 15.5V
MIN
TYP
MAX
(Note 2)
SWITCH
INPUT
Note 1:
Signals on S, D, or IN exceeding V+ or V- are clamped by internal diodes. Limit forward current to maximum current rating.
DG444/DG445
Improved, Quad, SPST Analog Switches
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS--Dual Supplies (continued)
(V+ = 15V, V- = -15V, V
L
= 5V, GND = 0V, V
INH
= 2.4V, V
INL
= 0.8V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
T
A
= +25C
SYMBOL
MIN
TYP
MAX
(Note 2)
T
A
= T
MIN
to T
MAX
UNITS
T
A
= +25C
I-
-5
5
A
Negative Supply Current
T
A
= T
MIN
to T
MAX
-1
-0.0001
1
Positive Supply Current
I+
-1
0.001
1
T
A
= +25C
T
A
= +25C
-1
0.001
1
Logic Supply Current
I
L
-5
5
A
Turn-On Time
V
S
= 10V, Figure 2
t
ON
-1
-0.0001
1
150
250
Ground Current
ns
I
GND
-5
5
A
Power-Supply Range
V+, V-
4.5
20.0
V
T
A
= T
MIN
to T
MAX
CONDITIONS
All channels on or off,
V+ = 16.5V, V- = -16.5V,
V
IN
= 0V or 5V
-5
5
All channels on or off,
V+ = 16.5V, V- = -16.5V,
V
IN
= 0V or 5V
All channels on or off,
V+ = 16.5V, V- = -16.5V,
V
IN
= 0V or 5V
A
T
A
= T
MIN
to T
MAX
All channels on or off,
V+ = 16.5V, V- = -16.5V,
V
IN
= 0V or 5V
T
A
= +25C
T
A
= +25C
Turn-Off Time
DG444, V
S
= 10V, Figure 2
90
120
ns
T
A
= +25C
DG445, V
S
= 10V, Figure 2
t
OFF
110
170
ns
T
A
= +25C
Off-Isolation Rejection
Ratio (Note 6)
OIRR
60
dB
T
A
= +25C
Charge Injection (Note 3)
Q
5
10
pC
T
A
= +25C
Crosstalk (Note 7)
100
dB
T
A
= +25C
Source-Off Capacitance
f = 1MHz, Figure 6
C
S(OFF)
4
pF
T
A
= +25C
Drain-Off Capacitance
f = 1MHz, Figure 6
C
D(OFF)
4
pF
C
L
= 1nF, V
GEN
= 0V,
R
GEN
= 0
, Figure 3
R
L
= 50
, C
L
= 5pF,
f = 1MHz, Figure 4
R
L
- 50
, C
L
= 5pF,
f = 1MHz, Figure 5
T
A
= +25C
Source-On Capacitance
f = 1MHz, Figure 7
C
S(ON)
16
pF
T
A
= +25C
Drain-On Capacitance
f = 1MHz, Figure 7
C
D(ON)
16
pF
SUPPLY
DYNAMIC
DG444/DG445
Improved, Quad, SPST Analog Switches
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS--Single Supply
(V+ = 12V, V- = 0V, V
L
= 5V, GND = 0V, V
INH
= 2.4V, V
INL
= 0.8V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
SYMBOL
MIN
TYP
MAX
(Note 2)
UNITS
T
A
= +25C
100
160
T
A
= T
MIN
to T
MAX
-1
0.001
1
Power-Supply Current
I+
-5
5
A
Analog Signal Range
0
12
V
CONDITIONS
All channels on or off,
V
IN
= 0V or 5V
(Note 3)
T
A
= +25C
T
A
= T
MIN
to T
MAX
-1
-0.0001
1
Negative Supply Current
I-
-5
5
A
All channels on or off,
V
IN
= 0V or 5V
T
A
= +25C
T
A
= T
MIN
to T
MAX
-1
-0.0001
1
Ground Current
I
GND
-5
5
A
All channels on or off,
V
IN
= 0V or 5V
T
A
= +25C
T
A
= T
MIN
to T
MAX
-1
0.001
1
Logic Supply Current
I
L
-5
5
A
All channels on or off,
V
IN
= 0V or 5V
V
ANALOG
V
10.8
24.0
V+, V-
Power-Supply Range
T
A
= +25C
200
T
A
= T
MIN
to T
MAX
r
DS(ON)
Drain-Source
On-Resistance
V+ = 10.8V,
V
L
= 5.25V,
V
D
= 3V, 8V,
I
S
= -10mA
T
A
= +25C
300
400
V
S
= 8V, Figure 2
ns
t
ON
Turn-On Time
T
A
= +25C
60
200
V
S
= 8V, Figure 2
ns
t
OFF
Turn-Off Time
T
A
= +25C
5
10
pC
Q
Charge Injection (Note 3)
C
L
= 1nF, V
GEN
= 0V,
R
GEN
= 0
, Figure 3
Note 2:
Typical values are for
design aid only,
are not guaranteed and are not subject to production testing. The algebraic convention,
where the most negative value is a minimum and the most positive value a maximum, is used in this data sheet.
Note 3:
Guaranteed by design.
Note 4:
On-resistance match between channels and flatness are guaranteed only with bipolar-supply operation. Flatness is defined
as the difference between the maximum and the minimum value of on-resistance as measured at the extremes of the speci-
fied analog signal range.
Note 5:
Leakage parameters I
S(OFF)
, I
D(OFF)
, I
D(ON)
, and IS
(ON)
, are100% tested at the maximum rated hot temperature and guaranteed at +25C.
Note 6:
Off-Isolation Rejection Ratio = 20log (V
D
/V
S
), V
D
= output, V
S
= input to off switch.
Note 7:
Between any two switches.
SWITCH
DYNAMIC
SUPPLY
__________________________________________Typical Operating Characteristics
(T
A
= +25C, unless otherwise noted.)
ON LEAKAGE CURRENTS
ON LEAKAGE
(nA)
-2
-1
0
1
2
-15
0
15
VS, VD (V)
T
A
= +125C
T
A
= +85C
V+ = 15V
V- = -15V
DG444/5-1
-10
-5
5
10
OFF LEAKAGE CURRENTS
OFF LEAKAGE (nA)
-1
0
-0.5
0.5
1
VS, VD (V)
DG444/5-2
-15
0
15
-10
-5
5
10
T
A
= +125C
V+ = 15V
V- = -15V
T
A
= +85C
SWITCHING THRESHOLD vs.
BIPOLAR SUPPLY VOLTAGE
V
IN
(V)
0
0.5
1.5
2.0
2.5
3.0
3.5
5
10
15
20
BIPOLAR SUPPLY VOLTAGE (V)
DG444/5-3
IN HI MIN
IN LOW MAX
DG444/DG445
Improved, Quad, SPST Analog Switches
_______________________________________________________________________________________
5
____________________________Typical Operating Characteristics (continued)
(T
A
= +25C, unless otherwise noted.)
ON-RESISTANCE vs. VD
AND UNIPOLAR-SUPPLY VOLTAGE
0
25
50
75
100
125
0
5
10
15
20
VD (V)
r
DS(ON)
(
)
DG444/5-4
V+ = 10V
V+ = 15V
V+ = 20V
150
V+ = 5V
ON-RESISTANCE vs. VD, UNIPOLAR-
SUPPLY VOLTAGE AND TEMPERATURE
0
25
50
75
100
125
150
r
DS(ON)
(
)
0
4
8
12
VD (V)
DG444/5-7
T
A
= +125C
T
A
= +25C
T
A
= -40C
V+ = 12V
V- = 0V
ON-RESISTANCE vs. VD AND
BIPOLAR-SUPPLY VOLTAGE
r
DS(ON)
(
)
30
60
90
120
-20
-10
0
10
20
VD (V)
0
DG444/5-5
5V
10V
15V
20V
ON-RESISTANCE vs. VD, BIPOLAR
SUPPLY VOLTAGE AND TEMPERATURE
r
DS(ON)
(
)
0
20
40
60
80
100
VD (V)
DG444/5-6
T
A
= +125C
T
A
= -55C
T
A
= +25C
V+ = 15V, V- = -15V
-15
0
15
-10
-5
5
10
SWITCHING TIME vs.
BIPOLAR-SUPPLY VOLTAGE
TIME (ns)
0
40
80
120
160
5
10
15
20
BIPOLAR-SUPPLY VOLTAGE (V)
DG444/5-8
tON
tOFF
SWITCHING TIME vs.
UNIPOLAR-SUPPLY VOLTAGE
TIME (ns)
0
50
100
150
200
10
15
20
25
UNIPOLAR-SUPPLY VOLTAGE (V)
V- = 0V
DG444/5-9
tON
tOFF
CHARGE INJECTION vs.
VD VOLTAGE
Q (pC)
-20
0
20
-15
-10
0
10
15
VD (V)
DG444/5-10
V+ = 15V
V- = -15V
CL = 1nF
CHARGE INJECTION vs.
VD VOLTAGE
Q (pC)
-10
0
0
5
10
15
VD (V)
DG444/5-11
V+ = 12V
V- = 0V
CL = 1nF
10
______________________________________________Timing Diagrams/Test Circuits
t
OFF
0.8 x V
OUT
V
OUT
0.8 x V
OUT
tf < 20ns
tr < 20ns
50%
0V
0V
+3V
SWITCH
OUTPUT
LOGIC INPUT WAVEFORM IS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
t
ON
SWITCH
INPUT
LOGIC
INPUT
+3V
IN
+5V
V-
-15V
( )
R
L
C
L
V
OUT
S
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
GND
REPEAT TEST FOR CHANNELS 2, 3, AND 4.
V
OUT
= V
D
R
L
R
L
+ r
DS(ON)
LOGIC
INPUT
V
L
+15V
V+
D
DG444
DG445
Figure 2. Switching Time
__________Applications Information
General Operation
1. Switches are open when power is off.
2. IN, D, and S should not exceed V+ or V-, even with
the power off.
3. Switch leakage is from each analog switch terminal
to V+ or V-, not to other switch terminals.
Operation with Supply Voltages
Other Than 15V
Using supply voltages other than 15V will reduce the
analog signal range. The DG444/DG445 switches oper-
ate with 4.5V to 20V bipolar supplies or with a +10V
to +30V single supply; connect V- to 0V when operating
with a single supply. Also, all device types can operate
with unbalanced supplies such as +24V and -5V. V
L
must be connected to +5V to be TTL compatible, or to
V+ for CMOS-logic level inputs. The
Typical Operating
Characteristics graphs show typical on-resistance with
20V, 15V, 10V, and 5V supplies. (Switching times
increase by a factor of two or more for operation at 5V.)
Overvoltage Protection
Proper power-supply sequencing is recommended
for all CMOS devices. Do not exceed the absolute
maximum ratings because stresses beyond the list-
ed ratings may cause permanent damage to the
devices. Always sequence V+ on first, followed by
V
L
, V-, and logic inputs. If power-supply sequenc-
ing is not possible, add two small, external signal
diodes in series with supply pins for overvoltage
protection (Figure 1). Adding diodes reduces the
analog signal range to 1V below V+ and 1V above
V-, but low switch resistance and low leakage char-
acteristics are unaffected. Device operation is
unchanged, and the difference between V+ and V-
should not exceed +44V.
DG444/DG445
Improved, Quad, SPST Analog Switches
6
_______________________________________________________________________________________
_____________________Pin Description
V+
D
V-
S
V
g
Figure 1. Overvoltage Protection Using External Blocking Diodes
2, 15, 10, 7
Positive Supply-Voltage Input--
connected to substrate
V+
13
Logic Supply-Voltage Input
V
L
12
Ground
GND
5
Negative Supply-Voltage Input
V-
4
PIN
Source Outputs
S1-S4
3, 14, 11, 6
Drain Outputs
D1-D4
Logic Control Inputs
IN1-IN4
1, 16, 9, 8
FUNCTION
NAME
DG444/DG445
Improved, Quad, SPST Analog Switches
_______________________________________________________________________________________
7
V
OUT
OFF
ON
OFF
V
OUT
IN
DG444
IN
DG445
OFF
OFF
ON
Q =
V
OUT
C
L
-15V
V-
V+
IN
GND
S
+15V
R
GEN
V
GEN
V
IN
= +3V
C
L
V
OUT
V
L
+5V
D
DG444
DG445
Figure 3. Charge Injection
_________________________________Timing Diagrams/Test Circuits (continued)
NETWORK
ANALYZER
SIGNAL
GENERATOR
R
GEN
= 50
D
S
GND
R
L
10dBm
10nF
V+
+15V
IN
0V or +2.4V
V-
-15V
10nF
+5V
V
L
DG444
DG445
Figure 4. Off-Isolation Rejection Ratio
NETWORK
ANALYZER
SIGNAL
GENERATOR
R
GEN
= 50
0V or +2.4V
IN
D
GND
R
L
10dBm
10nF
+15V
D
IN
S
NC
0V or +2.4V
50
V-
-15V
10nF
+5V
S
V
L
V+
DG444
DG445
Figure 5. Crosstalk
CAPACITANCE
METER
D
S
GND
10nF
+15V
IN
0V or +2.4V
V-
-15V
10nF
f = 1MHz
+5V
V
L
V+
DG444
DG445
Figure 6. Source/Drain-Off Capacitance
D
S
GND
10nF
+15V
IN
0V or +2.4V
V-
-15V
10nF
V+
+5V
V
L
V
D
DG444
DG445
CAPACITANCE
METER
f = 1MHz
Figure 7. Source/Drain-On Capacitance
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8
___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
1994 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
DG444/DG445
Improved, Quad, SPST Analog Switches
___________________Chip Topography
S2
V+
S3
V
L
S1
D2
D3
IN3
IN4
0.091"
(2.31mm)
0.071"
(1.80mm)
IN2
IN1
D1
V-
GND
D4
S4
TRANSISTOR COUNT: 126
SUBSTRATE CONNECTED TO V+
_Ordering Information (continued)
* Contact factory for dice specifications.
PART
TEMP. RANGE
PIN-PACKAGE
DG445
CJ
0C to +70C
16 Plastic DIP
DG445CY
0C to +70C
16 Narrow SO
DG445C/D
0C to +70C
Dice*
DG445DJ
-40C to +85C
16 Plastic DIP
DG445DY
-40C to +85C
16 Narrow SO
________________________________________________________Package Information
C
A
A2
E1
D
E
e
A
e
B
A3
B1
B
DIM
A
A1
A2
A3
B
B1
C
D
D1
E
E1
e
e
A
e
B
L
MIN
0.015
0.125
0.055
0.016
0.050
0.008
0.745
0.005
0.300
0.240
0.115
0
MAX
0.200
0.150
0.080
0.022
0.065
0.012
0.765
0.030
0.325
0.280
0.400
0.150
15
MIN
0.38
3.18
1.40
0.41
1.27
0.20
18.92
0.13
7.62
6.10
2.92
0
MAX
5.08
3.81
2.03
0.56
1.65
0.30
19.43
0.76
8.26
7.11
10.16
3.81
15
INCHES
MILLIMETERS
2.54 BSC
7.62 BSC
0.100 BSC
0.300 BSC
A1
L
D1
e
21-587A
16-PIN PLASTIC
DUAL-IN-LINE
PACKAGE
PDF 
ZIP