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_______________General Description
The DG308A/DG309 are quad, single-pole-single-throw
(SPST) analog switches. The DG308A is normally open
(SPST, NO), while the DG309 is normally closed (SPST,
NC). Both parts feature fast switching speeds and low on-
resistance over the analog range. Other features include a
turn-on time under 120ns, a turn-off time under 90ns, and a
channel on-resistance of 60
. CMOS inputs provide
reduced input loading and very low leakage currents.
Both parts feature a 44V maximum breakdown voltage rat-
ing that allows 30V peak-to-peak switch-off blocking
capacity. The DG308A/DG309 can be used with split sup-
plies (5V to 20V) or a single positive supply (+5V to
+30V), while retaining CMOS-logic-compatible inputs.
________________________Applications
Sample-and-Hold Circuits
Test Equipment
Communications Systems
PBX, PABX
Guidance and Control Systems
Heads-Up Displays
Military Radios
____________________________Features
o
60
r
DS(ON)
o
Single/Bipolar-Supply Operation
o
CMOS Logic Compatible
o
Monolithic, Low-Power CMOS Design
DG308A/DG309
Quad, SPST Analog Switches
________________________________________________________________
Maxim Integrated Products
1
DIP/SO
LOGIC
DG308A
TRUTH TABLE
0
1
OFF
ON
DG309
ON
OFF
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
IN2
D2
S2
V+ (SUBSTRATE)
V-
S1
D1
IN1
DG308A
DG309
N.C.
S3
D3
IN3
IN4
D4
S4
GND
TOP VIEW
______Pin Configuration/Truth Table
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
DG308A
DG309
V
IN
10V
5k
-15V
+15V
*
*
*
*
5k
40k
10k
20k
V
OUT
PROGRAMMABLE-GAIN AMPLIFIER
* PINS 1, 8, 9, AND 16 ARE LOGIC-CONTROL INPUTS.
__________Typical Operating Circuit
19-3926; Rev 0; 3/91
PART
DG308A
CJ
DG308ACY
DG308ACK
0C to +70C
0C to +70C
0C to +70C
TEMP. RANGE
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
16 CERDIP
______________Ordering Information
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883.
DG308AC/D
0C to +70C
Dice*
DG308ADJ
DG308ADY
DG308ADK
-40C to +85C
-40C to +85C
-40C to +85C
16 Plastic DIP
16 Narrow SO
16 CERDIP
DG308AAK
-55C to +125C
16 CERDIP**
DG309
CJ
DG309CY
DG309CK
0C to +70C
0C to +70C
0C to +70C
16 Plastic DIP
16 Narrow SO
16 CERDIP
DG309C/D
0C to +70C
Dice*
DG309DJ
DG309DY
DG309DK
-40C to +85C
-40C to +85C
-40C to +85C
16 Plastic DIP
16 Narrow SO
16 CERDIP
DG309AK
-55C to +125C
16 CERDIP**
DG308A/DG309
Quad, SPST Analog Switches
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = 15V, V- = -15V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 2)
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.
Voltage Referenced to V-
V+ ....................................................................................+44V
GND .................................................................................+25V
Digital Inputs V
S
, V
D
................(V- - 2V) to (V+ + 2V) or 20mA,
whichever occurs first
Current into Any Terminal (except S or D) ..........................30mA
Continuous Current (S or D)................................................20mA
Peak Current (S or D)
(pulsed at 1ms, 10% duty cycle max) ............................70mA
Continuous Power Dissipation (TA = +70C) (Note 1)
Plastic DIP (derate 10.53mW/C above +70C)............842mW
Narrow SO (derate 8.70mW/C above +70C) .............696mW
CERDIP (derate 10.00mW/C above +70C) ................800mW
Operating Temperature Ranges
DG308AC_/DG309C_ .........................................0C to +70C
DG308AD_/DG309D_ ......................................-40C to +85C
DG308AAK/DG309AK ...................................-55C to +125C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10sec) .............................+300C
T
A
= +25C,
T
MIN
T
A
= +25C
T
A
= +25C,
T
MAX
T
A
= +25C,
T
MAX
T
A
= T
MAX
T
A
= T
MAX
T
A
= +25C
T
A
= T
MAX
T
A
= +25C
CONDITIONS
A
-1
-0.001
1
I
INL
Input Current with
Input Voltage Low
A
-1
0.001
1
I
INH
Input Current with
Input Voltage High
60
100
V
-15
15
V
ANALOG
Analog Signal Range
nA
-100
100
I
S(OFF)
Source-Off
Leakage Current
95
150
r
DS(ON)
Drain-Source
On-Resistance
-1
0.1
1
-100
100
-1
-0.1
1
UNITS
DG30_AK
MIN
TYP
MAX
SYMBOL
PARAMETER
V
IN
= 0V
V
IN
= 15V
V
IN
= 3.5V (DG308A),
V
IN
= 11V (DG309),
V
S
= -14V, V
D
= 14V
V
IN
= 11V (DG308A),
V
IN
= 3.5V (DG309),
I
S
= 1mA,
V
D
= 10V or -10V
V
IN
= 3.5V (DG308A),
V
IN
= 11V (DG309),
V
S
= 14V, V
D
= -14V
T
A
= T
MAX
T
A
= +25C
T
A
= T
MAX
T
A
= +25C
nA
-100
100
I
D(OFF)
Drain-Off
Leakage Current
-1
0.1
1
-100
100
V
IN
= 3.5V (DG308A),
V
IN
= 11V (DG309),
V
S
= -14V, V
D
= 14V
-1
0.1
1
V
IN
= 3.5V (DG308A),
V
IN
= 11V (DG309),
V
S
= 14V, V
D
= -14V
T
A
= T
MAX
T
A
= +25C
T
A
= T
MAX
T
A
= +25C
nA
-200
200
I
D(ON)
Drain-On
Leakage Current
-2
0.1
2
-200
200
V
IN
= 11V (DG308A),
V
IN
= 3.5V (DG309),
V
S
= V
D
= -14V
-2
0.1
2
V
IN
=11V (DG308A),
V
IN
= 3.5V (DG309),
V
S
= V
D
= +14V
-200
200
-1
0.001
1
-1
0.001
1
-5
0.1
5
-200
200
-5
0.1
5
60
100
-15
15
-100
100
80
125
-5
0.1
5
-100
100
-5
0.1
5
DG30_C/D
MIN
TYP
MAX
-100
100
-5
0.1
5
-100
100
-5
0.1
5
SWITCH
INPUT
DG308A/DG309
Quad, SPST Analog Switches
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, V- = -15V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 2)
8
27
Drain-Off
Capacitance
C
D(OFF)
8
pF
Channel-On
Capacitance
C
D(ON)
+
C
S(ON)
27
pF
V
IN
= 0V (DG308A), V
IN
= 15V (DG309),
f = 140kHz, V
S
= 0V
V
IN
= 0V (DG308A), V
IN
= 15V (DG309),
V
D
= V
S
= 0V
-100
Negative Supply
Current
I-
-100
A
All channels on or off,
V
IN
= 0V or 15V
T
A
= T
MAX
-10
Charge Injection
Q
-10
pC
C
L
= 0.01F, V
GEN
= 0V, R
GEN
= 0
90
150
Turn-Off Time
t
OFF
90
150
ns
130
200
78
11
Turn-On Time
t
ON
130
200
ns
Off Isolation
(Note 3)
OIRR
78
dB
Source-Off
Capacitance
C
S(OFF)
Figure 1
11
pF
V
IN
= 0V (DG308A), V
IN
= 15V (DG309),
Z
L
= 75
, V
S
= 2V
p-p
, f = 500kHz
V
IN
= 0V (DG308A), V
IN
= 15V (DG309),
f = 140kHz, V
S
= 0V
Figure 1
-100 -0.001 100
-10
-0.001
10
T
A
= +25C
100
I+
100
A
All channels on or off,
V
IN
= 0V or 15V
T
A
= T
MAX
-100 0.001
100
Positive Supply
Current
-10
0.001
10
T
A
= +25C
DG30_C/D
MIN
TYP
MAX
PARAMETER
SYMBOL
DG30_AK
MIN
TYP
MAX
UNITS
CONDITIONS
Note 1:
All leads are soldered or welded to the PC board.
Note 2:
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:
Off isolation = 20log10 V
D
/V
S
, V
D
= output, V
S
= input to off switch.
50%
OV
V
S
0V
t
ON
t
OFF
0.9V
O
0.9V
O
LOGIC
INPUT IN1
t
r
< 20ns
t
f
< 20ns
SWITCH
INPUT
SWITCH
OUTPUT VO
SWITCH
INPUT
V
S
= +3V
SWITCH
OUTPUT
V
O
LOGIC
INPUT
D1
S1
IN1
+15V
V+
GND
0V
V-
-15V
R
L
1k
C
L
35pF
V
O
= V
S
R
L
R
L
+ r
DS(ON)
(REPEAT TEST FOR S2, S3, AND S4)
Figure 1. Switching-Time Test Circuit
SUPPLY
DYNAMIC
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.
4
___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
1991 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
DG308A/DG309
Quad, SPST Analog Switches
__________________________________________Typical Operating Characteristics
(T
A
= +25C, unless otherwise noted.)
500
0
0
DRAIN-SOURCE ON-RESISTANCE
vs. DRAIN VOLTAGE & POWER SUPPLIES
400
DG308A309 TOC01
VD (V)
r
DS(ON)
(
)
15
200
100
5
10
300
20
V+ = 5V
V+ = 10V
V+ = 15V
V+ = 20V
T
A
= +25C
V- = GND
500
600
700
800
0
POWER-SUPPLY CURRENT
AND VOLTAGE vs. TEMPERATURE
400
DG308A309 TOC02
TEMPERATURE (C)
I
SUPPLY
(nA)
200
100
300
-50
125
25
-25
0
75
50
100
V+ = 44V
V+ = 30V
V+ = 5V
V+ = 10V
T
A
= +25C
V- = GND
250
0
-15
DRAIN-SOURCE ON-RESISTANCE
vs. DRAIN VOLTAGE & POWER SUPPLIES
200
DG308A309 TOC04
VD (V)
r
DS(ON)
(
)
0
100
50
-10
-5
150
5
10
15
V+ = 5V
V+ = 10V
V+ = 12V
V+ = 15V
T
A
= +25C
-30
-12
LEAKAGE CURRENTS vs.
ANALOG VOLTAGE
10
20
DG308A309 TOC03
VANALOG (V)
I
S
, I
D
(pA)
6
-10
-20
-6
0
0
12
T
A
= +25C
V
CC
= 15V
I
S(OFF)
I
D(OFF)
I
D(ON)
_____________________Pin Description
Ground
GND
5
No Connect. Not internally
connected.
N.C.
12
Positive Supply Voltage Input.
Connected to substrate.
V+
13
Negative Supply Voltage Input
V-
4
Source Input
S1S4
3, 6, 11, 14
PIN
Drain Output
D1D4
2, 7, 10, 15
Logic Control Inputs
IN1IN4
1, 8, 9, 16
FUNCTION
NAME
__________Applications Information
The DG308A/DG309 switch positive analog signals while
using a single positive supply, allowing use in applica-
tions where only one supply is available. The disadvan-
tages of using a single supply are slower switching
speed and increased r
DS(ON)
. The
Power-Supply
Current and Voltage vs. Temperature graph shows the
typical curve for a single-supply design. As stated in the
Absolute Maximum Ratings, the analog voltage should
not go above or below the supply voltages, which are V+
and 0V in single-supply operation.
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