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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 60Ω. 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
♦60ΩrDS(ON)
♦Single/Bipolar-Supply Operation
♦CMOS Logic Compatible
♦Monolithic, Low-Power CMOS Design
DG308A/DG309
Quad, SPST Analog Switches
________________________________________________________________
Maxim Integrated Products
1
DIP/SO
LOGIC DG308A
TRUTH TABLE
0
1OFF
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
VIN ±10V 5k
-15V +15V
**
**
5k
40k
10k 20k
VOUT
PROGRAMMABLE-GAIN AMPLIFIER
* PINS 1, 8, 9, AND 16 ARE LOGIC-CONTROL INPUTS.
__________Typical Operating Circuit
19-3926; Rev 0; 3/91
PART
DG308ACJ
DG308ACY
DG308ACK 0°C to +70°C
0°C to +70°C
0°C to +70°C
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 0°C to +70°C Dice*
DG308ADJ
DG308ADY
DG308ADK -40°C to +85°C
-40°C to +85°C
-40°C to +85°C 16 Plastic DIP
16 Narrow SO
16 CERDIP
DG308AAK -55°C to +125°C 16 CERDIP**
DG309CJ
DG309CY
DG309CK 0°C to +70°C
0°C to +70°C
0°C to +70°C 16 Plastic DIP
16 Narrow SO
16 CERDIP
DG309C/D 0°C to +70°C Dice*
DG309DJ
DG309DY
DG309DK -40°C to +85°C
-40°C to +85°C
-40°C to +85°C 16 Plastic DIP
16 Narrow SO
16 CERDIP
DG309AK -55°C to +125°C 16 CERDIP**
DG308A/DG309
Quad, SPST Analog Switches
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = 15V, V- = -15V, TA= TMIN to TMAX, 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 VS, VD................(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= +70°C) (Note 1)
Plastic DIP (derate 10.53mW/°C above +70°C)............842mW
Narrow SO (derate 8.70mW/°C above +70°C) .............696mW
CERDIP (derate 10.00mW/°C above +70°C)................800mW
Operating Temperature Ranges
DG308AC_/DG309C_.........................................0°C to +70°C
DG308AD_/DG309D_......................................-40°C to +85°C
DG308AAK/DG309AK...................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
TA= +25°C,
TMIN
TA= +25°C
TA= +25°C,
TMAX
TA= +25°C,
TMAX
TA= TMAX
TA= TMAX
TA= +25°C
TA= TMAX
TA= +25°C
CONDITIONS
µA-1 -0.001 1IINL
Input Current with
Input Voltage Low
µA-1 0.001 1IINH
Input Current with
Input Voltage High
60 100
V-15 15VANALOG
Analog Signal Range
nA
-100 100
IS(OFF)
Source-Off
Leakage Current
Ω
95 150
rDS(ON)
Drain-Source
On-Resistance
-1 0.1 1
-100 100
-1 -0.1 1
UNITS
DG30_AK
MIN TYP MAX
SYMBOLPARAMETER
VIN = 0V
VIN = 15V
VIN = 3.5V (DG308A),
VIN = 11V (DG309),
VS= -14V, VD= 14V
VIN = 11V (DG308A),
VIN = 3.5V (DG309),
IS= 1mA,
VD= 10V or -10V
VIN = 3.5V (DG308A),
VIN = 11V (DG309),
VS= 14V, VD= -14V
TA= TMAX
TA= +25°C
TA= TMAX
TA= +25°C nA
-100 100
ID(OFF)
Drain-Off
Leakage Current
-1 0.1 1
-100 100
VIN = 3.5V (DG308A),
VIN = 11V (DG309),
VS= -14V, VD= 14V
-1 0.1 1
VIN = 3.5V (DG308A),
VIN = 11V (DG309),
VS= 14V, VD= -14V
TA= TMAX
TA= +25°C
TA= TMAX
TA= +25°C nA
-200 200
ID(ON)
Drain-On
Leakage Current
-2 0.1 2
-200 200
VIN = 11V (DG308A),
VIN = 3.5V (DG309),
VS= VD= -14V
-2 0.1 2
VIN =11V (DG308A),
VIN = 3.5V (DG309),
VS= VD= +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, TA= TMIN to TMAX, unless otherwise noted.) (Note 2)
8
27
Drain-Off
Capacitance CD(OFF) 8 pF
Channel-On
Capacitance CD(ON) +
CS(ON) 27 pF
VIN = 0V (DG308A), V IN = 15V (DG309),
f = 140kHz, VS= 0V
VIN = 0V (DG308A), VIN = 15V (DG309),
VD= VS= 0V
-100
Negative Supply
Current I- -100 µA
All channels on or off,
VIN = 0V or 15V TA= TMAX
-10Charge Injection Q -10 pCCL= 0.01µF, VGEN = 0V, RGEN = 0Ω90 150Turn-Off Time tOFF 90 150 ns
130 200
78
11
Turn-On Time tON 130 200 ns
Off Isolation
(Note 3) OIRR 78 dB
Source-Off
Capacitance CS(OFF)
Figure 1
11 pF
VIN = 0V (DG308A), V IN = 15V (DG309),
ZL= 75Ω, VS= 2Vp-p, f = 500kHz
VIN = 0V (DG308A), VIN = 15V (DG309),
f = 140kHz, VS= 0V
Figure 1
-100 -0.001 100-10 -0.001 10TA= +25°C 100
I+ 100 µA
All channels on or off,
VIN = 0V or 15V TA= TMAX
-100 0.001 100
Positive Supply
Current -10 0.001 10TA= +25°C
DG30_C/D
MIN TYP MAX
PARAMETER SYMBOL DG30_AK
MIN TYP MAX UNITSCONDITIONS
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 VD/VS, VD= output, VS= input to off switch.
50%
OV
VS
0V tON
tOFF
0.9VO0.9VO
LOGIC
INPUT IN1
tr < 20ns
tf < 20ns
SWITCH
INPUT
SWITCH
OUTPUT VO
SWITCH
INPUT
VS = +3V
SWITCH
OUTPUT
VO
LOGIC
INPUT
D1S1
IN1
+15V
V+
GND
0V V-
-15V
RL
1k CL
35pF
VO = VSRL
RL + 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
(TA = +25°C, unless otherwise noted.)
500
00
DRAIN-SOURCE ON-RESISTANCE
vs. DRAIN VOLTAGE & POWER SUPPLIES
400
DG308A309 TOC01
VD (V)
rDS(ON) (Ω)
15
200
100
510
300
20
V+ = 5V
V+ = 10V
V+ = 15V
V+ = 20V
TA = +25°C
V- = GND
500
600
700
800
0
POWER-SUPPLY CURRENT
AND VOLTAGE vs. TEMPERATURE
400
DG308A309 TOC02
TEMPERATURE (°C)
ISUPPLY (nA)
200
100
300
-50 12525-25 0 7550 100
V+ = 44V
V+ = 30V
V+ = 5V
V+ = 10V
TA = +25°C
V- = GND
250
0-15
DRAIN-SOURCE ON-RESISTANCE
vs. DRAIN VOLTAGE & POWER SUPPLIES
200
DG308A309 TOC04
VD (V)
rDS(ON) (Ω)
0
100
50
-10 -5
150
51015
V+ = ±5V
V+ = ±10V
V+ = ±12V V+ = ±15V
TA = +25°C
-30
-12
LEAKAGE CURRENTS vs.
ANALOG VOLTAGE
10
20
DG308A309 TOC03
VANALOG (V)
IS, ID (pA)
6
-10
-20
-6 0
0
12
TA = +25°C
VCC = ±15V
IS(OFF)
ID(OFF)
ID(ON)
_____________________Pin Description
GroundGND5 No Connect. Not internally
connected.
N.C.12
Positive Supply Voltage Input.
Connected to substrate.
V+13
Negative Supply Voltage InputV-4
Source InputS1–S43, 6, 11, 14
PIN
Drain OutputD1–D42, 7, 10, 15
Logic Control InputsIN1–IN41, 8, 9, 16
FUNCTIONNAME
__________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 rDS(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.
