General Description
The MAX328/MA329 are monolithic CMOS analog multi-
plexers. The MAX328 is a single-ended, 1-of-8 device,
and the MAX329 is a differential, 2-of-8 device.
Designed to provide the lowest possible on- and off-
leakages, these multiplexers switch signals from high
source impedance, providing the mux operates into a
high-input-impedance op amp or A/D converter. The
MAX328/MAX329 are pin-for-pin replacements for the
popular DG508/DG509 in these applications.
Adding an external 40kΩresistor to each input makes
the MAX328/MAX329 an excellent fault-tolerant multi-
plexer. Low leakage (less than 1pA at +25°C) and
2.5kΩon-resistance allow the circuit to sustain 110V
AC faults indefinitely while maintaining an error of less
than 40nV for normal signals (i.e., 1pA times 40kΩ).
The MAX328/MAX329 work equally well with a single
supply of 10V to 30V or dual supplies of ±5V to ±18V.
They also perform well with unbalanced combinations of
supply voltage, such as +12V and -5V or +5V and -15V.
Low power dissipation (1.9mW with ±15V supplies)
allows use in portable applications.
Applications
Control Systems
Data Logging Systems
Aircraft Heads-Up Displays
Data-Acquisition Systems
Signal Routing
Features
oUltra-Low Off- and On-Leakage: 1pA Typ
oBidirectional Operation (Use as Mux or Demux)
oTTL and CMOS Logic Compatibility
oAnalog-Signal Range Includes Power-Supply Rails
oSwitching Speeds Less Than 1.5µs
oPin Compatible with DG508/DG509 and
MAX358/MAX359
oLatchup Proof Construction
MAX328/MAX329
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
________________________________________________________________
Maxim Integrated Products
1
+
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
A0 A1
A2
GND
V+
S5
S6
S7
S8
TOP VIEW
MAX328
DIP/SO
EN
V-
S3
S1
S2
S4
D
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
A0 A1
GND
V+
S1B
S2B
S3B
S4B
DB
MAX329
DIP/SO
EN
V-
S3A
S1A
S2A
S4A
DA
+
Pin Configurations
Ordering Information
MAX328
V+ V-GND
A0 A1 A2 EN
S1
S8
D
OP
AMP
+15V -15V
40kΩ
1/2W
40kΩ
1/2W
ANALOG
INPUT
ANALOG
INPUT
DM7493
+15V
+15V
N.C.
CLK IN
N.C.
GNDV02
V01
AIN
BIN
QB
QC
QO
QA
V+
EN IN
(MUX ON/OFF CONTROL)
OUT
i BIAS < 1pA
1-OF-8 CHANNEL SEQUENTIAL MUX WITH 120V AC FAULT CAPABILITY
Typical Operating Circuit
19-1006; Rev 3; 2/11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
Contact factory for dice specifications.
**
EP = Exposed pad.
***
Contact factory for availability. Substrate may be allowed to
be unconnected or be connected to V+.
Ordering Information continued at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX328CPE+ 0°C to +70°C 16 Plastic DIP
MAX328CWE+ 0°C to +70°C 16 Wide SO
MAX328CJE 0°C to +70°C 16 CERDIP
MAX328C/D 0°C to +70°C Dice*
MAX328ETE+ -40°C to +85°C 16 TQFN-EP**
MAX328EPE+ -40°C to +85°C 16 Plastic DIP
MAX328EWE+ -40°C to +85°C 16 Wide SO
MAX328EJE -40°C to +85°C 16 CERDIP***
MAX328MJE -55°C to +125°C 16 CERDIP***
Pin Configurations continued at end of data sheet.
MAX328/MAX329
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = 15V, V- = -15V, VGND = 0V, TA= +25°C, 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 (Note 1), VS, VD............................-2V to (V+ + 2V)
Current (Any Terminal, Except S or D)................................30mA
Continuous Current, S or D
(pulsed at 1ms, 10% duty cycle max)..............................40mA
Operating Temperature Range
MAX328/329 C _ _................................................0°C to +70°C
MAX328/329 E _ _.............................................-40°C to +85°C
MAX328/329 M _ _ ..........................................-55°C to +125°C
Power Dissipation (Package) (Note 1)
CERDIP (derate 10mW/°C above +70°C) .....................800mW
PDIP (derate 10.5mW/°C above +70°C) ....................842.1mW
Wide SO (derate 14.3mW/°C above +70°C) ............1142.9mW
TQFN (derate 33.3mW/°C above +70°C) .................2666.7mw
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
Lead(Pb)-free packages (PDIP, TQFN, Wide SO) ........+260°C
Packages containing lead(Pb) (CERDIP, PDIP, Wide SO)..+240°C
Packages containing lead(Pb) (TQFN) .........................+260°C
MAX328M
MAX329M
MAX328C/E
MAX329C/E
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX MIN TYP MAX
UNITS
SWITCH
Analog Signal Range VANALOG -15 +15 -15 +15 V
VD = 10V,
IS = 100µA 1.5 2.5 1.5 3.5
Drain-Source
On-Resistance RDS(ON) VD = -10V,
IS = 100µA
Seq. each
switch on,
VAL = 0.8V,
VAH = 2.4V 1.0 2.5 1.0 3.5
k
Greatest Change in
Drain-Source On-
Resistance Between
Channels
RDS(ON)
RDS(ON) =
RDS(ON) Max - RDS(ON) Min
( )
RDS(ON) Ave
2 2 %
VS = 10V, VD = -10V 0.1 ±10 0.1 ±10
Source Off-Leakage
Current (Note 3) IS(OFF) VS = -10V, VD = 10V VEN = 0V 0.3 ±10 0.3 ±10
pA
VD = 10V, VS = -10V 0.3 ±10 0.3 ±10
MAX328 VD = -10V, VS = 10V 1.0 ±10 1.0 ±10
VD = 10V, VS = -10V 0.3 ±10 0.3 ±10
Drain Off-
Leakage
Current
(Note 3) MAX329
ID(OFF)
VD = -10V, VS = 10V
VEN = 0V
0.5 ±10 0.5 ±10
pA
VS (all) = VD = 10V 3.0 ±10 3.0 ±10
MAX328 VS (all) = VD = -10V 2.0 ±10 2.0 ±10
VS (all) = VD = 10V 1.5 ±10 1.5 ±10
Drain On-
Leakage
Current
(Note 3) MAX329
ID(ON)
VS (all) = VD = -10V
Seq. each
switch on,
VAL = 0.8V,
VAH = 2.4V 1.0 ±10 1.0 ±10
pA
Note 1: All leads soldered or welded to PC board.
MAX328/MAX329
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, V- = -15V, VGND = 0V, TA= +25°C, unless otherwise noted.) (Note 2)
MAX328M
MAX329M
MAX328C/E
MAX329C/E
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX MIN TYP MAX
UNITS
INPUT
VA = 2.4V 0.001 ±1 0.001 ±1
Address Input Current,
Input Voltage High IAH VA = 15V 0.001 ±1 0.001 ±1 µA
VEN = 2.4V 0.001 ±1 0.001 ±1
Address Input Current,
Input Voltage Low IAL VEN = 0V
All
VA = 0V 0.001 ±1 0.001 ±1 µA
DYNAMIC
Switching Time of
Multiplexer tTRANSITION Figure 1 1.0 1.5 µs
Break-Before-Make
Interval tOPEN Figure 2 0.2 0.2 µs
Enable Turn-On Time tON(EN) Figure 3 1.0 1.5 µs
Enable Turn-Off Time tOFF(EN) Figure 3 0.7 1.0 µs
Off-Isolation OIRR
VEN = 0V, RL = 1k, CL = 15pF,
VS = 7VRMS, f = 500kHz 84 84 dB
Source Off-Capacitance CS(OFF) V
S = 0V VEN = 0V,
f = 1MHz 1.8 1.8 pF
MAX328 8.0 8.0
Drain Off-
Capacitance MAX329 CD(OFF) V
D = 0V VEN = 0V,
f = 1MHz 4.0 4.0 pF
VA = 10V 1 1
VA = 0V 2 5 2 5
Charge Injection
(Note 4) Q(INJ)
VA = -10V 4 4
pc
SUPPLY
Positive Supply Current I+ VEN = 2.4V VA = 0V/5V 4.5 200 4.5 200 µA
Negative Supply Current I- VEN = 2.4V VA = 0V/5V 1 -100 1 -100 µA
Power-Supply Range for
Continuous Operation
(Note 7)
VOP ±5 ±18 ±5 ±18 V
MAX328/MAX329
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (Overtemperature)
(V+ = 15V, V- = -15V, VGND = 0V, TA= TMIN to TMAX, unless otherwise noted.) (Note 2)
MAX328M
MAX329M
MAX328C/E
MAX329C/E
PARAMETER SYMBOL TEST CONDITIONS
MIN TYP MAX MIN TYP MAX
UNITS
SWITCH
Analog-Signal Range VANALOG -15 +15 -15 +15 V
VD = 10V,
IS = 100µA 2.2 4 1.9 5
Drain-Source
On-Resistance RDS(ON) VD = -10V,
IS = 100µA
Seq. each
switch on,
VAL = 0.8V,
VAH = 2.4V 1.5 4 1.2 5
k
VS = 10V, VD = -10V ±5 ±5
Source Off-Leakage
Current (Note 6) IS(OFF) VS = -10V, VD = 10V VEN = 0V ±5 ±5
nA
VD = 10V, VS = -10V ±20 ±20
MAX328 VD = -10V, VS = 10V ±20 ±20
VD = 10V, VS = -10V ±10 ±10
Drain Off-
Leakage
Current
(Note 6) MAX329
ID(OFF)
VD = -10V, VS = 10V
VEN = 0V
±10 ±10
nA
VS (all) = VD = 10V ±20 ±20
MAX328 VS (all) = VD = -10V ±20 ±20
VS (all) = VD = 10V ±10 ±10
Drain On-
Leakage
Current
(Note 6) MAX329
ID(ON)
VS (all) = VD = -10V
Seq. each
switch on,
VAL = 0.8V,
VAH = 2.4V ±10 ±10
nA
INPUT
VA = 2.4V 0.01 ±1 0.01 ±1
Address Input Current,
Input Voltage High IAH VA = 15V 0.01 ±1 0.01 ±1 µA
VEN = 2.4V 0.01 ±1 0.01 ±1
Address Input Current,
Input Voltage Low IAL VEN = 0V
All
VA = 0V 0.01 ±1 0.01 ±1 µA
Note 2: Typical values are for design aid only; not guaranteed or subject to production testing.
Note 3: All leakage parameters are 100% tested at maximum rated operating temperature, i.e., +70°C, +85°C, +125°C, and guaran-
teed by correlation at +25°C.
Note 4: Guaranteed by design.
Note 5: Electrical characteristics, such as On-Resistance, change when power supplies other than ±15V are used. Power-supply
range is a design characteristic, not production tested.
Note 6: Leakage parameters are 100% tested at maximum rated operating temperature, i.e., +70°C, etc.
MAX328/MAX329
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
_______________________________________________________________________________________
5
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
RDS(ON) vs. ANALOG INPUT
FOR DUAL SUPPLIES
MAX328/MAX329 toc01
ANALOG INPUT (V)
RDS(ON) (kΩ)
1050-5-10
1
2
3
4
5
6
7
8
9
0
-15 15
±5V SUPPLIES
±15V SUPPLIES
RDS(ON) vs. ANALOG INPUT
FOR SINGLE SUPPLY
MAX328/MAX329 toc02
ANALOG INPUT (V)
RDS(ON) (kΩ)
105
1
2
3
4
5
0
015
WITH +15V SUPPLY
IS(OFF) vs. TEMPERATURE
MAX328/MAX329 toc03
TEMPERATURE (°C)
LEAKAGE (nA)
105856545255-15-35
0.001
0.01
0.1
1.0
10.0
0.0001
-55 125
V+ = 15V
V- = 15V
MAX328/
MAX329
ID(ON), ID(OFF) vs. TEMPERATURE
MAX328/MAX329 toc04
TEMPERATURE (°C)
LEAKAGE (nA)
105856545255-15-35
0.01
0.1
1.0
10
100
0.001
-55 125
V+ = 15V
V- = 15V
MAX328
MAX328/MAX329
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
6 _______________________________________________________________________________________
PIN
MAX328 MAX329
DIP/SO TQFN-EP DIP/SO TQFN-EP
NAME FUNCTION
1, 15, 16 15, 14, 13 — — A0, A2, A1 Address Input
— — 1, 16 15, 14 A0, A1 Address Input
2 16 2 16 EN Enable
3 1 3 1 V- Negative-Supply Voltage Input
4–7 2–5 — — S1–S4 Analog Inputs—Bidirectional
— — 4–7 2–5 S1A–S4A Analog Inputs—Bidirectional
8 6 — — D Analog Outputs—Bidirectional
— — 8, 9 6, 7 DA, DB Analog Outputs—Bidirectional
9–12 7–10 — — S8–S5 Analog Inputs—Bidirectional
— — 10–13 8–11 S4B–S1B Analog Inputs—Bidirectional
13 11 14 12 V+ Positive-Supply Voltage Input
14 12 15 13 GND Ground
— — — — EP Exposed pad. Connect EP to V+. (TQFN only).
Pin Description
Truth Table—MAX328
A2 A1 A0 EN
ON
SWITCH
X X X 0 None
0 0 0 1 1
0 0 1 1 2
0 1 0 1 3
0 1 1 1 4
1 0 0 1 5
1 0 1 1 6
1 1 0 1 7
1 1 1 1 8
Truth Table—MAX329
A1 A0 EN
ON
SWITCH
X X 0 None
0 0 1 1
0 1 1 2
1 0 1 3
1 1 1 4
Note: Logic “0” = VAL ≤0.8V, Logic “1” = VAH ≥2.4V
MAX328/MAX329
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
_______________________________________________________________________________________ 7
MAX328
A2 +5V
S1
A1
EN
2.4V
VOUT
VA
OUT
S8
A0
S2–S7
GND
1kΩ
50Ω
12.5pF
0V
VAH = 3.0V
tOPEN
50%50%
OUTPUT
ADDRESS
DRIVE (VA)
Figure 2. Break-Before-Make Delay (tOPEN)
MAX328
A2 S1
A1
EN
VA
OUT
A0
S2–S7
GND
1kΩ
50Ω
12.5pF
+10V
50%
90%
90%
tOFF(EN)
tON(EN)
OUTPUT
ENABLE DRIVE
VAH = 3.0V
0V
Figure 3. Enable Delay (tON(EN), tOFF(EN))
MAX328
A2 ±10V
-10V
0V
+10V
50%
90%
10V
±
S1
A1
S2
EN
+VAH
VAH = 3.0V
OUTPUT A
VA
tA
OUT
S8
A0
S2–S7
GND
10MΩ
50ΩPROBE
14pF
ADDRESS
DRIVE (VA)
Figure 1. Access Time vs. Logic Level (High)
MAX328/MAX329
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
8 _______________________________________________________________________________________
Applications Information
Figure 4 is a typical circuit for converting the
MAX328/MAX329 into a fault-tolerant mux. In this
application, the internal diodes limit the voltage at the
MAX328 input to ±15.7V (±15V supplies). No external
diodes need to be added with the MAX328/MAX329,
unlike conventional multiplexers requiring external
diodes.
The resistors, R, need to be 39kΩor higher to limit the
power dissipation in the resistor when a 120V AC fault
occurs (i.e., power dissipation is (120-16)2/39kΩor
0.28W. This is why a 1/2/W resistor is needed). The circuit
withstands an indefinite fault to a 120V AC line with no
damage to any component.
In addition to allowing fault-protection, the guaranteed
low leakage of the MAX328/MAX329 also reduces signal
errors. The circuit in Figure 4 produces an error voltage of
10pA (max leakage) x 39kΩor 0.39µV at room tempera-
ture and 39µV at +125°C. Therefore, for 10V signals, the
MAX328/MAX329 allows 17-bit resolution (38µV = 1LSB)
over the full temperature range.
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
A0 A1
A2
MAX328
EN
D
S4
S3
S2
S1
1µF
-15V
R
R
R
R
R
R
R
R
S5
S6
S7
S8
1µF
+15V
R = 39kΩ 1/2W
Figure 4. Fault-Tolerant Mux (indefinitely withstands 120V AC
fault voltages)
16 EN
15 A0
14 A1
13 A2
10 S5
11 V+
12 GND
9S6
2S1
1V-
3S2
4S3
5S4
6D
7
S8
8S7
MAX328
LOGIC
16 EN
15 A0
14 A1
13 GND
10 S2B
11 S1B
12 V+
9 S3B
2S1A
1V-
3S2A
4S3A
5S4A
6DA
7
DB
8S4B
MAX329
LOGIC
TOP VIEW
Functional Diagrams
MAX328/MAX329
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
_______________________________________________________________________________________ 9
Ordering Information (continued)
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
Contact factory for dice specifications.
**
EP = Exposed pad.
***
Contact factory for availability. Substrate may be allowed to
be unconnected or be connected to V+.
PART TEMP RANGE PIN-PACKAGE
MAX329CPE+ 0°C to +70°C 16 Plastic DIP
MAX329CWE+ 0°C to +70°C 16 Wide SO
MAX329CJE 0°C to +70°C 16 CERDIP
MAX329C/D 0°C to +70°C Dice*
MAX329ETE+ -40°C to +85°C 16 TQFN-EP**
MAX329EPE+ -40°C to +85°C 16 Plastic DIP
MAX329EWE+ -40°C to +85°C 16 Wide SO
MAX329EJE -40°C to +85°C 16 CERDIP***
MAX329MJE -55°C to +125°C 16 CERDIP***
16
EN
15A0
14A1
13
A2
10 S5
11 V+
12 GND
9S6
2S1
1V-
3S2
4S3
5S4
+
6D
7S8
8S7
MAX328
TOP VIEW
TQFN
16
EN
15A0
14A1
13
GND
10 S2B
11 S1B
12 V+
9 S3B
2S1A
1V-
3S2A
4S3A
5S4A
+
6DA
7DB
8 S4B
MAX329
TOP VIEW
TQFN
Pin Configurations (continued)
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
16 CERDIP J16+3 21-0045 —
16 PDIP P16+2 21-0043 —
16 TQFN-EP T1655+3 21-0140 90-0073
16 Wide SO W16+2 21-0042 90-0107
MAX328/MAX329
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
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.
10
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
3 2/11
Updated the Ordering Information table to reflect lead-free parts and corrected part
numbers and package types 1, 9
