19-1006; Rev 3; 2/11
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
8/MAX329
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.
Features
o Ultra-Low Off- and On-Leakage: 1pA Typ
o Bidirectional Operation (Use as Mux or Demux)
o TTL and CMOS Logic Compatibility
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.
o Analog-Signal Range Includes Power-Supply Rails
o Switching Speeds Less Than 1.5µs
o Pin Compatible with DG508/DG509 and
MAX358/MAX359
o Latchup Proof Construction
Adding an external 40kΩ resistor to each input makes
the MAX328/MAX329 an excellent fault-tolerant multi-
plexer. Low leakage (less than 1pA at +25°C) and
2.5kΩ on-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.
Ordering Information
PART
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
16 Plastic DIP
16 Wide SO
16 CERDIP
MAX328CPE+
MAX328CWE+
MAX328CJE
MAX328C/D
MAX328ETE+
MAX328EPE+
MAX328EWE+
MAX328EJE
MAX328MJE
Dice*
16 TQFN-EP**
16 Plastic DIP
16 Wide SO
16 CERDIP***
16 CERDIP***
Applications
Control Systems
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Contact factory for dice specifications.
Data Logging Systems
Aircraft Heads-Up Displays
Data-Acquisition Systems
Signal Routing
**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.
Typical Operating Circuit
Pin Configurations
1-OF-8 CHANNEL SEQUENTIAL MUX WITH 120V AC FAULT CAPABILITY
+15V
V+
-15V
V-
TOP VIEW
GND
40kΩ
1/2W
ANALOG
INPUT
+
OP
AMP
+
S1
OUT
A0
A0
1
2
3
4
5
6
7
8
16 A1
15 A2
14 GND
13 V+
12 S5
11 S6
10 S7
1
2
3
4
5
6
7
8
16 A1
MAX328
D
40kΩ
1/2W
EN
V-
S1
S2
S3
S4
D
EN
V-
15 GND
14 V+
ANALOG
INPUT
i BIAS < 1pA
S8
A0 A1 A2 EN
+15V
V+
MAX328
S1A
S2A
S3A
S4A
DA
MAX329
13 S1B
12 S2B
11 S3B
10 S4B
Q
B
CLK IN
N.C.
BIN
AIN
Q
Q
C
O
DM7493
9
S8
9
DB
Q
N.C.
A
V
V
02
GND
01
DIP/SO
DIP/SO
+15V
EN IN
(MUX ON/OFF CONTROL)
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
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.
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