19-1006; Rev 3; 2/11
Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers
The MAX328/MA329 are monolithic CMOS analog multiplexers. 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 offleakages, 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 40kΩ resistor to each input makes
the MAX328/MAX329 an excellent fault-tolerant multiplexer. 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.
Applications
Features
o Ultra-Low Off- and On-Leakage: 1pA Typ
o Bidirectional Operation (Use as Mux or Demux)
o TTL and CMOS Logic Compatibility
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
Ordering Information
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***
+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.
Control Systems
Data Logging Systems
Aircraft Heads-Up Displays
Data-Acquisition Systems
Signal Routing
Typical Operating Circuit
Pin Configurations
1-OF-8 CHANNEL SEQUENTIAL MUX WITH 120V AC FAULT CAPABILITY
+15V
40kΩ
1/2W
ANALOG
INPUT
V+
-15V
GND
+15V
OP
AMP
S1
MAX328
40kΩ
1/2W
ANALOG
INPUT
i BIAS < 1pA
V+
A1
A2
EN
OUT
A0 1
+
16 A1
A0 1
EN 2
D
S8
A0
TOP VIEW
V-
15 A2
EN 2
V- 3
14 GND
+
V- 3
S1 4
MAX328
13 V+
S1A 4
16 A1
15 GND
14 V+
MAX329
13 S1B
QB
CLK IN
N.C.
BIN
AIN
12 S5
S2A 5
12 S2B
QC
S3 6
11 S6
S3A 6
11 S3B
QO
DM7493
S2 5
S4 7
10 S7
S4A 7
10 S4B
QA
V01
V02
N.C.
D 8
9
S8
DA 8
9
DB
GND
DIP/SO
DIP/SO
+15V
EN IN
Pin Configurations continued at end of data sheet.
(MUX ON/OFF CONTROL)
________________________________________________________________ Maxim Integrated Products
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.
1
MAX328/MAX329
General Description
