MAXIM MAX328, MA329 Technical data

General Description

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

Control Systems

Data Logging Systems

Aircraft Heads-Up Displays

Data-Acquisition Systems

Signal Routing

Features

♦ Ultra-Low Off- and On-Leakage: 1pA Typ

♦ Bidirectional Operation (Use as Mux or Demux)

♦ TTL and CMOS Logic Compatibility

♦ Analog Signal Range Includes Power-Supply Rails

♦ Switching Speeds Less Than 1.5µs

♦ Pin Compatible with DG508/DG509 and

MAX358/MAX359

♦ Latchup Proof Construction

MAX328/MAX329

Ultra-Low Leakage Monolithic CMOS

Analog Multiplexers

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

Ordering Information

MAX328

V+ V-GND

A

0A1A2

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.

GNDV

02V01

AIN

BIN

Q

B

Q

C

Q

O

Q

A

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 2; 9/01

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

*Contact factory for dice specifications.
**Contact factory for availability. Substrate may be allowed to

float or be connected to V+.

Ordering Information and Pin Configurations 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*

MAX328EGE -40°C to +85°C 16 QFN

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**

TOP VIEW

A0

1

2

EN

V-

3

MAX328

4

S1

S2

5

S3

6

S4

7

D

8

A0

1

EN

2

V-

3

MAX329

4

S1A

S2A

5

S3A

6

S4A

7

DA

8

DIP/SO

DIP/SO

16

A1

15

A2

14

GND

13

V+

12

S5

S6

11

10

S7

9

S8

16

A1

15

GND

14

V+

13

S1B

12

S2B

S3B

11

10

S4B

9

DB

MAX328/MAX329

Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = +15V, V- = -15V, GND = 0V, TA= +25°C, unless otherwise noted.)

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), V

S

, 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)

16-Pin CERDIP (Note 2) ...............................................900mW

16-Pin Plastic DIP (Note 3)...........................................470mW

16-Pin Wide SO (Note 4) ..............................................750mW

16-Pin QFN (Note 5) ...................................................1538mw

Storage Temperature.........................................-65°C to +150°C

)

)

Note 1: All leads soldered or welded to PC board.
Note 2: Derate 12mW/°C above +75°C.
Note 3: Derate 6.3mW/°C above +75°C.
Note 4: Derate 10mW/°C above +75°C.
Note 5: Derate 19.2mW/°C above +75°C.

PARAMETER SYMBOL TEST CONDITIONS

SWITCH

Analog Signal Range V

Drain-Source
On-Resistance

Greatest Change in
Drain-Source On­Resistance Between
Channels

Source Off-Leakage
Current (Note 6)

Drain Off­Leakage
Current (Note 6)

Drain On­Leakage
Current (Note 6)

MAX328

MAX329

MAX328

MAX329

ANALOG

R

DS(ON

∆R

DS(ON

I

S(OFF)

I

D(OFF)

I

D(ON)

VD = 10V,

= 100µA

I

S

VD = -10V,

= 100µA

I

S

R

=

DS(on)

R
(
R

VS = 10V, VD = -10V 0.1 ±10 0.1 ±10

VS = -10V, VD = 10V

VD = 10V, VS = -10V 0.3 ±10 0.3 ±10

V

D

VD = 10V, VS = -10V 0.3 ±10 0.3 ±10

VD = -10V, VS = 10V

VS (all) = VD = 10V 3.0 ±10 3.0 ±10

V

S

VS (all) = VD = 10V 1.5 ±10 1.5 ±10

VS (all) = VD = -10V

Max - R

DS(ON)

= -10V, VS = 10V 1.0 ±10 1.0 ±10

(all) = VD = -10V 2.0 ±10 2.0 ±10

DS(ON)

DS(ON)

Ave

LIMITS

Seq. each
switch on,

= 0.8V,

V

AL

= 2.4V

V

AH

Min

)

= 0V

V

EN

V

= 0V

EN

Seq. each
switch on,

= 0.8V,

V

AL

V

= 2.4V

AH

MAX328M
MAX329M

MIN TYP MAX MIN TYP MAX

±15 ±15 V

1.5 2.5 1.5 3.5

1.0 2.5 1.0 3.5

22%

0.3 ±10 0.3 ±10

0.5 ±10 0.5 ±10

1.0 ±10 1.0 ±10

MAX328C/E
MAX329C/E

UNITS

kΩ

pA

pA

pA

MAX328/MAX329

Ultra-Low Leakage Monolithic CMOS

Analog Multiplexers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +15V, V- = -15V, GND = 0V, TA= +25°C, unless otherwise noted.)

)

)

)

)

Note 6: 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 7: 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 8: Guaranteed by design.

Typical values are for DESIGN AID ONLY, not guaranteed or subject to production testing.

PARAMETER SYMBOL TEST CONDITIONS

INPUT

Address Input Current,
Input Voltage High

Address Input Current,
Input Voltage Low

DYNAMIC

Switching Time of
Multiplexer

Break-Before-Make
Interval

Enable Turn-On Time t

Enable Turn-Off Time t

Off-Isolation OIRR

Source Off-Capacitance C

Drain Off­Capacitance

Charge Injection (Note 8)

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)

MAX328 8.0 8.0

MAX329

I

AH

I

AL

t

TRANSITION

t

OPEN

ON(EN

OFF(EN

S(OFF

C

D(OFF

Q

(INJ)

V

OP

VA = 2.4V 0.001 ±1 0.001 ±1

VA = 15V 0.001 ±1 0.001 ±1

VEN = 2.4V 0.001 ±1 0.001 ±1

VEN = 0V

See Figure 1 1.0 1.5 µs

See Figure 2 0.2 0.2 µs

See Figure 3 1.0 1.5 µs

See Figure 3 0.7 1.0 µs

V

= 0V, RL = 1kΩ, CL = 15pF,

EN

V

= 7V

S

VS = 0V

VD = 0V

VA = +10V 1 1

VA = 0V 2 5 2 5

VA = -10V 4 4

, f = 500kHz

RMS

All
V

= 0V

A

V

= 0V,

EN

f = 1MHz

V

= 0V,

EN

f = 1MHz

MAX328M
MAX329M

MIN TYP MAX MIN TYP MAX

0.001 ±1 0.001 ±1

84 84 dB

1.8 1.8 pF

4.0 4.0

±5 ±18 ±5 ±18 V

LIMITS

MAX328C/E
MAX329C/E

UNITS

µA

µA

pF

pc

MAX328/MAX329

Ultra-Low Leakage Monolithic CMOS
Analog Multiplexers

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (Over Temperature)

(V+ = +15V, V- = -15V, GND = 0V, TA= T

MIN

to T

MAX

, unless otherwise noted.)

)

Note 9: Leakage parameters are 100% tested at maximum rated operating temperature, i.e., +70°C, etc.

PARAMETER SYMBOL TEST CONDITIONS

SWITCH

Analog Signal Range V

Drain-Source
On-Resistance

Source Off­Leakage Current (Note 9)

Drain Off­Leakage
Current (Note 9)

Drain On­Leakage
Current (Note 9)

INPUT

Address Input Current,
Input Voltage High

Address Input Current,
Input Voltage Low

MAX328

MAX329

MAX328

MAX329

ANALOG

R

DS(ON

I

S(OFF)

I

D(OFF)

I

D(ON)

I

AH

I

AL

VD = 10V,

= 100µA

I

S

VD = -10V,

= 100µA

I

S

VS = 10V, VD = -10V ±5 ±5

VS = -10V, VD = 10V

VD = 10V, VS = -10V ±20 ±20

= -10V, VS = 10V ±20 ±20

V

D

VD = 10V, VS = -10V ±10 ±10

VD = -10V, VS = 10V

VS (all) = VD = 10V ±20 ±20

(all) = VD = -10V ±20 ±20

V

S

VS (all) = VD = 10V ±10 ±10

VS (all) = VD = -10V

VA = 2.4V 0.01 ±1 0.01 ±1

VA = 15V 0.01 ±1 0.01 ±1

VEN = 2.4V 0.01 ±1 0.01 ±1

VEN = 0V

Seq. each
switch on,
V

AL

V

AH

V

EN

V

EN

Seq. each
switch on,
V

AL

V

AH

All
V

= 0V

A

= 0.8V,

= 2.4V

= 0V

= 0V

= 0.8V,

= 2.4V

MAX328M
MAX329M

MIN TYP MAX MIN TYP MAX

±15 ±15 V

2.2 4 1.9 5

1.5 4 1.2 5

0.01 ±1 0.01 ±1

LIMITS

MAX328C/E
MAX329C/E

±5 ±5

±10 ±10

±10 ±10

UNITS

kΩ

nA

nA

nA

µA

µA

MAX328/MAX329

Ultra-Low Leakage Monolithic CMOS

Analog Multiplexers

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

R

DS(ON)

vs. ANALOG INPUT

FOR DUAL SUPPLIES

MAX328/MAX329 toc01

ANALOG INPUT (V)

R

DS(ON)

(kΩ)

1050-5-10

1

2

3

4

5

6

7

8

9

0

-15 15

±5V SUPPLIES

±15V SUPPLIES

R

DS(ON)

vs. ANALOG INPUT

FOR SINGLE SUPPLY

MAX328/MAX329 toc02

ANALOG INPUT (V)

R

DS(ON)

(kΩ)

105

1

2

3

4

5

0

015

WITH +15V SUPPLY

I

S(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

I

D(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 Description

Truth Table—MAX328

Truth Table—MAX329

Note: Logic “0” = VAL≤ 0.8V, Logic “1” = VAH≥ 2.4V

PIN

MAX328 MAX329

DIP/SO QFN DIP/SO QFN

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

4–72–5 ——S1–S4 Analog Inputs—Bidirectional

——4–72–5 S1A–S4A Analog Inputs—Bidirectional

86—— 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

A

2

X X X 0 None

00001

00112

01013

01114

10015

10116

11017

11118

A

1

A

0

EN

SWITCH

NAME FUNCTION

ON

A

1

X X 0 None

0011

0112

1013

1114

A

0

EN

ON

SWITCH

MAX328/MAX329

Ultra-Low Leakage Monolithic CMOS

Analog Multiplexers

_______________________________________________________________________________________ 7

Figure 2. Break-Before-Make Delay (t

OPEN

)

Figure 3. Enable Delay (t

ON(EN)

, t

OFF(EN)

)

Figure 1. Access Time vs. Logic Level (High)

VAH = 3.0V

50%

+10V

90%

t

A

V

0V

AH

ADDRESS
DRIVE (V

OUTPUT A

-10V

= 3.0V

ADDRESS
DRIVE (V

OUTPUT

50%50%

1kΩ

±10V

±

10V

10MΩ

PROBE

14pF

12.5pF

+5V

V

OUT

A

2

)

A

0V

V

A

50Ω

+V

V

)

A

A

50Ω

2.4V

A

1

A

0

EN

AH

A

2

A

1

A

0

EN

MAX328

GND

MAX328

GND

S2–S

S2–S

OUT

OUT

S

S

S

1

S

2
7

S

8

1

7

8

t

OPEN

V

= 3.0V

AH

50%

90%

t

ON(EN)

ENABLE DRIVE

t

OFF(EN)

0V

OUTPUT

90%

1kΩ

+10V

12.5pF

A

2

A

1

A

0

EN

V

A

50Ω

MAX328

GND

S2–S

OUT

S

1

7

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 39kΩ or higher to limit the
power dissipation in the resistor when a 120V AC fault
occurs (i.e., power dissipation is (120-16)2/39kΩ or

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 39kΩ or 0.39µV at room tempera­ture and 39µV at +125°C. Therefore, for 10V signals, the
MAX328/MAX329 allows 17-bit resolution (38µV = 1LSB)
over the full temperature range.

S8 D

98

10

11

12

13

14

S7

S6

S5

V+

GND

7

6

5

4

3

S4

S3

S2

S1

V-

15 16 1 2

A2 A1 A0 EN

0.104”

(2.64mm)

0.118”

(2.90mm)

0.104”

(2.64mm)

0.118”

(2.90mm)

ENA0A1

2116

7

6

5

4

3

S4A

S3A

S2A

S1A

V-

DB DA

98

10

11

12

13

14

15

S4B

S3B

S2B

S1B

V+

GND

MAX328

MAX329

Chip Topographies

Figure 4. Fault-Tolerant MUX (indefinitely withstands 120V AC

fault voltages)

A

0

1

EN

2

16

A

1

A

15

2

-15V
1µF

S

1

S

2

S

3

S

4

R = 39kΩ 1/2W

R

R

R

R

V

OUT

3

MAX328
MAX329

4

5

6

7

8

14

13

12

11

10

9

1µF

R

R

R

R

+15V

S

5

S

6

S

7

S

8

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.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9

© 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

Ordering Information (continued)

*Contact factory for dice specifications.
**Contact factory for availability. Substrate may be allowed to

float or be connected to V+.

Pin Configurations (continued)

Package Information

For the latest package outline information, go to

www.maxim-ic.com/packages

.

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*

MAX329EGE -40°C to +85°C 16 QFN

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**

TOP VIEW

16 EN

15 A0

14 A1

13 A2

1V-

2S1

3S2

4S3

1V-

2S1A

3S2A

4S3A

5S4

16 EN

5S4A

LOGIC

6D

MAX328

15 A0

LOGIC

6DA

7S88S7

14 A1

13 GND

7DB8S4B

12 GND

11 V+

10 S5

9S6

12 V+

11 S1B

10 S2B

9 S3B

MAX329