Datasheet MAX4509MJE, MAX4509ESE, MAX4509EPE, MAX4509EAE, MAX4509CSE Datasheet (Maxim)

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General Description

The MAX4508/MAX4509 are 8-to-1 and dual 4-to-1 fault­protected multiplexers that are pin-compatible with the
industry-standard DG508/DG509. The MAX4508/
MAX4509 operate with dual supplies of ±4.5V to ±20V or
a single supply of +9V to +36V. These multiplexers fea­ture fault-protected inputs, Rail-to-Rail®signal handling
capability, and overvoltage clamping at 150mV beyond
the rails.

Both parts offer ±40V overvoltage protection with sup­plies off and ±25V protection with supplies on. On­resistance is 400Ω max and is matched between
channels to 15Ωmax. All digital inputs have TTL logic
thresholds, ensuring both TTL and CMOS logic com­patibility when using a single +12V supply or dual ±15V
supplies.

Applications

Data-Acquisition Systems
Industrial and Process Control
Avionics
Signal Routing
Redundant/Backup Systems

Features

♦ ±40V Fault Protection with Power Off

±25V Fault Protection with ±15V Supplies

♦ Rail-to-Rail Signal Handling
♦ No Power-Supply Sequencing Required
♦ All Channels Off with Power Off
♦ Output Clamped to Appropriate Supply Voltage

During Fault Condition

♦ 1kΩ Output Clamp Resistance During

Overvoltage

♦ 400Ωmax On-Resistance
♦ 20ns Fault-Response Time
♦ ±4.5V to ±20V Dual Supplies

+9V to +36V Single Supply

♦ TTL/CMOS-Compatible Logic Inputs

MAX4508/MAX4509

Fault-Protected, High-Voltage

Single 8-to-1/Dual 4-to-1 Multiplexers

________________________________________________________________

Maxim Integrated Products

1

16
15
14
13
12
11
10

9

1
2
3
4
5
6
7
8

A1
A2
GND
V+

NO1

V-

EN

A0

TOP VIEW

MAX4508

NO5
NO6
NO7
NO8

COM

NO4

NO3

NO2

SSOP/SO/DIP

LOGIC

16
15
14
13
12
11
10

9

1
2
3
4
5
6
7
8

A1
GND
V+
NO1B

NO1A

V-

EN

A0

MAX4509

NO2B
NO3B
NO4B
COMB

COMA

NO4A

NO3A

NO2A

SSOP/SO/DIP

LOGIC

Pin Configurations/Functional Diagrams

19-1414; Rev 0; 1/99

PART

MAX4508CAE

MAX4508CSE
MAX4508CPE 0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 SSOP
16 Narrow SO
16 Plastic DIP

Ordering Information continued at end of data sheet.

*

Contact factory for dice specifications.

**

Contact factory for availability.

Functional Diagrams/Truth Tables appear at end of
data sheet.

Ordering Information

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

MAX4508C/D 0°C to +70°C Dice*
MAX4508EAE -40°C to +85°C 16 SSOP
MAX4508ESE -40°C to +85°C 16 Narrow SO
MAX4508EPE -40°C to +85°C 16 Plastic DIP
MAX4508MJE -55°C to +125°C 16 CERDIP**

MAX4508/MAX4509

Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 Multiplexers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—Dual Supplies

(V+ = +15V, V- = -15V, V

A_

H

=+2.4V, V

A_

L

= +0.8V, VEN= +2.4V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.) (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.

(Voltages Referenced to GND)

V+........................................................................-0.3V to +44.0V

V-.........................................................................-44.0V to +0.3V

V+ to V-................................................................-0.3V to +44.0V

COM_, A_ (Note 1) .............................. (V+ + 0.3V) to (V- - 0.3V)

NO_.........................................................(V+ - 40V) to (V- + 40V)

NO_ to COM_..........................................................-36V to +36V

NO_ Overvoltage with Switch Power On.................-30V to +30V

NO_ Overvoltage with Switch Power Off.................-40V to +40V

Continuous Current into Any Terminal..............................±30mA

Peak Current, Into Any Terminal

(pulsed at 1ms, 10% duty cycle).................................±100mA

Continuous Power Dissipation (T

A

= +70°C)

16 SSOP (derate 8.70mW/°C above +70°C) ................667mW

16 Narrow SO (derate 8.70mW/°C above +70°C) ........471mW

16-Pin Plastic DIP (derate 10.53mW/°C above +70°C) 842mW

16-Pin CERDIP (derate 10.00mW/°C above +70°C).....800mW

Operating Temperature Ranges

MAX4508C_ E/MAX4509C_E...............................0°C to +70°C

MAX4508E_ E/MAX4509E_E ............................-40°C to +85°C

MAX4508MJE/MAX4509MJE..........................-55°C to +125°C

Storage Temperature Range.............................-65°C to +160°C

Lead Temperature (soldering, 10sec).............................+300°C

Note 1: COM_, EN, and A_ pins are not fault protected. Signals on COM_, EN, or A_ exceeding V+ or V- are clamped by internal

diodes. Limit forward diode current to maximum current rating.

-150 150

-15 15

-1 1

COM_ On-Leakage Current
(Note 6)

-300 300

-25 25
nA

-2 2

I

COM_(ON)

-100 100

COM_ Off-Leakage Current
(Note 6)

-10 10

-1 1

-200 200

-20 20
nA

-2 2

I

COM_(OFF)

300 400

R

ON

V

V- V+

V

NO_

Fault-Free Analog Signal Range
(Notes 3, 4)

-50 50

I

NO_(OFF)

NO_ Off-Leakage Current
(Note 6)

-5 5

nA

-0.5 0.5

25

500

Ω

700

On-Resistance

Ω

15

∆R

ON

On-Resistance Match Between
Channels (Note 5)

20

UNITSMIN TYP MAXSYMBOLPARAMETER

V+ = +15V, V- = -15V,
V

NO_

= ±15V

V

COM_

= ±10V,

V

NO_

= ±10V or

floating

V

NO_

= ±10V, V

COM_

= –+10V

V

COM_

= ±10V, I

NO_

= 0.2mA

V

COM_

= ±10V, I

NO_

= 0.2mA

V

COM_

= ±10V,

V

NO_

= –+10V,

CONDITIONS

M

C, E

+25°C

+25°C

M

C, E, M

C, E

+25°C

M

C, E

M

C, E

+25°C

M

+25°C

M

C, E

M

+25°C

C, E

C, E

+25°C

T

A

MAX4508

MAX4509

MAX4508

MAX4509

ANALOG SWITCH

MAX4508/MAX4509

Fault-Protected, High-Voltage

Single 8-to-1/Dual 4-to-1 Multiplexers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS--Dual Supplies (continued)

(V+ = +15V, V- = -15V, V

A_

H

= +2.4V, V

A_

L

= +0.8V, VEN= +2.4V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.) (Note 2)

V

NO_

= ±25VR

COM_

ns

600

ns

Enable Turn-On Time

120 200

M

Transition Time

+25°C

500

170 350

t

TRANS

Figure 2

C, E, M

+25°C

V

NO_

= ±10V, RL = 1kΩ,

Figures 2 and 3

nst

OFF

Enable Turn-Off Time 250C, E

10 80C, E, M

V

NO_

= ±10V, RL = 1kΩ,

Figure 4

ns

400M

t

BBM

Break-Before-Make Time Delay
(Note 4)

UNITSMIN TYP MAXSYMBOLPARAMETER CONDITIONS TA

400

160 275

t

ON

µA-1 1I

A_H

, I

A_L

A_ Input Current Logic
High or Low

V0.8V

A_L

A_ Input Logic Threshold Low

V2.4V

A_H

A_ Input Logic Threshold High

µs2.5± Fault Recovery Time (Note 4)

ns20

± Fault Output Clamp Turn-On
Delay (Note 4)

COM_ On Clamp Output
Resistance, Supplies On

kΩ100 1.0 2.5

COM_ On Clamp Output
Current, Supplies On

-13 -11 -7

mA

71013

I

COM_

nA

-10 10

-40 40

V

-25 25

V

NO_

Fault-Protected Analog Signal
Range (Notes 3, 4)

µA

-100 100

nA

-5 5

-20 20

I

NO_

NO_ Input Leakage Current,
Supplies Off

µA-50 50

I

NO_

NO_ Input Leakage Current,
Supplies On

-20 20

µA-100 100

I

COM_

COM_ Output Leakage Current,
Supplies On

nA

-20 20

-200 200

V

NO_

= ±10V, RL= 1kΩ,

Figures 2 and 3

VA_= 0.8V or 2.4V

Applies with power on, Figure 9

RL= 10kΩ, V

NO_

= ±25V

RL = 10kΩ, V

NO_

= ±25V

V

NO_

= ±40V, V

COM

= 0,

V+ = 0, V- = 0

V

NO_

= ±25V, V

COM_

= –+10V,

VEN= 0

V

NO_

= ±25V, VEN= 0

V

COM

= 0

C, E

+25°C

+25°C

C, E, M

C, E, M

C, E, M

+25°C

+25°C

+25°C

M

C, E

+25°C

+25°C

M

C, E

M

+25°C

C, E

+25°C

210+25°C

CL= 1.0nF, V

NO_

= 0, RS= 0,

Figure 5

pCQ

Charge Injection
(Note 4)

-70+25°C

RL= 75Ω, CL= 15pF,
V

NO_

= 1V

RMS

, f = 1MHz, Figure 6

dBV

ISO

Off-Isolation
(Note 7)

SWITCH DYNAMIC CHARACTERISTICS

LOGIC INPUT

FAULT PROTECTION

Applies with power off

V

NO_

= 25V

V

NO_

= -25V

MAX4508/MAX4509

Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 Multiplexers

4 _______________________________________________________________________________________

UNITSMIN TYP MAXSYMBOLPARAMETER CONDITIONS T

A

500

µA

200 300

I

GND

GND Supply Current

µA

370 500

I+V+ Supply Current

±4.5 ±20

pF10

dB-62V

CT

Channel-to-Channel Crosstalk
(Note 8)

19

pF

14

C

N_(OFF)

NO_ Off-Capacitance

RL= 75Ω, CL= 15pF,
V

NO_

= 1V

RMS

, f = 1MHz, Figure 7

All V

A_

= 0 or 5V,

V

NO_

= 0, VEN= 5V

All V

A_

= 0 or 5V,

V

NO_

= 0, VEN= 5V

f = 1MHz, Figure 8

+25° C

C, E, M

+25° C

+25°C

+25°C

+25° C

C

COM_(OFF)

COM_ Off-Capacitance

f = 1MHz, Figure 8C

COM_(ON)

COM_ On-Capacitance

28

pF

22

+25° C

Power-Supply Range V+, V- C, E, M V

600C, E
800M

400C, E
500M

µA

200 300

I-V- Supply Current

All VA_= 0 or 5V,
V

NO_

= 0, VEN= 5V

+25°C

V

0V+

V

NO_

Fault-Free Analog Signal Range
(Note 3)

-200 200

I

NO_(OFF)

NO_ Off-Leakage Current
(Notes 6, 9)

-10 10

nA

-0.5 0.01 0.5

75

Ω

10 25

∆R

ON

On-Resistance Match Between
Channels (Note 5)

50

UNITSMIN TYP MAXSYMBOLPARAMETER

V+ = 12V, V- = 0,
V

NO_

= 12V

V

COM_

= 10V, 1V;

V

NO_

= 1V, 10V

V

COM_

= 10V, I

NO_

= 200µA

CONDITIONS

C, E, M

M

C, E

+25°C

M

+25°C

C, E

T

A

650 950

R

ON

1100

Ω

1300

On-Resistance V

COM_

= +10V, I

NO_

= 200µA

+25°C

C, E

M

ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)

(V+ = +15V, V- = -15V, V

A_

H

= +2.4V, V

A_

L

= +0.8V, VEN= +2.4V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.) (Note 2)

ELECTRICAL CHARACTERISTICS—Single +12V Supply

(V+ = +12V, V- = 0, V

A_

H

= +2.4V, V

A_

L

= +0.8V, VEN= +2.4V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.) (Note 2)

ANALOG SWITCH

POWER SUPPLY

f = 1MHz, Figure 8

MAX4508
MAX4509
MAX4508
MAX4509

µA

MAX4508/MAX4509

Fault-Protected, High-Voltage

Single 8-to-1/Dual 4-to-1 Multiplexers

_______________________________________________________________________________________ 5

MAX4508

MAX4508

V

NO_

= 25V, V+ = 12V

MAX4509

R

COM_

MAX4509

-150 150

-15 15

-1 1

COM_ On-Leakage Current
(Note 6)

-300 300

-25 25

nA

-2 2

I

COM_(ON)

-100 100

COM_ Off-Leakage Current
(Note 6)

-10 10

-1 1

-200 200

-20 20

nA

-2 2

I

COM_(OFF)

UNITSMIN TYP MAXSYMBOLPARAMETER

V

COM_

= 10V, 1V;

V

NO_

= 10V, 1V, or

floating

V

COM_

= 10V, 1V;

V

NO_

= 1V, 10V

CONDITIONS

M

C, E

+25°C

M

C, E

+25°C

M

C, E

+25°C

M

C, E

+25°C

T

A

µA-1 0.03 1

I

INH_

,

I

INL_

A_ Input Current Logic
High or Low

V0.8 1.8V

IN_L

A_ Input Logic Threshold Low

V1.8 2.4V

IN_H

A_ Input Logic Threshold High

COM_ ON Output Resistance,
Supply On

kΩ2.4 6

COM_ ON Output Current,
Supply On

mA235I

COM_

-20 20

V

-25 25

V

NO_

Fault-Protected Analog Signal
Range (Notes 3, 10)

-100 100

nA

-5 5

-20 0.1 20

I

NO_

NO_ Input Leakage Current,
Supply Off (Notes 3, 10)

µA

-100 100

I

NO_

NO_ Input Leakage Current,
Supply On (Notes 3, 10)

-20 20

µA

-100 100

I

COM_

COM_ Output Leakage Current,
Supply On (Notes 3, 10)

-20 20

-5 5

V

IN_

= 0.8V or 2.4V

Applies with all power on

V

NO_

= ±40V, V+ = 0, V- = 0

V

NO_

= ±25V, V

COM_

= 0,

V+ = 12V

V

NO_

= ±25V, V+ = 12V

V

NO_

= 25V, V+ = 12V

+25°C

C, E, M

C, E, M

C, E, M

+25°C

M

C, E

+25°C

+25°C

M

C, E

M

+25°C

C, E

+25°C

nA

ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued)

(V+ = +12V, V- = 0, V

A_

H

= +2.4V, V

A_

L

= +0.8V, VEN= +2.4V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.) (Note 2)

FAULT PROTECTION

LOGIC INPUT

Applies with all power off -40 40

nA

µA

MAX4508/MAX4509

Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 Multiplexers

6 _______________________________________________________________________________________

COM_ On-Capacitance C

COM_(ON)

V

COM_

= V

NO_

= 0, f = 1MHz,

Figure 8

+25°C 28

COM_ Off-Capacitance C

COM_(OFF)

pFV

COM_

= 0, f = 1MHz, Figure 8 +25°C 19

NO_ Off-Capacitance C

NO_(OFF)

pFV

NO_

= 0, f = 1MHz, Figure 8 +25°C 10

+25°C

C, E, M

+25°C

All V

A_

= 0 or 5V,

V

NO_

= 0, VEN= 5V

All V

A_

= 0 or 5V,

V

NO_

= 0, VEN= +5V

RL= 75Ω, CL= 15pF,
V

NO_

= 1V

RMS,

f = 1MHz, Figure 7

Channel-to-Channel Crosstalk
(Note 8)

V

CT

-62 dB

936

V+ Supply Current I+

200 300

µA

I

GND

600

+25°C

V- and GND Supply Current

150 250

µA

C, E, M

+25°C 250 400

C, E, M

VC, E, MV+Power-Supply Range

450

375

+25°C

C, E, M

V

COM_

= 10V, RL = 2kΩ,

Figure 3

t

ON

220 500

700

T

A

CONDITIONSPARAMETER SYMBOL MIN TYP MAX UNITS

Off-Isolation
(Note 7)

V

ISO

dB

Break-Before-Make Time Delay
(Note 4)

RL= 75Ω, CL= 15pF,
V

NO_

= 1V

RMS,

f = 1MHz, Figure 6

t

BBM

+25°C -70

ns

V

COM_

= 10V, RL = 2kΩ,

Figure 4

Charge Injection
(Note 4)

+25°C 50 100

C, E, M

Q

350

Enable Turn-Off Time t

OFF

ns

V

COM_

= 10V, RL = 2kΩ,

Figure 3

+25°C 100 250

Enable Turn-On Time ns

pC

CL= 1.0nF, V

NO_

= 0, RS= 0,

Figure 5

+25°C 210

pF

All VA_= 0 or 5V

ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued)

(V+ = +12V, V- = 0, V

A_

H

= +2.4V, V

A_

L

= +0.8V, VEN= +2.4V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.) (Note 2)

SWITCH DYNAMIC CHARACTERISTICS

POWER SUPPLY

Note 2: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 3: NO_ pins are fault protected and COM_ pins are not fault protected. The max input voltage on NO_ pins depends on the

COM_ load configuration. Generally the max input voltage is ±36V with ±15V supplies and a load referred to ground. For
more detailed information refer to

NO_ Input Voltage

section.

Note 4: Guaranteed by design.
Note 5: ∆R

ON

= R

ON(MAX)

- R

ON(MIN)

.

Note 6: Leakage parameters are 100% tested at the maximum rated hot temperature and guaranteed by correlation at T

A

= +25°C.

Note 7: Off-isolation = 20log1

0(VCOM_

/ V

NO_

), where V

COM_

= output and V

NO_

= input to off switch.

Note 8: Between any two analog inputs.
Note 9: Leakage testing for single-supply operation is guaranteed by testing with dual supplies.
Note 10: Guaranteed by testing with dual supplies.

MAX4508/MAX4509

Fault-Protected, High-Voltage

Single 8-to-1/Dual 4-to-1 Multiplexers

_______________________________________________________________________________________

7

Typical Operating Characteristics

(V+ = +15V, V- = -15V, VEN= +2.4V, TA= +25°C, unless otherwise noted.)

0

200
100

400
300

600
500

700

900
800

1000

-20 -10 -5-15 0 5 10 15 20

ON-RESISTANCE vs.

V

COM

(DUAL SUPPLIES)

MAX4508/09toc01

V

COM

(V)

R

ON

(Ω)

V+ = +15V
V- = -15V

V+ = +10V
V- = -10V

V+ = +20V

V- = -20V

V+ = +4.5V
V- = -4.5V

0

200
100

400
300

600
500

700

900
800

1100
1000

010155 2025303540

ON-RESISTANCE vs.

V

COM

(SINGLE SUPPLY)

MAX4508/09toc02

V

COM

(V)

R

ON

(Ω)

V+ = +9V

V+ = +15V

V+ = +20V

V+ = +30V

V+ = +36V

V+ = +12V

0

200

100

400

300

500

600

-15 -5 0-10 5 10 15

ON-RESISTANCE vs. V

COM

AND

TEMPERATURE (DUAL SUPPLIES)

MAX4508/09toc03

V

COM

(V)

R

ON

(Ω)

V+ = +15V
V- = -15V

+125°C

+25°C

+70°C

-55°C

-40°C

+85°C

0

300
200
100

500
400

900
800
700
600

1000

02468101214

ON-RESISTANCE vs. V

COM

AND

TEMPERATURE (SINGLE SUPPLY)

MAX4508/09toc04

V

COM

(V)

R

ON

(Ω)

V+ = +12V
V- = 0

+125°C

-55°C

+70°C

-40°C

+85°C
+25°C

0.1p

1p

100p

10p

10n

100n

1n

1µ

-55 -5 20-30 45 70 95 120 145

LEAKAGE CURRENT vs. TEMPERATURE

MAX4508/09toc05

TEMPERATURE (°C)

LEAKAGE (A)

V+ = +15V
V- = -15V
V

COM

= 10V

V

NO

= ±10V

I

COM_OFF

I

COM_ON

I

NO_OFF

±

0

0.5

1.5

1.0

2.0

2.5

-15 -5-10 0 5 10 15

CHARGE INJECTION vs. V

COM

MAX4508/09toc06

V

COM

(V)

Q (pC)

V+ = +15V
V- = -15V

DUAL
SUPPLIES

SINGLE
SUPPLY

0

200
100

300

600

700

500
400

800

0 ±4±6±8±10±2 ±12 ±14 ±16 ±18 ±20

ENABLE ON AND OFF TIMES vs.

SUPPLY VOLTAGE (DUAL SUPPLIES)

MAX4508/09toc07

SUPPLY VOLTAGE (V)

t

ON

, t

OFF

(ns)

V

NO_

= ±10V

t

ON

t

OFF

0

100

50

200

150

300

250

350

010155 20253035

ENABLE ON AND OFF TIMES vs.

SUPPLY VOLTAGE (SINGLE SUPPLY)

MAX4508/09toc08

SUPPLY VOLTAGE (V)

t

ON

, t

OFF

(ns)

V

NO_

= +10V

t

ON

t

OFF

0

100

50

200

150

250

300

-55 5 35-25 65 95 125

ENABLE ON AND OFF TIMES

vs. TEMPERATURE

MAX4508/09toc09

TEMPERATURE (°C)

V+ = +15V
V- = -15V

t

ON

t

OFF

t

ON

, t

OFF

(ns)

MAX4508/MAX4509

Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 Multiplexers

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V+ = +15V, V- = -15V, V

EN

= +2.4V, TA= +25°C, unless otherwise noted.)

Note 2: Guaranteed by Design.

Guaranteed by Design

-300

-200

-100

0

100

200

300

-55 -5-30 20 45 70 95 120 145

POWER-SUPPLY CURRENT

vs. TEMPERATURE (V

A

= 0)

MAX4508/09toc10

TEMPERATURE (°C)

I+, I-, I

GND

(µA)

V+ = +15V
V- = -15V
V

A

= 0

I-

I

GND

I+

-600

0

-200

-400

200

400

600

-60 200-40 -20 40 60 80 100 120 140

POWER-SUPPLY CURRENT

vs. TEMPERATURE (V

A

= +5V)

MAX4508/09toc11

TEMPERATURE (°C)

SUPPLY CURRENT I+, I-, I

GND

(µA)

V+ = +15V
V- = -15V
V

A

= +5V

I-

I

GND

I+

0

0.5

1.0

1.5

2.0

2.5

3.0

0105 152025303540

LOGIC-LEVEL THRESHOLD

vs. SUPPLY VOLTAGE

MAX4508/09toc12

SUPPLY VOLTAGE (V)

LOGIC-LEVEL THRESHOLD (V)

V- = GND

DUAL

SUPPLIES

SINGLE

SUPPLY

FREQUENCY RESPONSE

MAX4508/09taoc13

FREQUENCY (MHz)

LOSS (dB)

20

-100

-80

-60

-40

-20

0

0.001 1 10 1000.01 0.1 1000

V+ = +15V
V- = -15V

BANDWIDTH

CROSSTALK

OFF-ISOLATION

5µs/div

FAULT-FREE SIGNAL PERFORMANCE

IN_

10V/div

10V/div

0V

0V

COM_

FAULT-FREE RAIL-TO-RAIL SIGNAL HANDLING
WITH ±15V SUPPLIES

+15V

+15V

-15V

-15V

MAX4508/09toc14

5µs/div

INPUT OVERVOLTAGE vs. OUTPUT CLAMPING

IN_

0V

COM_

±25V OVERVOLTAGE INPUT WITH THE OUTPUT
CLAMPED AT ±15V

-15V

-25V

+25V

+15V

0V0V

MAX4508/09toc16

MAX4508/MAX4509

Fault-Protected, High-Voltage

Single 8-to-1/Dual 4-to-1 Multiplexers

Detailed Description

Traditional fault-protected multiplexers are constructed
with three series FET switches. This produces good off
protection, but limits the switches input voltage range
to as much as 3V below the supply rails, reducing its
usable dynamic range. As the voltage on one side of
the switch approaches within about 3V of either supply
rail (a fault condition), the switch impedance increases,
limiting the output signal range to approximately 3V
less than the appropriate polarity supply voltage.

The MAX4508/MAX4509 differ considerably from tradi­tional fault-protected multiplexers, offering several
advantages. First, they are constructed with two paral­lel FETs, allowing very low resistance when the switch
is on. Second, they allow signals on the NO_ pins that
are within or beyond the supply rails to be passed
through the switch to the COM terminal. This allows rail­to-rail signal operation. Third, when a signal V

NO_

exceeds the supply rails (i.e., a fault condition), the
voltage on COM_ is limited to the supply rails.
Operation is identical for both fault polarities.

Pin Descriptions

Truth Tables

NAME FUNCTION

1 A0 Address Bit 0
2 EN Mux Enable

PIN

3 V- Negative Supply Voltage
4 NO1 Channel Input 1

8 COM Analog Output

7 NO4 Channel Input 4

6 NO3 Channel Input 3

5 NO2 Channel Input 2

12 NO5 Channel Input 5

11 NO6 Channel Input 6

10 NO7 Channel Input 7

9 NO8 Channel Input 8

13 V+ Positive Supply Voltage
14 GND Ground
15 A2 Address Bit 2
16 A1 Address Bit 1

MAX4508 (Single 8-to-1 Mux)

MAX4509 (Dual 4-to-1 Mux)

NAME FUNCTION

1 A0 Address Bit 0
2 EN Mux Enable

PIN

3 V- Negative Supply Voltage
4 NO1A Channel Input 1A

8 COMA Mux Output A

7 NO4A Channel Input 4A

6 NO3A Channel Input 3A

5 NO2A Channel Input 2A

13 NO1B Channel Input 1B

12 NO2B Channel Input 2B

11 NO3B Channel Input 3B

10 NO4B Channel Input 4B

9 COMB Mux Output B

14 V+ Positive Supply Voltage
15 GND Ground
16 A1 Address Bit 1

x x None
0 0 NO1
0 0 NO2
0 1 NO3

1 1 NO7

1 0 NO6

1 0 NO5

0 1 NO4

1 1 NO8

x
0
1
0

0

1

0

1

1

0
1
1
1

1

1

1

1

1

A1 ON SWITCHA2 A0 EN

MAX4508 (Single 8-to-1 Mux)

x None
0 NO1A
0 NO2A
1 NO3A
1 NO4A

x
0
1
0
1

0
1
1
1
1

A1 COMAA0 EN

MAX4509 (Dual 4-to-1 Mux)

None
NO1B
NO2B
NO3B
NO4B

COMB

_______________________________________________________________________________________ 9

MAX4508/MAX4509

When the NO_ voltage goes beyond supply rails (fault
condition), the NO_ input becomes high impedance
regardless of the switch state or load resistance. When
power is removed, and the fault protection is still in
effect, the NO_ terminals are a virtual open circuit. The
fault can be up to ±40V, with V+ = V- = 0. If the switch
is on, the COM_ output current is furnished from the V+
or V- pin by “booster” FETs connected to each supply
pin. These FETs can source or sink up to 10mA.

The COM_ pins are not fault protected. If a voltage
source is connected to any COM_ pin, it should be lim­ited to the supply voltages. Exceeding the supply volt­age will cause high currents to flow through the ESD
protection diodes, damaging the device (see

Absolute

Maximum Ratings

).

Figure 1 shows the internal construction, with the ana­log signal paths shown in bold. A single normally open
(NO) switch is shown. The analog switch is formed by
the parallel combination of N-channel FET N1 and P­channel FET P1 which are driven on and off simultane-

ously, according to the input fault condition and the
logic level state.

NO_ Input Voltage

The maximum allowable input voltage for safe opera­tion depends on whether supplies are on or off and the
load configuration at the COM output. If COM is re­ferred to a voltage other than ground, but within the
supplies, V

NO_

may range higher or lower than the sup-

plies provided the absolute value of V

NO_

- V

COM_



is
less than 40V. For example, if the load is referred to
+10V at COM_, then the NO_ voltage range can be
from +50V to -30V. As another example, if the load is
connected to -10V at COM_, the NO_ voltage range is
limited to -50V to +30V.

If the supplies are ±15V and COM is referenced to
ground through a load, the maximum NO_ voltage is
±25V. If the supplies are off and the COM output is ref­erenced to ground, the maximum NO_ voltage is ±40V.

Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 Multiplexers

10 ______________________________________________________________________________________

NORMALLY OPEN SWITCH CONSTRUCTION

COM_

P2

MAX4508
MAX4509

P1

N1

ON

LOW

FAULT

HIGH

FAULT

V+

NO_

A-

GWD

ESO CODE

V-

N2

Figure 1. Functional Diagram

MAX4508/MAX4509

Fault-Protected, High-Voltage

Single 8-to-1/Dual 4-to-1 Multiplexers

______________________________________________________________________________________ 11

Normal Operation

Two comparators continuously compare the voltage on
the NO_ pin with V+ and V- supply voltages. When the
signal on NO_ is between V+ and V-, the multiplexer
behaves normally, with FETs N1 and P1 turning on and
off in response to A_ signals (Figure 1). The parallel
combination of N1 and P1 forms a low-value resistor
between NO_ and COM_ so that signals pass equally
well in either direction.

Positive Fault Condition

When the signal on NO_ exceeds V+ by about 150mV,
the positive fault comparator output goes high, turning
off FETs N1 and P1 (Figure 1). This makes the NO_ pin
high impedance, regardless of the switch state. If the
switch state is “off,” all FETs turn off, and both NO_ and
COM_ are high impedance. If the switch state is “on,”
FET P2 turns on, clamping COM_ to V+.

Negative Fault Condition

When the signal on NO_ goes about 150mV below V-,
the negative fault comparator output goes high, turning
off FETs N1 and P1 (Figure 1). This makes the NO_ pin
high impedance, regardless of the switch state. If the
switch state is “off,” all FETs turn off, and both NO_ and
COM_ are high impedance. If the switch state is “on,”
FET N2 turns on, clamping COM_ to V-.

Transient Fault Condition

When a fast rising or falling transient on NO_ exceeds
V+ or V-, the output (COM_) follows the input (NO_) to
the supply rail with only a few nanoseconds delay. This
delay is due to the switch on-resistance and circuit
capacitance to ground. When the input transient
returns to within the supply rails, however, there is a
longer output recovery time. For positive faults, the
recovery time is typically 2.5µs (see

Typical Operating

Characteristics

). For negative faults, the recovery time
is typically 1.3µs. These values depend on the COM_
output resistance and capacitance. The delays do not
depend on the fault amplitude. Higher COM_ output
resistance and capacitance increase the recovery
times.

COM and A_

FETs N2 and P2 can source about ±10mA from V+ or
V- to the COM_ pin in the fault condition (Figure 1).
Ensure that if the COM_ pin is connected to a low­impedance load, the absolute maximum current rating
of 30mA is never exceeded, either in normal or fault
conditions.

The GND, COM_, and A_ pins do not have fault protec­tion. Reverse ESD protection diodes are internally con­nected between GND, COM_, A_, and both V+ and V-.
If a signal on GND, COM_, or A_ exceeds V+ or V- by
more than 300mV, one of these diodes will conduct.
During normal operation, these reverse-biased ESD
diodes leak a few nanoamps of current to V+ and V-

Fault Protection Voltage and Power Off

The maximum fault voltage on the NO_ pins is ±40V
from ground when the power is off. With ±15V supply
voltages, the highest voltage on NO_ can be V- + 40V,
and the lowest voltage on NO can be V+ - 40V.
Exceeding these limits can damage the chip.

Logic Level Thresholds

The logic level thresholds are CMOS and TTL compati­ble with V+ = 13.5V to V+ = 16.5V.

Applications Information

Ground

There is no connection between the analog signal
paths and GND. The analog signal paths consist of an
N-channel and a P-channel MOSFET with their sources
and drains paralleled and their gates driven out of
phase to V+ and V- by the logic-level translators.

V+ and GND power the internal logic and logic level
translators and set the input logic thresholds. The logic­level translators convert the logic levels to switched V+
and V- signals to drive the gates of the multiplexers.
This drive signal is the only connection between the
power supplies and the analog signals. GND, A_, and
COM_ have ESD protection diodes to V+ and V-.

Supply Current Reduction

When the logic signals are driven rail-to-rail from 0 to
+15V or -15V to +15V, the current consumption will be
reduced from 370µA (typ) to 200µA.

Power Supplies

The MAX4508/MAX4509 operate with bipolar supplies
between ±4.5V and ±20V. The V+ and V- supplies
need not be symmetrical, but their sum cannot exceed
the 44V absolute maximum rating.

The MAX4508/MAX4509 operate from single supplies
between +9V and +36V when V- is connected to GND.

MAX4508/MAX4509

Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 Multiplexers

12 ______________________________________________________________________________________

50%

t

OFF(EN)

tR < 20ns
t

F

< 20ns

+3V

0V

0V

LOGIC
INPUT
V

EN

SWITCH
OUTPUT
V

OUT

+15V

V

OUT

-15V

GND

V+

A1

V-

A0

A2

EN

NO1

NO2–NO8

COM

+10V

50Ω

MAX4508

1k

35pF

90%

10%

t

ON(EN)

+15V

V

OUT

-15V

GND

V+

A1

V-

A0

EN

NO1B

NO1A–NO4A

NO2B–NO4B,

COMA

COMB

+10V

50Ω

MAX4509

1k

35pF

V

EN

V

EN

Figure 2. Address Transition Time

Figure 3. Enable Switching Time

Test Circuits/Timing Diagrams

50%

t

TRANS

tR < 20ns
t

F

< 20ns

V

OUT

+3V

0V

V

NO1

0V

V

NO8

LOGIC
INPUT
V

A_

SWITCH
OUTPUT

+15V

V

OUT

-15V

GND

V+

A1

V-

A2

A0

EN

NO1

NO2–NO7

NO8

COM

+10V

-10V

50Ω

MAX4508

1k

35pF

+15V

V

OUT

-15V

GND

V+

A0

V-

A1

EN

NO1B

NO1A–NO4A

NO4B

COMB

+10V

50Ω

MAX4509

300Ω

35pF

90%

90%

t

TRANS

ON

-10V

+2.4V

+2.4V

MAX4508/MAX4509

Fault-Protected, High-Voltage

Single 8-to-1/Dual 4-to-1 Multiplexers

______________________________________________________________________________________ 13

50%

t

OPEN

tR < 20ns
t

F

< 20ns

+5V

+3V

0V

LOGIC
INPUT
V

A

SWITCH
OUTPUT
V

OUT

+15V

V

OUT

-15V

GND

V+

A0

V-

A1

A2

EN

NO1–NO8

COM

+10V

50Ω

MAX4508

1k

35pF

80%

+2.4V

0V

V

A

V

EN

Figure 4. MAX4508 Break-Before-Make Interval

Figure 5. Charge Injection

Figure 6. Off-Isolation

Figure 7. Crosstalk

Test Circuits/Timing Diagrams (continued)

+15V

R

S

V

S

CHANNEL

SELECT

NO

V

EN

EN

A0

A1
A2

V+

MAX4508

GND

+3V

-15V

LOGIC
INPUT

0V

V

COM

V-

V

C

L

1000nF

OUT

EN

V

OUT

IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER

∆V

OUT

ERROR V

WHEN THE CHANNEL TURNS OFF.

CTE

V

= ∆V

CTE

OUT CL

ONOFF OFF

∆V

OUT

V

IN

= 50Ω

R

S

NO1

NO8

A0

A1
A2

GND

MAX4508

EN

10nF

+15V

10nF

V+

COM

V-

-15V

OFF-ISOLATION = 20log

R
75Ω

10nF

+15V

GND

V+

MAX4508

EN

10nF

COM

R

V-

-15V
CROSSTALK = 20log

75Ω

V

OUT

L

V

OUT

V

IN

NO1

V

= 50Ω

G

IN

R
1kΩ

V

OUT

L

V

OUT

V

IN

R

NO2

NO8

A0
A1
A2

MAX4508/MAX4509

Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 Multiplexers

14 ______________________________________________________________________________________

+15V

-15V

GND

V+

A2

V-

A1

A0

NO8

MAX4508

CHANNEL

SELECT

NO1

COM

EN

1MHz

CAPACITANCE

ANALYZER

f = 1MHz

Figure 8. NO_, COM_ Capacitance

Figure 9. Transient Behavior of Fault Condition

Test Circuits/Timing Diagrams (continued)

Functional Diagrams/Truth Tables

DECODERS / DRIVERS

COM

NO1
NO2
NO3
NO4

NO5
NO6
NO7
NO8

A0 A1 A2 EN

V+ V- GND

MAX4508

A0A1A2 EN ON SWITCH

X
0
0
0
0
1
1
1
1

X
0
0
1
1
0
0
1
1

X
0
1
0
1
0
1
0
1

0
1
1
1
1
1
1
1
1

NONE

1
2
3
4
5
6
7
8

LOGIC "O" VAL ≤ +0.8V, LOGIC "1" VAH ≥ +2.4V

MAX4508

+25V

VNO_

-15V

-25V

+15V

V

COM_

MAX4509

NO1A
NO2A
NO3A
NO4A

NO1B
NO2B
NO3B
NO4B

V+ V- GND

DECODERS / DRIVERS

A0 A1 EN

COMA

COMB

LOGIC "O" VAL ≤ +0.8V, LOGIC "1" VAH ≥ +2.4V

X
0
0
1
1

MAX4509

A0A1 EN ON SWITCH

X

0

NONE
0
1
0
1

1
1
1
1

1
2
3
4

MAX4508/MAX4509

Fault-Protected, High-Voltage

Single 8-to-1/Dual 4-to-1 Multiplexers

______________________________________________________________________________________ 15

Ordering Information (continued)

16 CERDIP**-55°C to +125°CMAX4509MJE

16 Plastic DIP-40°C to +85°CMAX4509EPE

16 Narrow SO-40°C to +85°CMAX4509ESE

16 SSOP-40°C to +85°CMAX4509EAE

Dice*0°C to +70°CMAX4509C/D

16 Plastic DIP

16 Narrow SO

16 SSOP

PIN-PACKAGETEMP. RANGE

0°C to +70°C
0°C to +70°C
0°C to +70°CMAX4509CPE

MAX4509CSE

MAX4509CAE

PART

___________________Chip Topography

TRANSISTOR COUNT: 543
SUBSTRATE IS INTERNALLY CONNECTED TO V+.

*

Contact factory for dice specifications.

**

Contact factory for availability.

0.198"

(5.03mm)

0.086"

(2.18mm)

V-

N01

N02

N03

N04

N08

COM

N07

N.C.

N06

N05

V+

GND

EN A0 A1 A2

MAX4508/MAX4509

Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 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.

16

____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

Package Information

SSOP.EPS