MAX4709ESE+T中文资料

General Description

The MAX4708/MAX4709 8-to-1 and dual 4-to-1 fault-pro-tected multiplexers are pin compatible with the industry-standard DG508/DG509. The MAX4708/MAX4709 are similar to the MAX4508/MAX4509, but these devices do not have clamp diodes to the supply rails on the switch outputs. These multiplexers feature fault-protected inputs, Rail-to-Rail ?signal-handling capability, and do not require power-supply sequencing.

Both devices offer ±40V overvoltage protection with the supplies off, ±36V protection with the supplies on, and feature 400?(max) on-resistance with 15?(max)matching between channels. The MAX4708/MAX4709operate with dual supplies of ±4.5V to ±20V or a single supply of +9V to +36V. All digital inputs have TTL logic-compatible thresholds, ensuring both TTL and CMOS logic compatibility when using a single +12V supply or dual ±15V supplies.

For low-voltage applications requiring fault protection,refer to the MAX4711/MAX4712/MAX4713 data sheet.

Applications

Data-Acquisition Systems Industrial and Process Control Avionics Signal Routing

Redundancy/Backup Systems ATE Systems Hot Swap

Features

o No Power-Supply Sequencing Required

o All Channels Off with Power Off o Rail-to-Rail Signal Handling o 400?(max) On-Resistance

o ±40V Fault Protection with Power Off o ±25V Fault Protection with ±15V Supplies o 100ns Fault-Response Time o ±4.5V to ±20V Dual Supplies o +9V to +36V Single Supply

o TTL/CMOS-Compatible Logic Inputs

MAX4708/MAX4709

Fault-Protected, Single 8-to-1/

Dual 4-to-1 Multiplexers

________________________________________________________________Maxim Integrated Products

1

Ordering Information

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

Pin Configurations/Functional Diagrams

19-4804; Rev 0; 9/02

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at http://m.wendangku.net/doc/748efdccbb4cf7ec4afed0c3.html.

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

M A X 4708/M A X 4709

MAX4709ESE+T中文资料

Fault-Protected, 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, V EN = +2.4V, T A = 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.

(All 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_, EN (Note 1)........................(V+ + 0.3V) to (V- - 0.3V)NO_.........................................................(V+ - 40V) to (V- + 40V)NO_ to COM_..........................................................-36V to +36V NO_ Voltage with Switch Power On ........................-30V to +30V NO_ Voltage 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 Narrow SO (derate 8.70mW/°C above +70°C).......696mW 16 Plastic DIP (derate 10.53mW/°C above +70°C).....842mW 16 Wide SO (derate 9.52mW/°C above +70°C)...........762mW Operating Temperature Range

MAX4708E_ E/MAX4709E_E...........................-40°C to +85°C Junction Temperature..................................................... +150°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10s).................................+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.

MAX4708/MAX4709

Fault-Protected, 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, V EN = +2.4V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)

MAX4709ESE+T中文资料

M A X 4708/M A X 4709

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

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

ELECTRICAL CHARACTERISTICS —Dual Supplies (continued)

(V+ = +15V, V- = -15V, V A_H = +2.4V, V A_L = +0.8V, V EN = +2.4V, T A = 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, V EN = +2.4V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at

T A = +25°C.) (Note 2)

MAX4708/MAX4709

Fault-Protected, Single 8-to-1/

Dual 4-to-1 Multiplexers

_______________________________________________________________________________________5

ELECTRICAL CHARACTERISTICS —Single +12V Supply (continued)

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

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, see the NO_ Input Voltage section.

Note 4:Guaranteed by design and not production tested.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:Dynamic testing is 100% functionally tested on the ATE system and correlated with the initial design characterization per

Figures 2 and 3.

Note 8:Off-Isolation = 20 ?log 10(V COM_/ V NO_), where V COM_= output and V NO_= input to open switch.Note 9:Between any two analog inputs.

Note 10: Guaranteed by testing with dual supplies.

M A X 4708/M A X 4709

Fault-Protected, Single 8-to-1/Dual 4-to-1 Multiplexers 6_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS —Single +12V Supply (continued)

(V+ = +12V, V- = 0, V A_H = +2.4V, V A_L = +0.8V, V EN = +2.4V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)

ON-RESISTANCE vs. V COM

(DUAL SUPPLIES)

MAX4709ESE+T中文资料

V COM (V)

R O N (?)

15

10

5

0-5

-10

-15

200

4006008001000

0-20

20

ON-RESISTANCE vs. V COM

(SINGLE SUPPLY)

MAX4709ESE+T中文资料

V COM (V)

R O N (?)

30

24

1812

6

200

400

600

800

1000

MAX4709ESE+T中文资料

36

ON-RESISTANCE vs. V COM AND TEMPERATURE

(DUAL SUPPLIES)

V COM (V)

R O N (?)

10

5

0-5

-10

100200

300400500

6000

-15

15

Typical Operating Characteristics

(V+ = +15V, V- = -15V, V EN = +2.4V, T A = +25°C, unless otherwise noted.)

MAX4708/MAX4709

Fault-Protected, Single 8-to-1/

Dual 4-to-1 Multiplexers

_______________________________________________________________________________________7

ON-RESISTANCE vs. V COM AND TEMPERATURE

(SINGLE SUPPLY)

MAX4709ESE+T中文资料

V COM (V)

R O N (?)

108642200400

600

800

100000

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

12

MAX4709ESE+T中文资料

10000.1-40

-15

10

60

85

LEAKAGE CURRENT vs. TEMPERATURE

1

10

100TEMPERATURE (°C)

L E A K A G E C U R R E N T (p A )

MAX4709ESE+T中文资料

35

CHARGE INJECTION vs. V COM

V COM (V)

Q (p C )

10

5

0-5

-10

-5

5

10

-10

-15

MAX4709ESE+T中文资料

15

ENABLE TURN-ON/OFF TIMES vs. SUPPLY VOLTAGE (DUAL SUPPLIES)

SUPPLY VOLTAGE (V+, V-)

t O N /t O F F (n s )

15

10

5

100

200

300

400500

00

20

ENABLE TURN-ON/OFF TIMES

vs. SUPPLY VOLTAGE (SINGLE SUPPLY)

MAX4709ESE+T中文资料

SUPPLY VOLTAGE (V+)t O N /t O F F (n s )

271850100150200

2503000

936ENABLE ON/OFF TIMES vs. TEMPERATURE

TEMPERATURE (°C)

t O N /t O F F (n s )

603510-1550

MAX4709ESE+T中文资料

100150200

2503000

-4085

SUPPLY CURRENT vs. TEMPERATURE

(V A_ = 0)

TEMPERATURE (°C)

S U P P L Y C U R R E N T (μA )

603510-15

-400-300-200-1000100200300400500-500

-40

85

SUPPLY CURRENT vs. TEMPERATURE

(V A_ = +5V)

TEMPERATURE (°C)

S U P P L Y C U R R E N T (μA )

60

35

10

-15

-300-200-1000100200300400500600-400

-40

85

LOGIC-LEVEL THRESHOLD VOLTAGE

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

T H R E S H O L D V O L T A G E (V )

35

30

25

20

15

10

5

1.5

2.0

2.5

3.0

1.0

40

Typical Operating Characteristics (continued)

(V+ = +15V, V- = -15V, V EN = +2.4V, T A = +25°C, unless otherwise noted.)

M A X 4708/M A X 4709

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

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

FREQUENCY RESPONSE

FREQUENCY (MHz)

L O S S (d B )

20-100

-80-60-40

-20

00.001

1

10

100

0.01

0.1

1000

FAULT CURRENT vs. FAULT VOLTAGE

(DUAL SUPPLIES)

V COM (V)I C O M (μA )

40

20

-60

-40

-20

-150-100-50050100150200-200

-80

60

FAULT CURRENT vs. FAULT VOLTAGE

(SINGLE SUPPLY)

V COM (V)

I C O M (μA )

60

40

-60

-40

-20

20

-150-100

-50050100

150200

-200

-80

80

INPUT OVERVOLTAGE vs. OUTPUT VOLTAGE

MAX4708/09 toc16

4.00μs

GND V NO_INPUT 10V/div GND V COM_OUTPUT 200mV/div

INPUT OVERVOLTAGE vs. OUTPUT VOLTAGE

MAX4708/09 toc17

200μs

GND V NO_INPUT 10V/div GND

V COM_OUTPUT 10V/div FAULT RECOVERY TIME (POSITIVE INPUT)

MAX4708/09 toc18

1.00μs

GND

V NO_INPUT 10V/div GND

V COM_OUTPUT 5V/div FAULT RECOVERY TIME (NEGATIVE INPUT)

MAX4708/09 toc19

1.00μs GND V NO_INPUT 10V/div

GND V COM_OUTPUT 5V/div

FAULT RESPONSE TIME (POSITIVE INPUT)

MAX4708/09 toc20

100ns/div GND V NO_INPUT 10V/div GND

V COM_OUTPUT 5V/div FAULT RESPONSE TIME (NEGATIVE INPUT)

MAX4708/09 toc21

100ns/div

GND V NO_INPUT 10V/div GND V COM_OUTPUT 5V/div

Typical Operating Characteristics (continued)

(V+ = +15V, V- = -15V, V EN = +2.4V, T A = +25°C, unless otherwise noted.)

MAX4708/MAX4709

Fault-Protected, Single 8-to-1/

Dual 4-to-1 Multiplexers

_______________________________________________________________________________________9

Pin Descriptions

MAX4708 (Single 8-to-1 Mux)

MAX4709 (Dual 4-to-1 Mux)

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

Truth Tables

MAX4709ESE+T中文资料

X = Don’t care.

M A X 4708/M A X 4709

Detailed Description

Several unique features differentiate the MAX4708/MAX4709 from traditional fault-protected multiplexers.First, instead of the three series FETs utilized in older designs, the MAX4708/MAX4709 design employs two parallel FETs for lower on-resistance and improved flat-ness. Second, older devices limited the range of signal amplitudes the switch could pass by as much as 3V below the supply rails. The MAX4708/MAX4709 feature rail-to-rail signal handling that allows the devices to transmit signals with amplitudes at or slightly beyond the supply rails. Finally, in former designs (MAX4508/MAX4509), when a fault occurred, the devices clamped and held the output voltage at the appropriate supply rail until the fault was removed. Instead, the MAX4708/MAX4709 now disconnect COM_ from NO_during a fault condition, making COM_ a high-imped-ance output as long as the fault is present. Operation is identical for both positive and negative fault polarities.When the NO_ voltage ranges beyond supply rails (fault condition), the NO_ input becomes high imped-ance, regardless of the switch state or load resistance.If power is removed, and the fault voltage is still pre-sent, the NO_ terminals remain high impedance. The fault voltage can be up to ±40V, with V+ = V- = 0.

The COM_ pins are not fault protected. Limit any volt-age sources connected to COM_ to the supply rails.Figure 1 shows the internal construction of a single nor-mally open (NO) switch, with the analog signal paths shown in bold. The parallel combination of N-channel FET N1 and P-channel FET P1 form the analog switch.During normal operation, these FETs are driven on and off simultaneously according to the control voltages on A_. During a fault condition, both FETs turn off.

NO_ Input Voltage

The maximum allowable input voltage for safe operation depends on whether supplies are on or off, and the load configuration on COM_. If COM_ is referred to a voltage other than ground, but within the supplies, V NO_can range higher or lower than the supplies, provided the absolute value of |V NO_- V COM_| is less than 40V.

For example, with V+ = V- = 0, if the load is referred to +10V at COM_, then the NO_ voltage range can be from +50V to -30V. If the supplies are ±15V and COM_is referenced to ground through a load, the maximum NO_ voltage is ±36V. If the supplies are off and the COM output is referenced to ground, the maximum NO_ voltage is ±40V.

Normal Operation

Two comparators continuously compare the voltage on NO_ with V+ and V- supply voltages. When the signal on NO_ ranges between V+ and V-, the multiplexer operates normally, with FETs N1 and P1 turning on and off in response to the control signals on A_ (Figure 1).When the switch state is on, the parallel combination of N1 and P1 forms a low-value resistor between NO_ and COM_ so that signals pass equally well in either direc-tion. When the switch state is off, both NO_ and COM_are high-impedance inputs.

Fault Conditions

A fault condition occurs when the voltage at any NO_input exceeds the supply rail. At this point, the output of one of the two fault comparators goes high, effectively turning OFF both FETs N1 and P1. With the two FETs in the OFF position, both the switch input (NO_) and the output (COM_) go into a high-impedance state. They remain high impedance regardless of the state of the control voltages in A_ and EN, until the fault is removed.The input voltage must not exceed the absolute maxi-mum rating at any moment (see the Absolute Maximum Ratings section).

Transient Fault Condition

When a fast rising or falling transient on NO_ exceeds V+ or V-, there is a 100ns delay before the fault protec-tion turns on (see the Typical Operating Charac-teristics , Fault Response Time). COM_ follows NO_until the fault protection turns on. This delay is due to the switch on-resistance and circuit capacitance to ground. When the input transient returns to within the supply rails, there is a longer output recovery time (see the Typical Operating Characteristics , Fault Response Times). These values depend on the COM_ output resistance and capacitance. Higher COM_ output resis-tance and capacitance increase the recovery times.The delays do not depend on the fault amplitude.

COM and A_

The GND, COM_, and A_ pins are not fault protected.ESD-protection diodes internally connect A_ to both V+and V-. If a signal on GND, COM_, or A_ exceeds V+ or V- by more than 300mV, excessive current can flow to or from the supplies, possibly damaging the device.

Logic-Level Thresholds

The logic-level thresholds are CMOS and TTL compatible with V+ = +15V and V- = -15V. Logic levels change as V+increases (see the Typical Operating Characteristics ,Logic-Level Threshold Voltage vs. Supply Voltage.)

Fault-Protected, Single 8-to-1/Dual 4-to-1 Multiplexers 10______________________________________________________________________________________

Applications Information

Ground

V+ and GND power the internal logic and logic-level trans-lators. The logic-level translators convert the logic-level inputs to V+ and V- to drive the gates of the internal FETs.In this design, there is no galvanic connection inside the MAX4708/MAX4709 between the analog signal paths and GND. ESD-protection diodes connect A_ to V+ and V-.

Supply Current Reduction

Driving the logic signals rail-to-rail from 0 to +15V or -15V to +15V reduces the current consumption from 370μA (typ) to 200μA (typ) (see the Electrical Charac-teristic s table, Power Supplies).

Power Supplies

The MAX4708/MAX4709 operate with bipolar supplies between ±4.5V and ±20V. The V+ and V- supplies need not be symmetrical, but V+ - V- cannot exceed the 44V absolute maximum rating.

The MAX4708/MAX4709 operate from single supplies between +9V and +36V when V- is connected to GND.

Chip Information

TRANSISTOR COUNT: 527

SUBSTRATE INTERNALLY CONNECTED TO V+

Package Information

For the latest package outline information, go to http://m.wendangku.net/doc/748efdccbb4cf7ec4afed0c3.html/packages .

MAX4708/MAX4709

Fault-Protected, Single 8-to-1/

Dual 4-to-1 Multiplexers

______________________________________________________________________________________11

MAX4709ESE+T中文资料

Pin Configurations/Functional Diagrams (continued)

Figure 1. Functional Diagram

M A X 4708/M A X 4709

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

Fault-Protected, Single 8-to-1/Dual 4-to-1 Multiplexers 12______________________________________________________________________________________

Test Circuits/Timing Diagrams

MAX4708/MAX4709

Fault-Protected, Single 8-to-1/

Dual 4-to-1 Multiplexers

______________________________________________________________________________________

13

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

Test Circuits/Timing Diagrams (continued)

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

M A X 4708/M A X 4709

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

MAX4709ESE+T中文资料

Fault-Protected, 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.

14____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600?2002 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

Test Circuits/Timing Diagrams (continued)

Functional Diagrams/Truth Tables

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