MAX4505EUK-MAX4505EUK+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX4505EUK-MAX4505EUK+T
Fault-Protected, High-Voltage, Signal Line Protector
MAX4505
Fault-Protected, High-Voltage,
Signal-Line Protector
19-1514; Rev 0; 7/99
General Description
The MAX4505 is a single signal-line protector featuring a
fault-protected input and Rail-to-Rail®signal handling
capability. The input is protected from overvoltage faults
up to ±36V with power on or ±40V with power off. During
a fault condition, the input terminal becomes an open cir-
cuit and only nanoamperes of leakage current flow from
the source, while the switch output (AOUT) furnishes typ-
ically 19mA from the appropriate polarity supply to the
load. This ensures an unambiguous rail-to-rail output
when a fault begins and ends.
The MAX4505 protects both unipolar and bipolar analog
signals using either unipolar (+9V to +36V) or bipolar
(±8V to ±18V) power supplies. The device has no logic
control inputs; the protector is always on when the sup-
plies are on. On-resistance is 100Ωmax, and on-leakage
is less than 0.5nA at TA= +25°C. The MAX4505 is avail-
able in 5-pin SOT23 and 8-pin µMAX packages.
Applications
Process Control Systems
Hot-Insertion Boards/Systems
Data-Acquisition Systems
Redundant/Backup Systems
ATE Equipment
Sensitive Instruments
FeaturesOvervoltage Protection
±40V with Power Off
±36V with Power OnOpen Signal Paths with Power OffOutput Clamps to Either Rail with an Input
Overvoltage100Ωmax On-Resistance10ns Overvoltage Turn-On DelayNo Latchup During Power SequencingRail-to-Rail Signal Handling500ΩOutput Clamp Resistance During
OvervoltageTiny 5-Pin SOT23 PackageAIN
ROUT
OUTAOUT
RAIL
SENSORV+V+V+MAX4505
Typical Operating CircuitPin Configurations
N.C.AOUTV-AIN
MAX4505
SOT23-5
TOP VIEW
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Pin Configurations continued at end of data sheet.
Ordering Information
PARTTEMP. RANGEPIN-
PACKAGE
TOP
MARK
ADLW5 SOT23-5-40°C to +85°CMAX4505EUK-T
MAX4505EUA-40°C to +85°C8 µMAX—
MAX4505
Fault-Protected, High-Voltage,
Signal-Line Protector
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING GUIDELINES
ELECTRICAL CHARACTERISTICS—Dual Supplies
(V+ = +15V, V- = -15V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
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)........................................................................-0.3V to +44.0V
V-.........................................................................-44.0V to +0.3V
V+ to V-................................................................-0.3V to +44.0V
AIN, AOUT (Notes 1, 2).......................................................±44V
AIN Overvoltage with Power On..........................................±36V
AIN Overvoltage with Power Off..........................................±40V
Continuous Current into Any Terminal..............................±30mA
Peak Current into Any Terminal
(pulsed at 1ms, 10% duty cycle)...............................±70mA
Continuous Power Dissipation (TA= +70°C)
5-Pin SOT23-5 (derate 7.10mW/°C above +70°C)...571mW
8-Pin µMAX (derate 4.10mW/°C above +70°C)........330mW
Operating Temperature Ranges
MAX4505C_ _..................................................0°C to +70°C
MAX4505E_ _...............................................-40°C to +85°C
Storage Temperature Range.............................-55°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
V+ to GND..............................................................-0.3V to +40V
V- to GND...............................................................-32V to +0.3V
V+ to V-..................................................................................40V
AIN.......................................................................................±40V
AOUT...............................................................................V+ to V-
AIN to AOUT.........................................................40V differential
Continuous Current into Any Terminal..............................≤30mA
Peak Current into Any Terminal
(pulsed at 1ms, 10% duty cycle)...............................≤70mAPARAMETERSYMBOLMINTYPMAXUNITSCONDITIONSFault-Free Analog Signal Range
(Note 4)VAINV-V+VVAIN = ±15V125Ω+25°CAnalog Signal-Path ResistanceRON65100VAIN= ±10V, IAOUT= 1mA-2020nA+25°CSignal-Path Leakage Current
(Note 5)IAOUT(ON)-0.50.5VAOUT= ±10V, VAIN= ±10V
or floating+25°CInput CapacitanceCAIN20VAIN= 0, f = 1MHz-4040VEFault-Protected Analog Signal
Range (Notes 4, 6)VAIN-3636Applies with power on
Applies with power off-200200nA+25°CInput Signal-Path Leakage
Current, Supplies OnIAIN(ON)-200.120VAIN= ±25V, VAOUT= open-500500nA+25°CInput Signal-Path Leakage
Current, Supplies OffIAIN(OFF)-200.220VAIN= ±40V, VAOUT= open
V+ = 0, V- = 0
+25°C-26-19-13mA+25°COutput Clamp Current,
Supplies OnIAOUT131926VAIN= 25V
VAIN= -25V
+25°C0.41.0kΩ+25°COutput Clamp Resistance,
Supplies OnRAOUT0.51.0IAOUT= 1mAVAIN= 25V
VAIN= -25V+25°C±Fault Output Turn-On
Delay Time10RL= 10kΩ, VAIN= ±25V
ANALOG SWITCH
FAULT PROTECTION
Note 1:The AOUT pin is not fault protected. Signals on AOUT exceeding V+ or V- are clamped by internal diodes. Limit forward
diode current to maximum current rating.
Note 2:The AIN pin is fault protected. Signals on AIN exceeding -36V to +36V may damage the device. These limits apply with
power applied to V+ or V-, or ±40V with V+ = V- = 0.
MAX4505
Fault-Protected, High-Voltage,
Signal-Line Protector
ELECTRICAL CHARACTERISTICS—Single Supply
(V+ = +12V, V- = 0, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +15V, V- = -15V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
Note 3:The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 4:See Fault-Free Analog Signal Range vs. Supply Voltage graph in the Typical Operating Characteristics.
Note 5:Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at TA= +25°C.
Note 6:Guaranteed by design.
Note 7:Guaranteed by testing with dual supplies.
Note 8:SOT packaged parts are 100% tested at +25°C. Limits at the maximum rated temperature are guaranteed by design and
correlation limits at +25°C. Leakage tests are typical for SOTpackaged parts.Power-Supply RangeV+, V-±8±18V
PARAMETERSYMBOLMINTYPMAXUNITS
240µA
CONDITIONS
+25°CI+45150VAIN= 15VFault-Free Analog Signal Range
(Note 4)VAIN0V+VVAIN = 12V-2020nA+25°C
Signal-Path Leakage Current
(Note 5)IAOUT(ON)
PARAMETERSYMBOLMINTYPMAXUNITS
-0.50.050.5VAIN= 10V or floating
Applies with power off
CONDITIONS
+25°CAnalog Signal-Path ResistanceRON125200
VAIN= 10V, IAOUT= 1mA-4040-200200EFault-Protected Analog Signal
Range (Notes 4, 6)VAIN-3636Applies with power on+25°C
+25°C
+25°C
±Fault Output Turn-On
Delay Time
Input Signal-Path Leakage
Current, Supply On (Note 7)
IAIN(ON)-200.220VAIN= ±25V, VAOUT= 0
±Fault Recovery Time = 10kΩ, VAIN= 25V
2.5+25°CInput Signal-Path Leakage
Current, Supply Off (Note 7)IAIN(OFF)= 10kΩ, VAIN= 25V
-200.220VAIN= ±40V+25°COutput Clamp Current,
Supply OnIAOUT35.510VAIN= 25V+25°COutput Clamp Resistance,
Supply OnRAOUT1.02.5VAIN= ±25VEPower-Supply RangeV+, V-+9+36+25°CPower-Supply CurrentI+525VAIN = 12VE40
+25°C±Fault Recovery Time 25µsRL= 10kΩ, VAIN= ±25V-240
+25°CPower-Supply Current-150-45VAIN= 15V
POWER SUPPLY
ANALOG SWITCH
FAULT PROTECTION
POWER SUPPLY
MAX4505
Fault-Protected, High-Voltage,
Signal-Line Protector
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
ON-RESISTANCE vs. OUTPUT VOLTAGE
(DUAL SUPPLIES)
MAX4505 toc01
VOUT_ (V)
V+ = +18V
V- = -18V
V+ = +15V
V- = -15V
V+ = +10V
V- = -10V
V+ = +8V
V- = -8V
ON-RESISTANCE vs. OUTPUT VOLTAGE
(SINGLE SUPPLY)
MAX4505 toc02
VOUT_ (V)
V+ = +12V
V+ = +9V
V+ = +20V
V+ = +30V
V+ = +36V
V- = 0
ON-RESISTANCE vs. OUTPUT VOLTAGE
AND TEMPERATURE (DUAL SUPPLIES)
MAX4505 toc03
VOUT_ (V)
V+ = +15V
V- = -15V
TA = +125°C
TA = +85°C
TA = +70°C
TA = -55°C
TA = -40°CTA = +25°C
ON-RESISTANCE vs. OUTPUT VOLTAGE
AND TEMPERATURE (SINGLE SUPPLY)
MAX4505 toc04
VOUT_ (V)
TA = +125°C
TA = +85°C
TA = +70°C
TA = -55°C
V+ = +12V
V- = 0
TA = -40°CTA = +25°C
OUTPUT TRANSFER CHARACTERISTICS
(DUAL SUPPLIES)
MAX4505 toc07
INPUT VOLTAGE (V)
OUTPUT CLAMP VOLTAGE (V)
(V+ = +18V, V- = -18V)
(V+ = +15V, V- = -15V)
(V+ = +10V, V- = -10V)
(V+ = +8V, V- = -8V)
(V+ = +8V, V- = -8V)
(V+ = +10V, V- = -10V)
(V+ = +15V, V- = -15V)
(V+ = +18V, V- = -18V)
OUTPUT LOAD = 1MW
INPUT VOLTAGE
LINEARLY SWEPT
BETWEEN -30V
AND +30V
OUTPUT CLAMP RESISTANCE
(SUPPLIES ON) vs. TEMPERATURE
MAX4505 toc05
TEMPERATURE (°C)
OUT
(k
V+ = +15V
V- = -15V
VIN = ±2.5V
VIN = -25V
VIN = +25V
OUTPUT CLAMP CURRENT (SUPPLIES ON)
vs. TEMPERATURE
MAX4505 toc06
TEMPERATURE (°C)
IOUT
(mA)
V- = -15V
V+ = +15V
OUTPUT TRANSFER CHARACTERISTICS
(SINGLE SUPPLY)
MAX4505 toc08
INPUT VOLTAGE (V)
OUTPUT CLAMP VOLTAGE (V)
INPUT VOLTAGE LINEARLY SWEPT
BETWEEN 0 AND 36V
OUTPUT LOAD = 1MW
V- = 0
V+ = +9V
V+ = +25V
V+ = +36V
V+ = +15V
V+ = +12V
FAULT-FREE ANALOG SIGNAL RANGE
vs. SUPPLY VOLTAGE
MAX4505 toc09
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
MAX4505
Fault-Protected, High-Voltage,
Signal-Line Protector
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
0.01p
0.1p
10p
10n
100p
100n
FAULT-FREE OUTPUT LEAKAGE CURRENT
(SUPPLIES ON)
MAX4505 toc10
TEMPERATURE (°C)
LEAKAGE CURRENT (A)
VOUT = ±10V
IOUT (V+ = +15V, V- = -15V)
IOUT (V+ = +12V, V- = 0)
0.1p
100p
10p
10n
100n
INPUT FAULT LEAKAGE CURRENT
(SUPPLIES ON)
MAX4505 toc11
TEMPERATURE (°C)
LEAKAGE CURRENT (A)IIN AT +25V (V+ = +12V, V - = 0)
IIN AT +25V (V+ = +15V, V- = -15V)
POWER SUPPLY CURRENT
vs. TEMPERATURE
MAX4505 toc12
TEMPERATURE (°C)
SUPPLY CURRENT (
I+ SINGLE SUPPLY +12V
V+ = +15V
V- = -15V
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX4505 toc13
INPUT VOLTAGE (V)
SUPPLY CURRENT (
FREQUENCY RESPONSE
MAX4505 toc15
FREQUENCY (MHz)
BANDWIDTH (dB)
V+ = +15V
V- = -15V
IN_
10V/div
+15V
-15V
+15V
-15V
10V/div
OUT_s/div
FAULT-FREE SIGNAL PERFORMANCE
MAX4505 toc16
FAULT-FREE RAIL-TO-RAIL SIGNAL HANDLING
WITH ±15V SUPPLIES
IN_
+25V
+15V
-25V
-15V
±25V OVERVOLTAGE INPUT WITH THE OUTPUT
CLAMPED AT ±15V
OUT_s/div
INPUT OVERVOLTAGE
vs. OUTPUT CLAMPING
MAX4505 toc17
IN_
5V/div
+16V
+15V
OUT_
5V/divs/div
FAULT RECOVERY
MAX4505 toc18
V+ = +15V
V- = -15V
_______________Detailed Description
The MAX4505 protects other ICs from overvoltage by
clamping its output voltage to the supply rails. If the
power supplies to the device are off, the device clamps
the output to 0V. The MAX4505 provides protection for
input signals up to ±36V with the power supplies on
and ±40V with the power supplies off.
The MAX4505 protects other integrated circuits (ICs)
connected to its output from latching up. Latchup is
caused by parasitic SCR(s) within the IC turning on,
and can occur when the supply voltage applied to the
IC exceeds the specified operating range. Latchup can
also occur when signal voltage is applied before the
power-supply voltage. When in a latchup state, the cir-
cuit draws excessive current and may continue to draw
excessive current even after the overvoltage condition
is removed. A continuous latchup condition may dam-
age the device permanently. Such “faults” are com-
monly encountered in modular control systems where
power supplies to interconnected modules may be
interrupted and reestablished at random. Faults can
happen during production testing, maintenance, start-
up, or a power failure.
Figure 1shows the normal complementary pair (N1
and P1) found in many common analog switches. In
addition to these transistors, the MAX4505 also con-
tains comparators, sensing circuitry, and clamping cir-
cuitryto control the state of N1 and P1. During normal
operation, N1 and P1 remain on with a typical 65Won-
resistance between IN and OUT.
The on-board comparators and sensing circuitry moni-
tor the input voltage for possible overvoltage faults.
Two clamp circuits limit the output voltage to within the
supply voltages. When the power supplies are off, any
input voltage applied at IN turns off both N1 and P1,
and OUT is clamped to 0V.
Normal Operation
When power is applied, the protector acts as a resistor
in series with the signal path. A voltage on the “input”
side of the switch conducts through the protector to the
output (Figure 2).
When the output load is resistive, it draws current
through the protector. The internal resistance is typical-
ly less than 100Ω. The MAX4505 does not affect high-
impedance loads. The protector’s path resistance is a
function of the supply voltage and the signal voltage
(see Typical Operating Characteristics).
MAX4505
Fault-Protected, High-Voltage,
Signal-Line Protector
Pin Description
-15V
-15V
+15VP-CHANNEL
DRIVER
N-CHANNEL
DRIVER
+15VN1
CLAMP
OUT
CLAMP
+V(+15V)
-V(-15V)
COMPARATOR
COMPARATOR
SENSE
SWITCH
SENSE
SWITCH
Figure 1. Simplified Internal Structure
μMAXSOT
AINAnalog Fault-Protected Input31
N.C.
AOUT
NAME
Negative Supply Voltage Input45
No Connection. Not internally connected.2, 5, 6, 74
Analog Signal Output13
Positive Supply Voltage Input82
FUNCTIONPIN

Partno	Mfg	Dc	Qty	Available	Descript
MAX4505EUK	MAXIM	N/a	150	avai	Fault-Protected, High-Voltage, Signal Line Protector
MAX4505EUK+T	N/A	N/a	2500	avai	Fault-Protected, High-Voltage, Signal Line Protector