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General Description

The MAX4510/MAX4520 single-pole/single-throw (SPST),

fault-protected analog switches feature a fault-protected

input and Rail-to-Rail

signal-handling capability. The

normally open (NO) and normally closed (NC) terminals

are protected from overvoltage faults up to 36V during

power-on and 44V with power off. During a fault condi-

tion, the switch input terminal (NO or NC) becomes an

open circuit; only nanoamperes of leakage current flow

from the fault source, and the switch output (COM) fur-

nishes up to 13mA of the appropriate polarity supply

voltage to the load. This ensures unambiguous rail-to-rail

outputs when a fault begins and ends.

On-resistance is 160Ω max. The off-leakage current is

only 0.5nA at +25°C and 10nA at +85°C. The MAX4510

is a normally closed switch, while the MAX4520 is a

normally open switch. These CMOS switches operate

with dual power supplies ranging from ±4.5V to ±20V

or a single supply between +9V and +36V.

The digital input has +0.8V and +2.4V logic thresholds,

ensuring both TTL- and CMOS-logic compatibility when

using ±15V or a single +12V supply. The MAX4510/

MAX4520 are available in 6-pin SOT23 and 8-pin µMAX

packages.

Applications

Data Acquisition

Industrial and Process-Control Systems

Avionics

ATE Equipment

Redundant/Backup Systems

Features

♦ ±40V Fault Protection with Power Off

±36V Fault Protection with ±15V Supplies

♦ Switch is Off with Power Removed

♦ Rail-to-Rail Signal Handling

♦ 160Ω max Signal Paths with ±15V Supplies

♦ On-Switch Turns Off with Overvoltage

♦ 0.5nA Off-Leakage Current

♦ Output Clamped to Appropriate Supply Voltage

During Fault Condition; No Transition Glitch

♦ No Power-Supply Sequencing Required

♦ ±4.5V to ±20V Dual Supplies

+9V to +36V Single Supply

♦ Low Power Consumption: <2mW

♦ TTL- and CMOS-Compatible Logic Inputs with

Single +9V to +15V or ±15V Supplies

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,

SPST Analog Switches

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

( ) ARE FOR MAX4520.

NC (NO)

COM

V-

V+

MAX4510

MAX4520

GND

SWITCHES SHOWN FOR LOGIC "0" INPUT.

ALL SWITCHES ARE OFF WITH POWER REMOVED.

SOT23

19-1542; Rev 0; 10/99

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

Ordering Information

PART TEMP. RANGE

PIN-

PACKAGE

MAX4520EUT-T

-40°C to +85°C 6 SOT23-6

MAX4510EUT-T

-40°C to +85°C 6 SOT23-6

MAX4510EUA

-40°C to +85°C 8 µMAX

Pin Configurations continued at end of data sheet.

MAX4520EUA

-40°C to +85°C 8 µMAX

Pin Configurations/Truth Tables

IN MAX4510 MAX4520

0 ON OFF

1 OFF ON

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

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Summary of content (12 pages)

PAGE 1
9-1542; Rev 0; 10/99 Rail-to-Rail, Fault-Protected, SPST Analog Switches On-resistance is 160Ω max. The off-leakage current is only 0.5nA at +25°C and 10nA at +85°C. The MAX4510 is a normally closed switch, while the MAX4520 is a normally open switch. These CMOS switches operate with dual power supplies ranging from ±4.5V to ±20V or a single supply between +9V and +36V. The digital input has +0.8V and +2.
PAGE 2
MAX4510/MAX4520 Rail-to-Rail, Fault-Protected, SPST Analog Switches ABSOLUTE MAXIMUM RATINGS (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, IN (Note 1)..................................(V- - 0.3V) to (V+ + 0.3V) NC, NO (Note 2) .........................
PAGE 3
Rail-to-Rail, Fault-Protected, SPST Analog Switches (V+ = +15V, V- = -15V, VIH = 2.4V, VIL = 0.8V, GND = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER Clamp Output Resistance, Supplies On SYMBOL RCOM CONDITIONS VNO or VNC = ±36V Fault Trip Threshold TA MIN +25°C TYP 1 E +25°C MAX 2.5 3 V- - 0.4 V+ + 0.4 UNITS kΩ V Fault Output Turn-On Delay Time VIN = ±25V, RL = 10kΩ +25°C 10 ns Fault Recovery Time VIN = ±25V, RL = 10kΩ +25°C 2.
PAGE 4
MAX4510/MAX4520 Rail-to-Rail, Fault-Protected, SPST Analog Switches ELECTRICAL CHARACTERISTICS—Single +12V Supply (V+ = +12V, V- = 0, GND = 0, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
Rail-to-Rail, Fault-Protected, SPST Analog Switches (V+ = +12V, V- = 0, GND = 0, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 6
__________________________________________Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) SWITCH ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) 150 100 V+ = +15V V- = -15V 50 140 120 100 80 60 TA = +25°C TA = -40°C -10 -5 0 5 10 15 -10 -5 0 5 10 VCOM (V) VCOM (V) SWITCH ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) ID(ON), IS(OFF), AND ID(OFF) LEAKAGES vs.
PAGE 7
Rail-to-Rail, Fault-Protected, SPST Analog Switches LOGIC-LEVEL THRESHOLD vs. V+ FREQUENCY RESPONSE 2.5 -10 MAX4510/20 TOC11 MAX4511-10 0 ON LOSS -20 -30 2.0 LOSS (dB) LOGIC-LEVEL THRESHOLD (V) 3.0 1.5 -40 SS -50 F OF -60 LO -70 1.0 -80 -90 0.5 V+ = +15V V- = -15V -100 0 -110 0 5 10 15 20 25 30 35 V+ (V) PIN 1000 Overview of Traditional Fault-Protected Switches V+ Positive Supply Voltage Input 2 5 V- Negative Supply Voltage Input.
PAGE 8
MAX4510/MAX4520 Rail-to-Rail, Fault-Protected, SPST Analog Switches NORMALLY OPEN SWITCH CONSTRUCTION V+ P2 HIGH FAULT P1 COM NO (NC) N1 LOW FAULT ON IN GND N2 V-ESD DIODE NC SWITCH MAX4510 MAX4520 Figure 1. Functional Diagram Overview of MAX4510/MAX4520 The MAX4510/MAX4520 differ considerably from traditional fault-protection switches, with several advantages. First, they are constructed with two parallel FETs, allowing very low on-resistance when the switch is on.
PAGE 9
Rail-to-Rail, Fault-Protected, SPST Analog Switches Positive Fault Condition When the signal on NO (or NC) exceeds V+ by about 50mV, the high-fault comparator output is high, turning off FETs N1 and P1. This makes the NO (or NC) pin high impedance regardless of the switch state. If the switch state is “off,” all FETs are turned off and both NO (or NC) and COM are high impedance. If the switch state is “on,” FET P2 is turned on, sourcing current from V+ to COM.
PAGE 10
MAX4510/MAX4520 Rail-to-Rail, Fault-Protected, SPST Analog Switches Test Circuits/Timing Diagrams V+ V+ NO OR NC LOGIC INPUT VNO OR VNC t r < 20ns t f < 20ns +3V 50% 0V MAX4510 MAX4520 VIN IN t OFF VOUT COM VOUT GND 50Ω V- 2k 35pF SWITCH OUTPUT 0V 0.9 · V0UT 0.9 · VOUT t ON VLOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. V- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION. Figure 2.
PAGE 11
Rail-to-Rail, Fault-Protected, SPST Analog Switches V+ V+ NO OR NC MAX4510 MAX4520 IN VIN GND 1MHz CAPACITANCE ANALYZER COM V- VV- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION. Figure 4. COM, NO, and NC Capacitance V+ 10nF NETWORK ANALYZER V+ VIN 50Ω 50Ω COM MAX4510 MAX4520 VIN VOUT IN NO, NC V- GND MEAS REF 50Ω OFF-ISOLATION = 20log VOUT VIN ON-LOSS = 20log VOUT VIN 50Ω 10nF V- MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS.
PAGE 12
Pin Configurations/Functional Diagrams/Truth Tables (continued) COM 1 8 V+ COM 1 8 V+ N.C. 2 7 N.C. N.C. 2 7 N.C. NC 3 6 IN NO 3 6 IN GND 4 5 V- GND 4 5 V- MAX4510 µMAX µMAX N.C. = NOT CONNECTED SWITCHES SHOWN FOR LOGIC "0" INPUT. ALL SWITCHES ARE OFF WITH POWER REMOVED. MAX4520 IN MAX4510 MAX4520 0 ON OFF 1 OFF ON ________________________________________________________Package Information 6LSOT.