Datasheet

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General Description

The MAX4631/MAX4632/MAX4633 high-voltage, dual

analog switches are pin compatible with the industry-stan-

dard DG401/DG403/DG405. They upgrade the existing

devices with fault-protected inputs and Rail-to-Rail

signal

handling capabilities. The MAX4631/MAX4632/MAX4633’s

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

are protected from overvoltage faults up to 36V during

power-up or power-down. During a fault condition, these

terminals become open circuit and only nanoamperes of

leakage current flow from the source, yet the switch output

(COM_) continues to furnish up to 18mA of the appropri-

ate polarity supply voltage to the load. This ensures unam-

biguous rail-to-rail outputs when a fault begins and ends.

On-resistance is 85Ω (max) at +25°C and is matched

between switches to 6Ω (max). Off-leakage current is only

0.5nA at +25°C and 5nA at +85°C.

The MAX4631 has two NO single-pole/single-throw (SPST)

switches. The MAX4632 has two NO/NC single-pole/

double-throw (SPDT) switches. The MAX4633 has two NO

double-pole/single-throw (DPST) switches.

These CMOS switches operate with dual power supplies

ranging from ±4.5V to ±18V or a single supply between

+9V and +36V. All digital inputs have +0.8V and +2.4V

logic thresholds, ensuring both TTL- and CMOS-logic

compatibility when using ±15V or a single +12V supply.

Applications

ATE Equipment

Data Acquisition

Industrial and Process Control Systems

Avionics

Redundant/Backup Systems

Features

♦ Fault Protection

±40V with Power Off

±36V with ±15V Supplies (MAX4631/MAX4633)

±25V with ±15V Supplies (MAX4632)

♦ Rail-to-Rail Signal Handling

♦ No Power-Supply Sequencing Required

♦ All Switches Off with Power Off

♦ Output Clamped to Appropriate Supply Voltage

During Fault Condition; No Transition Glitch

♦ 85Ω (max) Signal Paths with ±15V Supplies

♦ ±4.5V to ±18V Dual Supplies

+9V to +36V Single Supply

♦ Low Power Consumption: <6mW

♦ Pin Compatible with Industry-Standard

DG401/DG403/DG405

♦ TTL- and CMOS-Logic Compatible Inputs with

Single +9V to +15V, or ±15V Supplies

MAX4631/MAX4632/MAX4633

Fault-Protected, High-Voltage,

Dual Analog Switches

________________________________________________________________

Maxim Integrated Products

19-1515; Rev 0; 7/99

Ordering Information

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

Pin Configurations appear at end of data sheet.

PART

MAX4631CSE

MAX4631CPE

MAX4631ESE -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 Narrow SO

16 Plastic DIP

16 Narrow SO

MAX4631EPE

MAX4631MJE

MAX4632CSE

0°C to +70°C

-55°C to +125°C

-40°C to +85°C 16 Plastic DIP

16 CERDIP

16 Narrow SO

MAX4632CPE

MAX4632ESE

MAX4632EPE -40°C to +85°C

-40°C to +85°C

0°C to +70°C 16 Plastic DIP

16 Narrow SO

16 Plastic DIP

MAX4632MJE

MAX4633CSE

MAX4633CPE 0°C to +70°C

0°C to +70°C

-55°C to +125°C 16 CERDIP

16 Narrow SO

16 Plastic DIP

MAX4633ESE

MAX4633EPE

MAX4633MJE -55°C to +125°C

-40°C to +85°C

-40°C to +85°C 16 Narrow SO

16 Plastic DIP

16 CERDIP

Summary of content (16 pages)

PAGE 1
9-1515; Rev 0; 7/99 Fault-Protected, High-Voltage, Dual Analog Switches Features The MAX4631/MAX4632/MAX4633 high-voltage, dual analog switches are pin compatible with the industry-standard DG401/DG403/DG405. They upgrade the existing devices with fault-protected inputs and Rail-to-Rail® signal handling capabilities. The MAX4631/MAX4632/MAX4633’s normally open (NO) and normally closed (NC) terminals are protected from overvoltage faults up to 36V during power-up or power-down.
PAGE 2
MAX4631/MAX4632/MAX4633 Fault-Protected, High-Voltage, Dual Analog Switches ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND) V+ ...........................................................................-0.3V to +44V V- ............................................................................-44V to +0.3V V+ to V-...................................................................-0.3V to +44V COM_, IN_ (Note 1) ..............................(V- - 0.3V) to (V+ + 0.3V) NC_, NO_ (Note 2) MAX4631_ _E .
PAGE 3
Fault-Protected, High-Voltage, Dual Analog Switches (V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX4631/MAX4632/MAX4633 Fault-Protected, High-Voltage, Dual Analog Switches ELECTRICAL CHARACTERISTICS—Dual Supplies (continued) (V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
Fault-Protected, High-Voltage, Dual Analog Switches (V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 6
ELECTRICAL CHARACTERISTICS—Single Supply (continued) (V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 7
Fault-Protected, High-Voltage, Dual Analog Switches LOGIC-LEVEL THRESHOLD vs. V+ 150 130 110 90 TA = -40°C TA = -55°C 50 2 4 6 8 10 2.0 1.8 1.6 40 20 1.0 5 10 250 15 25 30 35 40 -55 -35 -15 I+ (µA) IGND 8 -10 -20 -30 12 14 0 16 20 10 12 14 450 400 DUAL SUPPLIES V+ = +15V V- = -15V 10 5 SINGLE SUPPLY V+ = +12V -5 250 200 NO_ tON -15 -10 -5 0 VCOM (V) 5 10 15 -80 -110 -120 -100 -120 0.
PAGE 8
Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) ON/OFF TIME vs. TEMPERATURE LEAKAGE CURRENT vs. TEMPERATURE 1 0.1 0.01 -55 -35 -15 5 25 45 65 MAX4631-33 toc14 150 130 tON 110 tOFF 90 70 50 -55 -35 -15 85 105 125 5 INPUT OVERVOLTAGE vs.
PAGE 9
Fault-Protected, High-Voltage, Dual Analog Switches -15V input voltage sensors. The simplified structure is shown in Figure 1. The parallel N1 and P1 MOSFETs form the switch element. N3 and P3 are sensor elements to sample the input voltage and compare it against the powersupply rails. COMPARATOR N3 N-CHANNEL DRIVER SENSE SWITCH -V (-15V) CLAMP N2 NC_ or INPUT NO_ N1 P1 P3 OUTPUT COM_ CLAMP P2 SENSE SWITCH +V (+15V) +15V +15V P-CHANNEL DRIVER COMPARATOR Figure 1.
PAGE 10
MAX4631/MAX4632/MAX4633 Fault-Protected, High-Voltage, Dual Analog Switches Table 1.
PAGE 11
Fault-Protected, High-Voltage, Dual Analog Switches attenuation. At 10MHz, off-isolation is about -46dB in 50Ω systems, declining (approximately 20dB per decade) as frequency increases. Higher circuit impedance also diminishes off-isolation. Adjacent channel attenuation is about 3dB above that of a bare IC socket and is due entirely to capacitive coupling.
PAGE 12
MAX4631/MAX4632/MAX4633 Fault-Protected, High-Voltage, Dual Analog Switches Test Circuits/Timing Diagrams (continued) V+ VIN_ V+ V+ IN_ 50Ω NO_ OR NC_ VIN_ 0V MAX4631 MAX4632 MAX4633 VOUT COM_ GND ∆ VOUT VOUT CL 100pF V- V- ∆ VOUT IS THE MEASURED VOLTAGE DUE TO CHARGETRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = ∆ VOUT • CL V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 4.
PAGE 13
Fault-Protected, High-Voltage, Dual Analog Switches V+ 10nF NETWORK ANALYZER V+ 50Ω VIN 50Ω COM_ ADDRESS SELECT MAX4631 MAX4632 MAX4633 IN_ VOUT NO_, NC_ MEAS. V- GND OFF-ISOLATION = 20 log VOUT VIN ON-LOSS = 20 log VOUT VIN REF. 50Ω 50Ω 10nF V- MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND “OFF” NO_ OR NC_ TERMINALS. ON LOSS IS MEASURED BETWEEN COM_ AND “ON” NO_ OR NC_ TERMINALS.
PAGE 14
Fault-Protected, High-Voltage, Dual Analog Switches MAX4631/MAX4632/MAX4633 Pin Configurations/Functional Diagrams/Truth Tables TOP VIEW COM1 1 16 NO1 COM1 1 N.C. 2 N.C. 2 15 IN1 N.C. 3 14 V- N.C. 4 13 GND NC3 4 12 N.C. NC4 5 N.C. 5 MAX4631 N.C. 6 11 V+ N.C. 7 10 IN2 COM2 8 9 NO2 14 V- COM1 1 16 NO1 N.C. 2 15 IN1 COM3 3 14 V- 13 GND NO3 4 13 GND MAX4632 12 N.C. NO4 5 MAX4633 12 N.C. COM4 6 11 V+ N.C. 7 10 IN2 COM2 8 9 NO2 COM4 6 11 V+ N.C.
PAGE 15
Fault-Protected, High-Voltage, Dual Analog Switches SOICN.
PAGE 16
Fault-Protected, High-Voltage, Dual Analog Switches PDIPN.EPS MAX4631/MAX4632/MAX4633 Package Information (continued) 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.