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Analog Devices Inc./Maxim Integrated MAX31963AUM+T
- Part No.:
- MAX31963AUM+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Serializers, Deserializers
- Package:
- 48-TFSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
MAX31963AUM+T.pdf
- Description:
- IC SERIALIZER SPI 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,362
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Product details
Overview
The MAX31963AUM+T from Maxim Integrated is an octal industrial digital input IC with galvanically isolated SPI interface, translating eight 12V/24V/48V current-sinking field inputs into a 3V–5.5V logic-compatible serial stream. It integrates a 500VRMS isolation barrier, configurable IEC 61131-2 Type 1/2/3 input compliance, 0.5–6mA programmable input current limiting, and a high-efficiency buck regulator (7–36V input, 5V output) for direct field-side power. It is used in PLC backplane modules requiring robust noise immunity and daisy-chain capability.
For engineers reviewing the MAX31963AUM+T datasheet, MAX31963AUM+T pinout, MAX31963AUM+T application, or MAX31963AUM+T equivalent, key selection criteria include its 500VRMS certified isolation, 2µs update rate, ±15kV HBM ESD on IN1–IN8, 48-pin TSSOP package with 1.4mm creepage/clearance, and buck regulator efficiency (82% at 24V/50mA).
Technical Context
The MAX31963AUM+T implements dual-domain operation: field-side (GNDF-referenced) handles 24V/48V inputs via current-limiting circuitry and energyless LED drivers, while logic-side (GNDL-referenced) provides SPI communication with 3.3V/5V microcontrollers. Its isolation barrier uses capacitive coupling certified to 500VRMS for 60s, with 12pF inter-side capacitance and 1.5kV/µs common-mode transient immunity.
Input conditioning includes programmable debounce (0/25µs/0.75ms/3ms), configurable IEC 61131-2 thresholds via external RIREF (15kΩ nominal), and integrated fault monitoring (VDD24F UV1/UV2 alarms, overtemperature detection at 155°C with 7°C hysteresis). The buck regulator (469kHz switching frequency, 68µH inductor) enables direct operation from 24V field supplies without external DC/DC converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 500VRMS for 60s; enables safe interfacing between hazardous field voltages and low-voltage control logic in industrial environments. |
| Input Channels | 8 independent current-sinking inputs; supports 12V/24V/48V systems with 2.2kΩ series resistors for IEC 61131-2 Type 1/3 compliance. |
| Buck Regulator | Integrated 469kHz buck converter (7–36V input → 5V/50mA output); eliminates need for external DC/DC, reduces heat vs. LDO-based alternatives. |
| Update Rate | 2µs per channel; ensures real-time response for fast-acting industrial sensors and safety-critical monitoring. |
| ESD Immunity | ±15kV HBM on IN1–IN8 pins; protects against electrostatic discharge during field wiring and maintenance. |
| Operating Temp | −40°C to +125°C ambient; qualified for extended deployment in uncontrolled industrial enclosures and outdoor control cabinets. |
| SPI Interface | 8-bit or 16-bit (with CRC/status) output; MODESEL pin selects format; compatible with 3.3V or 5V logic-level microcontrollers. |
Pinout & Package
Package: 48-pin TSSOP (0.25mm pitch, 1.4mm creepage/clearance), exposed pad (EP) for thermal management, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1–IN8 | Field Input Terminals | Current-sinking inputs accepting 12V/24V/48V signals; require 2.2kΩ series resistor for IEC 61131-2 compliance. |
| LED1–LED8 | Energyless LED Driver Outputs | Divert input current to drive indicator LEDs without increasing total power dissipation; connect to GNDF if unused. |
| VDD24F / VDD5F | Field-Side Power Inputs | VDD24F accepts 7–36V for buck regulation; VDD5F is regulated 5V output or external 5V supply input when bypassing regulator. |
| LX | Buck Regulator Switch Node | Connects to 68µH inductor; critical for buck converter operation-only present on MAX31963 (N.C. on MAX31953). |
| DB0L/DB1L & DB0F/DB1F | Daisy-Chain Debounce Control | Logic-side inputs and isolated outputs that configure identical debounce timing across all 8 channels (0/25µs/0.75ms/3ms). |
| CS/CLK/DOUT/FAULT | SPI Interface & Fault Indicator | Standard SPI signals (CS active-low, 10MHz max clock); FAULT pin asserts high on UV1 alarm or overtemperature. |
| IREF | Current-Limit Reference | Connect 15kΩ resistor to GNDF to set 2.4mA nominal input current limit (range: 0.5–6mA via RIREF = 36/IIN). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Buck Regulator | Replaces external DC/DC converters; achieves 82% efficiency at 24V/50mA, reducing board heat and component count. |
| Configurable IEC 61131-2 Compliance | Supports Type 1, 2, and 3 digital inputs via software-selectable thresholds and external RIREF, enabling reuse across diverse sensor types. |
| Daisy-Chain Capability | Eliminates need for additional isolators by cascading DINF→CLKO→CSO signals across multiple MAX31963 devices on same backplane. |
| 5-Bit CRC Error Detection | Appends CRC to 16-bit SPI frame (when MODESEL = low), enabling host µC to detect transmission errors in noisy industrial environments. |
| Field-Supply Voltage Monitors | Dual UV alarms (UV1 at 7–8V, UV2 at 14–15.7V) provide early warning of failing 24V rails before functional loss occurs. |
| Energyless LED Drivers | Redirects input current to LEDx pins instead of dissipating as heat, enabling visual status indication without added power budget. |
Applications
| Programmable Logic Controller (PLC) Input Modules | Industrial Safety Monitoring Systems |
|---|---|
Use Scenario: 24V discrete sensor inputs (e.g., emergency stop buttons, door interlocks) connected to modular PLC backplanes. IC Role / Device Role / Timing Role: Isolated digital input translator with 2µs update rate and ±15kV ESD protection on field pins. Use Value: Enables direct connection of ruggedized field wiring without external isolators or level shifters, reducing BOM cost and layout area. |
Use Scenario: Redundant input monitoring in SIL2-certifiable machinery controls where signal integrity and fault reporting are critical. IC Role / Device Role / Timing Role: Fault-aware digital input with UV1/UV2 alarms, overtemperature shutdown, and CRC-protected SPI output. Use Value: Provides diagnostic visibility (via FAULT pin and SPI status flags) to support fail-safe system responses and predictive maintenance. |
| Process Automation I/O Cards | Building Management System (BMS) Controllers |
Use Scenario: Distributed I/O cards in chemical plant control rooms receiving 48V proximity switch signals over long cable runs. IC Role / Device Role / Timing Role: High-voltage tolerant input conditioner with 1.4mm creepage, 500VRMS isolation, and programmable debounce. Use Value: Maintains signal fidelity despite induced noise on multi-meter cables, eliminating false triggers in mission-critical process loops. |
Use Scenario: HVAC controller modules collecting occupancy, temperature, and valve position feedback from 24V building sensors. IC Role / Device Role / Timing Role: Low-power, thermally robust digital input with buck regulator enabling direct 24V rail powering. Use Value: Eliminates need for separate 5V field-side supply, simplifying power architecture and improving reliability in space-constrained panels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar industrial digital input applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31953AUM+ | Replaces buck regulator with linear LDO; higher power dissipation at 24V input; no LX pin; same pinout and SPI interface. | Better suited for low-current, space-constrained designs where thermal headroom exists and efficiency is secondary. | Select MAX31953AUM+ only when field supply is stable 7–36V and thermal design cannot accommodate buck inductor. |
| TI ISO1211DR | Single-channel isolated input; requires external MCU for multiplexing; no integrated regulator or debounce; 2500VRMS isolation. | Used in highly distributed architectures where per-channel isolation and minimal footprint outweigh integration benefits. | Choose ISO1211DR when designing custom ASIC/FPGA-based I/O with tight PCB area constraints and existing 5V field supply. |
Compared with MAX31953AUM+, the MAX31963AUM+ delivers 82% buck efficiency versus LDO dropout losses-critical for 24V-powered modules in sealed enclosures. Versus ISO1211DR, it offers full octal integration, daisy-chain capability, and embedded diagnostics, reducing firmware complexity and board layer count.
Availability
The MAX31963AUM+T is available at Aetrix Electronics and suitable for programmable logic controllers, industrial safety monitoring systems, and process automation I/O cards requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for MAX31963AUM+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX31963AUM+T belongs to Maxim's industrial digital input product line, designed specifically to replace discrete optocoupler-based input modules with fully integrated, isolated, and diagnostic-capable solutions for PLC and factory automation equipment.
FAQ
What is the maximum field voltage supported by the MAX31963AUM+T?
The MAX31963AUM+T supports field input voltages up to +45V relative to GNDF, with absolute maximum rating of −0.3V to +45V on IN1–IN8. When using a 2.2kΩ series resistor, it complies with IEC 61131-2 Type 1 and Type 3 thresholds for 12V, 24V, and 48V systems. The MAX31963AUM+T also tolerates −45V to +45V on IN1–IN8 with the 2.2kΩ resistor in place.
Does the MAX31963AUM+T require an external inductor?
Yes-the MAX31963AUM+T requires an external 68µH inductor connected between the LX pin and VDD5F to operate its integrated buck regulator. This is mandatory when powering the field side from 7–36V. The MAX31963AUM+T datasheet specifies inductor part number SD3814-680R and recommends pairing it with a 10µF + 0.1µF capacitor from VDD5F to GNDF.
How does the MAX31963AUM+T handle input debouncing?
The MAX31963AUM+T implements a digital glitch filter with four selectable time constants (0, 25µs, 0.75ms, or 3ms) controlled by DB0L/DB1L pins. It checks input stability for three consecutive clock cycles (clock period = 1/3 of selected time constant) before updating the internal latch. This ensures noise rejection without analog RC components or firmware overhead.
Can the MAX31963AUM+T be powered directly from a 5V supply?
Yes-the MAX31963AUM+T supports direct 5V powering by connecting VDD24F to VDD5F and applying 4.5–5.5V to VDD5F. In this mode, the buck regulator is disabled, UV1/UV2 alarms assert (FAULT pin activates), but core input functionality, SPI interface, and temperature monitoring remain fully operational.
What is the purpose of the IREF pin on the MAX31963AUM+T?
The IREF pin on the MAX31963AUM+T sets the input current limit for all eight channels via an external resistor to GNDF. With a 15kΩ resistor, it configures a nominal 2.4mA input current (IIN = 36/RIREF), enabling compliance with IEC 61131-2 standards. Adjusting RIREF from 4.99kΩ to 62kΩ scales the limit from 0.5mA to 6mA without changing threshold voltages.
MAX31963AUM+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Serializer
- Data Rate:
- 200kHz
- Input Type:
- Digital
- Output Type:
- Serial
- Number of Inputs:
- 8
- Number of Outputs:
- 1
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
MAX31963AUM+T FAQ
1.How can I place an order for MAX31963AUM+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX31963AUM+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX31963AUM+T reliable?
The price and inventory of MAX31963AUM+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX31963AUM+T is usually 5 days.
3.What payment methods are accepted for MAX31963AUM+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX31963AUM+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX31963AUM+T?
MAX31963AUM+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX31963AUM+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX31963AUM+T?
For technical support, including MAX31963AUM+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX31963AUM+T requirements.
6.How does Aetrix verify that MAX31963AUM+T is sourced from the original manufacturer or authorized distributors?
All MAX31963AUM+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX31963AUM+T meets industry standards.
7.What is the process for return or replacement of MAX31963AUM+T?
All MAX31963AUM+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX31963AUM+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX31963AUM+T part is unused and in its original packaging.
Return procedure for MAX31963AUM+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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