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Analog Devices Inc./Maxim Integrated MAX16040PLA31+T
- Part No.:
- MAX16040PLA31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16040PLA31+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,666
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Product details
Overview
The MAX16040PLA31+T from Maxim Integrated is an 8-pin μDFN battery-backup supervisory IC for microprocessor systems, featuring auxiliary adjustable-reset input (RESETIN), active-low open-drain reset output, power-fail comparator with 1.235V threshold, and battery switchover with <2µA backup current at +25°C. It operates from 1.2V to 5.5V supply and supports critical brownout protection in portable POS terminals and real-time clock backup circuits.
For engineers reviewing the MAX16040PLA31+T datasheet, MAX16040PLA31+T pinout, MAX16040PLA31+T application, or MAX16040PLA31+T equivalent, key selection criteria include its 3.08V factory-set reset threshold (L31 suffix), 8-pin μDFN-8 package, RESETIN comparator accuracy (±50mV over -40°C to +85°C), and guaranteed 140ms minimum reset timeout period - all validated per Maxim's 19-0882 Rev 2 specification.
Technical Context
The MAX16040PLA31+T implements a dedicated RESETIN comparator referenced to a precision 1.235V internal bandgap, enabling user-configurable monitoring of secondary power rails via external resistor dividers. Its open-drain RESET output supports wired-OR configurations and level-shifting, while the PFI/PFO pair provides independent power-fail detection decoupled from VCC reset logic.
This variant belongs to the MAX16033–MAX16040 family's 8-pin μDFN configuration and excludes manual-reset (MR), watchdog (WDI), chip-enable gating (CEIN/CEOUT), and BATTON functions - confirmed by pin mapping and ordering table. It shares the same 2mm × 2mm footprint, -40°C to +85°C operating range, and 13µA typical quiescent current as other 8-pin members.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.00V (min) to 3.15V (max) - factory-trimmed L31 code ensures ±3.5% tolerance for 3.3V system monitoring. |
| RESET Output Type | Active-low open-drain - requires external pull-up; enables shared reset bus and voltage-level translation. |
| RESET Timeout Period | 140ms (min) - guarantees sufficient processor initialization time after VCC recovery. |
| RESETIN Threshold | 1.185V to 1.285V - precise 1.235V reference allows accurate secondary supply monitoring with <25nA input bias. |
| Quiescent Supply Current | 13µA (typ) at VCC = 2.8V - enables multi-year operation on coin-cell backup without significant drain. |
| Operating Temperature | -40°C to +85°C - fully specified for industrial and embedded applications without derating. |
| Package | 2mm × 2mm, 8-pin μDFN - surface-mount footprint compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
Package: 2mm × 2mm, 8-pin μDFN (exposed pad), RoHS-compliant, tape-and-reel (T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; asserts low when VCC < VTH, RESETIN < 1.235V, or during power fail; requires external pull-up. |
| 2 | PFI | Power-fail input; monitors external voltage divider; triggers PFO when voltage falls below 1.235V. |
| 3 | GND | Ground reference for all analog and digital circuitry; connects to PCB ground plane. |
| 4 | RESETIN | Auxiliary reset input; comparator input referenced to 1.235V; used to monitor secondary supply rail. |
| 5 | PFO | Active-low open-drain power-fail output; asserts low when PFI < 1.235V or VCC < VTH. |
| 6 | VCC | Main supply input (1.2V–5.5V); powers internal circuitry and sources OUT during normal operation. |
| 7 | OUT | Output node; sourced from VCC when VCC > VTH, or from BATT during backup mode; drives SRAM or RTC. |
| 8 | BATT | Backup battery input; automatically engages when VCC falls below VTH and VBATT > VCC + 40mV. |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESETIN comparator | 1.235V precision reference with ±50mV max threshold error over temperature enables reliable secondary supply monitoring. |
| Low-power backup mode | <2µA battery standby current at +25°C preserves coin-cell life for >10 years in RTC applications. |
| Open-drain RESET/PFO outputs | Supports flexible reset bus architecture, level shifting, and wired-OR fault signaling without contention. |
| Factory-trimmed reset threshold | L31 code delivers 3.08V nominal VTH with tight 3.00V–3.15V min/max window for stable 3.3V system supervision. |
| Robust transient immunity | Withstands VCC glitches down to 1.2V and rejects transients ≤25µs (at 100mV overdrive), preventing false resets. |
Applications
| POS Terminal Battery Backup | Real-Time Clock Supervision |
|---|---|
Use Scenario: Maintains SRAM data and RTC time during AC power loss or battery swap in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Provides automatic VCC-to-BATT switchover, RESET assertion during brownout, and RESETIN monitoring of backup rail integrity. Use Value: Guarantees zero data loss with <2µA backup current and 140ms reset hold time, eliminating need for external supervisor logic. |
Use Scenario: Ensures continuous timekeeping and calendar functionality in embedded systems during main power interruption. IC Role / Device Role / Timing Role: Acts as primary power supervisor for RTC ICs, asserting RESET only when VCC drops below 3.08V and holding for ≥140ms. Use Value: Factory-trimmed 3.08V threshold matches standard 3.3V RTC supply tolerances, reducing BOM count vs. discrete solutions. |
| Industrial Controller Brownout Protection | Set-Top Box Power Sequencing |
Use Scenario: Prevents firmware corruption during undervoltage events in programmable logic controllers operating in harsh environments. IC Role / Device Role / Timing Role: Monitors main 3.3V rail via VCC and secondary 5V rail via RESETIN, asserting RESET on either fault condition. Use Value: Dual-rail supervision capability eliminates need for second supervisor IC, saving board space and cost. |
Use Scenario: Coordinates safe shutdown and state retention during power cycling in consumer media devices. IC Role / Device Role / Timing Role: Generates synchronized RESET and PFO signals to halt CPU execution and trigger EEPROM save before power collapse. Use Value: Open-drain outputs allow direct connection to multiple SoC reset inputs without level-shifter components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16036PLA31+T | 10-pin μDFN package; includes CEIN/CEOUT chip-enable gating not present in MAX16040PLA31+T. | Suitable for systems requiring memory write-protection during brownout; adds 2 pins and larger footprint. | Select when CE gating is required; otherwise MAX16040PLA31+T offers identical supervision with smaller 8-pin layout. |
| TPS3808G33DBVR | TI device with 3.3V fixed reset threshold, push-pull RESET, no RESETIN input, and 1.8µA quiescent current. | Lacks auxiliary voltage monitoring; optimized for single-rail 3.3V systems without secondary supply supervision. | Choose for lowest power and simpler design where RESETIN functionality is unnecessary. |
Compared with MAX16036PLA31+T, the MAX16040PLA31+T saves board area with its 8-pin μDFN and removes unused CE gating; versus TPS3808G33DBVR, it adds critical RESETIN capability for dual-rail monitoring but consumes slightly higher quiescent current.
Availability
MAX16040PLA31+T is available at Aetrix Electronics and suitable for portable POS terminals, real-time clock backup systems, industrial controllers, and set-top box power sequencing requiring stable component supply and long-term lifecycle support.
Supply support for MAX16040PLA31+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) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications across industrial, computing, and communications markets.
The MAX16033–MAX16040 product line delivers ultra-low-power, small-footprint supervisory circuits for battery-backed memory and microprocessor systems - specifically engineered to replace discrete reset solutions in space-constrained, reliability-critical applications.
FAQ
What is the factory-set reset threshold voltage for MAX16040PLA31+T?
The MAX16040PLA31+T features a factory-trimmed reset threshold denoted by the "L31" suffix, specifying a nominal 3.08V with a guaranteed range of 3.00V to 3.15V at -40°C to +85°C. This value is laser-trimmed during production and does not require external resistor programming - unlike the RESETIN input, which uses an external divider for user-defined thresholds.
Does MAX16040PLA31+T support battery backup functionality?
Yes, the MAX16040PLA31+T supports automatic battery switchover: when VCC falls below its 3.08V reset threshold and VBATT exceeds VCC by at least 40mV, the internal MOSFET connects BATT to OUT. In this mode, battery supply current is <2µA at +25°C (excluding load), enabling multi-year operation on standard coin cells for SRAM or RTC backup.
What is the function of the RESETIN pin on MAX16040PLA31+T?
The RESETIN pin on MAX16040PLA31+T is a dedicated comparator input referenced to an internal 1.235V precision bandgap. When the voltage at RESETIN falls below 1.235V, the device asserts RESET. This allows monitoring of a secondary power rail (e.g., 5V or 12V) using an external resistor divider - a feature absent in most basic supervisors and critical for dual-rail system reliability.
What package type and dimensions does MAX16040PLA31+T use?
The MAX16040PLA31+T is housed in a 2mm × 2mm, 8-pin μDFN package with exposed thermal pad (pin count confirmed in Maxim's ordering table and pin description). This RoHS-compliant, surface-mount package supports fine-pitch reflow assembly and provides superior thermal performance versus SOIC alternatives - essential for compact, thermally constrained designs.
How does the open-drain RESET output of MAX16040PLA31+T operate?
The MAX16040PLA31+T's RESET pin is an active-low open-drain output requiring an external pull-up resistor. It sinks up to 20mA when asserted and exhibits <0.4V VOL at 100µA sink current. This architecture enables wired-OR reset buses, level translation across voltage domains, and compatibility with processors requiring open-drain reset inputs - unlike push-pull variants such as MAX16033LLA31+T.
MAX16040PLA31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µDFN (2x2)
MAX16040PLA31+T FAQ
1.How can I place an order for MAX16040PLA31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16040PLA31+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 MAX16040PLA31+T reliable?
The price and inventory of MAX16040PLA31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16040PLA31+T is usually 5 days.
3.What payment methods are accepted for MAX16040PLA31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16040PLA31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16040PLA31+T?
MAX16040PLA31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16040PLA31+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 MAX16040PLA31+T?
For technical support, including MAX16040PLA31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16040PLA31+T requirements.
6.How does Aetrix verify that MAX16040PLA31+T is sourced from the original manufacturer or authorized distributors?
All MAX16040PLA31+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 MAX16040PLA31+T meets industry standards.
7.What is the process for return or replacement of MAX16040PLA31+T?
All MAX16040PLA31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16040PLA31+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 MAX16040PLA31+T part is unused and in its original packaging.
Return procedure for MAX16040PLA31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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