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Analog Devices Inc./Maxim Integrated MAX16040LLA31+T
- Part No.:
- MAX16040LLA31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16040LLA31+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,432
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Product details
Overview
The MAX16040LLA31+T from Maxim Integrated is a low-power, 8-pin μDFN supervisory circuit designed for battery-backed SRAM power management in microprocessor systems. It provides auxiliary adjustable-reset input (RESETIN), active-low push-pull reset output, independent power-fail comparator, and backup-battery switchover with 40mV hysteresis. It operates from 1.2V to 5.5V supply, features 3.08V factory-set reset threshold, and supports -40°C to +85°C industrial temperature range.
For engineers reviewing the MAX16040LLA31+T datasheet, MAX16040LLA31+T pinout, MAX16040LLA31+T application, or MAX16040LLA31+T equivalent, key selection criteria include its RESETIN comparator threshold (1.235V), battery-switchover behavior, push-pull reset structure, quiescent current (13µA at 2.8V), and compatibility with 2.5V/3.0V/3.3V/5.0V supply monitoring.
Technical Context
The MAX16040LLA31+T implements a precision 1.235V internal reference for its RESETIN comparator, enabling user-adjustable secondary supply monitoring via external resistor divider. Its reset generator asserts active-low RESET for ≥140ms after VCC rises above 3.08V or after RESETIN recovers from below 1.235V.
It integrates a dedicated battery switchover MOSFET with VCC-to-OUT on-resistance of 4.6Ω (at 2.5V, 25mA) and BATT-to-OUT on-resistance <5Ω across temperature. The device disables CE gating (not present in 8-pin variant) and omits MR, WDI, and BATTON functions - confirming its role as the RESETIN-equipped member of the MAX16033–MAX16040 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00V to 3.15V (factory-set L31 code); ensures reliable reset assertion during 3.3V supply brownout |
| RESET Output Type | Active-low push-pull; drives low without external pull-up, supports direct µP reset input connection |
| RESET Timeout Period | 140ms minimum; guarantees µP initialization completes before release from reset |
| RESETIN Threshold | 1.235V ±50mV; enables precise monitoring of secondary supplies using external resistive divider |
| Quiescent Supply Current | 13µA at VCC = 2.8V; minimizes standby power draw in battery-critical portable applications |
| Operating Voltage Range | 1.2V to 5.5V; supports operation down to single-cell Li-ion or coin-cell backup voltage levels |
| Package | 2mm × 2mm, 8-pin μDFN; enables high-density PCB layout in space-constrained embedded modules |
Pinout & Package
MAX16040LLA31+T is housed in a thermally enhanced, lead(Pb)-free 2mm × 2mm, 8-pin μDFN package (pin pitch: 0.5mm), fully specified from -40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Push-pull driver; asserts low when VCC < 3.08V, RESETIN < 1.235V, or during power-up; holds low ≥140ms after recovery |
| 2 - PFI | Power-fail input | Monitors external supply via resistor divider; trips PFO when voltage falls below 1.235V |
| 3 - GND | Ground reference | Common return path for all analog and digital circuitry; must be low-impedance connection |
| 4 - RESETIN | Auxiliary reset input | User-adjustable comparator input; asserts RESET when voltage drops below 1.235V (±50mV) |
| 5 - PFO | Active-low power-fail output | Push-pull output; goes low when PFI < 1.235V or VCC < reset threshold; signals early power failure |
| 6 - VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation |
| 7 - OUT | Power output | Sources from VCC when valid; switches to BATT when VCC < reset threshold and VCC < VBATT (40mV hysteresis) |
| 8 - BATT | Battery backup input | Connects to backup source (e.g., coin cell); supplies OUT during VCC brownout; draws ≤2µA in backup mode |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESETIN comparator | 1.235V precision reference enables accurate monitoring of secondary rails (e.g., 2.5V, 1.8V) with external R-divider |
| Low 13µA quiescent current | Extends battery life in always-on portable equipment; measured at VCC = 2.8V, TA = +25°C |
| 40mV switchover hysteresis | Prevents oscillation during slow VCC decay; ensures clean, glitch-free transition between VCC and BATT power paths |
| Active-low push-pull RESET | Eliminates need for external pull-up resistor; reduces BOM count and improves noise immunity on reset line |
| Independent PFI/PFO comparator | Provides early power-fail warning (≥100µs before VCC dropout) without affecting main reset timing |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose monitors and ECG patches retain SRAM data during brief battery replacement or low-voltage events. IC Role / Device Role / Timing Role: MAX16040LLA31+T acts as power supervisor and battery switchover controller, asserting RESET and switching OUT to BATT within microseconds of VCC dip. Use Value: Prevents SRAM corruption during 100–500ms battery swap windows; 13µA quiescent current extends 3V coin-cell life beyond 5 years. | Use Scenario: Remote I/O nodes in factory automation require deterministic reset behavior during 24VDC supply transients. IC Role / Device Role / Timing Role: MAX16040LLA31+T monitors both primary 5V logic rail and isolated 3.3V sensor rail via RESETIN, triggering coordinated reset on either fault. Use Value: Dual-rail supervision eliminates need for separate supervisors; 1.235V RESETIN threshold enables accurate 3.3V monitoring with <1% error using 1% resistors. |
| Smart Meter Data Loggers | POS Terminal Real-Time Clock Backup |
Use Scenario: Electricity meters log consumption data to nonvolatile SRAM during mains outage, relying on supercapacitor backup. IC Role / Device Role / Timing Role: MAX16040LLA31+T controls switchover from 3.3V regulated supply to 5.5V supercap, while RESETIN monitors supercap voltage decay. Use Value: 40mV hysteresis prevents chattering during supercap discharge; BATT-to-OUT on-resistance <5Ω ensures >95% voltage retention at 10mA load. | Use Scenario: Point-of-sale terminals maintain RTC time and transaction logs during AC power loss using coin-cell backup. IC Role / Device Role / Timing Role: MAX16040LLA31+T serves as RTC power manager, asserting RESET to halt processor activity and switching OUT to BATT to sustain RTC/SRAM. Use Value: Factory-set 3.08V reset threshold matches 3.3V supply tolerance; 2µA max battery drain at -40°C preserves 10-year coin-cell shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16036LLA31+T | Same 8-pin μDFN package, identical RESETIN function and 3.08V reset threshold, but open-drain RESET output | Requires external pull-up resistor; less suitable for noise-sensitive µP reset inputs without added filtering | Select MAX16036LLA31+T only if system-level pull-up already exists or open-drain flexibility is required for wired-OR reset buses |
| TPS3808G33DBVR | 3.3V fixed reset threshold, 350ms timeout, 2.9µA quiescent current, SOT-23-6 package | Lacks RESETIN input, battery switchover, and PFI/PFO; limited to basic reset-only applications | Choose TPS3808G33DBVR for cost-sensitive, space-constrained designs where auxiliary monitoring and backup control are unnecessary |
Compared with MAX16036LLA31+T, the MAX16040LLA31+T offers push-pull RESET for lower system noise susceptibility; compared with TPS3808G33DBVR, it adds critical battery switchover and dual-supply monitoring - making it indispensable for SRAM-retention systems requiring robust power sequencing.
Availability
MAX16040LLA31+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter data loggers, and POS terminal real-time clock backup requiring stable component supply and long-term industrial temperature support.
Supply support for MAX16040LLA31+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 connectivity in demanding industrial and automotive environments.
The MAX16033–MAX16040 product line delivers integrated battery-backup supervisory circuits optimized for SRAM retention in space- and power-constrained µP systems, emphasizing low quiescent current, accurate voltage thresholds, and seamless power-path switchover.
FAQ
What is the factory-set reset threshold voltage for MAX16040LLA31+T?
The MAX16040LLA31+T has a factory-set reset threshold of 3.00V to 3.15V (typical 3.08V), denoted by the "L31" suffix in the part number. This threshold is laser-trimmed during production and guaranteed over -40°C to +85°C. It is specifically calibrated for reliable supervision of 3.3V power rails during brownout conditions, with ±7mV accuracy across temperature.
Does MAX16040LLA31+T support battery switchover, and what is the switchover hysteresis?
Yes, MAX16040LLA31+T supports automatic battery switchover: when VCC falls below the reset threshold and VCC is at least 40mV lower than VBATT, the internal MOSFET connects BATT to OUT. The 40mV hysteresis prevents oscillation during slow VCC decay. In battery-backup mode, MAX16040LLA31+T draws ≤2µA from BATT (at TA = +25°C), ensuring multi-year coin-cell operation.
What is the function of the RESETIN pin on MAX16040LLA31+T, and how is its threshold set?
The RESETIN pin on MAX16040LLA31+T is an auxiliary comparator input with a fixed 1.235V internal reference. When the voltage at RESETIN falls below 1.235V, MAX16040LLA31+T asserts RESET. Users set the trip point for a secondary supply (e.g., 2.5V) using an external resistor divider: VRTH = 1.235V × (R1/R2 + 1). Input bias current is ≤25nA, allowing use of MΩ-range resistors without accuracy loss.
What package type and footprint does MAX16040LLA31+T use, and are thermal pads supported?
MAX16040LLA31+T uses a 2mm × 2mm, 8-pin μDFN package with 0.5mm pin pitch and exposed thermal pad (EP). The EP must be soldered to a PCB thermal plane for optimal power dissipation and junction temperature control. Absolute maximum junction temperature is +150°C; continuous power dissipation at TA = +70°C is 380.6mW, derating 4.8mW/°C above that.
How does the power-fail comparator (PFI/PFO) operate independently of the main reset function in MAX16040LLA31+T?
The PFI/PFO comparator in MAX16040LLA31+T operates independently: PFO asserts low when PFI voltage falls below 1.235V, regardless of VCC level - providing early warning before main reset triggers. However, if VCC drops below the 3.08V reset threshold, PFO is forced low regardless of PFI state. This dual-mode behavior allows flexible system-level fault handling: PFO can drive an interrupt line while RESET handles full µP reset sequencing.
MAX16040LLA31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- 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)
MAX16040LLA31+T FAQ
1.How can I place an order for MAX16040LLA31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16040LLA31+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 MAX16040LLA31+T reliable?
The price and inventory of MAX16040LLA31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16040LLA31+T is usually 5 days.
3.What payment methods are accepted for MAX16040LLA31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16040LLA31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16040LLA31+T?
MAX16040LLA31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16040LLA31+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 MAX16040LLA31+T?
For technical support, including MAX16040LLA31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16040LLA31+T requirements.
6.How does Aetrix verify that MAX16040LLA31+T is sourced from the original manufacturer or authorized distributors?
All MAX16040LLA31+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 MAX16040LLA31+T meets industry standards.
7.What is the process for return or replacement of MAX16040LLA31+T?
All MAX16040LLA31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16040LLA31+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 MAX16040LLA31+T part is unused and in its original packaging.
Return procedure for MAX16040LLA31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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