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Analog Devices Inc./Maxim Integrated MAX16040PLA23+
- Part No.:
- MAX16040PLA23+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16040PLA23+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,161
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Product details
Overview
MAX16040PLA23+ from Maxim Integrated is an 8-pin μDFN supervisory IC for microprocessor power monitoring and battery switchover, featuring a factory-set 2.32V reset threshold, active-low push-pull RESET output, auxiliary adjustable RESETIN input (1.235V threshold), and power-fail comparator with PFI/PFO. It operates from 1.2V to 5.5V supply, draws only 13µA quiescent current, and supports battery-backup mode for SRAM retention in portable POS terminals and industrial controllers.
For engineers reviewing the MAX16040PLA23+ datasheet, MAX16040PLA23+ pinout, MAX16040PLA23+ application, or MAX16040PLA23+ equivalent, key selection criteria include its 2.32V factory-trimmed reset threshold, 140ms minimum reset timeout, 1.235V RESETIN comparator for secondary supply monitoring, and 8-pin 2mm × 2mm μDFN package with guaranteed operation from –40°C to +85°C.
Technical Context
The MAX16040PLA23+ implements a precision voltage-monitoring architecture with independent comparators for VCC (2.32V threshold), RESETIN (1.235V reference), and PFI (1.235V reference). Its internal MOSFET-based battery switchover circuit connects BATT to OUT when VCC falls below VTH and VBATT exceeds VCC by ≥40mV, enabling seamless SRAM backup without external components.
It integrates a dedicated RESETIN comparator path with 1.5µs propagation delay (VTH ±100mV), supports chip-enable gating only in 10-pin variants (excluded here), and provides push-pull RESET and PFO outputs-confirmed by the "L" suffix in the part number (MAX16040PLA23+ = "P" = open-drain PFO, "L" = push-pull RESET).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.32V (factory-trimmed, min 2.25V, max 2.38V) - ensures reliable reset assertion during 2.5V system brownout |
| RESET Output Type | Active-low push-pull - drives low without external pull-up, supports direct connection to µP reset pin |
| RESET Timeout Period | 140ms minimum - guarantees sufficient hold time for µP initialization after power recovery |
| Quiescent Supply Current | 13µA at VCC = 2.8V - enables multi-year battery life in always-on backup applications |
| RESETIN Threshold | 1.235V (±50mV) - allows precise monitoring of secondary supplies via external resistor divider |
| Operating Temperature Range | –40°C to +85°C - fully specified for industrial and embedded controller environments |
| Package | 8-pin µDFN (2mm × 2mm) - ultra-compact footprint for space-constrained portable equipment |
Pinout & Package
MAX16040PLA23+ uses an 8-pin µDFN package (2mm × 2mm, 0.5mm pitch) with wettable flanks, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low when VCC < 2.32V, RESETIN < 1.235V, or during power-fail event |
| 2 | PFI | Power-fail input; referenced to 1.235V internal comparator; triggers PFO when voltage falls below threshold |
| 3 | GND | Analog/digital ground reference for all internal comparators and output drivers |
| 4 | MR | Manual-reset input; internally pulled up to VCC; logic-low assertion forces RESET for ≥140ms after release |
| 5 | PFO | Active-low open-drain power-fail output; sinks current when PFI falls below 1.235V or VCC drops below reset threshold |
| 6 | VCC | Main supply input (1.2V–5.5V); powers internal circuitry and sources OUT during normal operation |
| 7 | OUT | Output rail; sourced from VCC when VCC > VTH, or from BATT when VCC < VTH and VBATT > VCC + 40mV |
| 8 | BATT | Backup battery input; connected to OUT during brownout; supports 2.1V–5.5V battery sources |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESETIN comparator | 1.235V precision reference enables monitoring of secondary supplies (e.g., 3.3V, 5V rails) with external resistor divider |
| Low 13µA quiescent current | Minimizes battery drain in backup mode - sustains >10-year shelf life on typical coin-cell batteries |
| 140ms minimum reset timeout | Guarantees µP reset hold time meets JEDEC JESD76 requirements for reliable boot sequence recovery |
| 2.32V factory-trimmed reset threshold | Optimized for 2.5V systems; eliminates need for external resistor network or trimming during production |
| Seamless battery switchover | 40mV hysteresis prevents oscillation during slow VCC fall; BATT-to-OUT on-resistance ≤4.6Ω at 2.5V/25mA |
Applications
| Portable POS Terminals | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-backed SRAM retains transaction logs and configuration data during AC power loss or battery swap in handheld payment terminals. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, automatic BATT switchover, and RESET assertion to halt µP execution during brownout. Use Value: Prevents data corruption by ensuring SRAM remains powered and µP held in reset until stable VCC returns - enabled by 13µA backup current and 2.32V threshold aligned with 2.5V logic rails. |
Use Scenario: Maintaining real-time clock and I/O state during brief mains interruptions in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 3.3V supply via VCC pin and secondary 5V field bus supply via RESETIN pin. Use Value: Independent 1.235V RESETIN comparator allows simultaneous validation of two critical rails - eliminating need for second supervisor IC and reducing BOM count. |
| Set-Top Box Memory Backup | Intelligent Instrumentation |
Use Scenario: Preserving channel lineup, parental controls, and firmware state in consumer set-top boxes during power cycling or grid fluctuations. IC Role / Device Role / Timing Role: Power supervisor managing switchover between 3.3V main supply and 3V lithium backup cell, with PFO signaling early power-fail warning to MCU. Use Value: Open-drain PFO output interfaces directly with µP NMI pin for immediate interrupt-driven save-and-shutdown - supported by 4µs PFI-to-PFO delay and 1.235V trip point. |
Use Scenario: Securing calibration data and sensor offset values in portable multimeters and handheld analyzers during battery replacement. IC Role / Device Role / Timing Role: Low-power supervisor asserting RESET and enabling BATT-to-OUT path while isolating MR and RESETIN inputs during backup mode. Use Value: Input isolation in battery-backup mode (per Table 1) prevents noise coupling from external switches or sensors - critical for measurement integrity in ESD-prone field environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16039PLA31+ | Same 8-pin µDFN package; 3.08V reset threshold (vs. 2.32V); includes BATTON output (absent in MAX16040) | Targeted at 3.3V systems requiring battery-status indication; not suitable where 2.5V brownout detection is mandatory | Select MAX16039PLA31+ only if higher reset threshold and BATTON indicator are required; MAX16040PLA23+ is optimal for 2.5V/2.3V rail supervision. |
| TPS3808G33DBVR | 3.3V fixed reset threshold; SOT-23-6 package; no RESETIN or PFI inputs; 350ms reset timeout | Lacks auxiliary monitoring capability; suited for single-rail reset-only applications without battery switchover | Choose TPS3808G33DBVR only for cost-sensitive, single-supply designs without backup or dual-rail monitoring needs. |
Compared with MAX16039PLA31+, MAX16040PLA23+ offers tighter 2.32V threshold for robust 2.5V system supervision and omits BATTON to reduce pin count; versus TPS3808G33DBVR, it delivers full battery switchover, dual-input monitoring (RESETIN + PFI), and ultra-low 13µA quiescent current - making it uniquely suited for compact, multi-rail, battery-critical applications.
Availability
MAX16040PLA23+ is available at Aetrix Electronics and suitable for portable POS terminals, industrial PLC controllers, set-top box memory backup, and intelligent instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX16040PLA23+ 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 high-performance analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, computing, and communications markets.
The MAX16033–MAX16040 family was engineered specifically for low-power, space-constrained microprocessor supervisory functions - integrating reset generation, battery switchover, power-fail warning, and auxiliary voltage monitoring in sub-2mm² packages.
FAQ
What is the factory-set reset threshold voltage for MAX16040PLA23+?
The MAX16040PLA23+ has a factory-set reset threshold voltage of 2.32V, with guaranteed minimum and maximum values of 2.25V and 2.38V respectively over the full –40°C to +85°C operating range. This threshold is laser-trimmed during production and does not require external resistors or calibration. The "23" in the part number explicitly denotes the 2.32V option per Maxim's selector guide.
Does MAX16040PLA23+ support battery switchover, and what is the switchover condition?
Yes, MAX16040PLA23+ supports automatic battery switchover. Switchover occurs when both conditions are met: (1) VCC falls below the 2.32V reset threshold, and (2) VBATT exceeds VCC by at least 40mV. During switchover, OUT is disconnected from VCC and connected to BATT, maintaining power to attached SRAM. The 40mV hysteresis prevents oscillation during slow VCC decay.
What is the function of the RESETIN pin on MAX16040PLA23+?
The RESETIN pin on MAX16040PLA23+ is an auxiliary reset input referenced to an internal 1.235V comparator. When the voltage at RESETIN falls below 1.235V, the device asserts RESET. This allows monitoring of a secondary power rail (e.g., 3.3V or 5V) using an external resistor divider. The RESETIN-to-RESET propagation delay is 1.5µs (for VTH ±100mV transitions), and input bias current is ≤25nA.
Is MAX16040PLA23+ compatible with 1.2V logic systems?
Yes, MAX16040PLA23+ supports operation down to 1.2V supply voltage and maintains valid RESET assertion even when VCC drops to 1.2V. Its active-low push-pull RESET output remains functional at low VCC, and the reset timeout period (≥140ms) is guaranteed across the full 1.2V–5.5V operating range. This makes it suitable for ultra-low-voltage microcontroller applications where supply rails scale below 1.8V.
What package type and dimensions does MAX16040PLA23+ use?
MAX16040PLA23+ uses an 8-pin µDFN package measuring 2.0mm × 2.0mm with 0.5mm pin pitch and wettable flanks. It is RoHS-compliant and lead-free ("+" suffix). This compact footprint is optimized for portable and space-constrained designs, and the package is fully specified for operation from –40°C to +85°C with thermal performance validated up to 380.6mW dissipation at +70°C ambient.
MAX16040PLA23+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- 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)
MAX16040PLA23+ FAQ
1.How can I place an order for MAX16040PLA23+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16040PLA23+ 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 MAX16040PLA23+ reliable?
The price and inventory of MAX16040PLA23+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16040PLA23+ is usually 5 days.
3.What payment methods are accepted for MAX16040PLA23+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16040PLA23+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16040PLA23+?
MAX16040PLA23+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16040PLA23+ 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 MAX16040PLA23+?
For technical support, including MAX16040PLA23+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16040PLA23+ requirements.
6.How does Aetrix verify that MAX16040PLA23+ is sourced from the original manufacturer or authorized distributors?
All MAX16040PLA23+ 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 MAX16040PLA23+ meets industry standards.
7.What is the process for return or replacement of MAX16040PLA23+?
All MAX16040PLA23+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16040PLA23+, 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 MAX16040PLA23+ part is unused and in its original packaging.
Return procedure for MAX16040PLA23+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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