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Analog Devices Inc./Maxim Integrated MAX16040LLA29+T
- Part No.:
- MAX16040LLA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16040LLA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,807
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Product details
Overview
The MAX16040LLA29+T from Maxim Integrated is an 8-pin μDFN battery-backup supervisory IC with auxiliary adjustable-reset input (RESETIN), active-low push-pull reset output, and integrated power-fail comparator. It features a factory-set 2.93V reset threshold, 140ms minimum reset timeout, and operates from 1.2V to 5.5V supply voltage. It delivers reliable μP reset, battery switchover, and power-fail warning in portable POS terminals and critical microcontroller systems.
For engineers reviewing the MAX16040LLA29+T datasheet, MAX16040LLA29+T pinout, MAX16040LLA29+T application, or MAX16040LLA29+T equivalent, this page provides verified functional specifications, validated pin roles, confirmed backup-mode behavior, and real-world selection guidance for industrial and battery-powered embedded designs.
Technical Context
The MAX16040LLA29+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 push-pull RESET for ≥140ms after VCC rises above 2.93V or after RESETIN recovers from below 1.235V.
It integrates a dedicated power-fail comparator (PFI/PFO) with 1.235V threshold and 1% hysteresis, independent of the main reset path. Battery switchover occurs automatically when VCC falls below both the 2.93V threshold and VBATT by >40mV, routing BATT to OUT with <2µA standby current at -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (factory-set, ±7mV tolerance over temperature); ensures deterministic μP reset at 3.0V nominal supply brownout. |
| Reset Timeout Period | 140ms minimum (guaranteed); holds μP in reset long enough for stable clock and supply recovery before code execution. |
| Supply Current | 13µA typical at 2.8V VCC; enables multi-year operation on coin-cell backup in always-on instrumentation. |
| Battery Backup Current | 2µA max at -40°C to +85°C (VBATT = 2.8V, VCC = 0V); preserves battery life during extended power loss. |
| RESET Output Type | Active-low push-pull; drives CMOS inputs directly without pull-up resistor, reducing BOM count and board space. |
| RESETIN Threshold | 1.235V ±50mV; supports accurate monitoring of secondary supplies (e.g., 2.5V, 3.3V rails) using standard resistor dividers. |
| Operating Temperature | -40°C to +85°C; fully specified for industrial and automotive-adjacent environments without derating. |
Pinout & Package
Package: 2mm × 2mm, 8-pin μDFN (pin pitch: 0.5mm), exposed pad, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Asserts low during VCC undervoltage, RESETIN low condition, or power failure; drives μP reset pin directly. |
| 2 - PFI | Power-fail input | Monitors external supply via resistor divider; triggers PFO low when voltage falls below 1.235V. |
| 3 - GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection to minimize noise coupling. |
| 4 - RESETIN | Auxiliary reset input | User-adjustable comparator input; asserts RESET when voltage drops below 1.235V (e.g., for secondary rail monitoring). |
| 5 - PFO | Active-low power-fail output | Push-pull output that goes low when PFI falls below threshold or VCC drops below reset voltage. |
| 6 - VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT until switchover to battery occurs. |
| 7 - OUT | System power output | Delivers regulated power to SRAM or real-time clock; switches seamlessly between VCC and BATT based on voltage comparison. |
| 8 - BATT | Backup battery input | Connects coin cell or supercap; supplies OUT only when VCC < VTH and VCC < VBATT – 40mV. |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESETIN comparator | 1.235V internal reference enables precise monitoring of secondary supplies (e.g., 2.5V, 3.3V) with <25nA input bias. |
| Low quiescent current | 13µA typical ICC at 2.8V ensures minimal drain on primary supply during normal operation. |
| Battery switchover hysteresis | 40mV built-in hysteresis prevents oscillation during slow VCC ramp-down or noisy battery transitions. |
| Power-fail comparator independence | Dedicated PFI/PFO path operates even when main reset is inactive, allowing early warning before brownout. |
| Reset assertion down to 1.2V VCC | Guarantees valid RESET signal generation even during deep undervoltage conditions common in Li-ion discharge profiles. |
Applications
| Portable POS Terminals | Critical μP Power Monitoring |
|---|---|
Use Scenario: Battery-backed transaction terminal operating on single-cell Li-ion with intermittent AC charging. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, RAM backup switchover, and power-fail interrupt before main supply collapse. Use Value: Prevents data corruption during sudden power loss; maintains RTC and SRAM state for >72 hours on CR2032. |
Use Scenario: Industrial PLC controller requiring guaranteed reset during 12V DC supply ripple or transient dropout. IC Role / Device Role / Timing Role: Primary reset generator with 140ms timeout and 2.93V threshold aligned to 3.0V system rail. Use Value: Eliminates need for external RC timing network; reduces layout sensitivity to EMI-induced false resets. |
| Real-Time Clock Backup | Intelligent Instrumentation |
Use Scenario: Medical data logger with nonvolatile memory and timestamping powered by 3.3V rail and backup supercap. IC Role / Device Role / Timing Role: Dual-role device: provides VCC-monitored reset and seamless BATT-to-OUT switchover for RTC power domain. Use Value: Enables sub-µA backup current draw; extends supercap lifetime to >5 years under typical usage. |
Use Scenario: Handheld test equipment with dual-supply architecture (5V analog, 3.3V digital) and isolated communication interfaces. IC Role / Device Role / Timing Role: RESETIN monitors 5V analog rail while main reset guards 3.3V digital domain; PFO signals upstream power supervisor. Use Value: Detects analog supply degradation before digital corruption occurs; supports fault-isolation diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16036LLA29+T | 10-pin μDFN; includes CEIN/CEOUT chip-enable gating not present in MAX16040LLA29+T. | Suitable where SRAM write-protection during brownout is required; adds PCB routing complexity. | Select MAX16036LLA29+T only if CE gating is needed; otherwise MAX16040LLA29+T saves board area and cost. |
| TPS3808G33DBVR | Fixed 3.08V reset threshold; no RESETIN input; 350ms reset timeout; SOT-23-6 package. | Lacks auxiliary reset input and battery switchover; limited to basic reset-only use cases. | Choose TPS3808G33DBVR for simple reset-only applications with no backup or secondary monitoring needs. |
Compared with MAX16036LLA29+T, the MAX16040LLA29+T removes CE gating to reduce footprint and cost while retaining full RESETIN functionality; compared with TPS3808G33DBVR, it adds battery switchover and user-adjustable reset input at the expense of slightly higher design complexity.
Availability
MAX16040LLA29+T is available at Aetrix Electronics and suitable for portable POS terminals, critical μP power monitoring, real-time clock backup, and intelligent instrumentation requiring stable component supply across industrial temperature ranges.
Supply support for MAX16040LLA29+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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, computing, and consumer markets.
The MAX16033–MAX16040 family targets compact, low-power supervisory functions in space-constrained battery-operated systems, emphasizing precision reset thresholds, ultra-low standby current, and integrated backup switchover.
FAQ
What is the exact reset threshold voltage of the MAX16040LLA29+T?
The MAX16040LLA29+T has a factory-trimmed reset threshold of 2.93V, with guaranteed tolerance of ±7mV over the full -40°C to +85°C temperature range. This value is fixed and cannot be adjusted; it is distinct from the 1.235V internal reference used for the RESETIN comparator. The 2.93V threshold aligns precisely with 3.0V nominal supply rails to ensure robust brownout detection before logic instability occurs.
Does the MAX16040LLA29+T support battery switchover, and what is its backup current consumption?
Yes, the MAX16040LLA29+T supports automatic battery switchover: when VCC falls below both the 2.93V reset threshold and VBATT by more than 40mV, it disconnects VCC from OUT and connects BATT instead. In full battery-backup mode (VCC = 0V, VBATT = 2.8V), the MAX16040LLA29+T draws ≤2µA over temperature, enabling multi-year operation on standard coin cells without compromising data retention.
Can the MAX16040LLA29+T monitor a secondary power supply, and how is it configured?
Yes, the MAX16040LLA29+T includes a dedicated RESETIN input with a precise 1.235V internal reference. To monitor a secondary supply (e.g., 2.5V or 3.3V), connect a resistor divider from that supply to RESETIN so that the divided voltage falls below 1.235V when the monitored rail fails. The MAX16040LLA29+T then asserts RESET, providing independent fault detection beyond the main VCC supervision.
What type of reset output does the MAX16040LLA29+T provide, and what are its drive capabilities?
The MAX16040LLA29+T provides an active-low push-pull RESET output, capable of sinking 20mA while maintaining VOL ≤ 0.3V at ISINK = 1.6mA and VCC ≥ 2.1V. Unlike open-drain variants, it requires no external pull-up resistor, simplifying layout and ensuring fast, deterministic reset signaling to microcontrollers and FPGAs without bus contention concerns.
How does the MAX16040LLA29+T handle power-fail detection, and what is the PFI threshold?
The MAX16040LLA29+T uses a dedicated power-fail comparator with a fixed 1.235V threshold on the PFI pin. When the voltage at PFI falls below this level-typically set by an external resistor divider across a monitored supply-the PFO output asserts low. PFO is also forced low when VCC drops below the 2.93V reset threshold, ensuring coordinated response to both primary and auxiliary supply failures.
MAX16040LLA29+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:
- 2.93V
- 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)
MAX16040LLA29+T FAQ
1.How can I place an order for MAX16040LLA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16040LLA29+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 MAX16040LLA29+T reliable?
The price and inventory of MAX16040LLA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16040LLA29+T is usually 5 days.
3.What payment methods are accepted for MAX16040LLA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16040LLA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16040LLA29+T?
MAX16040LLA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16040LLA29+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 MAX16040LLA29+T?
For technical support, including MAX16040LLA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16040LLA29+T requirements.
6.How does Aetrix verify that MAX16040LLA29+T is sourced from the original manufacturer or authorized distributors?
All MAX16040LLA29+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 MAX16040LLA29+T meets industry standards.
7.What is the process for return or replacement of MAX16040LLA29+T?
All MAX16040LLA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16040LLA29+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 MAX16040LLA29+T part is unused and in its original packaging.
Return procedure for MAX16040LLA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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