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Analog Devices Inc./Maxim Integrated MAX16040LLA46+T
- Part No.:
- MAX16040LLA46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16040LLA46+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,647
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Product details
Overview
The MAX16040LLA46+T from Maxim Integrated is an 8-pin μDFN low-power supervisory circuit for microprocessor systems, featuring auxiliary adjustable-reset input (RESETIN), active-low push-pull reset output, power-fail comparator, and battery switchover control. It operates from 1.2V to 5.5V, provides 4.63V factory-set reset threshold, 140ms minimum reset timeout, and draws only 13µA quiescent current - enabling reliable SRAM backup in portable POS terminals and industrial controllers.
For engineers reviewing the MAX16040LLA46+T datasheet, MAX16040LLA46+T pinout, MAX16040LLA46+T application, or MAX16040LLA46+T equivalent, key selection criteria include its RESETIN comparator threshold (1.235V), battery switchover hysteresis (40mV), push-pull reset drive capability (20mA sink), and operation across –40°C to +85°C with full specification.
Technical Context
The MAX16040LLA46+T implements a precision voltage-monitoring architecture centered on a 1.235V internal reference, used both for the RESETIN comparator and the PFI power-fail comparator. Its reset generator asserts active-low RESET for ≥140ms after VCC rises above 4.63V or after RESETIN recovers from below 1.235V.
It integrates a dedicated battery switchover MOSFET path from BATT to OUT with 40mV hysteresis, enabling seamless transition during brownout without external components. The device lacks manual reset (MR), watchdog (WDI), or chip-enable gating (CEIN/CEOUT) - distinguishing it from other members of the MAX16033–MAX16040 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.63V (factory-trimmed, ±0.12V tolerance) - ensures precise 5V supply monitoring with no external resistor network required. |
| RESET Output Type | Active-low push-pull - delivers 20mA sink capability without external pull-up, simplifying interface to µP reset inputs. |
| RESET Timeout Period | 140ms minimum - guarantees sufficient hold time for µP initialization and memory stabilization after power recovery. |
| Quiescent Supply Current | 13µA at VCC = 2.8V - enables multi-year battery backup operation in always-on embedded systems. |
| RESETIN Threshold | 1.235V (±50mV) - allows accurate monitoring of secondary supplies (e.g., 3.3V, 2.5V) via external resistor divider. |
| Battery Switchover Hysteresis | 40mV - prevents oscillation during slow VCC decay by requiring VCC to rise 40mV above VBATT before switching back from battery. |
| Operating Temperature Range | –40°C to +85°C - fully specified for industrial and commercial environments without derating. |
Pinout & Package
Package: 2mm × 2mm, 8-pin μDFN (pin pitch: 0.5mm), exposed pad for thermal performance. RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Asserts low when VCC < 4.63V or RESETIN < 1.235V; holds low ≥140ms after recovery; drives µP reset directly. |
| 2 - PFI | Power-fail input | Monitors external supply via resistor divider; trips PFO when voltage falls below 1.235V. |
| 3 - GND | Ground reference | Primary return path for all analog and digital functions; connects to exposed thermal pad. |
| 4 - RESETIN | Auxiliary reset input | Comparator input referenced to 1.235V; falling edge below threshold triggers RESET assertion. |
| 5 - PFO | Active-low power-fail output | Push-pull output asserting low on PFI under-voltage or VCC reset condition; usable as NMI or interrupt source. |
| 6 - VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation. |
| 7 - OUT | System power output | Switches between VCC and BATT based on voltage comparison; supplies up to 200mA to SRAM or real-time clock. |
| 8 - BATT | Backup battery input | Connects to coin cell or supercap; automatically engages when VCC drops below reset threshold and VBATT > VCC + 40mV. |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESETIN comparator | 1.235V internal reference enables precise monitoring of secondary rails (e.g., 3.3V, 2.5V) with <25nA input bias - supports high-impedance divider networks. |
| Low-quiescent-current battery backup | 1µA typical battery standby current at +25°C - extends coin-cell life beyond 10 years in infrequently powered systems. |
| Integrated battery switchover MOSFET | On-resistance ≤4.6Ω at VCC = 2.5V / IOUT = 25mA - minimizes voltage drop and power loss during backup mode. |
| Power-fail warning with hysteresis | 1.235V PFI threshold with 1% hysteresis - rejects noise while providing early warning of supply collapse before reset triggers. |
| Reset valid down to 1.2V supply | RESET remains functional and asserted even as VCC decays to 1.2V - ensures deterministic behavior during deep brownout. |
Applications
| POS Terminal Power Management | Industrial PLC Real-Time Clock Backup |
|---|---|
|
Use Scenario: Maintaining SRAM and RTC state during AC mains interruption or battery swap in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Supervisory controller managing VCC-to-BATT switchover, generating reset pulse on brownout, and signaling power-fail via PFO. Use Value: Prevents transaction data loss and clock drift using 4.63V reset threshold aligned with 5V system rail and 140ms guaranteed reset hold time. |
Use Scenario: Preserving configuration memory and timekeeping in programmable logic controllers during extended power outages. IC Role / Device Role / Timing Role: Dual-rail monitor: RESETIN tracks 3.3V I/O rail while main VCC monitors 24V DC-DC output; PFO alerts CPU before shutdown. Use Value: Enables fail-safe logging via 1.235V RESETIN comparator and eliminates need for discrete comparators or external timing capacitors. |
| Set-Top Box Nonvolatile Memory Retention | Medical Infusion Pump Battery Switchover |
|
Use Scenario: Securing EEP-ROM and calibration data during brief line sags in consumer set-top boxes with dual-supply architectures. IC Role / Device Role / Timing Role: System-level supervisor coordinating reset assertion, power-fail interrupt generation, and automatic battery engagement to OUT rail. Use Value: Achieves <1µA battery leakage in backup mode and 40mV switchover hysteresis - prevents false toggling during marginal VCC conditions. |
Use Scenario: Ensuring continuous operation of safety-critical timing and motor control logic during primary power failure in Class II medical devices. IC Role / Device Role / Timing Role: Fault-tolerant power manager delivering regulated backup to microcontroller and real-time clock via low-RON BATT-to-OUT path. Use Value: Guarantees 1.2V minimum operating voltage and 140ms reset timeout - meets IEC 60601-1 requirements for uninterrupted therapy delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16036LLA46+T | 10-pin μDFN; includes CEIN/CEOUT chip-enable gating; same RESETIN, reset threshold, and package temperature range. | Required where µP CE signal must be gated during reset to prevent RAM corruption - not needed if only RESET and PFO are used. | Select MAX16036LLA46+T only if chip-enable control is required; otherwise MAX16040LLA46+T offers smaller footprint and lower cost. |
| TPS3808G33DBVR | Single-channel supervisor; 3.3V fixed reset threshold; no RESETIN input; open-drain RESET; 1.8V–6.5V supply range. | Lacks auxiliary reset monitoring and battery switchover - suitable only for basic reset generation, not SRAM backup systems. | Choose TPS3808G33DBVR for simple 3.3V reset-only applications; MAX16040LLA46+T is mandatory when RESETIN monitoring or BATT switchover is required. |
Compared with MAX16036LLA46+T, the MAX16040LLA46+T saves board space and cost by omitting unused CEIN/CEOUT pins, while retaining identical reset accuracy, battery control, and temperature performance. Versus TPS3808G33DBVR, it adds critical functionality - RESETIN monitoring and integrated battery switchover - essential for data-retentive systems.
Availability
MAX16040LLA46+T is available at Aetrix Electronics and suitable for portable POS terminals, industrial PLCs, set-top boxes, and medical infusion pumps requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX16040LLA46+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 in industrial, automotive, and computing markets.
The MAX16033–MAX16040 product line was engineered specifically for low-power, space-constrained microprocessor supervisory tasks - emphasizing ultra-low quiescent current, accurate voltage thresholds, and integrated battery switchover in sub-4mm² packages.
FAQ
What is the factory-set reset threshold voltage for the MAX16040LLA46+T?
The MAX16040LLA46+T has a factory-trimmed reset threshold of 4.63V (typical), with guaranteed range of 4.50V to 4.75V over –40°C to +85°C. This value is laser-trimmed during production and does not require external resistors - making it ideal for 5V system monitoring where precision and stability are critical. The '46' suffix in MAX16040LLA46+T explicitly denotes this 4.63V threshold.
Does the MAX16040LLA46+T support battery switchover, and what is the switchover hysteresis?
Yes, the MAX16040LLA46+T supports automatic battery switchover from VCC to BATT when VCC falls below the reset threshold and VBATT exceeds VCC by at least 40mV. This 40mV hysteresis prevents chattering during slow VCC decay. The device uses an internal MOSFET with ≤4.6Ω on-resistance at 2.5V to minimize voltage drop in backup mode - ensuring stable OUT voltage for SRAM or RTC circuits.
What is the function of the RESETIN pin on the MAX16040LLA46+T, and what voltage threshold does it use?
The RESETIN pin on the MAX16040LLA46+T is an auxiliary reset input comparator referenced to a precision 1.235V internal bandgap. When the voltage at RESETIN falls below 1.235V (±50mV), the device asserts RESET. This enables monitoring of secondary supplies - for example, using a resistor divider to detect failure of a 3.3V rail. Input bias current is ≤25nA, allowing high-value dividers without accuracy loss.
What type of RESET output does the MAX16040LLA46+T provide, and what is its drive strength?
The MAX16040LLA46+T provides an active-low push-pull RESET output, capable of sinking 20mA at VOL ≤ 0.3V (ISINK = 1.6mA, VCC ≥ 2.1V). Unlike open-drain variants, it requires no external pull-up resistor - simplifying PCB layout and reducing BOM count. The output remains valid down to VCC = 1.2V, ensuring robust reset assertion even during deep brownout conditions.
Is the MAX16040LLA46+T compatible with supercapacitor-based backup solutions?
Yes, the MAX16040LLA46+T is fully compatible with supercapacitor backup. Its BATT input accepts voltages up to 5.5V, and the 40mV switchover hysteresis prevents oscillation during gradual discharge. When paired with a 0.47F supercap charged to 5V via a series diode, the device sustains SRAM retention for minutes - far exceeding coin-cell duration. No additional circuitry is needed beyond the capacitor and diode.
MAX16040LLA46+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:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µDFN (2x2)
MAX16040LLA46+T FAQ
1.How can I place an order for MAX16040LLA46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16040LLA46+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 MAX16040LLA46+T reliable?
The price and inventory of MAX16040LLA46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16040LLA46+T is usually 5 days.
3.What payment methods are accepted for MAX16040LLA46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16040LLA46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16040LLA46+T?
MAX16040LLA46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16040LLA46+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 MAX16040LLA46+T?
For technical support, including MAX16040LLA46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16040LLA46+T requirements.
6.How does Aetrix verify that MAX16040LLA46+T is sourced from the original manufacturer or authorized distributors?
All MAX16040LLA46+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 MAX16040LLA46+T meets industry standards.
7.What is the process for return or replacement of MAX16040LLA46+T?
All MAX16040LLA46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16040LLA46+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 MAX16040LLA46+T part is unused and in its original packaging.
Return procedure for MAX16040LLA46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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