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Analog Devices Inc./Maxim Integrated MAX16036LLB31+T
- Part No.:
- MAX16036LLB31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN
- Datasheet:
-
MAX16036LLB31+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,887
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Product details
Overview
The MAX16036LLB31+T from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary adjustable-reset input (RESETIN), power-fail comparator, active-low push-pull reset output, and chip-enable gating. It operates from 1.2V to 5.5V, features a factory-set 3.08V reset threshold (L31 variant), 140ms minimum reset timeout, and 13µA quiescent supply current. It is used in battery-backed SRAM systems for brownout protection and secondary supply monitoring.
For engineers reviewing the MAX16036LLB31+T datasheet, MAX16036LLB31+T pinout, MAX16036LLB31+T application, or MAX16036LLB31+T equivalent, key selection criteria include its 3.08V reset threshold accuracy, RESETIN comparator with 1.235V reference, push-pull reset structure, -40°C to +85°C operation, and 10-pin µDFN package compatibility with space-constrained portable and industrial μP systems.
Technical Context
The MAX16036LLB31+T implements a precision voltage-monitoring architecture centered on dual comparators: one for VCC against a factory-trimmed bandgap reference (3.00–3.15V range for L31), and another for the user-adjustable RESETIN input referenced to a stable 1.235V internal reference. Its chip-enable gating path connects CEIN to CEOUT only when RESET is deasserted, with <7ns propagation delay at 5V and 50pF load.
It integrates a dedicated power-fail comparator (PFI/PFO) independent of the main reset generator, enabling early warning of supply collapse before VCC drops below the reset threshold. The device enters battery-backup mode when VCC falls below both the reset threshold and VBATT, switching OUT to BATT with <4.6Ω typical BATT-to-OUT on-resistance at 25°C and 5mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (factory-trimmed, ±0.07V over -40°C to +85°C); ensures reliable μP reset during 3.3V rail brownout. |
| RESET Output Type | Active-low push-pull; drives low without external pull-up, supports direct interface to μP reset pin. |
| RESET Timeout Period | 140ms minimum; guarantees sufficient hold time for full μP initialization after power recovery. |
| Quiescent Supply Current | 13µA at 2.8V; enables multi-year battery backup in always-on monitoring applications. |
| RESETIN Threshold | 1.235V ±0.05V; allows precise monitoring of secondary supplies via external resistor divider. |
| Operating Temperature | -40°C to +85°C; qualified for industrial and extended commercial environments. |
| Package | 10-pin µDFN (2mm × 2mm, 0.5mm pitch); supports high-density PCB layouts in portable equipment. |
Pinout & Package
MAX16036LLB31+T is housed in a 10-pin, 2mm × 2mm, 0.5mm-pitch µDFN package with exposed pad (EP). Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise convention starting from top-left corner when marking is oriented upright.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Asserts low during VCC undervoltage, RESETIN low, or power-fail; holds for ≥140ms after recovery. |
| 2 - CEIN | Chip-enable input | Controls CEOUT pass-through; disabled during reset to prevent erroneous RAM writes. |
| 3 - PFI | Power-fail input | Monitors external supply via resistor divider; trips PFO when voltage falls below 1.235V. |
| 4 - GND | Ground reference | Primary return path for all analog and digital functions; must be low-impedance connection. |
| 5 - MR | Manual-reset input | Debounced logic input; low assertion forces RESET for ≥140ms after release (not used in MAX16036). |
| 6 - PFO | Active-low power-fail output | Push-pull output asserted when PFI < 1.235V or VCC < reset threshold. |
| 7 - VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation. |
| 8 - OUT | Regulated output | Sources from VCC normally; switches to BATT during backup mode with <4.6Ω on-resistance. |
| 9 - BATT | Battery backup input | Accepts 2.1V–5.5V; activates switchover when VCC < VTH and VCC < VBATT – 40mV. |
| 10 - CEOUT | Chip-enable output | Passes CEIN signal only when RESET is deasserted; pulled up to OUT when disconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESETIN comparator | 1.235V internal reference enables accurate monitoring of secondary supplies (e.g., 2.5V, 1.8V rails) with external resistive divider. |
| Chip-enable gating | CEIN-to-CEOUT transmission gate disables during reset, preventing spurious writes to CMOS RAM during brownout. |
| Power-fail warning | Dedicated PFI/PFO path provides early interrupt before VCC crosses reset threshold, allowing graceful shutdown. |
| Battery switchover control | Automatic BATT-to-OUT switching with 40mV hysteresis prevents oscillation during slow VCC decay. |
| Low-voltage operation | Functions down to 1.2V VCC; maintains reset validity and backup mode functionality even under deep brownout. |
Applications
| Portable Data Loggers | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Long-term environmental sensor data collection powered by coin-cell battery with periodic wake-up and transmission. IC Role / Device Role / Timing Role: Supervisory controller ensuring μP reset integrity during battery voltage sag and enabling SRAM retention via BATT switchover. Use Value: 13µA quiescent current extends battery life beyond 5 years; 3.08V reset threshold matches 3.3V LDO dropout behavior. | Use Scenario: Modular I/O expansion unit requiring fault-tolerant memory retention during AC line interruption or field wiring transients. IC Role / Device Role / Timing Role: Dual-supply monitor: primary VCC supervision + RESETIN-based monitoring of isolated 24V DC field bus supply. Use Value: Independent 1.235V RESETIN reference allows precise 24V rail monitoring (via 19.4:1 divider); CE gating prevents corrupted register writes during brownout. |
| Medical Point-of-Care Devices | Set-Top Box Conditional Access Modules |
Use Scenario: Battery-backed secure boot module storing cryptographic keys and calibration data across power cycles. IC Role / Device Role / Timing Role: SRAM supervisor with tamper-aware reset generation and battery switchover to preserve volatile security context. Use Value: Push-pull RESET eliminates need for external pull-up, reducing BOM count; 140ms timeout exceeds μP boot ROM requirements. | Use Scenario: Compact conditional access card requiring persistent session state during brief mains dips or cable disconnects. IC Role / Device Role / Timing Role: Power fail detector and backup switcher for embedded secure element SRAM and real-time clock domain. Use Value: PFI input monitors unregulated 12V supply pre-regulator, triggering PFO interrupt 100ms before VCC collapse; enables firmware save-to-flash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16036PLB31+T | Same functionality and pinout, but open-drain RESET and PFO outputs instead of push-pull. | Requires external pull-up resistors; better suited for wired-OR reset buses or level translation. | Select when system requires shared reset bus or interfacing with mixed-voltage logic families. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no RESETIN input, no CE gating, 3-pin SOT-23 package. | Lacks auxiliary monitoring and memory protection features; intended for basic reset-only use cases. | Choose only if design requires minimal footprint and does not need secondary supply monitoring or SRAM write protection. |
Compared with MAX16036PLB31+T, the MAX16036LLB31+T eliminates external pull-ups and simplifies layout; compared with TPS3808G33DBVR, it adds critical RESETIN monitoring and CE gating for robust memory subsystems-making it superior for battery-backed SRAM applications demanding reliability beyond basic reset.
Availability
MAX16036LLB31+T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, set-top box security modules, and battery-powered data loggers requiring stable component supply across long production lifecycles.
Supply support for MAX16036LLB31+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, sensing, and connectivity in industrial, automotive, and computing applications.
The MAX16033–MAX16040 family delivers integrated battery-backup supervision with configurable monitoring, targeting space-constrained μP systems needing reliable SRAM retention and multi-rail fault detection.
FAQ
What is the exact reset threshold voltage of the MAX16036LLB31+T?
The MAX16036LLB31+T has a factory-trimmed reset threshold of 3.08V, with guaranteed limits of 3.00V (min) and 3.15V (max) over the full -40°C to +85°C temperature range. This value is fixed for the L31 suffix and applies to the primary VCC monitoring function-not the auxiliary RESETIN input, which uses a separate 1.235V reference. The MAX16036LLB31+T datasheet specifies this in the Electrical Characteristics table under "Reset Threshold" for MAX160__L_31 variants.
Does the MAX16036LLB31+T support battery backup for SRAM, and how does switchover work?
Yes, the MAX16036LLB31+T supports automatic battery backup for SRAM via its OUT pin. When VCC falls below both the reset threshold (3.08V) and VBATT minus 40mV hysteresis, the internal MOSFET switches OUT from VCC to BATT. The BATT-to-OUT on-resistance is ≤4.6Ω at 25°C and 5mA load, ensuring low dropout during backup. The MAX16036LLB31+T remains fully functional in this mode, maintaining RESET assertion and PFO status while drawing only 1–2µA from the battery (excluding load current).
What is the purpose of the RESETIN pin on the MAX16036LLB31+T, and how is it configured?
The RESETIN pin on the MAX16036LLB31+T is a user-adjustable reset input referenced to an internal 1.235V precision bandgap. It allows monitoring of a secondary supply (e.g., 2.5V, 1.8V) using an external resistor divider. When the voltage at RESETIN falls below 1.235V, the device asserts RESET independently of VCC. The MAX16036LLB31+T datasheet provides design equations: R1 = R2 × ((VRTH / 1.235) – 1), where VRTH is the desired trip point. Input bias current is ≤25nA, enabling high-impedance dividers.
Can the MAX16036LLB31+T be used without a backup battery?
Yes, the MAX16036LLB31+T operates correctly without a backup battery. In such configurations, connect the BATT pin to GND and tie OUT directly to VCC. The device continues to provide VCC supervision, RESET generation, PFI/PFO monitoring, and CEIN/CEOUT gating. All core supervisory functions-including reset timeout, power-fail warning, and RESETIN monitoring-remain fully active. The MAX16036LLB31+T does not require BATT to power up or function; it only engages battery switchover when both VCC < VTH and VCC < VBATT – 40mV.
What are the key differences between the MAX16036LLB31+T and MAX16036PLB31+T?
The MAX16036LLB31+T and MAX16036PLB31+T share identical functionality, pinout, and electrical specifications except for output structure: the 'L' suffix denotes active-low push-pull RESET and PFO, while the 'P' suffix indicates active-low open-drain outputs. The MAX16036LLB31+T drives RESET low actively and releases high, eliminating external pull-up resistors. The MAX16036PLB31+T requires external pull-ups and supports wired-OR reset busing. Both use the same 10-pin µDFN package and operate identically in all other respects.
MAX16036LLB31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-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:
- 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:
- 10-µDFN (2x2)
MAX16036LLB31+T FAQ
1.How can I place an order for MAX16036LLB31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16036LLB31+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 MAX16036LLB31+T reliable?
The price and inventory of MAX16036LLB31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16036LLB31+T is usually 5 days.
3.What payment methods are accepted for MAX16036LLB31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16036LLB31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16036LLB31+T?
MAX16036LLB31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16036LLB31+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 MAX16036LLB31+T?
For technical support, including MAX16036LLB31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16036LLB31+T requirements.
6.How does Aetrix verify that MAX16036LLB31+T is sourced from the original manufacturer or authorized distributors?
All MAX16036LLB31+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 MAX16036LLB31+T meets industry standards.
7.What is the process for return or replacement of MAX16036LLB31+T?
All MAX16036LLB31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16036LLB31+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 MAX16036LLB31+T part is unused and in its original packaging.
Return procedure for MAX16036LLB31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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