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Analog Devices Inc./Maxim Integrated MAX6337US16D2-T
- Part No.:
- MAX6337US16D2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6337US16D2-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,635
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Product details
Overview
MAX6337US16D2-T from Maxim Integrated is an ultra-low-voltage, open-drain microprocessor supervisory circuit designed to monitor 1.6V power supplies in space-constrained embedded systems. It asserts an active-low RESET signal when VCC falls below 1.60V or when the debounced manual-reset input (MR) is asserted, with a guaranteed minimum timeout of 20ms and valid operation down to VCC = 1.0V. Used in portable equipment and automotive controllers for reliable brownout detection.
For engineers reviewing the MAX6337US16D2-T datasheet, MAX6337US16D2-T pinout, MAX6337US16D2-T application, or MAX6337US16D2-T equivalent, key selection criteria include reset threshold accuracy (±1.8% at +25°C), open-drain output compatibility with bidirectional µP reset pins, low 3.3µA supply current at 1.8V, and SOT143 package suitability for high-density PCB layouts.
Technical Context
The MAX6337US16D2-T implements a factory-trimmed bandgap-based voltage comparator with hysteresis to reject fast VCC transients up to 24µs at 10V/ms slew rate. Its internal 20kΩ MR pull-up resistor enables direct connection of a momentary switch to GND without external components.
Reset assertion is synchronized to VCC recovery or MR deassertion, followed by a fixed 20ms timeout period (tRP = 20ms min) before RESET deassertion. The open-drain RESET output requires an external pull-up resistor and supports wired-OR configurations with other reset sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.60V ±1.8% (25°C), ±3% (-40°C to +125°C): ensures reliable detection of 1.6V supply brownout without false triggering |
| Reset Timeout Period | 20ms minimum: guarantees sufficient hold time for µP initialization after power recovery |
| Supply Voltage Range | 1.0V to 5.5V: supports operation during deep brownout while maintaining valid RESET state |
| Supply Current | 3.3µA typical at 1.8V: enables multi-year battery life in portable instrumentation |
| RESET Output Type | Open-drain active-low: allows direct interface to bidirectional µP reset pins (e.g., Motorola 68HC11) and wired-OR reset buses |
| MR Input Threshold | 0.42V typical: ensures robust low-level recognition even with noisy manual switch contacts |
| Operating Temperature | -40°C to +125°C: qualified for under-hood automotive and industrial control environments |
Pinout & Package
MAX6337US16D2-T is housed in a 4-pin SOT143 surface-mount package (3.0mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts in portable and automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: GND | Ground reference | Return path for all internal circuitry; must be connected to system ground plane for stable reset threshold accuracy |
| 2: RESET | Open-drain active-low reset output | Sinks current when asserted; requires external pull-up resistor to VCC or another logic rail for proper level translation |
| 3: MR | Debounced manual-reset input | Logic-low assertion triggers reset; internal 20kΩ pull-up allows NC configuration; immune to <30ns glitches |
| 4: VCC | Power supply input | Monitored supply rail; device operates correctly down to 1.0V, enabling early brownout detection before µP fails |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 1.60V with ±1.8% room-temperature tolerance eliminates need for external calibration components |
| Ultra-low operating voltage | Valid RESET assertion guaranteed down to VCC = 1.0V-critical for detecting pre-failure supply collapse |
| Integrated MR debounce | Eliminates external RC filter; supports direct pushbutton connection to GND with no additional parts |
| Transient immunity | Rejects VCC glitches ≤24µs at 10V/ms, preventing spurious resets during switching noise events |
| Lead-free and RoHS-compliant packaging | Tape-and-reel delivery with Pb-free SOT143 option (+T suffix) meets global environmental compliance requirements |
Applications
| Portable Medical Instrumentation | Automotive Body Control Module |
|---|---|
|
Use Scenario: Battery-powered handheld glucose meters requiring guaranteed reset during Li-ion discharge from 3.6V to 2.0V. IC Role / Device Role / Timing Role: Monitors main 1.6V LDO output feeding µP core; asserts RESET before supply drops below µP minimum operating voltage. Use Value: Prevents corrupted memory writes and firmware lockup during gradual battery depletion, extending usable device runtime. |
Use Scenario: Under-dash control unit exposed to wide temperature swings (-40°C to +125°C) and load-dump transients. IC Role / Device Role / Timing Role: Supervises 1.6V domain powering CAN controller; provides 20ms reset pulse to ensure clean CAN node reinitialization after ignition cycling. Use Value: Maintains deterministic reset behavior across full automotive temperature range without external hysteresis components. |
| Industrial PLC I/O Module | Smart Energy Meter |
|
Use Scenario: DIN-rail mounted I/O expander with isolated 1.6V logic rail powered from DC-DC converter. IC Role / Device Role / Timing Role: Detects converter output sag during high-current solenoid actuation; holds µP in reset until supply stabilizes. Use Value: Eliminates need for discrete comparator + RC timer, reducing BOM count and board area by >30%. |
Use Scenario: Revenue-grade meter with tamper-detection circuitry requiring fail-safe reset on AC mains dropout. IC Role / Device Role / Timing Role: Monitors backup supercapacitor voltage (1.6V threshold); initiates secure shutdown sequence via open-drain RESET tied to µP's bidirectional reset pin. Use Value: Enables single-wire reset arbitration between main µP and security co-processor using shared pull-up resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6336US16D2-T | Push/pull active-low RESET output; guaranteed valid down to VCC = 0.7V | Requires no external pull-up; suitable where µP reset pin is unidirectional and sinking-limited | Select when board layout prohibits external pull-up or when lowest possible VCC operating margin is required |
| MAX6314US16D2-T | Same SOT143 package and pinout; 1.6V threshold but only 1ms reset timeout | Lacks 20ms/100ms timeout options; not suitable for µPs requiring extended initialization windows | Choose only for cost-sensitive designs where 1ms reset hold time satisfies µP datasheet requirements |
Compared with MAX6337US16D2-T, the MAX6336US16D2-T offers stronger drive capability at lower VCC but forfeits wired-OR flexibility, while the MAX6314US16D2-T reduces timeout duration by 95%-making it unsuitable for most modern µPs requiring ≥10ms reset assertion.
Availability
MAX6337US16D2-T is available at Aetrix Electronics and suitable for portable medical instrumentation, automotive body control modules, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6337US16D2-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) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications.
The MAX6335/MAX6336/MAX6337 family delivers ultra-low-voltage supervisory circuits targeting space-constrained, battery-powered, and harsh-environment systems where precision reset timing and minimal external components are critical.
FAQ
What is the exact reset threshold voltage for MAX6337US16D2-T?
The MAX6337US16D2-T has a factory-trimmed reset threshold of 1.60V, with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C operating range. This value is confirmed in Table 1 of the official datasheet and applies specifically to the "US16" suffix variant. The threshold is set using laser trimming during production and does not require external adjustment.
Does MAX6337US16D2-T support operation below 1.6V supply voltage?
Yes, MAX6337US16D2-T is guaranteed to maintain correct RESET/RESET output states down to VCC = 1.0V, as explicitly stated in the General Description section. Below 1.0V, the device may not assert reset reliably, but its internal logic remains functional until VCC drops near 0.7V-though the open-drain output cannot sink sufficient current below 1.0V to guarantee logic-low levels.
What is the purpose of the "D2" in MAX6337US16D2-T?
The "D2" in MAX6337US16D2-T indicates a nominal reset timeout period of 20ms minimum, per Maxim's ordering nomenclature. "D1" = 1ms, "D2" = 20ms, "D3" = 100ms. This timeout begins after VCC rises above 1.60V or after MR is deasserted, and is fully specified across temperature. The value is factory-programmed and non-adjustable.
Can MAX6337US16D2-T replace MAX812R in existing designs?
MAX6337US16D2-T is pin-compatible with MAX812R per the datasheet's "Pin Compatible with MAX811/MAX812" statement, sharing identical SOT143 pinout and 1.6V threshold option. However, MAX6337US16D2-T offers 20ms timeout (vs. MAX812R's 140ms), lower 3.3µA supply current (vs. ~10µA), and guaranteed 1.0V operation (vs. 1.1V min for MAX812R), requiring validation of timeout adequacy in the target µP.
Is an external pull-up resistor required for MAX6337US16D2-T's RESET pin?
Yes, an external pull-up resistor is mandatory for MAX6337US16D2-T because its RESET output is open-drain. The datasheet recommends values between 10kΩ and 100kΩ depending on bus capacitance and rise-time requirements. Without this resistor, the RESET line floats and cannot drive a logic-high level, rendering the supervisory function inoperable in most µP interfaces.
MAX6337US16D2-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.6V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6337US16D2-T FAQ
1.How can I place an order for MAX6337US16D2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6337US16D2-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 MAX6337US16D2-T reliable?
The price and inventory of MAX6337US16D2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6337US16D2-T is usually 5 days.
3.What payment methods are accepted for MAX6337US16D2-T?
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4.How is shipping managed for MAX6337US16D2-T?
MAX6337US16D2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6337US16D2-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 MAX6337US16D2-T?
For technical support, including MAX6337US16D2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6337US16D2-T requirements.
6.How does Aetrix verify that MAX6337US16D2-T is sourced from the original manufacturer or authorized distributors?
All MAX6337US16D2-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 MAX6337US16D2-T meets industry standards.
7.What is the process for return or replacement of MAX6337US16D2-T?
All MAX6337US16D2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6337US16D2-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 MAX6337US16D2-T part is unused and in its original packaging.
Return procedure for MAX6337US16D2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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