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Analog Devices Inc./Maxim Integrated MAX6801UR44D2+T
- Part No.:
- MAX6801UR44D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6801UR44D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,517
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Product details
Overview
MAX6801UR44D2+T from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with push/pull active-low RESET output, factory-trimmed 4.38V reset threshold (±3% over temperature), 20ms minimum reset timeout, and guaranteed operation down to VCC = 0.7V. It monitors 2.85V–5.0V power supplies in embedded controllers and portable systems, eliminating external components while ensuring reliable power-on/brownout reset assertion.
For engineers reviewing the MAX6801UR44D2+T datasheet, MAX6801UR44D2+T pinout, MAX6801UR44D2+T application, or MAX6801UR44D2+T equivalent, key selection criteria include its 4.38V threshold tolerance, 20ms timeout stability across –40°C to +125°C, ultra-low 4µA supply current at 3V, and SOT23-3 compatibility with legacy MAX809/MAX6326 families.
Technical Context
The MAX6801UR44D2+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below 4.38V, asserting RESET low until VCC rises above threshold and remains stable for ≥20ms. Its BiCMOS process ensures propagation delay <30µs during fast VCC transients (10V/ms) and immunity to sub-100ns glitches.
Reset assertion is maintained down to VCC = 0.7V, with VOL ≤0.4V at ISINK = 50µA and VOH ≥0.8×VCC at ISOURCE = 500µA - enabling direct interfacing with CMOS inputs without pull-up resistors. The device requires no external timing or bias components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±3% over –40°C to +125°C - ensures accurate brownout detection for 4.5V nominal rails |
| Reset Timeout Period | 20ms minimum - meets JEDEC JESD78 requirement for processor initialization hold time |
| Supply Current | 4µA typical at VCC = 3.0V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | 0.7V to 5.5V - guarantees valid RESET state during deep brownout and full rail operation |
| Output Type | Push/pull active-low RESET - drives CMOS/TTL loads directly without external pull-up |
| Propagation Delay | 30µs max at 10V/ms VCC fall rate - rejects fast supply noise without false resets |
| Temperature Range | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6801UR44D2+T is housed in a RoHS-compliant 3-pin SOT23 package (outline 21-0051), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage - must connect to system ground plane |
| 2 | RESET | Active-low push/pull output - sinks current when asserted (VOL ≤0.4V), high-impedance when deasserted |
| 3 | VCC | Power supply input - powers internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-trimmed threshold | 4.38V set at wafer level with ±1.8% tolerance at +25°C and ±3% over full temperature range |
| Ultra-low quiescent current | 4µA at 3V enables integration into always-on monitoring circuits without battery drain penalty |
| Brownout transient immunity | Rejects VCC glitches <100ns wide at 100mV overdrive - prevents spurious resets in noisy power domains |
| Valid reset down to 0.7V | Guaranteed RESET assertion integrity even as VCC collapses - critical for fail-safe shutdown sequencing |
| No external components required | Integrated timing capacitor and comparator eliminate BOM cost and layout area vs discrete solutions |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Power monitoring during firmware updates and sensor calibration sequences in programmable logic controllers. IC Role / Device Role / Timing Role: Supervisory circuit asserting hardware reset to prevent corrupted register writes during undervoltage events. Use Value: 20ms timeout ensures CPU completes boot ROM checksum before releasing reset, while 4.38V threshold matches 4.5V LDO output tolerance. |
Use Scenario: Battery-backed operation of portable ultrasound and ECG analyzers with intermittent charging cycles. IC Role / Device Role / Timing Role: Brownout detector maintaining system reset until Li-ion cell voltage recovers above safe operating level. Use Value: 4µA supply current extends standby time between charges; 0.7V operation allows reset assertion even during deep discharge recovery. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Cold-cranking scenarios where 12V battery sags below 6V, causing 5V rail collapse in BCM microcontrollers. IC Role / Device Role / Timing Role: Primary reset supervisor ensuring MCU remains held in reset until stabilized 5V supply is restored. Use Value: –40°C to +125°C rating supports engine bay placement; 4.38V threshold avoids nuisance resets during 4.7V nominal rail ripple. |
Use Scenario: Tamper-resistant metering ICs requiring deterministic reset behavior during AC line dropout or surge events. IC Role / Device Role / Timing Role: Fail-safe reset generator that asserts on both power-up and brownout, with immunity to 100ns transients. Use Value: Push/pull output drives meter SoC reset pin directly; 20ms timeout satisfies IEC 62056-21 power-fail hold requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | 4.63V reset threshold, 20ms timeout, same SOT23-3 package and push/pull output | Higher threshold better suited for 5V systems with tighter regulation; less margin for 4.5V rails | Select when system VCC nominal is ≥4.75V and brownout margin must exceed 120mV |
| MAX6326UT44D2+T | 4.38V threshold, 20ms timeout, but open-drain output requiring external pull-up | Limited drive strength and higher board-level component count; compatible only with bidirectional reset pins | Choose only if interfacing with legacy MCUs like 68HC11 requiring open-drain reset arbitration |
Compared with MAX809TRD2+T and MAX6326UT44D2+T, the MAX6801UR44D2+T provides optimal balance of threshold accuracy, low-power operation, and direct-drive capability - making it preferred for new designs targeting 4.5V rails with minimal BOM overhead.
Availability
MAX6801UR44D2+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6801UR44D2+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 - serving industrial, automotive, and medical markets since 1983.
The MAX6800/MAX6801/MAX6802 family delivers ultra-low-power, single-function supervisory circuits for microprocessor reset - engineered specifically for space-constrained, battery-sensitive, and high-reliability embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6801UR44D2+T and how tightly is it specified?
The MAX6801UR44D2+T has a factory-trimmed reset threshold of 4.38V, with ±1.8% tolerance at +25°C and ±3% over the full –40°C to +125°C operating range. This specification is guaranteed by design and verified per Table 1 in the datasheet, ensuring consistent brownout detection across environmental conditions without external calibration.
Does MAX6801UR44D2+T require any external components to function?
No, the MAX6801UR44D2+T operates autonomously with only VCC, GND, and RESET connections - no external capacitors, resistors, or timing components are needed. Its internal comparator, reference, and timeout circuitry are fully integrated, reducing BOM count and PCB area versus discrete reset solutions.
Can MAX6801UR44D2+T maintain valid reset output when VCC drops below 1.0V?
Yes, the MAX6801UR44D2+T guarantees correct RESET assertion down to VCC = 0.7V, with VOL ≤0.4V at ISINK = 50µA. This ensures fail-safe behavior during deep brownout events where other supervisors may release reset prematurely, preserving system integrity in critical shutdown sequences.
What is the meaning of the "D2" suffix in MAX6801UR44D2+T?
The "D2" in MAX6801UR44D2+T denotes a factory-programmed 20ms minimum reset timeout period. Per Maxim's ordering convention, D1 = 1ms, D2 = 20ms, D3 = 100ms - all guaranteed over temperature and voltage, with typical values of 30ms and max of 40ms at +25°C.
Is MAX6801UR44D2+T pin-compatible with older Maxim reset ICs?
Yes, MAX6801UR44D2+T uses the standard 3-pin SOT23 package and shares identical pinout (GND, RESET, VCC) with MAX809/MAX810 and MAX6326/MAX6327 families. This enables drop-in replacement in existing layouts without PCB revision, provided the reset threshold and timeout requirements align.
MAX6801UR44D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6801UR44D2+T FAQ
1.How can I place an order for MAX6801UR44D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6801UR44D2+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 MAX6801UR44D2+T reliable?
The price and inventory of MAX6801UR44D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6801UR44D2+T is usually 5 days.
3.What payment methods are accepted for MAX6801UR44D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6801UR44D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6801UR44D2+T?
MAX6801UR44D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6801UR44D2+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 MAX6801UR44D2+T?
For technical support, including MAX6801UR44D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6801UR44D2+T requirements.
6.How does Aetrix verify that MAX6801UR44D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6801UR44D2+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 MAX6801UR44D2+T meets industry standards.
7.What is the process for return or replacement of MAX6801UR44D2+T?
All MAX6801UR44D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6801UR44D2+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 MAX6801UR44D2+T part is unused and in its original packaging.
Return procedure for MAX6801UR44D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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