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Analog Devices Inc./Maxim Integrated MAX6801UR29D2+
- Part No.:
- MAX6801UR29D2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6801UR29D2+.pdf
- Description:
- LOW-POWER P RESET CIRCUITS
- Quantity:
- Payment:
- Shipping:
Inventory:4,675
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Product details
Overview
MAX6801UR29D2+ from Maxim Integrated is a 3-pin SOT23 push/pull active-low microprocessor supervisory circuit with 2.93V reset threshold, 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, asserting RESET during brownout and holding it for ≥20ms after VCC recovery.
For engineers reviewing the MAX6801UR29D2+ datasheet, MAX6801UR29D2+ pinout, MAX6801UR29D2+ application, or MAX6801UR29D2+ equivalent, key selection criteria include reset threshold accuracy (±1.8% at +25°C), ultra-low 4µA supply current, transient-immune reset comparator, and compatibility with bidirectional μP reset pins via push/pull drive capability.
Technical Context
The MAX6801UR29D2+ implements a factory-trimmed bandgap-based voltage comparator with hysteresis to detect VCC falling below 2.93V ±1.8%, triggering an internally timed 20ms (min) active-low RESET pulse. Its push/pull output drives CMOS inputs directly without external pull-up resistors.
Designed for BiCMOS process, the device guarantees valid RESET/RESET states over -40°C to +125°C and maintains functional integrity during fast VCC transients (e.g., ≤30µs at 100mV overdrive). It requires no external components and draws only 4µA at 3.0V, enabling battery-critical designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.8% at +25°C; ensures reliable brownout detection for 3.0V/3.3V systems |
| Reset Timeout Period | 20ms (min); meets JEDEC JESD78 requirement for µP initialization hold time |
| Supply Voltage Range | 0.7V to 5.5V; enables operation during deep brownout and full-system power sequencing |
| Supply Current | 4µA at VCC = 3.0V; minimizes quiescent drain in always-on monitoring circuits |
| Output Type | Push/pull active-low RESET; eliminates need for external pull-up and supports direct CMOS interface |
| Operating Temperature | -40°C to +125°C; qualified for automotive under-hood and industrial control environments |
| VCC Propagation Delay | 30µs max at 10V/ms VCC fall rate; rejects sub-30µs noise spikes on power rail |
Pinout & Package
MAX6801UR29D2+ is housed in a RoHS-compliant 3-pin SOT23 package (outline 21-0051, land pattern 90-0179), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads optimized for automated assembly and thermal performance in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 - RESET | Active-low push/pull reset output | Drives low during VCC fault and remains low ≥20ms after VCC recovery; sinks up to 1.2mA at VCC ≥ 2.5V |
| 3 - VCC | Supply voltage input | Monitored power rail input; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.93V with ±1.8% tolerance at +25°C and ±3% over full temperature range, eliminating manual calibration |
| Ultra-low operating voltage | Functional down to VCC = 0.7V ensures reset assertion even during severe brownout conditions before µP lockup |
| Transient-immune comparator | Rejects VCC glitches ≤30µs at 100mV overdrive, preventing false resets in noisy power environments |
| No external components required | Integrated timing capacitor and comparator eliminate BOM cost and board area vs. discrete RC reset solutions |
| Guaranteed reset validity | RESET output remains valid (low) throughout VCC decay to 0.7V, ensuring deterministic µP behavior during power loss |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Programmable logic controllers operating in factory-floor environments with fluctuating 3.3V/5V rails and EMI-induced supply noise. IC Role / Device Role / Timing Role: Monitors main VCC and asserts active-low RESET to halt CPU execution during undervoltage, then holds reset ≥20ms for clean restart. Use Value: Prevents corrupted I/O state and firmware crashes by guaranteeing µP reset initiation before VCC drops below 2.93V and sustaining it through recovery. |
Use Scenario: Remote environmental sensors powered by coin-cell batteries where supply voltage decays gradually from 3.0V to 2.0V over weeks. IC Role / Device Role / Timing Role: Detects crossing of 2.93V threshold during battery depletion and triggers controlled shutdown sequence via µP interrupt or reset. Use Value: Enables graceful data save and flash write completion before power collapse, leveraging 0.7V operational floor and 4µA quiescent current. |
| Medical Point-of-Care Devices | Automotive Body Control Modules |
Use Scenario: Portable diagnostic instruments with dual 3.3V logic and 5.0V analog rails requiring synchronized reset across subsystems. IC Role / Device Role / Timing Role: Primary supervisor for main processor domain; RESET output coordinates power-on initialization and brownout recovery across mixed-voltage ICs. Use Value: Ensures deterministic boot sequence and eliminates race conditions between µP, ADC, and communication peripherals during marginal supply conditions. |
Use Scenario: Under-dash BCMs exposed to load-dump and cold-crank transients where 5V rail dips to 2.5V for 50ms during engine start. IC Role / Device Role / Timing Role: Resets microcontroller when VCC falls below 2.93V during cranking, then enforces 20ms minimum reset hold to prevent premature wake-up. Use Value: Meets ISO 16750-2 cold-crank immunity requirements while maintaining valid reset signal down to 0.7V VCC during worst-case transients. |
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 | 2.93V threshold, 240ms min reset timeout, same SOT23-3 push/pull active-low output | Longer timeout better suited for slower µPs or systems requiring extended initialization; less suitable for fast-recovery embedded control loops | Select MAX809TRD2+T if system boot firmware requires >20ms reset hold; otherwise MAX6801UR29D2+ offers tighter timing control and lower ICC |
| TPS3808G33DBVR | 3.3V threshold, 20ms min timeout, open-drain output, higher 8µA ICC, wider -40°C to +125°C spec | Requires external pull-up; incompatible with direct-drive CMOS inputs; designed for TI ecosystem integration | Choose TPS3808G33DBVR only when 3.3V threshold matches system rail and open-drain flexibility is needed; MAX6801UR29D2+ provides superior drive strength and lower power |
Compared with MAX809TRD2+T and TPS3808G33DBVR, the MAX6801UR29D2+ delivers precise 2.93V detection with minimal 4µA supply current and robust push/pull drive-making it optimal for space- and power-constrained 3.0V/3.3V systems requiring deterministic, short-duration reset assertion.
Availability
MAX6801UR29D2+ is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical point-of-care devices, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6801UR29D2+ 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, mixed-signal, and power management ICs for industrial, automotive, and computing applications, emphasizing high reliability and low-power operation.
The MAX6800/MAX6801/MAX6802 family delivers compact, single-function µP supervisory circuits for cost-sensitive, space-constrained systems needing guaranteed reset behavior across wide temperature and voltage ranges.
FAQ
What is the exact reset threshold voltage of MAX6801UR29D2+ and how tightly is it specified?
The MAX6801UR29D2+ has a factory-trimmed nominal reset threshold of 2.93V, with tolerance of ±1.8% at +25°C and ±3% over the full -40°C to +125°C operating range. This specification ensures consistent brownout detection across production units and temperature extremes without external calibration. The MAX6801UR29D2+ achieves this using laser-trimmed bandgap references in its BiCMOS process.
Does MAX6801UR29D2+ require any external components to function as a reset supervisor?
No, the MAX6801UR29D2+ operates autonomously with no external components required. Its internal timing circuit generates the 20ms (min) reset pulse width, and the push/pull output drives CMOS inputs directly-eliminating the need for pull-up resistors, capacitors, or voltage dividers. This simplifies design, reduces BOM cost, and improves reliability compared to discrete reset solutions.
How does MAX6801UR29D2+ behave when VCC drops below 1.0V, and why is that important?
The MAX6801UR29D2+ remains fully functional down to VCC = 0.7V, guaranteeing valid active-low RESET assertion even during deep brownout. Below 1.0V, many competing supervisors lose output drive strength or become undefined-but the MAX6801UR29D2+ maintains correct logic state, preventing µP latch-up or undefined behavior during critical power collapse. This makes MAX6801UR29D2+ especially valuable in battery-fail-safe systems.
Can MAX6801UR29D2+ replace MAX809 in existing designs without layout changes?
Yes, the MAX6801UR29D2+ is pin-compatible with MAX809 series devices in the SOT23-3 package and shares identical pinout (GND, RESET, VCC). However, note that MAX6801UR29D2+ offers 20ms reset timeout versus MAX809's 240ms, so firmware timing assumptions may require review. Electrical compatibility is maintained: both use push/pull active-low outputs and operate over the same voltage/temperature range.
What is the maximum VCC slew rate the reset comparator in MAX6801UR29D2+ can tolerate without false triggering?
The MAX6801UR29D2+ reset comparator is designed to ignore fast transients on VCC, with guaranteed immunity to glitches ≤30µs duration when the overdrive is 100mV. At higher overdrive levels (e.g., 200mV), the maximum tolerable glitch width decreases per the "Maximum Transient Duration vs. Reset Comparator Overdrive" curve in the datasheet. This ensures robust operation in electrically noisy environments like motor drives or switching power supplies.
MAX6801UR29D2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX6801UR29D2+ FAQ
1.How can I place an order for MAX6801UR29D2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6801UR29D2+ 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 MAX6801UR29D2+ reliable?
The price and inventory of MAX6801UR29D2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6801UR29D2+ is usually 5 days.
3.What payment methods are accepted for MAX6801UR29D2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6801UR29D2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6801UR29D2+?
MAX6801UR29D2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6801UR29D2+ 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 MAX6801UR29D2+?
For technical support, including MAX6801UR29D2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6801UR29D2+ requirements.
6.How does Aetrix verify that MAX6801UR29D2+ is sourced from the original manufacturer or authorized distributors?
All MAX6801UR29D2+ 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 MAX6801UR29D2+ meets industry standards.
7.What is the process for return or replacement of MAX6801UR29D2+?
All MAX6801UR29D2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6801UR29D2+, 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 MAX6801UR29D2+ part is unused and in its original packaging.
Return procedure for MAX6801UR29D2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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