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Analog Devices Inc./Maxim Integrated MAX6803US29D3+
- Part No.:
- MAX6803US29D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6803US29D3+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,513
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Product details
Overview
MAX6803US29D3+ from Maxim Integrated is a push/pull, active-high microprocessor supervisory circuit designed for precise 2.93V power-supply monitoring in embedded systems. It asserts RESET when VCC falls below 2.93V or MR is pulled low, maintains reset for ≥100ms after recovery, and operates down to 0.7V supply-enabling reliable brownout detection in battery-powered controllers and industrial µC applications.
For engineers reviewing the MAX6803US29D3+ datasheet, MAX6803US29D3+ pinout, MAX6803US29D3+ application, or MAX6803US29D3+ equivalent, key selection criteria include its factory-trimmed 2.93V threshold, guaranteed 100ms minimum reset timeout, active-high push/pull output, ultra-low 4µA supply current, and SOT143 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6803US29D3+ implements a precision bandgap-based voltage comparator with ±1.8% threshold accuracy at +25°C and ±3% over –40°C to +125°C. Its internal 20kΩ MR pullup eliminates external components, and reset propagation delay is ≤30µs for VCC falling at 10V/ms.
Reset assertion is immune to transients <100µs wide (at 100mV overdrive), and the push/pull output delivers VOH ≥0.8×VCC (ISOURCE = 1µA) and VOL ≤0.4V (ISINK = 3.2mA), ensuring robust interfacing with high-impedance µP reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.8% at +25°C; enables accurate 3.3V rail monitoring with margin |
| Reset Timeout Period | ≥100ms min; ensures full µP initialization before release |
| Supply Voltage Range | 0.7V to 5.5V; supports operation during deep brownout and battery discharge |
| Supply Current | 4µA typical at VCC = 3.0V; minimizes quiescent load in always-on monitoring |
| Output Type | Active-high push/pull; drives µP reset pin directly without external pullup |
| Operating Temperature | –40°C to +125°C; qualified for automotive under-hood and industrial control environments |
| MR Input Logic | Active-low with 20kΩ internal pullup; simplifies manual reset with momentary switch to GND |
Pinout & Package
MAX6803US29D3+ is housed in a 4-pin SOT143 package (U4-1 outline, 21-0052 land pattern), measuring 1.3mm × 2.1mm × 0.9mm, suitable for high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage |
| 2 | RESET | Active-high push/pull output; drives high during reset, low otherwise; no external pullup needed |
| 3 | MR | Manual-reset input; logic low asserts reset; internally pulled up to VCC (20kΩ) |
| 4 | VCC | Power supply input; monitored for brownout; powers internal circuitry down to 0.7V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.93V threshold | Eliminates calibration effort and external resistor dividers for 3.3V system monitoring |
| 100ms minimum reset timeout | Guarantees sufficient hold time for slow-starting µPs and peripheral initialization |
| 0.7V minimum operating voltage | Ensures valid RESET assertion even as battery voltage collapses below 1V |
| Debounced MR input | Accepts mechanical switch inputs without external RC filtering or firmware debouncing |
| Transient-immune comparator | Rejects VCC glitches <100µs wide, preventing spurious resets in noisy power environments |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Programmable logic controllers operating in factory-floor environments with fluctuating 24VDC-derived 3.3V rails. IC Role / Device Role / Timing Role: Monitors 3.3V VCC and asserts active-high RESET to halt CPU execution during brownout, holding reset ≥100ms for safe state recovery. Use Value: Prevents corrupted I/O writes and firmware lockup by guaranteeing reset validity down to 0.7V supply and rejecting fast transients. |
Use Scenario: Remote environmental sensors powered by lithium-thionyl chloride cells discharging from 3.6V to 2.0V over years. IC Role / Device Role / Timing Role: Detects end-of-life voltage drop below 2.93V and triggers controlled shutdown via active-high RESET signal to MCU. Use Value: Ultra-low 4µA ICC extends battery life; 100ms timeout ensures EEPROM save completion before power loss. |
| Medical Infusion Pumps | Automotive Body Control Modules |
Use Scenario: Life-critical infusion devices requiring fail-safe power-up sequencing and brownout response per IEC 62304. IC Role / Device Role / Timing Role: Supervises 3.3V logic rail and provides deterministic active-high RESET to ARM Cortex-M4 during undervoltage events. Use Value: ±3% threshold tolerance over –40°C to +125°C ensures compliance across storage, transport, and operating conditions. |
Use Scenario: Under-dash BCMs exposed to cold cranking (VCC dip to 1.8V) and load dump transients. IC Role / Device Role / Timing Role: Asserts RESET on VCC fall below 2.93V and holds ≥100ms post-recovery to reinitialize CAN and LIN peripherals. Use Value: Push/pull output drives reset bus directly; 0.7V operation guarantees reset assertion even during extreme cold-crank dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811SEUS+T | 2.93V threshold, 140ms timeout, active-low open-drain output | Requires external pullup; not compatible with active-high reset inputs | Select only if system design uses active-low reset and can accommodate open-drain drive |
| TPS3808G33DBVR | 3.3V threshold, 200ms timeout, active-high push/pull, 1.8V–6.0V VCC range | Higher threshold unsuitable for 2.93V margin-critical 3.3V rails; wider VCC range adds flexibility | Prefer when 3.3V nominal rail monitoring is acceptable and extended VCC range is required |
Compared with MAX811SEUS+T and TPS3808G33DBVR, the MAX6803US29D3+ uniquely combines exact 2.93V threshold, guaranteed 100ms timeout, active-high push/pull output, and 0.7V operation-making it optimal for legacy 3.3V µP systems where reset polarity and brownout sensitivity are tightly specified.
Availability
MAX6803US29D3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical infusion pumps, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX6803US29D3+ 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 demanding industrial, automotive, and medical applications.
The MAX6803 series targets cost-sensitive, space-constrained µP supervisory needs-delivering factory-trimmed thresholds, ultra-low power, and guaranteed reset behavior across extreme temperatures.
FAQ
What is the factory-trimmed reset threshold voltage of the MAX6803US29D3+?
The MAX6803US29D3+ has a factory-trimmed reset threshold of 2.93V, with ±1.8% accuracy at +25°C and ±3% over the full –40°C to +125°C temperature range. This value is confirmed in Table 1 of the datasheet and matches the "29" suffix in the part number. The MAX6803US29D3+ uses this precise threshold to monitor 3.3V power rails with appropriate safety margin.
Does the MAX6803US29D3+ require an external pullup resistor on the RESET pin?
No, the MAX6803US29D3+ does not require an external pullup resistor on the RESET pin because it features an active-high push/pull output stage. The internal driver sources current to assert RESET high during fault conditions and sinks current to drive it low otherwise. This eliminates external components and ensures deterministic logic levels without reliance on board-level pullups.
What is the minimum supply voltage at which the MAX6803US29D3+ guarantees correct RESET output state?
The MAX6803US29D3+ guarantees correct RESET output state down to 0.7V VCC, as explicitly stated in the General Description and Electrical Characteristics sections. This capability allows the device to assert a valid active-high RESET signal even as the supply collapses during battery depletion or severe brownout-critical for fail-safe shutdown in portable equipment.
How long does the RESET signal remain asserted after VCC recovers above 2.93V?
The RESET signal of the MAX6803US29D3+ remains asserted for a minimum of 100ms after VCC rises above the 2.93V threshold. This is defined by the "D3" suffix and confirmed in the Electrical Characteristics table as tRP = 100/150/200ms (min/typ/max). The guaranteed 100ms hold time ensures complete µP and peripheral initialization before release.
Is the manual-reset (MR) input of the MAX6803US29D3+ internally pulled up, and what is its resistance value?
Yes, the MR input of the MAX6803US29D3+ includes an internal 20kΩ pullup resistor to VCC, as documented in the Applications Information section. This allows direct connection of a momentary switch from MR to GND without external components. The pullup ensures MR defaults high (no reset) when unconnected, and the 20kΩ value balances noise immunity with low standby current draw.
MAX6803US29D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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 High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6803US29D3+ FAQ
1.How can I place an order for MAX6803US29D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6803US29D3+ 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 MAX6803US29D3+ reliable?
The price and inventory of MAX6803US29D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6803US29D3+ is usually 5 days.
3.What payment methods are accepted for MAX6803US29D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6803US29D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6803US29D3+?
MAX6803US29D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6803US29D3+ 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 MAX6803US29D3+?
For technical support, including MAX6803US29D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6803US29D3+ requirements.
6.How does Aetrix verify that MAX6803US29D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6803US29D3+ 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 MAX6803US29D3+ meets industry standards.
7.What is the process for return or replacement of MAX6803US29D3+?
All MAX6803US29D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6803US29D3+, 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 MAX6803US29D3+ part is unused and in its original packaging.
Return procedure for MAX6803US29D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6803US29D3+ Tags
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MIC826SYMT-TR
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