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Analog Devices Inc./Maxim Integrated MAX803ZEXR-T
- Part No.:
- MAX803ZEXR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX803ZEXR-T.pdf
- Description:
- IC SUPERVISOR MAX803 3PIN MPU
- Quantity:
- Payment:
- Shipping:
Inventory:17,428
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Product details
Overview
MAX803ZEXR-T from Maxim Integrated is a precision microprocessor supervisory circuit with open-drain active-low RESET output, designed to monitor +2.5V power supplies. It asserts reset when VCC falls below 2.32V (typ), holds reset for ≥140ms after VCC recovers, operates down to VCC = 1V, draws only 17µA (typ) at +25°C, and is qualified for automotive-grade operation from −40°C to +125°C in SC70-3 package.
For engineers reviewing the MAX803ZEXR-T datasheet, MAX803ZEXR-T pinout, MAX803ZEXR-T application, or MAX803ZEXR-T equivalent, this device serves as a low-power, high-accuracy reset supervisor for battery-powered systems, automotive ECUs, and industrial controllers where supply voltage margin and temperature stability are critical.
Technical Context
The MAX803ZEXR-T implements a precision bandgap-based reset comparator with 30ppm/°C tempco, guaranteeing threshold accuracy across its full −40°C to +125°C operating range. Its open-drain RESET output supports level-shifting and bidirectional μP interface via external pullup, and the comparator ignores transients ≤20μs (at 100mV overdrive).
It requires no external components beyond the pullup resistor, delivers guaranteed reset validity down to VCC = 1V, and features built-in immunity to fast negative-going VCC glitches-enabling robust operation in electrically noisy environments such as automotive power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (typ) at +25°C; ensures reliable reset assertion before +2.5V supply drops to 2.32V |
| Reset Timeout | ≥140ms minimum; guarantees μP remains held in reset long enough for stable power-up sequencing |
| Supply Current | 17µA (typ) at +25°C, VCC = 2.5V; enables multi-year battery life in portable instrumentation |
| Operating Temp | −40°C to +125°C; supports under-hood automotive and industrial edge-node deployment |
| Output Type | Open-drain active-low RESET; allows flexible pullup to higher voltage rails or shared reset bus |
| VCC Range | 1.2V to 5.5V; permits valid reset monitoring even during deep brownout conditions |
| Threshold Tempco | 30ppm/°C; maintains ±1.5% threshold drift over full temperature range for predictable timing |
Pinout & Package
MAX803ZEXR-T is housed in a 3-pin SC70 package (package code X3+2), with 0.65mm pitch, 1.25mm × 0.85mm footprint, and 0.95mm max height-optimized for space-constrained PCB layouts in automotive and portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane |
| 2 RESET | Open-drain active-low reset output | Sinks current when asserted; requires external pullup resistor to define logic-high voltage and enable level-shifting |
| 3 VCC | Supply input | Monitored power rail input; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.32V threshold | Enables accurate supervision of +2.5V systems without derating margin loss due to tempco or tolerance |
| 140ms min reset timeout | Meets JEDEC JESD78 reliability requirements for μP initialization timing across voltage and temperature |
| 17µA supply current | Reduces quiescent load on coin-cell or energy-harvested supplies in always-on monitoring applications |
| Valid reset to VCC = 1V | Ensures deterministic reset state during deep brownout, preventing undefined μP behavior before shutdown |
| AEC-Q100 qualified | Validated for automotive use per stress test requirements including HTOL, TC, and ESD (HBM ≥2kV) |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 2.5V sensor bias rail in engine control module exposed to under-hood thermal cycling and load dump transients. IC Role / Device Role / Timing Role: Precision reset supervisor asserting active-low RESET to MCU during supply sag or cold-cranking events. Use Value: Prevents spurious MCU execution during unstable power by holding reset until 2.5V rail stabilizes ≥140ms post-recovery. | Use Scenario: Supervises 2.5V ADC reference supply in handheld blood glucose meter powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Low-current reset generator ensuring clean boot sequence while minimizing battery drain during standby. Use Value: 17µA typical ICC extends battery life >3 years; open-drain output enables shared reset bus with other low-voltage peripherals. |
| Industrial PLC I/O Module | Smart Sensor Node |
Use Scenario: Provides fail-safe reset for ARM Cortex-M4 core in DIN-rail mounted programmable logic controller operating at −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Temperature-stable reset monitor with 30ppm/°C tempco, ensuring consistent threshold across wide industrial temperature range. Use Value: Eliminates need for recalibration or margin adjustment; guarantees reset assertion at exactly 2.32V ±0.06V from −40°C to +125°C. | Use Scenario: Supervises 2.5V LDO output powering MEMS accelerometer and BLE SoC in wireless vibration sensor deployed on rotating machinery. IC Role / Device Role / Timing Role: Brownout detector that asserts reset before supply collapse corrupts sensor data acquisition or radio transmission. Use Value: Fast transient immunity (≤20μs glitch rejection) prevents false resets from motor-induced noise on shared 2.5V rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809ZEXR-T | Push-pull active-low RESET output; identical 2.32V threshold and SC70-3 package | Eliminates need for external pullup resistor but cannot level-shift or share reset bus | Select when board layout simplicity and reduced BOM count outweigh flexibility needs |
| TPS3808G125DBVR | 2.33V threshold, 350ms reset timeout, SOT23-3 package, 1.5µA ICC | Higher timeout and ultra-low current suit ultra-low-power IoT nodes; not AEC-Q100 qualified | Select for battery-operated non-automotive applications requiring longer reset hold time and lower ICC |
Compared with MAX803ZEXR-T, MAX809ZEXR-T removes external component dependency but sacrifices interface flexibility, while TPS3808G125DBVR trades automotive qualification and compact SC70 size for extreme low-power operation and extended reset duration-making each suitable for distinct system-level trade-offs.
Availability
MAX803ZEXR-T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical monitors, industrial PLC modules, smart sensor nodes, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX803ZEXR-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 automotive, industrial, communications, and computing markets.
The MAX803 family delivers highly accurate, low-power microprocessor supervisory circuits optimized for reliable reset generation in harsh environments-including automotive under-hood, portable medical, and industrial control applications.
FAQ
What is the exact reset threshold voltage of the MAX803ZEXR-T and how does it vary with temperature?
The MAX803ZEXR-T has a nominal reset threshold of 2.32V at +25°C, with guaranteed range of 2.25V to 2.38V at −40°C to +85°C and 2.22V to 2.42V at −40°C to +125°C. Its 30ppm/°C tempco ensures predictable, linear drift-critical for maintaining reset timing integrity across automotive and industrial temperature extremes.
Does the MAX803ZEXR-T require an external pullup resistor, and if so, what value is recommended?
Yes, the MAX803ZEXR-T requires an external pullup resistor on its open-drain RESET pin. A 10kΩ to 100kΩ resistor to a compatible voltage rail (e.g., 3.3V or 5V) is typical. The value balances rise time, power consumption, and noise immunity-lower values improve speed but increase current; higher values reduce current but slow edge transitions.
Is the MAX803ZEXR-T qualified for automotive applications, and what standards does it meet?
Yes, the MAX803ZEXR-T is AEC-Q100 qualified for automotive use. It meets stress test requirements including high-temperature operating life (HTOL), temperature cycling (TC), and human-body-model ESD (≥2kV). Its −40°C to +125°C operating range and SC70 package support under-hood and body-control module deployments.
How long does the MAX803ZEXR-T hold the RESET signal active after VCC rises above the threshold?
The MAX803ZEXR-T guarantees a minimum reset timeout of 140ms after VCC rises above the reset threshold. At −40°C to +85°C, the typical timeout is 240ms, and maximum is 460ms (SC70 package). This ensures sufficient hold time for μP clock stabilization, PLL lock, and memory initialization before release.
Can the MAX803ZEXR-T operate reliably when VCC drops below 1V, and what happens to the RESET output?
The MAX803ZEXR-T guarantees correct RESET logic state down to VCC = 1V. Below 1V, the internal output transistor loses drive capability and RESET becomes high-impedance. To maintain defined logic low in such cases, a 100kΩ pull-down resistor to GND is recommended-ensuring deterministic behavior during deep brownout or controlled shutdown sequences.
MAX803ZEXR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX803ZEXR-T FAQ
1.How can I place an order for MAX803ZEXR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX803ZEXR-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 MAX803ZEXR-T reliable?
The price and inventory of MAX803ZEXR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX803ZEXR-T is usually 5 days.
3.What payment methods are accepted for MAX803ZEXR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX803ZEXR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX803ZEXR-T?
MAX803ZEXR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX803ZEXR-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 MAX803ZEXR-T?
For technical support, including MAX803ZEXR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX803ZEXR-T requirements.
6.How does Aetrix verify that MAX803ZEXR-T is sourced from the original manufacturer or authorized distributors?
All MAX803ZEXR-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 MAX803ZEXR-T meets industry standards.
7.What is the process for return or replacement of MAX803ZEXR-T?
All MAX803ZEXR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX803ZEXR-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 MAX803ZEXR-T part is unused and in its original packaging.
Return procedure for MAX803ZEXR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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