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Analog Devices Inc./Maxim Integrated MAX6808UR32-T
- Part No.:
- MAX6808UR32-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6808UR32-T.pdf
- Description:
- MAX6808 VOLTAGE DETECTOR
- Quantity:
- Payment:
- Shipping:
Inventory:5,300
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Product details
Overview
MAX6808UR32-T from Maxim Integrated is a precision voltage detector IC designed for power-supply monitoring in microprocessor-based systems. It features a factory-preset 3.2V ±2% reset threshold, active-low open-drain RESET output, and guaranteed operation down to VCC = 1.0V. Its 35µA supply current and internal hysteresis support reliable brownout detection in battery-powered instrumentation and portable controllers.
For engineers reviewing the MAX6808UR32-T datasheet, MAX6808UR32-T pinout, MAX6808UR32-T application, or MAX6808UR32-T equivalent, key selection criteria include reset threshold accuracy (±2%), open-drain output compatibility with multi-rail systems, VCC-down-to-1V validity, immunity to negative-going transients, and SOT23-3 package footprint constraints.
Technical Context
The MAX6808UR32-T implements a precision bandgap-based voltage comparator with internal hysteresis (VHYST = 0.02–0.03 × VTH−), ensuring stable reset assertion/deassertion during supply ramping. Its open-drain RESET output requires an external pullup and supports interfacing with µPs having bidirectional reset I/O or mixed-voltage logic domains.
It operates across −40°C to +85°C with supply voltage range 1.2V to 5.5V (TA = −40°C to +85°C), and exhibits 30ppm/°C reset threshold tempco. The device draws only 35µA typical supply current at VCC = 3.6V and remains functional through VCC decay to 1.0V - critical for orderly system shutdown in low-power embedded applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.20V ±2% (VTH−), factory-trimmed - ensures accurate power-fail detection for 3.3V systems with ±5% regulation. |
| Output Type | Active-low, open-drain - enables wired-OR reset buses and level-shifting across multiple supply rails (e.g., 3.3V µP + 5V peripheral). |
| Supply Range | 1.2V to 5.5V (−40°C to +85°C) - supports operation during deep brownout and compatibility with Li-ion, coin-cell, and regulated DC supplies. |
| Supply Current | 35µA typical at VCC = 3.6V - minimizes quiescent drain in always-on monitoring circuits for portable equipment. |
| Hysteresis | 0.02–0.03 × VTH− - prevents output chatter near threshold during slow-ramping or noisy supplies. |
| RESET Validity | Guaranteed logic-low output down to VCC = 1.0V - maintains deterministic reset state through full power collapse. |
| Transient Immunity | Immune to negative-going VCC transients ≤100µs (at 100mV overdrive) - eliminates false resets from switching noise or load dumps. |
Pinout & Package
MAX6808UR32-T is housed in a 3-pin SOT23 package (package code U3-1), RoHS-compliant, tape-and-reel packaged (2500 pcs minimum). Pin 1 = RESET (active-low open-drain), Pin 2 = GND, Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low open-drain output | Sinks current when VCC < 3.2V; requires external pullup to any rail ≤6V; enables shared reset bus and voltage-level translation. |
| 2 (GND) | Ground reference | Return path for internal circuitry and RESET sink current; must be low-impedance to ensure accurate threshold sensing. |
| 3 (VCC) | Supply voltage input | Monitored rail input; absolute max rating −0.3V to +6.0V; valid operation begins at 1.2V (−40°C to +85°C). |
Key Features
| Feature | Design Value |
|---|---|
| ±2% reset threshold accuracy | Factory-trimmed bandgap reference ensures precise power-fail detection without calibration or external resistors. |
| Open-drain RESET output | Enables direct interface to bidirectional µP reset pins (e.g., Motorola 68HC11) and multi-voltage reset networks. |
| VCC-down-to-1.0V operation | Maintains valid reset assertion through complete power collapse - essential for nonvolatile memory write completion and safe shutdown. |
| No external components required | Eliminates discrete comparators, resistors, and capacitors - reduces BOM count, PCB area, and qualification effort. |
| Immunity to negative VCC transients | Withstands ≤100µs dips below threshold without false triggering - improves robustness in electrically noisy environments. |
Applications
| Portable/Battery-Powered Equipment | Intelligent Instruments |
|---|---|
|
Use Scenario: Monitoring Li-ion battery discharge in handheld test meters to prevent data corruption during low-voltage shutdown. IC Role / Device Role / Timing Role: Voltage detector asserting reset before MCU brownout, enabling controlled flash save and display blanking. Use Value: 35µA quiescent current extends battery life; 1.0V VCC validity ensures reset remains asserted until power fully collapses. |
Use Scenario: Power supervision in benchtop multimeters with dual 3.3V/5V rails and EEPROM-backed calibration storage. IC Role / Device Role / Timing Role: Open-drain RESET tied to both µP and FPGA reset inputs via shared pullup, synchronizing power-fail response. Use Value: Eliminates need for dual-reset logic; ±2% threshold guarantees detection before ADC or reference ICs exit spec. |
| Critical µP and µC Systems | Bar-Code Scanners |
|
Use Scenario: Ensuring deterministic boot sequence in industrial PLC controllers after AC line interruption or capacitor hold-up decay. IC Role / Device Role / Timing Role: Primary reset source for ARM Cortex-M7 MCU, replacing RC-based solutions prone to temperature drift. Use Value: 30ppm/°C tempco and internal hysteresis prevent spurious resets during thermal cycling or marginal supply conditions. |
Use Scenario: Supervising 3.3V logic rail in laser-based barcode scanners subject to motor-induced supply transients. IC Role / Device Role / Timing Role: Detecting brief VCC sags caused by laser diode pulsing or motor commutation spikes. Use Value: Immunity to ≤100µs negative transients avoids false resets that would interrupt scan continuity or require host reinitialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US32D3-T | Same 3.2V threshold, push-pull active-low output, 1.1V min VCC, 1.6µA ICC | Lacks open-drain flexibility; not suitable for wired-OR or multi-rail reset buses | Select when lowest quiescent current is critical and single-rail reset suffices. |
| TLV803EB32DBZR | 3.2V threshold, ±1% accuracy, push-pull active-low, 0.9V min VCC, 0.5µA ICC | Higher accuracy but no open-drain option; incompatible with bidirectional µP reset pins | Choose for ultra-low-power applications where reset bus sharing is unnecessary. |
Compared with MAX6808UR32-T, MAX6315US32D3-T offers lower supply current but forfeits open-drain versatility, while TLV803EB32DBZR delivers tighter threshold tolerance yet lacks the critical interface flexibility for complex reset architectures.
Availability
MAX6808UR32-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instruments, critical µP and µC systems, and bar-code scanners requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for MAX6808UR32-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, mixed-signal, and power-management ICs for demanding industrial, computing, and communications applications.
The MAX6806/MAX6807/MAX6808 family delivers highly accurate, low-power voltage detection for microprocessor supervisory functions - optimized for reliability-critical embedded systems where supply integrity directly impacts data integrity and safety.
FAQ
What is the exact reset threshold voltage of the MAX6808UR32-T?
The MAX6808UR32-T has a factory-preset nominal reset threshold of 3.20V, with guaranteed accuracy of ±2% (3.136V to 3.264V) at +25°C. This value is trimmed during production using Maxim's precision bandgap reference and applies specifically to the falling VCC condition (VTH−), ensuring reliable detection of supply undervoltage events in 3.3V systems.
Does the MAX6808UR32-T support operation below 1.2V?
Yes - the MAX6808UR32-T guarantees valid active-low RESET output down to VCC = 1.0V across the full −40°C to +85°C temperature range. Below 1.0V, the output becomes high-impedance; for applications requiring asserted reset down to ground, a 100kΩ pulldown resistor on the RESET line is recommended per Maxim's application guidance.
Why does the MAX6808UR32-T use an open-drain output instead of push-pull?
The MAX6808UR32-T uses an open-drain RESET output to enable wired-OR configuration with other reset sources, support level translation across different supply rails (e.g., 3.3V µP and 5V peripherals), and safely interface with microprocessors having bidirectional reset I/O pins - such as the Motorola 68HC11 - avoiding contention that occurs with push-pull drivers.
Can the MAX6808UR32-T replace the MAX6806UR32-T in an existing design?
No - the MAX6808UR32-T cannot directly replace the MAX6806UR32-T without board-level changes. While both share identical threshold and package, the MAX6806UR32-T has an active-low push-pull output requiring no external pullup, whereas the MAX6808UR32-T requires an external pullup resistor and behaves differently under bus-sharing or bidirectional reset scenarios.
What package and marking does the MAX6808UR32-T use?
The MAX6808UR32-T is supplied in a 3-pin SOT23 package (U3-1 outline) with tape-and-reel packaging (2500-piece minimum order). Its top-marking code is "FZFL", as specified in Maxim's Selector Guide, uniquely identifying it as the 3.2V threshold variant in SOT23 form factor.
MAX6808UR32-T 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:
- -
- Type:
- Voltage Detector
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.2V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 30µs Typical
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6808UR32-T FAQ
1.How can I place an order for MAX6808UR32-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6808UR32-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 MAX6808UR32-T reliable?
The price and inventory of MAX6808UR32-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6808UR32-T is usually 5 days.
3.What payment methods are accepted for MAX6808UR32-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6808UR32-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6808UR32-T?
MAX6808UR32-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6808UR32-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 MAX6808UR32-T?
For technical support, including MAX6808UR32-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6808UR32-T requirements.
6.How does Aetrix verify that MAX6808UR32-T is sourced from the original manufacturer or authorized distributors?
All MAX6808UR32-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 MAX6808UR32-T meets industry standards.
7.What is the process for return or replacement of MAX6808UR32-T?
All MAX6808UR32-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6808UR32-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 MAX6808UR32-T part is unused and in its original packaging.
Return procedure for MAX6808UR32-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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