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Analog Devices Inc./Maxim Integrated MAX6808US26
- Part No.:
- MAX6808US26
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6808US26.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,471
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Product details
Overview
MAX6808US26 from Maxim Integrated is a precision voltage detector IC designed for power-supply monitoring in microprocessor-based systems. It features a factory-preset 2.6V ±2% reset threshold, active-low open-drain RESET output, and guaranteed operation down to VCC = 1.0V - enabling reliable brownout detection in battery-powered instrumentation and portable equipment.
For engineers reviewing the MAX6808US26 datasheet, MAX6808US26 pinout, MAX6808US26 application, or MAX6808US26 equivalent, key selection considerations include its open-drain output architecture for bidirectional µP reset interfaces, manual-reset capability in SOT143 packaging, and immunity to sub-100µs negative-going VCC transients.
Technical Context
The MAX6808US26 implements a precision bandgap-based voltage comparator with internal hysteresis (VHYST = 0.02–0.03 × VTH−), ensuring stable reset assertion/deassertion during supply ramp-up and brownout conditions. Its open-drain RESET output requires an external pullup and supports level-shifting across supplies up to 6V.
This variant is specifically configured in the 4-pin SOT143 package with integrated MR (manual reset) input, 80kΩ internal pulldown resistor, and logic-compatible MR thresholds (VIL = 0.6V, VIH = 0.7×VCC). It shares core electrical specs with the MAX6806/MAX6807 family but differs in output topology and MR availability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.60V ±2% (VTH− at +25°C); ensures accurate detection of 2.5V ±10% supply collapse before system ICs fail |
| Supply Voltage Range | 1.0V to 5.5V (−40°C to +85°C); enables valid reset signaling even during deep brownout or single-cell Li-ion discharge |
| Supply Current | 35µA typical at VCC = 3.6V; minimizes quiescent load in always-on monitoring paths |
| RESET Output Type | Active-low open-drain; allows wired-OR configuration, level translation, and safe interfacing with bidirectional µP reset pins |
| MR Input Support | Available only in SOT143 package; 80kΩ internal pulldown enables momentary switch reset without external components |
| Hysteresis | 0.02–0.03 × VTH−; prevents output chatter near threshold during slow-ramping or noisy supplies |
| Transient Immunity | Immune to negative-going VCC transients ≤100µs at 100mV overdrive; eliminates false resets from switching noise |
Pinout & Package
MAX6808US26 is packaged in a 4-pin SOT143 surface-mount package with exposed pad (RoHS-compliant, moisture sensitivity level 1). Pin 1 is RESET, Pin 2 is GND, Pin 3 is VCC, and Pin 4 is MR.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low open-drain output | Sinks current when VCC < VTH−; requires external pullup to define high state and drive load |
| 2 (GND) | Ground reference | Return path for internal circuitry and MR input; must be low-impedance for accurate threshold stability |
| 3 (VCC) | Supply voltage input | Monitored rail; operates from 1.0V to 5.5V; absolute max rating −0.3V to +6.0V |
| 4 (MR) | Active-high manual reset input | Asserts RESET when pulled ≥0.7×VCC; internally pulldown (80kΩ) - float-safe if unused |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.6V threshold | ±2% accuracy over −40°C to +85°C eliminates calibration and reduces BOM count |
| Open-drain RESET output | Enables direct interface to bidirectional µP reset I/O (e.g., Motorola 68HC11) without contention |
| Manual reset input (MR) | Integrated 80kΩ pulldown allows momentary switch reset without external resistors or logic |
| Low 35µA supply current | Extends battery life in portable instruments and barcode scanners operating from coin cells or Li-ion |
| VCC transient immunity | Rejects <100µs negative spikes down to 100mV below VTH−, preventing false resets in noisy SMPS environments |
Applications
| Portable Power Monitoring | Intelligent Instrumentation |
|---|---|
|
Use Scenario: Real-time voltage supervision in handheld multimeters and portable oscilloscopes powered by dual AA/AAA or single Li-ion cells. IC Role / Device Role / Timing Role: Precision 2.6V brownout detector triggering controlled shutdown before ADC or display ICs malfunction. Use Value: Prevents data corruption and EEPROM write errors during battery depletion by asserting RESET before VCC drops below 2.5V system minimum. |
Use Scenario: Embedded controller supervision in industrial handheld analyzers with isolated sensor front-ends and RS-485 communication. IC Role / Device Role / Timing Role: System-level power integrity monitor coordinating µC reset, analog front-end power gating, and fault logging. Use Value: Guarantees clean reset initiation at 2.6V with 20µs delay, synchronizing firmware recovery with analog supply stabilization. |
| Barcode Scanner Supervision | Critical µP Power Monitoring |
|
Use Scenario: Reset management in battery-operated laser barcode scanners subject to rapid on/off cycling and motor-induced supply droop. IC Role / Device Role / Timing Role: Open-drain RESET output wired-OR'd with other supervisors to drive shared reset bus across multiple ASICs. Use Value: Eliminates need for external logic gates or level shifters while supporting 3.3V/5V mixed-voltage reset domains. |
Use Scenario: Primary reset source for ARM Cortex-M0+ microcontrollers in medical diagnostic devices requiring IEC 62304 compliance. IC Role / Device Role / Timing Role: Fail-safe voltage monitor with manual reset override for field service and production test modes. Use Value: MR pin enables technician-initiated reset without power cycle, reducing downtime during calibration and firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6806US26-T | Active-low push-pull RESET output; no MR pin in SOT143 variant per datasheet | Lacks manual reset capability; unsuitable where field-service reset is required | Select MAX6806US26-T only when push-pull drive is needed and MR is unnecessary |
| TPS3808G26DBVR | 2.63V threshold (±0.5%), 1.8–6.0V VCC range, 1.6µA quiescent current, no MR in SOT-23 | Lower ICC benefits ultra-low-power designs; lacks MR and open-drain flexibility | Choose TPS3808G26DBVR for energy-constrained IoT sensors where MR and level shifting are not needed |
Compared with MAX6806US26-T and TPS3808G26DBVR, the MAX6808US26 uniquely combines open-drain output, factory-trimmed 2.6V threshold, and integrated MR in a compact SOT143 - making it optimal for portable instruments requiring both robust brownout response and field-service reset capability.
Availability
MAX6808US26 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instrumentation, critical µP power monitoring, and barcode scanner designs requiring stable component supply and long-term lifecycle support.
Supply support for MAX6808US26 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX6806/MAX6807/MAX6808 family was engineered to replace discrete reset circuits in space-constrained digital systems - delivering precision voltage monitoring with zero external components and guaranteed operation down to 1V supply.
FAQ
What is the exact reset threshold voltage of the MAX6808US26?
The MAX6808US26 has a factory-preset nominal reset threshold of 2.60V with ±2% accuracy over temperature (−40°C to +85°C), meaning the actual falling threshold (VTH−) is guaranteed between 2.548V and 2.652V at +25°C. This value is laser-trimmed during production and applies specifically to the MAX6808US26 variant in the SOT143 package.
Does the MAX6808US26 support manual reset functionality?
Yes, the MAX6808US26 includes a dedicated MR (manual reset) input on Pin 4 of its 4-pin SOT143 package. The MR pin is active-high with a guaranteed VIH of 0.7×VCC and features an internal 80kΩ pulldown resistor - allowing direct connection of a momentary switch to VCC without external components. This function is not available in SC70 or SOT23 variants of the MAX6808.
Why does the MAX6808US26 use an open-drain RESET output instead of push-pull?
The MAX6808US26 uses an open-drain RESET output to safely interface with microprocessors that have bidirectional reset I/O pins (e.g., Motorola 68HC11), avoiding bus contention. It also enables wired-OR reset busing across multiple voltage domains and supports level translation up to 6V via external pullup - capabilities not possible with push-pull outputs like those in the MAX6806US26-T.
What is the minimum supply voltage at which the MAX6808US26 guarantees valid RESET output?
The MAX6808US26 guarantees valid RESET output down to VCC = 1.0V. Below this voltage, the internal circuitry ceases sinking current and the RESET pin becomes high-impedance. For applications requiring asserted RESET down to 0V, a 100kΩ external pulldown resistor on the RESET line is recommended - a design detail explicitly documented in the MAX6808US26 datasheet Figure 4.
Can the MAX6808US26 be used in place of the MAX6806US26-T?
The MAX6808US26 is not a drop-in replacement for the MAX6806US26-T due to fundamental output topology differences: MAX6806US26-T has active-low push-pull RESET, while MAX6808US26 has active-low open-drain RESET requiring an external pullup. Additionally, the MAX6806US26-T SOT143 variant does not include MR functionality. PCB layout and schematic changes are required for substitution.
MAX6808US26 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.6V
- 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-23-4
MAX6808US26 FAQ
1.How can I place an order for MAX6808US26 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6808US26 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 MAX6808US26 reliable?
The price and inventory of MAX6808US26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6808US26 is usually 5 days.
3.What payment methods are accepted for MAX6808US26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6808US26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6808US26?
MAX6808US26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6808US26 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 MAX6808US26?
For technical support, including MAX6808US26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6808US26 requirements.
6.How does Aetrix verify that MAX6808US26 is sourced from the original manufacturer or authorized distributors?
All MAX6808US26 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 MAX6808US26 meets industry standards.
7.What is the process for return or replacement of MAX6808US26?
All MAX6808US26 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6808US26, 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 MAX6808US26 part is unused and in its original packaging.
Return procedure for MAX6808US26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6808US26 Tags
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MIC826SYMT-TR
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