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Analog Devices Inc./Maxim Integrated MAX6808UR46
- Part No.:
- MAX6808UR46
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6808UR46.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,623
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Product details
Overview
MAX6808UR46 from Maxim Integrated is a precision 4.6V active-low open-drain voltage detector IC for microprocessor power monitoring. It asserts reset when VCC falls below 4.6V ±2%, provides stable switching via internal hysteresis, guarantees RESET validity down to VCC = 1.0V, draws only 35µA supply current, and is housed in a 3-pin SOT23 package - used in portable equipment, bar-code scanners, and critical µP systems requiring reliable brownout detection.
For engineers reviewing the MAX6808UR46 datasheet, MAX6808UR46 pinout, MAX6808UR46 application, or MAX6808UR46 equivalent, key selection considerations include its 4.6V threshold accuracy, open-drain output compatibility with multi-supply reset buses, immunity to VCC transients up to 100mV overdrive, guaranteed operation from 1.0V to 5.5V supply, and SOT23 footprint suitability for space-constrained embedded designs.
Technical Context
The MAX6808UR46 implements a precision bandgap-based voltage reference comparator with factory-trimmed 4.6V falling-threshold (VTH− = 4.60V ±2% at +25°C) and built-in hysteresis (VHYST = 0.02–0.03 × VTH−). Its open-drain RESET output requires an external pullup and sinks ≥20µA at VCC = 1.0V with VOL ≤ 0.3V, enabling wired-OR reset bus configurations.
It operates across −40°C to +85°C, supports VCC as low as 1.0V for valid reset assertion, exhibits <30ppm/°C reset threshold tempco, and rejects negative-going VCC transients ≤100µs wide depending on overdrive magnitude - critical for noisy battery-powered environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.60V ±2% (VTH−), ensuring reliable detection before 5V system ICs drop below minimum operating voltage |
| Supply Voltage Range | 1.0V to 5.5V, enabling use during deep brownout and full-system power-up sequencing |
| Supply Current | 35µA typical at VCC = 3.6V, minimizing impact on battery life in portable equipment |
| RESET Output Type | Active-low open-drain, allowing shared reset bus with multiple supplies (e.g., 3.3V & 5V domains) |
| Hysteresis | 0.02–0.03 × VTH−, preventing output chatter near threshold during slow-rising/falling VCC |
| Output Validity | RESET guaranteed low for VCC ≥ 1.0V, supporting reset assertion even under severe undervoltage |
| Tempco | ≤30ppm/°C, maintaining threshold stability across industrial temperature range |
Pinout & Package
MAX6808UR46 is supplied in a 3-pin SOT23 package (package code U3-1), with 1.3mm × 0.8mm footprint, 0.95mm height, and RoHS-compliant lead finish. Tape-and-reel delivery requires minimum 2500 units.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset output; must be pulled up externally to any supply ≤6V; sinks current when VCC < 4.6V |
| 2 | GND | Ground reference for internal comparator and output stage; connects to system ground plane |
| 3 | VCC | Power supply input; monitors this rail for undervoltage; functional from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| ±2% accurate 4.6V threshold | Guarantees reset assertion before 5V ±5% supplies fall outside regulation, protecting downstream logic |
| Open-drain RESET output | Enables direct connection to multi-voltage reset buses (e.g., 3.3V/5V) without level-shifting components |
| 1.0V minimum VCC operation | Ensures reset remains asserted through deep brownout, preventing partial system initialization |
| 35µA quiescent current | Extends battery runtime in portable scanners and handheld instruments without compromising supervision |
| Immunity to VCC transients | Rejects negative spikes ≤100µs wide (depending on overdrive), eliminating false resets in electrically noisy environments |
Applications
| Portable/Battery-Powered Equipment | Bar-Code Scanners |
|---|---|
Use Scenario: Handheld scanner powered by single-cell Li-ion (3.0–4.2V) with 5V boost converter supplying logic and laser driver. IC Role / Device Role / Timing Role: Monitors boosted 5V rail; asserts open-drain RESET to halt MCU and peripherals during undervoltage events. Use Value: Prevents corrupted firmware execution or laser misfire when boost converter fails or battery sags below safe operating voltage. |
Use Scenario: Industrial barcode reader with dual-supply design (3.3V logic, 5V imager), sharing a common reset line. IC Role / Device Role / Timing Role: Provides 4.6V reset supervision on 5V rail while interfacing via open-drain to 3.3V-compatible reset bus. Use Value: Eliminates need for discrete level translators; ensures synchronized reset across both voltage domains during power loss. |
| Critical µP and µC Power Monitoring | Intelligent Instruments |
Use Scenario: Medical diagnostic instrument with ARM Cortex-M4 MCU requiring deterministic reset during AC/DC adapter brownout. IC Role / Device Role / Timing Role: Detects 5V supply collapse below 4.6V; drives reset line low within 30µs (VCC falling at 1mV/µs). Use Value: Guarantees clean, glitch-free reset initiation before MCU enters undefined state, meeting IEC 62304 safety requirements. |
Use Scenario: Portable multimeter with real-time clock, LCD, and analog front-end powered from regulated 3.3V and 5V rails. IC Role / Device Role / Timing Role: Supervises main 5V rail; open-drain output interfaces to system reset controller managing power sequencing. Use Value: Enables coordinated shutdown of analog and digital subsystems, preserving calibration data and preventing EEPROM corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6806UR46-T | Same 4.6V threshold and SOT23 package, but features active-low push-pull RESET output instead of open-drain | Requires dedicated reset net; cannot share bus with other open-drain or mixed-voltage devices | Select when driving a single-load reset input without bus contention or level translation needs |
| TLV803EB26DBZR | 2.6V threshold, SOT23-3, open-drain, ±2% accuracy, but higher 60µA supply current and 1.6V min VCC | Not suitable for 4.6V 5V-system supervision; limited to lower-voltage domains like 3.3V or 2.5V logic | Choose only if redesigning for lower threshold and accepting reduced brownout coverage and higher current draw |
Compared with MAX6806UR46-T, MAX6808UR46 offers bus-sharing capability at identical accuracy and low-VCC operation; versus TLV803EB26DBZR, it delivers correct 4.6V threshold, lower ICC, and deeper undervoltage coverage - making it the sole fit for legacy 5V µP systems needing open-drain reset arbitration.
Availability
MAX6808UR46 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, bar-code scanners, critical µP and µC power monitoring, intelligent instruments, and computers requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX6808UR46 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 portable applications.
The MAX6806/MAX6807/MAX6808 family delivers highly accurate, low-power voltage supervision for microprocessor systems - engineered specifically to replace discrete resistor-divider + comparator solutions in space- and cost-sensitive 5V, 3V, and 2.5V platforms.
FAQ
What is the exact reset threshold voltage of the MAX6808UR46?
The MAX6808UR46 has a factory-trimmed nominal reset threshold of 4.60V with ±2% accuracy over temperature (4.508V to 4.692V at +25°C). This value applies specifically to the falling edge of VCC (VTH−) and is guaranteed across the full −40°C to +85°C operating range, ensuring consistent brownout detection in 5V systems.
Does the MAX6808UR46 require an external pullup resistor on the RESET pin?
Yes, the MAX6808UR46 features an active-low open-drain RESET output and requires an external pullup resistor. A 100kΩ resistor to any supply ≤6V is sufficient for high-impedance loads; lower values may be needed if driving capacitive or leakage-prone nodes. The pullup defines the logic-high level and enables wired-OR reset bus configurations.
Can the MAX6808UR46 operate reliably when VCC drops below 1.5V?
Yes - the MAX6808UR46 guarantees RESET remains a valid logic low for VCC ≥ 1.0V, with VOL ≤ 0.3V at ISINK = 20µA and VCC = 1.0V. Below 1.0V, the output becomes high-impedance; for continuous validity to ground, add a 100kΩ pulldown resistor to RESET as shown in Maxim's Figure 4.
Is the MAX6808UR46 pin-compatible with the MAX6806UR46-T or MAX6807UR46-T?
Yes - all three variants (MAX6806UR46-T, MAX6807UR46-T, MAX6808UR46-T) share identical 3-pin SOT23 pinout: Pin 1 = RESET/RESET, Pin 2 = GND, Pin 3 = VCC. However, their RESET output types differ (push-pull active-low, push-pull active-high, open-drain active-low), so PCB layout is compatible but system-level interface logic must match the selected variant.
What is the maximum transient immunity of the MAX6808UR46 against negative-going VCC spikes?
The MAX6808UR46 rejects negative-going VCC transients based on overdrive magnitude: for a 100mV overdrive (VTH− − VCC = 100mV), it tolerates spikes up to ~100µs wide without asserting reset. Immunity decreases as overdrive increases - e.g., 200mV overdrive limits spike width to ~25µs. A 0.1µF ceramic capacitor placed close to the VCC pin enhances transient rejection.
MAX6808UR46 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:
- 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-23-3
MAX6808UR46 FAQ
1.How can I place an order for MAX6808UR46 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6808UR46 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 MAX6808UR46 reliable?
The price and inventory of MAX6808UR46 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6808UR46 is usually 5 days.
3.What payment methods are accepted for MAX6808UR46?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6808UR46 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6808UR46?
MAX6808UR46 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6808UR46 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 MAX6808UR46?
For technical support, including MAX6808UR46 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6808UR46 requirements.
6.How does Aetrix verify that MAX6808UR46 is sourced from the original manufacturer or authorized distributors?
All MAX6808UR46 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 MAX6808UR46 meets industry standards.
7.What is the process for return or replacement of MAX6808UR46?
All MAX6808UR46 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6808UR46, 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 MAX6808UR46 part is unused and in its original packaging.
Return procedure for MAX6808UR46:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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