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Analog Devices Inc./Maxim Integrated MAX6808UR46+T
- Part No.:
- MAX6808UR46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6808UR46+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:232
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Product details
Overview
MAX6808UR46+T from Maxim Integrated is a precision voltage detector IC designed for power-supply monitoring in microprocessor-based systems. It features a factory-preset 4.6V ±2% reset threshold, active-low open-drain RESET output, operates down to VCC = 1.0V, draws only 35µA supply current, and is housed in a 3-pin SOT23 package - enabling reliable brownout detection in battery-powered bar-code scanners and portable instrumentation.
For engineers reviewing the MAX6808UR46+T datasheet, MAX6808UR46+T pinout, MAX6808UR46+T application, or MAX6808UR46+T equivalent, key selection criteria include its open-drain output architecture for bidirectional µP reset pin interfacing, guaranteed reset assertion at VCC ≥ 1.0V, ±2% threshold accuracy over -40°C to +85°C, and immunity to sub-100µs negative-going VCC transients.
Technical Context
The MAX6808UR46+T implements a comparator-based voltage detection circuit with internal hysteresis (VHYST = 0.02–0.03 × VTH−), generating two distinct trip points (VTH+ for rising VCC, VTH− for falling VCC) to prevent output chatter near threshold. Its open-drain RESET output requires an external pullup resistor and supports level-shifting up to 6V, enabling use across mixed-voltage domains.
Unlike push-pull variants (MAX6806/MAX6807), the MAX6808UR46+T avoids contention on bidirectional reset I/O pins (e.g., Motorola 68HC11), and its 35µA quiescent current and operation down to 1.0V VCC support ultra-low-power wake-up supervision in critical µP systems during deep sleep or battery-depletion scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.60V ±2% (VTH− at +25°C); ensures reset assertion before 5V system ICs drop below minimum operating voltage (e.g., 4.5V for 5V ±5% supply) |
| Supply Voltage Range | 1.0V to 5.5V (−40°C to +85°C); enables valid reset signaling even during severe brownout or battery sag |
| Supply Current | 35µA typical at VCC = 3.6V; minimizes standby power impact in portable equipment |
| RESET Output Type | Active-low open-drain; allows wired-OR configuration, level translation, and safe interfacing with bidirectional µP reset pins |
| Hysteresis | 0.02–0.03 × VTH−; prevents oscillation during slow-rising/falling VCC transitions near 4.6V |
| Reset Delay | 30µs (VCC falling at 1mV/µs); provides deterministic timing margin for power-down sequencing |
| Operating Temperature | −40°C to +85°C; qualified for industrial and embedded controller environments |
Pinout & Package
MAX6808UR46+T is supplied in a 3-pin SOT23 package (package code U3-1), with 1.3mm × 2.9mm footprint, 0.95mm height, and RoHS-compliant lead finish. Pin 1 is RESET (active-low open-drain), Pin 2 is GND, and Pin 3 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low open-drain output | Sinks current when VCC < 4.6V; requires external pullup to define logic-high level (e.g., 3.3V or 5V rail) |
| 2 (GND) | Ground reference | Return path for internal bias and RESET sink current; must be low-impedance connection to system ground plane |
| 3 (VCC) | Supply voltage input | Monitored power rail; accepts 1.0V–5.5V; internal circuitry remains functional down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| ±2% accurate reset threshold | Guarantees reset assertion within 4.508V–4.692V at +25°C, eliminating need for external trimming or calibration in 5V systems |
| Open-drain RESET output | Enables direct interface to µPs with bidirectional reset I/O (e.g., 68HC11) without contention or level-shifting circuitry |
| Valid RESET down to VCC = 1.0V | Ensures supervisory function remains active through deep brownout, supporting fail-safe shutdown in battery-powered devices |
| 35µA supply current | Reduces standby power consumption by >90% versus discrete resistor-zener solutions, extending battery life in portable instruments |
| Immunity to short VCC transients | Rejects negative-going transients ≤100µs at 50mV overdrive, improving robustness in electrically noisy environments like bar-code scanners |
Applications
| Bar-Code Scanners | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Handheld scanner experiences rapid battery voltage sag during laser activation or wireless transmission. IC Role / Device Role / Timing Role: Voltage detector monitoring main 3.3V/5V rail; asserts open-drain RESET to halt processor and peripherals before undervoltage lockout. Use Value: Prevents corrupted memory writes or erratic motor control by ensuring clean reset initiation at precisely 4.6V, independent of battery chemistry or aging. | Use Scenario: Medical handheld instrument enters low-power sleep mode with VCC dropping toward 1.2V. IC Role / Device Role / Timing Role: Supervisory IC providing wake-up reset signal as VCC rises past 4.6V; open-drain output interfaces directly to µP's bidirectional reset pin. Use Value: Eliminates need for external level shifter or pullup network, reducing BOM count and PCB area while maintaining reset validity down to 1.0V VCC. |
| Critical µP and µC Systems | Intelligent Instruments |
Use Scenario: Industrial controller experiences momentary AC line dip causing 5V rail to dip below 4.5V. IC Role / Device Role / Timing Role: Precision reset supervisor asserting active-low signal to reset microcontroller and peripheral ASICs synchronously. Use Value: ±2% threshold tolerance ensures reset occurs before downstream logic violates minimum VCC spec (e.g., 4.5V for 5V ±10% ICs), preventing metastability. | Use Scenario: Lab-grade multimeter powers up from cold start with unregulated linear supply. IC Role / Device Role / Timing Role: Power-on reset generator with 30µs delay, ensuring ADC reference and analog front-end stabilize before µC initialization. Use Value: Internal hysteresis (VHYST ≈ 92mV) prevents false resets during slow-rising VCC, guaranteeing single, clean reset pulse per power cycle. |
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 | Active-low push-pull RESET output; no external pullup required; RESET valid to VCC = 1.0V | Preferred where board space prohibits pullup resistor or where driving high-capacitance reset lines directly is needed | Select MAX6806UR46+T when interfacing to unidirectional reset inputs and minimizing external components is critical |
| TLV803EB46DBZR | 4.6V ±1% threshold; 300nA max IQ; SOT23-3 package; active-low open-drain; VCC range 0.8V–6V | Better suited for ultra-low-power IoT sensors where 35µA vs. 300nA impacts battery lifetime significantly | Choose TLV803EB46DBZR for energy-harvesting or multi-year battery applications requiring nanoamp quiescent current |
Compared with MAX6806UR46+T, the MAX6808UR46+T trades push-pull drive strength for flexible level-shifting and bidirectional compatibility; versus TLV803EB46DBZR, it offers higher noise immunity and proven transient rejection but consumes ~100× more supply current - making it optimal for industrial portable gear where reliability outweighs extreme ultra-low-power needs.
Availability
MAX6808UR46+T is available at Aetrix Electronics and suitable for bar-code scanners, portable/battery-powered equipment, critical µP and µC systems, and intelligent instruments requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6808UR46+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, computing, communications, and consumer applications.
The MAX6806/MAX6807/MAX6808 family was designed specifically for precision power-supply monitoring in digital systems - delivering factory-trimmed voltage thresholds, minimal external component count, and robust operation across industrial temperature ranges.
FAQ
What is the exact reset threshold voltage of the MAX6808UR46+T and how tightly is it specified?
The MAX6808UR46+T has a nominal reset threshold voltage (VTH−) of 4.60V, specified with ±2% accuracy over temperature (4.508V to 4.692V at +25°C). This tolerance is guaranteed across the full −40°C to +85°C operating range, ensuring consistent brownout detection in 5V systems without external calibration.
Why does the MAX6808UR46+T use an open-drain RESET output instead of push-pull?
The MAX6808UR46+T 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 networks and level translation - for example, pulling RESET to a 3.3V rail while monitoring a 5V VCC - which a push-pull output cannot support.
Can the MAX6808UR46+T operate reliably when the supply voltage drops below 1.2V?
Yes - the MAX6808UR46+T guarantees valid RESET output down to VCC = 1.0V, unlike the MAX6807 (guaranteed only to 1.2V). Below 1.0V, the internal circuitry ceases sinking current and RESET becomes high-impedance; for operation to ground, a 100kΩ pulldown resistor is recommended per the datasheet Figure 4.
What package type and pin configuration does the MAX6808UR46+T use?
The MAX6808UR46+T is packaged in a 3-pin SOT23 (U3-1) case with top mark "FZDU". Pin 1 is the active-low open-drain RESET output, Pin 2 is GND, and Pin 3 is VCC - matching the standard SOT23 pinout defined in Maxim's land pattern 90-0179.
How does the MAX6808UR46+T handle power-supply transients, and what is its immunity specification?
The MAX6808UR46+T is immune to short-duration negative-going VCC transients: it will not falsely assert reset for pulses ≤100µs when the overdrive (VTH− − VCC) is 50mV, and ≤20µs at 200mV overdrive (per Figure 3). Adding a 0.1µF ceramic capacitor close to the VCC pin further enhances transient immunity in noisy environments like bar-code scanners.
MAX6808UR46+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX6808UR46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6808UR46+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 MAX6808UR46+T reliable?
The price and inventory of MAX6808UR46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6808UR46+T is usually 5 days.
3.What payment methods are accepted for MAX6808UR46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6808UR46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6808UR46+T?
MAX6808UR46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6808UR46+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 MAX6808UR46+T?
For technical support, including MAX6808UR46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6808UR46+T requirements.
6.How does Aetrix verify that MAX6808UR46+T is sourced from the original manufacturer or authorized distributors?
All MAX6808UR46+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 MAX6808UR46+T meets industry standards.
7.What is the process for return or replacement of MAX6808UR46+T?
All MAX6808UR46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6808UR46+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 MAX6808UR46+T part is unused and in its original packaging.
Return procedure for MAX6808UR46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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