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Analog Devices Inc./Maxim Integrated MAX6808US32
- Part No.:
- MAX6808US32
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6808US32.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:650
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Product details
Overview
MAX6808US32 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. Used in portable equipment and critical µP power monitoring, it eliminates external components while providing stable reset assertion during brownout and power-down.
For engineers reviewing the MAX6808US32 datasheet, MAX6808US32 pinout, MAX6808US32 application, or MAX6808US32 equivalent, key selection criteria include its 3.2V threshold accuracy, open-drain output compatibility with bidirectional µP reset pins, manual-reset capability in SOT143, and immunity to negative-going VCC transients up to 100µs at 50mV overdrive.
Technical Context
The MAX6808US32 implements a precision bandgap-based voltage comparator with internal hysteresis (VHYST = 0.02–0.03 × VTH−), ensuring clean switching without chatter near the 3.2V threshold. Its open-drain RESET output requires an external pullup and supports interfacing with multiple supply domains up to 6V.
It integrates a manual-reset input (MR) with 80kΩ internal pulldown, enabling operator-initiated reset via momentary switch. The device operates across −40°C to +85°C and draws only 35µA typical supply current at VCC = 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.20V ±2% (VTH−), accurate enough to monitor 3.3V ±5% supplies before system ICs drop below minimum operating voltage |
| Supply Voltage Range | 1.0V to 5.5V - enables valid RESET assertion even during deep brownout down to 1V |
| Supply Current | 35µA typical at 3.6V - minimizes battery drain in portable equipment |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and safe interfacing with bidirectional µP reset I/O |
| Hysteresis | 0.02–0.03 × VTH− - prevents oscillation during slow-rising/falling VCC near threshold |
| MR Input Threshold | VIL ≤ 0.6V, VIH ≥ 0.7×VCC - ensures robust manual reset activation with standard logic levels |
| Operating Temperature | −40°C to +85°C - qualified for industrial and embedded computing environments |
Pinout & Package
MAX6808US32 is supplied in a 4-pin SOT143 package with exposed pad (RoHS-compliant). This thermally enhanced, surface-mount package supports manual reset functionality not available in 3-pin variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks current when VCC < 3.2V; requires external pullup to any supply ≤6V |
| 2 | GND | Ground reference for all internal circuitry and MR input |
| 3 | VCC | Power supply input; device monitors this rail and asserts RESET when falling below 3.2V |
| 4 | MR | Active-high manual reset input; internally pulled down by 80kΩ; asserts RESET when driven >0.7×VCC |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.2V threshold | ±2% accuracy eliminates need for external resistor dividers or calibration in 3.3V system monitoring |
| Open-drain RESET output | Enables direct interface with bidirectional µP reset pins (e.g., Motorola 68HC11) without contention |
| Manual reset input (MR) | Integrated 80kΩ pulldown allows switch-only implementation; no external bias required |
| Transient immunity | Immune to negative-going VCC transients ≤100µs at 50mV overdrive - reduces false resets in noisy power rails |
| Low supply current | 35µA typical at 3.6V extends battery life in handheld and IoT edge devices |
Applications
| Battery-Powered Portable Equipment | Industrial Microcontroller Supervision |
|---|---|
Use Scenario: Power monitoring in handheld barcode scanners and portable data loggers with single-cell Li-ion or alkaline supplies. IC Role / Device Role / Timing Role: Voltage detector asserting reset when battery voltage drops below 3.2V, preventing corrupted memory writes or undefined µP states. Use Value: Guarantees RESET remains valid down to VCC = 1.0V, enabling controlled shutdown before brownout-induced lockup. | Use Scenario: Reliable power-on and brownout detection in programmable logic controllers (PLCs) and sensor nodes deployed in factory environments. IC Role / Device Role / Timing Role: Primary supervisor IC generating clean, hysteresis-stabilized reset signal for ARM Cortex-M or PIC microcontrollers. Use Value: ±2% threshold accuracy ensures reset occurs within 3.3V supply tolerance (±5%), protecting firmware integrity during line fluctuations. |
| Intelligent Instrumentation | Critical µP Systems |
Use Scenario: Power integrity monitoring in handheld multimeters and portable oscilloscopes requiring deterministic startup and fault recovery. IC Role / Device Role / Timing Role: Precision voltage monitor with manual reset (MR) for technician-initiated recalibration or self-test sequences. Use Value: 4-pin SOT143 package provides MR functionality in minimal footprint, eliminating need for discrete pushbutton circuitry. | Use Scenario: Reset generation for safety-critical embedded controllers in medical diagnostic tools or test equipment. IC Role / Device Role / Timing Role: Fail-safe supervisor ensuring µP remains held in reset until VCC stabilizes above 3.2V with hysteresis margin. Use Value: Immunity to short-duration VCC transients prevents spurious resets during ESD events or switching noise on shared power rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR32-T | 3.08V threshold (±0.5%), 1.2µA max quiescent current, no MR pin, SC70-3 package | Lacks manual reset and open-drain flexibility; suited for ultra-low-power, space-constrained designs without MR need | Select when lowest possible current (<2µA) and smallest footprint are prioritized over MR and multi-rail reset flexibility |
| TLV803EB32DBZR | 3.2V threshold (±1%), 0.5µA max quiescent current, active-low open-drain, SOT23-3, no MR | No manual reset input; lower accuracy but superior current efficiency; lacks SOT143 MR option | Choose for cost-sensitive, low-current applications where MR is implemented externally or omitted |
Compared with MAX6808US32, MAX6326UR32-T offers tighter threshold tolerance and lower current but omits MR and open-drain configurability, while TLV803EB32DBZR delivers ultra-low power and smaller size at the expense of manual reset integration and thermal robustness in SOT143.
Availability
MAX6808US32 is available at Aetrix Electronics and suitable for battery-powered portable equipment, industrial microcontroller supervision, and intelligent instrumentation requiring stable component supply and long-term manufacturability.
Supply support for MAX6808US32 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 industrial, computing, and communications applications.
The MAX680x series targets cost-sensitive, high-reliability power-monitoring needs in µP/µC systems, emphasizing accuracy, low power, and flexible reset output configurations across multiple packages.
FAQ
What is the exact reset threshold voltage of MAX6808US32 and how is it specified?
The MAX6808US32 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 specified as VTH− (falling VCC threshold) and includes internal hysteresis to prevent chatter. The threshold remains stable across temperature with a tempco of 30ppm/°C, making it suitable for monitoring 3.3V ±5% power rails in industrial environments.
Why does MAX6808US32 use an open-drain RESET output instead of push-pull?
The MAX6808US32 uses an active-low open-drain RESET output to safely interface with microprocessors that have bidirectional reset I/O pins-such as the Motorola 68HC11-where push-pull outputs could cause bus contention. It also allows wired-OR connection of multiple reset sources and supports level-shifting across different supply domains (up to 6V) using a single external pullup resistor, enhancing system-level design flexibility.
Does MAX6808US32 support manual reset, and how is it implemented?
Yes, MAX6808US32 supports manual reset via the MR pin in its 4-pin SOT143 package. MR is an active-high input with an internal 80kΩ pulldown resistor, allowing direct connection of a normally open momentary switch between MR and VCC. No external components are needed. When MR is driven above 0.7×VCC, RESET is asserted regardless of VCC level-enabling technician-initiated reset for calibration or recovery without power cycling.
What is the minimum VCC required for MAX6808US32 to guarantee a valid RESET output?
MAX6808US32 guarantees a valid active-low RESET output down to VCC = 1.0V. Below 1.0V, the output becomes high-impedance (open circuit). For applications requiring RESET to remain low all the way to ground, a 100kΩ pulldown resistor on the RESET line is recommended. This behavior is explicitly characterized and guaranteed in the datasheet's Electrical Characteristics table under "RESET Output Voltage (MAX6808)".
How does MAX6808US32 handle power-supply transients, and what protection does it offer?
MAX6808US32 is immune to short-duration negative-going VCC transients-up to 100µs wide at 50mV overdrive (i.e., VCC dropping 50mV below the 3.2V threshold). This immunity prevents false resets caused by switching noise or ESD-induced dips. A 0.1µF capacitor placed close to the VCC pin further enhances transient rejection. The device's internal architecture filters such events without requiring external RC networks or watchdog timers.
MAX6808US32 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
MAX6808US32 FAQ
1.How can I place an order for MAX6808US32 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6808US32 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 MAX6808US32 reliable?
The price and inventory of MAX6808US32 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6808US32 is usually 5 days.
3.What payment methods are accepted for MAX6808US32?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6808US32 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6808US32?
MAX6808US32 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6808US32 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 MAX6808US32?
For technical support, including MAX6808US32 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6808US32 requirements.
6.How does Aetrix verify that MAX6808US32 is sourced from the original manufacturer or authorized distributors?
All MAX6808US32 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 MAX6808US32 meets industry standards.
7.What is the process for return or replacement of MAX6808US32?
All MAX6808US32 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6808US32, 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 MAX6808US32 part is unused and in its original packaging.
Return procedure for MAX6808US32:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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