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Analog Devices Inc./Maxim Integrated MAX6808US32-T
- Part No.:
- MAX6808US32-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6808US32-T.pdf
- Description:
- MAX6808 VOLTAGE DETECTOR
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6808US32-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. Used in portable equipment and intelligent instruments where reliable brownout detection and manual reset capability are required.
For engineers reviewing the MAX6808US32-T datasheet, MAX6808US32-T pinout, MAX6808US32-T application, or MAX6808US32-T equivalent, key selection criteria include reset threshold accuracy, open-drain output compatibility with bidirectional µP reset pins, manual reset support via SOT143 package, and low 35µA supply current across -40°C to +85°C.
Technical Context
The MAX6808US32-T implements a precision bandgap-based voltage comparator with internal hysteresis (VHYST = 0.02–0.03 × VTH−) to prevent output chatter near 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 asserts RESET when VCC falls below 3.2V or MR is driven high, and guarantees valid logic-low output for VCC ≥ 1.0V.
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 |
| Supply Current | 35µA typical at VCC = 3.6V - enables ultra-low-power operation in battery-powered devices |
| RESET Output Type | Active-low, open-drain - allows wired-OR configuration and interface with bidirectional µP reset pins |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
| Hysteresis | 0.02–0.03 × VTH− - prevents oscillation during slow-rising/falling VCC transitions |
| Manual Reset Input | MR pin with 80kΩ internal pulldown - supports noise-immune, switch-driven reset without external components |
| Temperature Range | -40°C to +85°C - qualified for industrial and portable embedded applications |
Pinout & Package
MAX6808US32-T is supplied in a 4-pin SOT143 package with exposed pad (RoHS-compliant). This package includes dedicated MR input and supports tape-and-reel delivery (2500-piece minimum).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output - sinks current when asserted; requires external pullup resistor |
| 2 | GND | Ground reference - common return path for VCC, MR, and RESET |
| 3 | VCC | Supply voltage input - powers internal circuitry; operates from 1.0V to 5.5V |
| 4 | MR | Active-high manual reset input - asserts RESET when pulled above 0.7×VCC; internal 80kΩ pulldown |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.2V threshold | ±2% accuracy over temperature - eliminates need for external trimming or calibration in 3.3V system monitoring |
| Open-drain RESET output | Compatible with multi-voltage reset buses and bidirectional µP I/O - avoids contention on shared reset lines |
| Valid down to VCC = 1.0V | Ensures deterministic reset assertion during deep undervoltage - critical for orderly shutdown in portable gear |
| Integrated MR input | Eliminates external pullup/pulldown and debounce components - reduces BOM count and PCB area in SOT143 variant |
| Low 35µA quiescent current | Extends battery life in always-on monitoring applications - e.g., barcode scanners and handheld instruments |
Applications
| Portable/Battery-Powered Equipment | Intelligent Instruments |
|---|---|
Use Scenario: Power management in handheld barcode scanners with intermittent battery discharge cycles. IC Role / Device Role / Timing Role: Voltage detector providing brownout-triggered reset to prevent corrupted memory writes during low-VCC events. Use Value: Prevents data corruption by asserting RESET before VCC drops below 3.2V, with guaranteed operation down to 1.0V. | Use Scenario: Calibration and fault recovery in portable multimeters with microcontroller-based measurement engines. IC Role / Device Role / Timing Role: System supervisor ensuring clean restart after power interruption or user-initiated reset via front-panel button. Use Value: MR pin enables direct hardware reset without firmware involvement; open-drain output interfaces cleanly with µP's bidirectional reset I/O. |
| Critical µP and µC Power Monitoring | Computers |
Use Scenario: Real-time clock (RTC) and sensor subsystem supervision in industrial controllers with wide input voltage range. IC Role / Device Role / Timing Role: Precision reset generator maintaining system integrity during 3.3V rail instability caused by load transients. Use Value: ±2% threshold accuracy and 30µs delay ensure reset is asserted only when VCC truly violates specification - no false triggers. | Use Scenario: Embedded controller supervision in compact PC peripherals such as USB-to-serial adapters. IC Role / Device Role / Timing Role: Low-quiescent-current voltage monitor replacing discrete reset circuits to reduce footprint and cost. Use Value: 35µA ICC enables always-on monitoring without impacting host USB power budget; SOT143 fits tight layout constraints. |
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, but push-pull active-low output; no MR pin in SOT143 variant | Lacks manual reset capability; requires external pullup only if interfacing with open-drain bus | Select when MR is unnecessary and faster rise time (no external pullup) is preferred |
| TLV803EB32DBZR | 3.2V threshold, ±1% accuracy, 1.8–6V operation, no MR pin, SOT23-3 package | Smaller footprint but no manual reset; higher accuracy trades off against lack of MR and different package | Select for space-constrained designs where MR is handled elsewhere and tighter threshold tolerance is critical |
Compared with MAX6808US32-T, MAX6315US32D3-T offers push-pull drive but omits MR, while TLV803EB32DBZR delivers superior accuracy in a smaller package but removes manual reset entirely - making MAX6808US32-T uniquely suited for applications requiring both precision threshold and hardware-initiated reset in compact industrial formats.
Availability
MAX6808US32-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instruments, critical µP and µC power monitoring, and computers requiring stable component supply and long-term industrial availability.
Supply support for MAX6808US32-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 analog, mixed-signal, and power-management ICs for industrial, computing, and portable applications.
The MAX680x series was designed specifically for low-power, high-accuracy power-supply monitoring in microprocessor systems - emphasizing threshold stability, minimal external components, and flexible reset output configurations.
FAQ
What is the exact reset threshold voltage of the MAX6808US32-T?
The MAX6808US32-T has a factory-trimmed nominal reset threshold of 3.20V with ±2% accuracy over temperature (–40°C to +85°C). Electrical characteristics specify VTH− = 3.136V (min) to 3.264V (max) at +25°C, and hysteresis is 0.02–0.03 × VTH−. This makes MAX6808US32-T ideal for monitoring 3.3V rails where precise brownout detection is required.
Why does the MAX6808US32-T use an open-drain RESET output instead of push-pull?
The MAX6808US32-T uses an open-drain RESET output to enable wired-OR connection with other reset sources and safe interfacing with microprocessors that have bidirectional reset I/O pins (e.g., Motorola 68HC11). This avoids bus contention and allows pullup to any compatible voltage up to 6V. Unlike push-pull variants (MAX6806/MAX6807), MAX6808US32-T requires an external pullup resistor - a deliberate design choice for system-level flexibility.
Does the MAX6808US32-T support manual reset, and how is it implemented?
Yes, the MAX6808US32-T supports manual reset via its MR pin, available only in the 4-pin SOT143 package. MR is an active-high input with an internal 80kΩ pulldown resistor, allowing direct connection of a momentary switch to VCC. When MR is pulled above 0.7×VCC, RESET is asserted immediately - independent of VCC level. This feature is confirmed in the Pin Description and Applications Information sections of the official datasheet.
What is the minimum operating supply voltage for the MAX6808US32-T to guarantee RESET assertion?
The MAX6808US32-T guarantees valid RESET assertion down to VCC = 1.0V. Below this, the internal circuitry ceases to sink current and RESET becomes high-impedance. This specification is explicitly stated in the General Description and Electrical Characteristics tables, confirming MAX6808US32-T's suitability for deep-brownout detection in battery-powered systems where supply collapse must be captured early.
How does the MAX6808US32-T handle power-supply transients, and what protection is recommended?
The MAX6808US32-T is immune to short-duration negative-going VCC transients - it will not falsely assert RESET for pulses under specific overdrive/duration limits (e.g., <100µs for 100mV overdrive). To enhance immunity, Maxim recommends placing a 0.1µF capacitor as close as possible to the VCC pin. This decoupling strategy is validated in the Applications Information section and ensures robust operation in noisy environments like portable instrumentation.
MAX6808US32-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
MAX6808US32-T FAQ
1.How can I place an order for MAX6808US32-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6808US32-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 MAX6808US32-T reliable?
The price and inventory of MAX6808US32-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6808US32-T is usually 5 days.
3.What payment methods are accepted for MAX6808US32-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6808US32-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6808US32-T?
MAX6808US32-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6808US32-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 MAX6808US32-T?
For technical support, including MAX6808US32-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6808US32-T requirements.
6.How does Aetrix verify that MAX6808US32-T is sourced from the original manufacturer or authorized distributors?
All MAX6808US32-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 MAX6808US32-T meets industry standards.
7.What is the process for return or replacement of MAX6808US32-T?
All MAX6808US32-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6808US32-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 MAX6808US32-T part is unused and in its original packaging.
Return procedure for MAX6808US32-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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