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Analog Devices Inc./Maxim Integrated MAX6808US46
- Part No.:
- MAX6808US46
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6808US46.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,808
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Product details
Overview
MAX6808US46 from Maxim Integrated is a precision 4.6V ±2% voltage detector IC with active-low open-drain RESET output, designed for power supply monitoring in microprocessor-based systems. It asserts reset when VCC falls below 4.508V (min) at +25°C, guarantees RESET validity down to VCC = 1.0V, draws only 35µA typical supply current, and features internal hysteresis for stable switching-used in portable equipment, bar-code scanners, and critical µP power monitoring.
For engineers reviewing the MAX6808US46 datasheet, MAX6808US46 pinout, MAX6808US46 application, or MAX6808US46 equivalent, this page delivers verified electrical specs, SOT143 package details, manual-reset integration guidance, and validated alternative options for 4.6V supervisor replacement in battery-powered and industrial embedded designs.
Technical Context
The MAX6808US46 implements a precision bandgap-based voltage reference comparator with factory-trimmed 4.6V threshold (±2% over -40°C to +85°C), 20mV typical hysteresis (VHYST = VTH+ − VTH−), and guaranteed operation from VCC = 1.0V to 5.5V. Its open-drain RESET output requires an external pullup and supports interfacing with bidirectional µP reset pins without contention.
It integrates a manual-reset input (MR) with 80kΩ internal pulldown resistor, enabling operator-initiated reset via momentary switch to VCC. MR threshold is defined as VIL ≤ 0.6V and VIH ≥ 0.7×VCC, and the device is immune to negative-going VCC transients up to 100µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.60V ±2% (4.508V–4.692V at +25°C); ensures reliable assertion before system ICs drop below minimum operating voltage. |
| Supply Voltage Range | 1.0V to 5.5V; enables valid reset assertion during deep brownout and full-system power-down sequencing. |
| Supply Current | 35µA typical at VCC = 3.6V; minimizes quiescent load in battery-powered applications. |
| RESET Output Type | Active-low open-drain; allows wired-OR configuration, level-shifting across supplies (up to 6V), and safe interface with bidirectional µP reset I/O. |
| Hysteresis | 20mV typical (0.02×VTH− to 0.03×VTH−); prevents output chatter near threshold during slow-rising/falling VCC. |
| MR Input Threshold | VIL ≤ 0.6V, VIH ≥ 0.7×VCC; compatible with standard logic families and enables robust manual reset with RC noise filtering. |
| Operating Temp | -40°C to +85°C; qualified for industrial and portable equipment environments without derating. |
Pinout & Package
MAX6808US46 is supplied in a 4-pin SOT143 package (lead-free, RoHS-compliant), with pin 1 = RESET (active-low open-drain), pin 2 = GND, pin 3 = VCC, and pin 4 = MR (active-high manual reset input). The MR pin includes an internal 80kΩ pulldown resistor, allowing unconnected use when manual reset is not required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low open-drain output | Sinks current when asserted; requires external pullup to define high state and support multi-supply or wired-OR reset networks. |
| 2 (GND) | Ground reference | Common return path for VCC, MR, and RESET; must be low-impedance to ensure accurate threshold sensing. |
| 3 (VCC) | Supply voltage input | Monitored rail; operates from 1.0V to 5.5V; absolute max rating is -0.3V to +6.0V. |
| 4 (MR) | Active-high manual reset input | Asserts RESET when pulled ≥0.7×VCC; internal 80kΩ pulldown enables NC default; supports noise immunity with 0.1µF capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.6V threshold | ±2% accuracy over full temperature range eliminates need for external calibration or trimming components. |
| Open-drain RESET with 1V min VCC support | Enables interoperability with mixed-voltage systems and guarantees deterministic reset state down to ultra-low supply levels. |
| Integrated manual reset (MR) input | Reduces BOM count by eliminating external pullup/pulldown and simplifies field service or test-mode reset implementation. |
| Immunity to VCC transients | Withstands negative-going transients up to 100µs at 100mV overdrive-no external filtering required for typical digital noise environments. |
| Low 35µA supply current | Extends battery life in portable equipment without sacrificing reset timing accuracy or threshold stability. |
Applications
| Portable/Battery-Powered Equipment | Bar-Code Scanners |
|---|---|
Use Scenario: Power management in handheld scanners powered by single-cell Li-ion or alkaline batteries, where VCC sags during motor activation or RF transmission. IC Role / Device Role / Timing Role: Voltage supervisor asserting reset when battery voltage drops below 4.6V, preventing corrupted firmware execution during brownout. Use Value: Prevents data loss and flash corruption by ensuring µP remains held in reset until stable 4.6V+ supply is restored-critical for field-deployed scanning devices. |
Use Scenario: Compact barcode reader with integrated laser diode and CMOS imager, requiring clean power-up sequencing and transient immunity. IC Role / Device Role / Timing Role: Reset generator with open-drain output interfaced to bidirectional µP reset pin, avoiding bus contention during power transitions. Use Value: Enables direct connection to Motorola 68HC11-style controllers without external logic, reducing PCB area and component count. |
| Critical µP and µC Power Monitoring | Intelligent Instruments |
Use Scenario: Industrial controller running real-time OS, where undervoltage can cause memory corruption or unsafe actuator states. IC Role / Device Role / Timing Role: Primary power-fail detector triggering hardware reset within 30µs of VCC falling below 4.508V, with hysteresis preventing chatter. Use Value: Guarantees deterministic system recovery after brownout, meeting IEC 61000-4-11 immunity requirements for sustained dips. |
Use Scenario: Portable multimeter or gas analyzer with LCD, sensor ADC, and wireless comms-all sharing a regulated 5V rail. IC Role / Device Role / Timing Role: Supervisor providing synchronized reset to all subsystems upon power-on or supply sag, with MR support for user-initiated recalibration. Use Value: Eliminates need for discrete RC reset circuits and ensures consistent boot behavior across temperature and battery aging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6808UR46-T | Same 4.6V threshold, ±2% accuracy, and open-drain RESET, but in 3-pin SOT23 package (no MR pin). | Lacks manual reset capability; suitable only where external reset control is unnecessary or implemented elsewhere. | Select when board space is constrained and MR functionality is not required-reduces footprint by ~30% vs. SOT143. |
| TPS3808G33DBVR | 3.3V fixed threshold (not 4.6V); push-pull active-low RESET; 1.8V–6.0V VCC range; 1.6µA quiescent current. | Designed for lower-voltage systems (e.g., 3.3V µPs); no MR pin; lacks transient immunity spec beyond 100mV overdrive. | Use only if system operates at 3.3V nominal and ultra-low IQ is prioritized over 4.6V threshold accuracy and MR support. |
Compared with MAX6808UR46-T, MAX6808US46 provides manual reset integration in a compact SOT143; compared with TPS3808G33DBVR, it delivers precise 4.6V detection with MR and proven transient immunity-making it optimal for 5V portable and industrial µP supervision where reliability and field serviceability are essential.
Availability
MAX6808US46 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, bar-code scanners, and critical µP power monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6808US46 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 consumer applications.
The MAX6806/MAX6807/MAX6808 family was designed specifically for precision power-supply monitoring in µP/µC systems-delivering factory-trimmed thresholds, minimal external components, and robust operation across wide temperature and supply ranges.
FAQ
What is the exact reset threshold voltage of MAX6808US46, and how does it vary with temperature?
The MAX6808US46 has a nominal reset threshold of 4.60V with ±2% accuracy over -40°C to +85°C, corresponding to 4.508V (min) to 4.692V (max) at +25°C. Its tempco is specified at 30ppm/°C, meaning threshold drift is ≤ ±12mV over the full temperature range-verified in Figure MAX6806/7/8-04 of the datasheet. This ensures reliable detection even under thermal stress in portable or industrial enclosures.
Does MAX6808US46 require an external pullup resistor on the RESET pin, and what value is recommended?
Yes, MAX6808US46 requires an external pullup resistor on the RESET pin because it features an open-drain output. A 100kΩ resistor is recommended for high-impedance loads (e.g., CMOS inputs), as stated in the Applications Information section. For heavier loads or faster rise times, values between 10kΩ and 47kΩ may be used-ensuring VOL ≤ 0.3V at ISINK = 20µA and VOH ≥ 0.7×VDD when pulled to the target logic rail.
Can MAX6808US46 assert a valid reset signal when VCC drops below 1.0V?
No-MAX6808US46 guarantees RESET validity only down to VCC = 1.0V. Below that, the output becomes high-impedance and cannot sink current. As noted in the Applications Information section, if reset must remain valid down to ground, a 100kΩ pulldown resistor should be added from RESET to GND to prevent floating states in ultra-low-power shutdown modes.
What is the function of the MR pin on MAX6808US46, and how should it be used?
The MR (Manual Reset) pin on MAX6808US46 is an active-high input that asserts RESET when pulled to ≥0.7×VCC. It includes an internal 80kΩ pulldown resistor, so it may be left unconnected if unused. For field reset, connect a normally open momentary switch between MR and VCC; for noise immunity in electrically noisy environments, add a 0.1µF capacitor from MR to GND-per Figure 4 in the datasheet.
Is MAX6808US46 pin-compatible with other packages in the MAX6806/MAX6807/MAX6808 family?
No-MAX6808US46 uses a 4-pin SOT143 package with dedicated MR pin, while MAX6808UR46-T (SOT23) and MAX6808XR46-T (SC70) have only three pins and omit MR functionality. Pin compatibility exists only within same-package variants (e.g., MAX6808UA46 and MAX6808SA46 both use 8-pin µMAX/SO footprints), but MAX6808US46's SOT143 layout is unique to the MR-enabled versions.
MAX6808US46 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
MAX6808US46 FAQ
1.How can I place an order for MAX6808US46 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6808US46 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 MAX6808US46 reliable?
The price and inventory of MAX6808US46 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6808US46 is usually 5 days.
3.What payment methods are accepted for MAX6808US46?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6808US46 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6808US46?
MAX6808US46 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6808US46 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 MAX6808US46?
For technical support, including MAX6808US46 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6808US46 requirements.
6.How does Aetrix verify that MAX6808US46 is sourced from the original manufacturer or authorized distributors?
All MAX6808US46 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 MAX6808US46 meets industry standards.
7.What is the process for return or replacement of MAX6808US46?
All MAX6808US46 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6808US46, 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 MAX6808US46 part is unused and in its original packaging.
Return procedure for MAX6808US46:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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