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Analog Devices Inc./Maxim Integrated MAX6865UK46D2S+T
- Part No.:
- MAX6865UK46D2S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK46D2S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,471
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Product details
Overview
MAX6865UK46D2S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.625V reset threshold (±2.5%), 40ms minimum reset timeout, and integrated watchdog timer with 3.3s typical timeout. It monitors VCC, responds to manual reset (MR), and asserts active-high push-pull RESET during brownout or watchdog expiration - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK46D2S+T datasheet, MAX6865UK46D2S+T pinout, MAX6865UK46D2S+T application, or MAX6865UK46D2S+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, MR glitch rejection of 200ns, and compatibility with 1.2V–5.5V supply rails in space-constrained portable systems.
Technical Context
The MAX6865UK46D2S+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and a digital watchdog timer that clears on any WDI edge (rising or falling) and expires if WDI remains static beyond 3.3s (typ). Its internal 10kΩ MR pullup enables direct switch interfacing without external components.
RESET assertion is triggered by VCC falling below 4.625V, MR low pulse ≥1µs, or WDI timeout; deassertion occurs only after VCC exceeds threshold *and* the 40ms timeout elapses. The push-pull active-high output drives directly to VCC, eliminating need for external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V - enables >10-year battery life in coin-cell–powered devices |
| Reset Threshold | 4.625V ±2.5% - factory-trimmed for precise brownout detection at 5V rail margin |
| Reset Timeout | 40ms min (D2 option) - ensures µP initialization completes before release from reset |
| Watchdog Timeout | 3.3s typ (S suffix) - balances fault coverage and software execution overhead in embedded firmware |
| VCC Operating Range | 1.2V to 5.5V - supports operation across Li-ion, alkaline, and regulated 3.3V/5V domains |
| RESET Validity Limit | Guaranteed to VCC = +1.1V - maintains deterministic reset state during deep brownout |
| MR Glitch Rejection | 200ns - suppresses EMI-induced false resets in noisy portable environments |
Pinout & Package
Package: 5-pin SOT23 (lead-free, +T suffix), 2.9mm × 1.6mm footprint, 1.1mm height - compatible with standard high-volume pick-and-place assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; drives high to VCC when asserted, sinks no current when deasserted |
| 2 | GND | Ground reference for all internal circuitry and reset timing; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 4 | WDI | Watchdog input; edge-sensitive (150ns min pulse); clears internal timer on rising/falling transition |
| 5 | VCC | Supply and monitored voltage rail; requires 0.1µF ceramic bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables multi-year operation on CR2032 coin cells |
| No external components | Integrated MR pullup, precision voltage reference, and watchdog oscillator eliminate BOM cost and layout area |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in electrically noisy handhelds |
| Guaranteed RESET down to 1.1V | Ensures deterministic reset behavior during deep undervoltage conditions common in battery discharge |
| Watchdog edge-triggered clear | WDI toggling (not level-hold) resets timer - simplifies firmware integration and avoids stuck-loop false negatives |
Applications
| Glucose Monitor | Patient Vital Sign Recorder |
|---|---|
Use Scenario: Portable, single-use glucose meter powered by CR2032 battery with firmware-driven self-test sequence. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output, triggers hardware reset if firmware hangs during ADC calibration or Bluetooth handshake. Use Value: 170nA ICC extends shelf life and field runtime; 4.625V threshold guards against LDO dropout during peak current draw. |
Use Scenario: Wearable ECG patch recording heart rate and SpO₂ continuously for 72 hours on a 120mAh LiPo cell. IC Role / Device Role / Timing Role: Monitors main 3.0V supply and asserts RESET if VCC drops below safe operating voltage or if MCU fails to service WDI within 3.3s. Use Value: Guaranteed RESET validity to 1.1V prevents undefined MCU state during battery exhaustion; 40ms timeout allows full RAM retention restore. |
| Industrial Handheld Scanner | Smart Hearing Aid |
Use Scenario: Rugged barcode scanner with cold-temperature operation (-20°C) and frequent wake/sleep cycles. IC Role / Device Role / Timing Role: Provides power-on reset and watchdog supervision for ARM Cortex-M0 host; MR pin connected to mechanical reset button. Use Value: MR glitch rejection (200ns) eliminates false resets from switch bounce; -40°C to +85°C rating ensures reliability in warehouse environments. |
Use Scenario: Rechargeable hearing aid using ultra-low-power DSP and Bluetooth LE, requiring <5µA average system current. IC Role / Device Role / Timing Role: Supervises 1.8V buck converter output and services WDI from DSP's periodic status register read. Use Value: 170nA ICC contributes <0.5% to total system quiescent current; SOT23-5 footprint fits tight 8mm × 6mm PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | Fixed 3.3V reset threshold; no watchdog; 200ms reset timeout; 1.6µA ICC | Suitable only for fixed 3.3V systems without code-execution monitoring | Select when watchdog functionality is unnecessary and higher ICC is acceptable for simpler design |
| STM6315SW33DX | 3.3V threshold; 200ms timeout; 1.5µA ICC; no WDI; open-drain RESET | Lacks watchdog and MR input; requires external pullup; not suitable for active-high interface | Choose only for legacy 3.3V designs where pin count and feature set match existing layout |
Compared with TPS3837K33DBVR and STM6315SW33DX, the MAX6865UK46D2S+T uniquely delivers 4.625V precision threshold, 3.3s watchdog, and 170nA ICC in the same SOT23-5 footprint - enabling next-gen portable medical devices to meet stringent battery life and functional safety requirements without layout change.
Availability
MAX6865UK46D2S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered industrial scanners, and wearable health monitors requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6865UK46D2S+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) designs precision analog and mixed-signal ICs for power, sensing, and connectivity in demanding industrial, medical, and automotive applications.
The MAX68xx family targets ultra-low-power microprocessor supervision in space- and energy-constrained portable electronics, emphasizing nanopower operation, robust reset timing, and integrated watchdog functionality without external components.
FAQ
What is the exact reset threshold voltage of MAX6865UK46D2S+T?
The MAX6865UK46D2S+T has a factory-trimmed reset threshold of +4.625V, with tolerance of ±2.5% over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "46" corresponds to 4.625V nominal. The device guarantees valid RESET assertion down to VCC = +1.1V, making MAX6865UK46D2S+T suitable for brownout protection in 5V systems with tight regulation margins.
Does MAX6865UK46D2S+T support active-high or active-low reset output?
MAX6865UK46D2S+T provides an active-high push-pull RESET output - it drives high to VCC when reset is asserted and floats high-impedance when deasserted. This is confirmed in the MAX6865 pin description (page 8) and Selector Guide (page 16), where MAX6865 is marked under "Push-Pull ACTIVE HIGH". Unlike open-drain variants, MAX6865UK46D2S+T requires no external pullup resistor, simplifying interface to µPs with active-high reset inputs.
What is the watchdog timeout period for MAX6865UK46D2S+T?
The MAX6865UK46D2S+T features a watchdog timeout period of 3.3s (typical), corresponding to the "S" suffix in its part number. Per Table 3 (Watchdog Timeout), "S" denotes min/typ/max values of 1.5s / 3.3s / 7.75s. The timer clears on any WDI edge (rising or falling) and expires only if WDI remains static beyond this interval - a critical feature for detecting firmware lockup in MAX6865UK46D2S+T-based medical devices.
Can MAX6865UK46D2S+T operate from a 1.8V supply?
Yes, MAX6865UK46D2S+T operates across VCC = 1.2V to 5.5V, with specified performance including 170nA typical supply current at 1.8V (Electrical Characteristics table, page 2). Its RESET output remains valid down to VCC = +1.1V, and MR input thresholds scale with VCC (VIH = 0.7×VCC, VIL = 0.3×VCC). This makes MAX6865UK46D2S+T fully compatible with 1.8V logic domains and low-voltage battery systems.
Is MAX6865UK46D2S+T pin-compatible with other MAX68xx devices?
MAX6865UK46D2S+T uses the standard 5-pin SOT23 package and shares identical pinout with MAX6864/MAX6866/MAX6867–MAX6869 (pin 1 = RESET, pin 2 = GND, pin 3 = MR, pin 4 = WDI, pin 5 = VCC). However, it is *not* pin-compatible with MAX6854/MAX6855/MAX6856 (which lack WDI) or MAX6861–MAX6863 (which use CT instead of WDI). Always verify function mapping per the Selector Guide before substitution.
MAX6865UK46D2S+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK46D2S+T FAQ
1.How can I place an order for MAX6865UK46D2S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK46D2S+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 MAX6865UK46D2S+T reliable?
The price and inventory of MAX6865UK46D2S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK46D2S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK46D2S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK46D2S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK46D2S+T?
MAX6865UK46D2S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK46D2S+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 MAX6865UK46D2S+T?
For technical support, including MAX6865UK46D2S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK46D2S+T requirements.
6.How does Aetrix verify that MAX6865UK46D2S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK46D2S+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 MAX6865UK46D2S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK46D2S+T?
All MAX6865UK46D2S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK46D2S+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 MAX6865UK46D2S+T part is unused and in its original packaging.
Return procedure for MAX6865UK46D2S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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