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Analog Devices Inc./Maxim Integrated MAX6865UK19D1S+T
- Part No.:
- MAX6865UK19D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK19D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,932
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Product details
Overview
The MAX6865UK19D1S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 1.9V reset threshold (suffix '19'), 10ms minimum reset timeout (suffix 'D1'), and watchdog timer with 3.3s typical timeout (suffix 'S'). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout - designed for reliable power-up/brownout protection in battery-powered medical and portable electronics.
For engineers reviewing the MAX6865UK19D1S+T datasheet, MAX6865UK19D1S+T pinout, MAX6865UK19D1S+T application, or MAX6865UK19D1S+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Maxim's official specifications for the precise part number.
Technical Context
The MAX6865UK19D1S+T integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. Its reset logic asserts active-high push-pull RESET when VCC falls below 1.9V, MR is pulled low, or WDI remains static beyond 3.3s (typ). The internal timer guarantees reset deassertion only after ≥10ms once VCC exceeds 1.9V and MR/WDI conditions clear.
It operates across –40°C to +85°C with guaranteed reset validity down to VCC = 1.1V, immune to ≤40µs VCC transients at 100mV overdrive. The WDI input detects edges as short as 150ns and clears the watchdog on any rising/falling transition, MR assertion, or RESET assertion - ensuring robust software execution monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.9V ±2.5% - precisely trimmed to monitor 1.8V–1.9V supply rails without external resistors. |
| Supply Current | 170nA (typ) at +25°C - enables multi-year operation on coin-cell batteries in always-on devices. |
| Reset Timeout | 10ms (min) - ensures µP initialization completes before release, compatible with fast-boot MCUs. |
| Watchdog Timeout | 3.3s (typ), S-suffix - balances fault detection speed and software loop tolerance in embedded firmware. |
| Operating Voltage | 1.2V to 5.5V - supports direct integration with 1.8V, 3.3V, and 5V logic domains. |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup and drives µP reset pins directly. |
| VCC Immunity | Valid reset assertion down to VCC = 1.1V - maintains system safety during deep brownout conditions. |
Pinout & Package
Package: 5-pin SOT23 (lead-free, +T suffix), 2.9mm × 1.6mm footprint, 1.1mm height - optimized for space-constrained portable PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin directly; sinks/source up to 1.2mA at VCC ≥ 2.38V. |
| 2 | GND | Ground reference - must connect to system ground plane for noise immunity and accurate threshold sensing. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS levels; 1µs min pulse width. |
| 4 | WDI | Watchdog input - edge-sensitive (150ns min pulse); resets internal timer on rising/falling transitions. |
| 5 | VCC | Supply and monitored voltage input - requires 0.1µF bypass capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in glucose monitors and wearables beyond 5 years. |
| Factory-trimmed VTH | 1.9V ±2.5% threshold - eliminates calibration overhead and reduces BOM count vs. resistor-based supervisors. |
| Watchdog edge detection | 150ns minimum WDI pulse width - reliably captures fast firmware handshakes without false timeouts. |
| VCC transient immunity | No reset for ≤40µs transients at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments. |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = 1.1V - ensures fail-safe behavior during critical brownout recovery. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission and low-power MCU sleep cycles. IC Role / Device Role / Timing Role: Supervises 1.8V MCU supply, asserts RESET on brownout or firmware hang detected via WDI toggling. Use Value: 170nA ICC preserves CR2032 battery life >3 years; 10ms tRP aligns with ARM Cortex-M0+ wake-from-sleep timing. |
Use Scenario: Portable ECG/SpO₂ units operating from rechargeable Li-ion with intermittent sensor activation. IC Role / Device Role / Timing Role: Monitors 3.3V system rail, initiates hard reset if main processor fails to service WDI within 3.3s. Use Value: Active-high push-pull RESET directly interfaces with medical-grade µP reset inputs; 1.9V VTH matches LDO output tolerance. |
| Smart Wearables | Industrial Handheld Terminals |
Use Scenario: Fitness trackers with motion-activated display and ambient light sensing, powered by 3.7V Li-Po. IC Role / Device Role / Timing Role: Provides power-on reset and watchdog supervision for BLE SoC; MR enables user-initiated reboot. Use Value: SOT23-5 footprint saves PCB area; 1.9V threshold safeguards against LDO dropout during peak RF transmit current. |
Use Scenario: Rugged barcode scanners used in warehouse logistics, subject to ESD and supply ripple. IC Role / Device Role / Timing Role: Ensures deterministic boot sequence after hot-swap battery insertion or 12V-to-3.3V DC/DC instability. Use Value: Immunity to 40µs VCC glitches prevents misoperation in electrically noisy environments; MR supports field-service reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK19D1S+T | Active-low push-pull RESET output; identical VTH, tRP, tWD, and pinout except RESET polarity. | Requires inverted reset logic on µP side; unsuitable for systems where RESET must be active-high. | Select MAX6864UK19D1S+T only if host MCU accepts active-low reset and board layout allows signal inversion. |
| TPS3836K33DBVR | Fixed 3.08V reset threshold; no watchdog timer; 1.2µA ICC; same SOT23-5 package and MR function. | Lacks WDI supervision - suitable only for basic voltage monitoring without firmware execution validation. | Choose TPS3836K33DBVR for cost-sensitive, non-watchdog applications where 3.08V threshold matches system rail. |
Compared with MAX6864UK19D1S+T, the MAX6865UK19D1S+T provides native active-high reset drive, eliminating level-shifting components. Against TPS3836K33DBVR, it adds critical watchdog functionality and cuts supply current by >90%, enabling true nanopower system design.
Availability
MAX6865UK19D1S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, smart wearables, and industrial handheld terminals requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK19D1S+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 environments.
The MAX6865UK19D1S+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-critical medical and portable electronics needing ultra-low ICC, guaranteed low-VCC reset, and integrated watchdog supervision.
FAQ
What is the exact reset threshold voltage of the MAX6865UK19D1S+T?
The MAX6865UK19D1S+T has a factory-trimmed reset threshold of 1.9V, with ±2.5% tolerance over –40°C to +85°C. This value is confirmed by Maxim's Threshold Suffix Guide (suffix '19') and electrical characteristics table, where VTH = 1.9V under all operating conditions. The MAX6865UK19D1S+T uses this precise threshold to supervise 1.8V logic rails without external components.
Does the MAX6865UK19D1S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK19D1S+T includes a watchdog timer with a typical timeout of 3.3s, indicated by the 'S' suffix in the part number. Per Maxim's Watchdog Timeout Table, the S-suffix guarantees a minimum of 1.5s and maximum of 7.75s. The timer clears on any WDI edge, MR assertion, or RESET assertion - making the MAX6865UK19D1S+T suitable for firmware health monitoring in safety-critical portable devices.
What is the reset output configuration of the MAX6865UK19D1S+T?
The MAX6865UK19D1S+T features an active-high push-pull reset output on Pin 1. Unlike open-drain variants, it does not require an external pullup resistor and can directly drive standard µP reset inputs. Electrical specs confirm VOH ≥ 0.8 × VCC at ISOURCE = 500µA (VCC ≥ 2.38V), confirming robust drive strength. This configuration is fixed for the MAX6865UK19D1S+T and differs from MAX6864 (active-low) or MAX6866 (open-drain).
What is the minimum reset timeout period for the MAX6865UK19D1S+T?
The MAX6865UK19D1S+T has a minimum reset timeout period of 10ms, denoted by the 'D1' suffix. Per Maxim's Reset Timeout Periods table, D1 specifies min/typ/max values of 10ms/15ms/25ms. This duration ensures sufficient hold time for modern low-power MCUs to complete internal initialization before release. The MAX6865UK19D1S+T guarantees this timing across temperature and voltage ranges without external timing components.
Is the MAX6865UK19D1S+T compatible with 1.2V supply operation?
Yes, the MAX6865UK19D1S+T operates with VCC as low as 1.2V, per its Absolute Maximum Ratings and Electrical Characteristics tables. Crucially, it guarantees valid reset assertion down to VCC = 1.1V - meaning the MAX6865UK19D1S+T remains functional and safety-compliant even during deep brownout events below nominal 1.2V. This capability is explicitly tested and specified, distinguishing it from supervisors that lose reset validity near VCC minimum.
MAX6865UK19D1S+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:
- 1.9V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK19D1S+T FAQ
1.How can I place an order for MAX6865UK19D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK19D1S+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 MAX6865UK19D1S+T reliable?
The price and inventory of MAX6865UK19D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK19D1S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK19D1S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK19D1S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK19D1S+T?
MAX6865UK19D1S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK19D1S+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 MAX6865UK19D1S+T?
For technical support, including MAX6865UK19D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK19D1S+T requirements.
6.How does Aetrix verify that MAX6865UK19D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK19D1S+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 MAX6865UK19D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK19D1S+T?
All MAX6865UK19D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK19D1S+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 MAX6865UK19D1S+T part is unused and in its original packaging.
Return procedure for MAX6865UK19D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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