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Analog Devices Inc./Maxim Integrated MAX6865UK29D1L+T
- Part No.:
- MAX6865UK29D1L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK29D1L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,825
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Product details
Overview
The MAX6865UK29D1L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.925V reset threshold, 10ms minimum reset timeout, and integrated watchdog timer with 209s typical timeout. It monitors VCC, responds to manual reset (MR), and asserts active-high push-pull RESET during brownout, power-up, or watchdog expiration - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK29D1L+T datasheet, MAX6865UK29D1L+T pinout, MAX6865UK29D1L+T application, or MAX6865UK29D1L+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, 209s watchdog timeout option, and compatibility with 1.2V–5.5V supply rails in space-constrained portable systems.
Technical Context
This device integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. Its reset assertion logic triggers on VCC falling below 2.925V ±2.5%, MR low pulse ≥1µs, or WDI inactivity exceeding 209s (typ). The internal timer ensures RESET remains asserted for ≥10ms after recovery.
The watchdog circuit clears on any WDI edge (rising/falling), MR assertion, or RESET assertion - enabling robust software execution monitoring. Push-pull active-high RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load when asserted, supporting direct interface with µP reset inputs without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V; enables multi-year battery life in always-on medical sensors. |
| Reset Threshold | 2.925V ±2.5%; factory-trimmed for precise brownout detection on 3.0V/3.3V rails. |
| Reset Timeout | 10ms min; ensures µP completes power stabilization before release from reset state. |
| Watchdog Timeout | 209s typ (L-suffix); supports long-cycle firmware tasks while preventing lockup. |
| VCC Operating Range | 1.2V to 5.5V; operates across Li-ion, coin-cell, and regulated 1.8V/2.5V/3.3V supplies. |
| RESET Validity | Guaranteed to VCC = +1.1V; maintains valid logic level through deep brownout conditions. |
| MR Input Logic | Active-low, internally pulled up to VCC via 10kΩ; accepts CMOS levels, no external components needed. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, -40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives µP reset pin directly; no external pullup required. |
| 2 | GND | Ground reference for all internal circuits and reset timing; must connect to system ground plane. |
| 3 | MR | Active-low manual reset input; initiates reset when pulled low ≥1µs; internally pulled up to VCC. |
| 4 | WDI | Watchdog input; requires edge transitions (rising/falling) every <209s to prevent timeout-induced reset. |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in portable medical devices beyond 5 years. |
| Watchdog Immunity | Clears on any WDI edge - prevents false timeout from stuck-loop software or static I/O states. |
| VCC Transient Rejection | Immune to VCC glitches ≤40µs at 100mV overdrive - avoids spurious resets in noisy power environments. |
| No External Components | Integrated MR pullup, precision voltage reference, and timing capacitors eliminate BOM cost and layout area. |
| Valid RESET at Low VCC | RESET remains logic-valid down to VCC = +1.1V - ensures deterministic µP behavior during deep brownout. |
Applications
| Glucose Monitor | Patient Monitor |
|---|---|
Use Scenario: Continuous glucose sensing in wearable patch pumps with coin-cell power. IC Role / Device Role / Timing Role: Supervises 3.0V regulated rail and validates µP boot sequence after sensor wake-up. Use Value: 170nA ICC minimizes battery drain; 209s watchdog timeout accommodates extended calibration routines without false reset. |
Use Scenario: Portable ECG and SpO₂ units powered by dual AA alkaline cells. IC Role / Device Role / Timing Role: Monitors decaying 3.0V rail and asserts RESET before ADC reference collapse. Use Value: 2.925V threshold matches nominal battery voltage; 10ms timeout ensures stable analog front-end initialization. |
| MP3 Player | Cell Phone Baseband |
Use Scenario: Flash-based audio players using Li-ion batteries with dynamic voltage scaling. IC Role / Device Role / Timing Role: Detects VCC sag during high-current DAC playback and triggers controlled restart. Use Value: Immunity to 40µs transients prevents reset during transient load spikes; push-pull RESET drives baseband µP directly. |
Use Scenario: Low-power cellular modem subsystem with aggressive sleep/wake cycles. IC Role / Device Role / Timing Role: Watches firmware execution via WDI toggling and forces reset on hang during RF handover. Use Value: 209s watchdog period aligns with maximum allowed idle time before network re-registration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK29D1L+T | Same 2.925V threshold, 10ms timeout, 209s watchdog, but active-low push-pull RESET output. | Requires inverted reset logic on µP side; unsuitable where active-high RESET is mandatory. | Select MAX6864UK29D1L+T only if target µP accepts active-low reset assertion. |
| TPS3837K29DBVR | 2.93V threshold, 200ms min timeout, no watchdog timer, 1.6V–6.0V VCC range. | Lacks watchdog functionality; suited for simple power-monitoring-only designs without software supervision. | Choose TPS3837K29DBVR when watchdog capability is unnecessary and longer reset hold time is acceptable. |
Compared with MAX6865UK29D1L+T, MAX6864UK29D1L+T provides identical supervision parameters but inverted RESET polarity - requiring µP-level logic adaptation - while TPS3837K29DBVR offers broader VCC range but omits watchdog, limiting use to non-critical embedded control.
Availability
MAX6865UK29D1L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and low-power wireless modules requiring stable component supply across industrial temperature ranges.
Supply support for MAX6865UK29D1L+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6854–MAX6869 family delivers nanopower supervisory functions targeting battery-critical portable electronics - emphasizing ultra-low ICC, wide VCC range, and integrated watchdog for firmware reliability.
FAQ
What is the exact reset threshold voltage of the MAX6865UK29D1L+T?
The MAX6865UK29D1L+T has a factory-trimmed reset threshold of 2.925V with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "29" corresponds to 2.925V nominal. The threshold remains stable across temperature, with normalized variation ≤±0.5% from -40°C to +85°C per typical characteristics graph.
Does the MAX6865UK29D1L+T require external components for basic operation?
No, the MAX6865UK29D1L+T operates without external components: MR is internally pulled up to VCC via 10kΩ, RESET is push-pull active-high (no pullup needed), and timing is fully internal. Only a 0.1µF bypass capacitor on VCC to GND is recommended for noise immunity - no RC networks, pullups, or timing capacitors are required for standard supervision or watchdog functionality.
How does the watchdog timer in the MAX6865UK29D1L+T respond to software hangs?
The MAX6865UK29D1L+T watchdog timer expires if WDI remains static (high or low) for >209s (typ). It clears on any rising or falling edge at WDI, so firmware must toggle WDI at least once per timeout period. During reset assertion, the timer halts; it resumes counting only after RESET deasserts - ensuring reliable detection of locked-up code without false triggers from reset sequences.
Can the MAX6865UK29D1L+T operate reliably at VCC = 1.3V?
Yes, the MAX6865UK29D1L+T guarantees functional operation and valid RESET output down to VCC = +1.1V per Absolute Maximum Ratings and Electrical Characteristics tables. At 1.3V, supply current remains ~190nA (typ), reset threshold holds within spec, and RESET output maintains VOH ≥0.8×VCC and VOL ≤0.3V - enabling robust brownout handling in deeply discharged battery scenarios.
What is the minimum pulse width required on the MR input of the MAX6865UK29D1L+T?
The MR input of the MAX6865UK29D1L+T requires a minimum low pulse width of 1µs to initiate a reset, as specified in the Electrical Characteristics table under "MR Minimum Pulse Width (tMPW)". The device also rejects MR glitches <200ns, ensuring noise immunity in electrically harsh environments like portable medical equipment with motorized actuators or RF sections.
MAX6865UK29D1L+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:
- 2.925V
- 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
MAX6865UK29D1L+T FAQ
1.How can I place an order for MAX6865UK29D1L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK29D1L+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 MAX6865UK29D1L+T reliable?
The price and inventory of MAX6865UK29D1L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK29D1L+T is usually 5 days.
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Once your MAX6865UK29D1L+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 MAX6865UK29D1L+T?
For technical support, including MAX6865UK29D1L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK29D1L+T requirements.
6.How does Aetrix verify that MAX6865UK29D1L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK29D1L+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 MAX6865UK29D1L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK29D1L+T?
All MAX6865UK29D1L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK29D1L+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 MAX6865UK29D1L+T part is unused and in its original packaging.
Return procedure for MAX6865UK29D1L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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