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Analog Devices Inc./Maxim Integrated MAX6865UK19D5L+T
- Part No.:
- MAX6865UK19D5L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK19D5L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,349
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Product details
Overview
MAX6865UK19D5L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.9V reset threshold (±2.5%), 300ms minimum reset timeout (D5), and watchdog timer with 209s typical timeout (L suffix). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog expiration - designed for battery-powered medical and portable electronics requiring guaranteed reset validity down to VCC = +1.1V.
For engineers reviewing the MAX6865UK19D5L+T datasheet, MAX6865UK19D5L+T pinout, MAX6865UK19D5L+T application, or MAX6865UK19D5L+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters (tRP = 300ms min, tWD = 209s typ), reset output type (active-high push-pull), and validated alternatives for low-power µP supervision in space- and energy-constrained systems.
Technical Context
The MAX6865UK19D5L+T integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. Its reset assertion logic combines three independent triggers: VCC falling below 1.9V, MR pulled low, or WDI inactivity exceeding 209s - all forcing active-high RESET for ≥300ms after recovery.
It uses internal 10kΩ MR pullup, supports noise-immune operation with 200ns MR glitch rejection, and guarantees valid RESET output down to VCC = +1.1V. The watchdog clears on any WDI edge (min pulse width 150ns) and remains disabled during asserted reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C - enables multi-year battery life in glucose monitors and pagers. |
| Reset Threshold | 1.9V ±2.5% - factory-trimmed for precise brownout detection on 2.0V–2.5V logic rails. |
| Reset Timeout | 300ms minimum (D5 option) - ensures full µP initialization before release from reset. |
| Watchdog Timeout | 209s typical (L suffix) - suitable for long-cycle firmware tasks without false triggers. |
| RESET Output Type | Active-high push-pull - eliminates external pullup, drives directly into CMOS inputs. |
| VCC Operating Range | 1.2V to 5.5V - supports supervision of core voltages from ultra-low-power MCUs to 3.3V/5V peripherals. |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains deterministic reset state during deep brownout. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-lead SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault conditions; no external pullup required. |
| 2 | GND | Ground reference - must be connected to system ground plane for stable reset threshold and noise immunity. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic or momentary switch to GND. |
| 4 | WDI | Watchdog input - requires edge transitions (rising/falling) every <209s to prevent reset; immune to <200ns glitches. |
| 5 | VCC | Supply and monitored voltage input - powers device and sets reset threshold reference; bypass with 0.1µF to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical - reduces quiescent power by >99% vs. standard supervisors, critical for coin-cell applications. |
| Immunity to VCC transients | Rejects ≤40µs transients at 100mV overdrive - prevents spurious resets in noisy DC-DC environments. |
| MR glitch rejection | 200ns minimum - eliminates false resets from ESD or PCB coupling without external RC filtering. |
| No external components | Self-contained supervision - requires only 0.1µF VCC bypass capacitor; no timing resistors or pullups needed. |
| Valid RESET at low VCC | Guaranteed operation down to VCC = +1.1V - ensures fail-safe behavior during battery depletion. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power MCU sleep cycles. IC Role / Device Role / Timing Role: Supervises 1.8V MCU core rail; asserts RESET on battery sag or software hang detected via WDI. Use Value: 170nA ICC extends CR2032 battery life beyond 2 years; 209s watchdog accommodates extended sensor calibration routines. |
Use Scenario: Portable ECG and SpO₂ units operating from rechargeable Li-ion with intermittent wireless upload. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and initiates hard reset if firmware locks during data transmission. Use Value: 300ms D5 timeout ensures complete ADC and radio initialization; 1.9V threshold matches LDO dropout margin. |
| MP3 Players | Smart Pagers |
|
Use Scenario: Flash-based audio players with deep-sleep modes and mechanical button wake-up. IC Role / Device Role / Timing Role: Provides power-on reset and manual reset via button (MR), while WDI guards against codec lockup. Use Value: Active-high push-pull RESET interfaces directly with audio SoC reset pin; no level-shifting required. |
Use Scenario: Two-way pagers receiving encrypted messages over FSK radio, requiring reliable boot after RF interference. IC Role / Device Role / Timing Role: Detects VCC droop during RX burst and resets MCU if WDI stalls due to corrupted packet handling. Use Value: 1.9V threshold aligns with 2.0V LDO output; 200ns MR glitch rejection prevents false resets from RF-induced noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK19D5L+T | No RESET output - open-drain active-low only; same VTH, tRP, tWD, and pinout except Pin 1 function. | Requires external pullup resistor and level-shifting for µPs with active-low reset inputs. | Select when interfacing to legacy µPs needing open-drain reset or when board layout already includes pullup. |
| TPS3837K25DBVR | Fixed 2.5V reset threshold; 200ms reset timeout; no watchdog; 2.5µA ICC - 15× higher supply current. | Lacks WDI functionality; unsuitable for firmware hang detection; limited to fixed-threshold designs. | Choose only for cost-sensitive, non-watchdog applications where 2.5V rail supervision suffices and 170nA is not required. |
Compared with MAX6865UK19D5L+T, MAX6864UK19D5L+T trades push-pull convenience for open-drain flexibility, while TPS3837K25DBVR sacrifices nanopower operation and watchdog capability for lower unit cost in static supervision roles.
Availability
MAX6865UK19D5L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and smart pagers requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6865UK19D5L+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 interface applications in industrial, medical, and portable systems.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-critical devices, emphasizing sub-µA quiescent current, wide VCC range, and integrated watchdog reliability.
FAQ
What is the exact reset threshold voltage of MAX6865UK19D5L+T?
The MAX6865UK19D5L+T has a factory-trimmed reset threshold of 1.9V 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 "19" corresponds to 1.9V nominal. The threshold remains stable across temperature, with normalized variation ≤±0.5% from -40°C to +85°C per Figure toc06.
Does MAX6865UK19D5L+T support active-high or active-low reset output?
MAX6865UK19D5L+T provides an active-high push-pull reset output (RESET pin). When asserted, RESET goes high; when deasserted, it returns low. This is confirmed in the MAX6865-specific pin description (page 8) and Selector Guide (page 16), which lists MAX6865 under "Push-Pull ACTIVE HIGH" with MR and WDI support.
What is the watchdog timeout period for MAX6865UK19D5L+T?
The MAX6865UK19D5L+T features a watchdog timeout period of 209s typical (L suffix), with min/max values of 95s/487s over temperature. This is specified in Table 3 ("Watchdog Timeout") and confirmed in the Ordering Information section, where "L" follows the D5 timeout code in the part number.
Can MAX6865UK19D5L+T operate with VCC below 1.5V?
Yes - MAX6865UK19D5L+T operates from VCC = 1.2V to 5.5V and guarantees valid reset output down to VCC = +1.1V. Electrical Characteristics table confirms supply voltage min = 1.2V (TA = -40°C to +85°C), and the "Guaranteed Reset Valid to VCC = +1.1V" feature is explicitly stated in the datasheet Features list.
Is MAX6865UK19D5L+T pin-compatible with other devices in the MAX68xx family?
MAX6865UK19D5L+T shares the identical 5-pin SOT23-5 pinout with MAX6864, MAX6866, MAX6867, MAX6868, and MAX6869 - all have RESET (Pin 1), GND (Pin 2), MR (Pin 3), WDI (Pin 4), and VCC (Pin 5). However, it is not pin-compatible with MAX6854/MAX6855/MAX6856 (no WDI) or MAX6861/MAX6862/MAX6863 (CT instead of WDI).
MAX6865UK19D5L+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:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK19D5L+T FAQ
1.How can I place an order for MAX6865UK19D5L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK19D5L+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 MAX6865UK19D5L+T reliable?
The price and inventory of MAX6865UK19D5L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK19D5L+T is usually 5 days.
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Once your MAX6865UK19D5L+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 MAX6865UK19D5L+T?
For technical support, including MAX6865UK19D5L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK19D5L+T requirements.
6.How does Aetrix verify that MAX6865UK19D5L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK19D5L+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 MAX6865UK19D5L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK19D5L+T?
All MAX6865UK19D5L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK19D5L+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 MAX6865UK19D5L+T part is unused and in its original packaging.
Return procedure for MAX6865UK19D5L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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