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Analog Devices Inc./Maxim Integrated MAX6864UK29D3L+T
- Part No.:
- MAX6864UK29D3L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6864UK29D3L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6864UK29D3L+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, 300ms minimum reset timeout, and 209s typical watchdog timeout. It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout - designed for battery-critical portable medical and handheld devices.
For engineers reviewing the MAX6864UK29D3L+T datasheet, MAX6864UK29D3L+T pinout, MAX6864UK29D3L+T application, or MAX6864UK29D3L+T equivalent, this page delivers verified functional identity, exact timing parameters, validated watchdog behavior, and confirmed SOT23-5 terminal mapping - all aligned with Maxim's official electrical characteristics and pin descriptions.
Technical Context
The MAX6864UK29D3L+T integrates three core functions: precision voltage monitoring with ±2.5% threshold accuracy over temperature, a glitch-immune manual reset input with 250ns MR-to-reset delay and internal 10kΩ pullup, and a watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 209s (typ). Its reset assertion is guaranteed valid down to VCC = +1.1V.
It uses a BiCMOS process (2848 transistors) and operates across –40°C to +85°C. The device asserts active-low push-pull RESET when VCC falls below 2.925V, MR is pulled low, or WDI stalls - holding RESET low for ≥300ms after recovery. No external components are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries |
| Reset Threshold Voltage | 2.925V (±2.5%) - factory-trimmed to match 3.0V system rails with margin |
| Reset Timeout Period | 300ms min (D3 option) - ensures full µP initialization before release |
| Watchdog Timeout | 209s typ (L suffix) - supports long-loop firmware without spurious resets |
| VCC Operating Range | 1.2V to 5.5V - compatible with 1.8V, 2.5V, 3.3V, and 5V logic domains |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains reliable reset assertion during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm height - optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; drives low during fault conditions and holds for ≥300ms post-recovery |
| 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 (10kΩ); accepts CMOS logic or momentary switch to GND |
| 4 | WDI | Watchdog input; edge-sensitive (150ns min pulse); resets internal timer on rising/falling transition |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors |
| Watchdog immunity to noise | WDI detects edges ≥150ns and ignores transients - prevents false timeouts in EMI-prone environments |
| Reset validity at low VCC | RESET asserted reliably down to VCC = +1.1V - critical for brownout recovery in Li-ion systems |
| No external components | Internal MR pullup, precision voltage reference, and timing capacitor eliminate BOM cost and layout area |
| Transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - avoids nuisance resets during switching noise |
Applications
| Portable Glucose Monitor | Patient Vital Signs Recorder |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 3.0V rail, asserts reset on power-up/brownout, and triggers watchdog reset if firmware hangs during sensor calibration. Use Value: 170nA ICC extends battery life to >3 years; 2.925V threshold matches 3.0V nominal rail with 75mV safety margin. |
Use Scenario: Wearable ECG patch logging heart rate and SpO₂ for 72-hour clinical studies. IC Role / Device Role / Timing Role: Monitors 1.8V MCU supply, initiates manual reset via button press, and enforces 209s watchdog timeout to recover from firmware lockups. Use Value: 300ms reset timeout ensures full RAM initialization; push-pull RESET eliminates pullup resistor, saving board space. |
| Industrial Handheld Scanner | Smart Hearing Aid Controller |
Use Scenario: Rugged barcode scanner with cold-temperature operation (–20°C) and intermittent 5V USB charging. IC Role / Device Role / Timing Role: Detects VCC drop during battery swap, asserts reset to prevent corrupted flash writes, and monitors firmware execution via WDI. Use Value: Guaranteed operation down to –40°C; 209s watchdog accommodates long decode routines without false triggers. |
Use Scenario: Rechargeable hearing aid using 1.2V NiMH battery with ultra-low-power DSP and RF streaming. IC Role / Device Role / Timing Role: Supervises 1.2V supply rail, provides manual reset via touch interface, and guards against DSP freeze during audio processing. Use Value: Valid reset assertion at VCC = +1.1V ensures reliability near end-of-discharge; 170nA ICC preserves microamp-level sleep current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK29D3S+T | Same package, reset threshold, and timeout - but 3.3s (not 209s) watchdog period | Better suited for fast-response embedded control loops requiring frequent WDI toggling | Select when firmware executes short deterministic cycles and demands tighter watchdog supervision |
| TPS3836K33DBVR | 3.3V fixed threshold, 200ms reset timeout, no watchdog timer, SOT23-5 package | Lacks WDI functionality - requires external watchdog or software-only monitoring | Choose only if system already implements independent watchdog logic and needs simpler voltage monitor |
Compared with MAX6864UK29D3S+T, the MAX6864UK29D3L+T provides 63× longer watchdog timeout for infrequent-firmware-check applications; versus TPS3836K33DBVR, it adds integrated watchdog capability and lower ICC, eliminating design complexity and reducing total solution current.
Availability
MAX6864UK29D3L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered industrial scanners, and low-power wearable electronics requiring stable component supply across extended production lifecycles.
Supply support for MAX6864UK29D3L+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 - emphasizing ultra-low power, high reliability, and small-footprint integration.
The MAX6864UK29D3L+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-constrained portable and medical electronics where multi-year operation and fail-safe reset integrity are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6864UK29D3L+T?
The MAX6864UK29D3L+T has a factory-trimmed reset threshold voltage 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 MAX6864UK29D3L+T maintains this accuracy without external calibration.
Does the MAX6864UK29D3L+T include a watchdog timer, and what is its timeout?
Yes, the MAX6864UK29D3L+T includes an integrated watchdog timer with a typical timeout of 209 seconds (L suffix), with min/max values of 95s/487s. The timer resets on any rising or falling edge at WDI and expires only if WDI remains static beyond the timeout - a behavior explicitly defined in Table 3 and Electrical Characteristics.
What is the reset timeout period for the MAX6864UK29D3L+T, and is it adjustable?
The MAX6864UK29D3L+T has a fixed reset timeout period of 300ms minimum (D3 suffix), with typical and maximum values of 225ms and 300ms respectively. It is not adjustable - unlike MAX6861–MAX6863 variants, the MAX6864UK29D3L+T does not feature a CT pin or programmable timeout selection.
What output type does the MAX6864UK29D3L+T RESET pin provide?
The MAX6864UK29D3L+T provides an active-low push-pull RESET output (Pin 1), as confirmed in the MAX6864/MAX6865/MAX6866 Pin Description section. This eliminates the need for an external pullup resistor and ensures strong drive capability across its full VCC range (1.2V–5.5V).
Is the MAX6864UK29D3L+T compatible with 1.8V microcontrollers?
Yes, the MAX6864UK29D3L+T operates from VCC = 1.2V to 5.5V and guarantees valid RESET assertion down to VCC = +1.1V. Its MR input accepts logic levels referenced to VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), making it fully interoperable with 1.8V µPs - confirmed in Electrical Characteristics and Applications Information sections.
MAX6864UK29D3L+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:
- Active
- 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:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6864UK29D3L+T FAQ
1.How can I place an order for MAX6864UK29D3L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6864UK29D3L+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 MAX6864UK29D3L+T reliable?
The price and inventory of MAX6864UK29D3L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6864UK29D3L+T is usually 5 days.
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Once your MAX6864UK29D3L+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 MAX6864UK29D3L+T?
For technical support, including MAX6864UK29D3L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6864UK29D3L+T requirements.
6.How does Aetrix verify that MAX6864UK29D3L+T is sourced from the original manufacturer or authorized distributors?
All MAX6864UK29D3L+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 MAX6864UK29D3L+T meets industry standards.
7.What is the process for return or replacement of MAX6864UK29D3L+T?
All MAX6864UK29D3L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6864UK29D3L+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 MAX6864UK29D3L+T part is unused and in its original packaging.
Return procedure for MAX6864UK29D3L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6864UK29D3L+T Tags
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