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Analog Devices Inc./Maxim Integrated MAX6864UK23D3S+T
- Part No.:
- MAX6864UK23D3S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6864UK23D3S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,670
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Product details
Overview
The MAX6864UK23D3S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.313V reset threshold, 150ms minimum reset timeout, and integrated watchdog timer with 3.3s typical timeout. It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout - designed for battery-powered medical and portable electronics requiring guaranteed reset validity down to VCC = +1.1V.
For engineers reviewing the MAX6864UK23D3S+T datasheet, MAX6864UK23D3S+T pinout, MAX6864UK23D3S+T application, or MAX6864UK23D3S+T equivalent, this page delivers verified specifications, functional pin roles, real-world use cases in glucose monitors and PDAs, and validated alternative options for low-power µP supervision with watchdog capability.
Technical Context
The MAX6864UK23D3S+T integrates three core functions: precision voltage monitoring with ±2.5% threshold accuracy over temperature, a manual reset input (MR) with 250ns delay and internal 10kΩ pullup, and a watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 3.3s (typ). Reset assertion is active-low push-pull, guaranteed valid down to VCC = +1.1V.
Its watchdog logic operates independently of VCC level during assertion but resumes timing only after reset deassertion; the device draws just 170nA (typ) at VCC = 1.8V with no load and no watchdog toggling - enabling multi-year operation on coin-cell batteries. Immunity to sub-40µs VCC transients at 100mV overdrive ensures robustness in noisy portable environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V - enables >10-year battery life in always-on glucose monitors. |
| Reset Threshold Voltage | 2.313V (±2.5%) - factory-trimmed for precise brownout detection on 2.5V or 3.3V rails. |
| Reset Timeout Period | 150ms minimum - ensures full µP initialization before release, per D3 option in Table 4. |
| Watchdog Timeout | 3.3s typical (S-suffix) - balances fault coverage and software execution margin in embedded firmware. |
| VCC Validity Range | Operates and asserts valid reset down to VCC = +1.1V - supports deep brownout recovery in low-voltage systems. |
| MR Input Logic | Active-low with 250ns delay and internal 10kΩ pullup - eliminates external components for momentary switch interface. |
| WDI Pulse Detection | Recognizes edges as short as 150ns - tolerates fast GPIO toggling without missed watchdog clears. |
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-low push-pull reset output; sinks current when asserted, referenced to VCC; no external pullup required. |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane for noise immunity. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS levels or open-drain signals. |
| 4 | WDI | Watchdog input; rising or falling edge clears internal timer; static high/low >3.3s triggers reset. |
| 5 | VCC | Primary supply and monitored voltage rail; requires 0.1µF bypass capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables decade-scale operation on CR2032 cells in portable medical devices. |
| Guaranteed reset validity | RESET output remains functional down to VCC = +1.1V - critical for reliable brownout recovery in low-VCC systems. |
| No external components | Integrated MR pullup (10kΩ), no timing capacitors, and fixed reset timeout eliminate BOM cost and layout area. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in electrically noisy handheld equipment. |
| Watchdog edge sensitivity | Detects 150ns WDI pulses - supports high-frequency firmware watchdog clearing without timing margin loss. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission powered by single coin cell. IC Role / Device Role / Timing Role: Supervises 1.8V MCU power rail, asserts reset on brownout or firmware hang via WDI, guarantees clean boot after battery insertion. Use Value: 170nA ICC extends battery life beyond 2 years; 2.313V threshold matches LDO output; 3.3s watchdog aligns with sensor measurement cycle. |
Use Scenario: Portable ECG device with real-time waveform display and memory logging. IC Role / Device Role / Timing Role: Monitors 3.3V system rail, initiates hard reset on power instability or software lockup, provides 150ms reset hold for flash reinitialization. Use Value: Push-pull RESET drives MCU reset pin directly; VCC = +1.1V validity ensures reset during final battery discharge phase. |
| PDAs | MP3 Players |
Use Scenario: Legacy PDA with ARM9 processor, SD card storage, and backlight control. IC Role / Device Role / Timing Role: Provides power-on reset, manual reset via front-panel button, and watchdog supervision of UI task scheduler. Use Value: MR internal pullup eliminates discrete resistor; SOT23-5 footprint saves PCB space; 150ms tRP accommodates slow peripheral wake-up. |
Use Scenario: Flash-based audio player with USB charging and OLED display. IC Role / Device Role / Timing Role: Supervises 2.5V codec and 3.3V MCU rails, triggers reset on undervoltage or frozen playback engine via WDI. Use Value: 2.313V threshold precisely targets 2.5V rail tolerance; 3.3s watchdog allows full song decode before timeout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6865UK23D3S+T | Active-high push-pull RESET output instead of active-low; identical threshold, timeout, and watchdog specs. | Required when MCU reset pin is active-high (e.g., certain ARM Cortex-M variants). | Select MAX6865UK23D3S+T only if system-level reset polarity demands high-true signaling. |
| TPS3836K23DBVR | 1.8V–5.5V supply range; 2.32V threshold; 200ms reset timeout; no integrated watchdog timer. | Suitable for basic voltage monitoring where software-level watchdog is handled externally. | Choose TPS3836K23DBVR when watchdog functionality is unnecessary and TI sourcing preference applies. |
Compared with MAX6864UK23D3S+T, MAX6865UK23D3S+T offers identical supervision performance with inverted reset polarity, while TPS3836K23DBVR provides threshold-matched voltage monitoring without watchdog - making the MAX6864UK23D3S+T uniquely suited for firmware-hang protection in ultra-low-power medical and portable designs.
Availability
MAX6864UK23D3S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and portable data assistants requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6864UK23D3S+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 consumer markets.
The MAX6864UK23D3S+T belongs to the nanopower µP supervisory family, engineered specifically for battery-critical portable and medical electronics needing ultra-low ICC, guaranteed reset validity at low VCC, and integrated watchdog safety.
FAQ
What is the exact reset threshold voltage of the MAX6864UK23D3S+T?
The MAX6864UK23D3S+T has a factory-trimmed reset threshold voltage of 2.313V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix '23' corresponds to VTH = 2.313V (typ). The MAX6864UK23D3S+T maintains this accuracy without external calibration.
Does the MAX6864UK23D3S+T require an external pullup resistor on the RESET pin?
No, the MAX6864UK23D3S+T features a push-pull active-low RESET output, which actively drives both high and low states - eliminating the need for an external pullup resistor. This is explicitly stated in the Pin Description section for MAX6864/MAX6865/MAX6866, confirming RESET is referenced to VCC and requires no external components for proper operation.
How does the watchdog timer in the MAX6864UK23D3S+T respond to firmware activity?
The MAX6864UK23D3S+T watchdog timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static (high or low) for longer than 3.3s (typ). It does not require high-low-high toggling - a single edge suffices. The timer remains suspended while RESET is asserted and resumes counting immediately upon deassertion, ensuring deterministic fault coverage aligned with software execution flow.
Can the MAX6864UK23D3S+T operate reliably at VCC = 1.2V?
Yes, the MAX6864UK23D3S+T is fully specified to operate and assert a valid reset signal down to VCC = +1.1V, as guaranteed in the Electrical Characteristics table. At VCC = 1.2V, all functions - including voltage monitoring, MR response, and watchdog timing - remain functional, making it suitable for deep brownout recovery in low-voltage battery systems.
What is the minimum pulse width the MR input accepts on the MAX6864UK23D3S+T?
The MR input of the MAX6864UK23D3S+T accepts a minimum pulse width of 1µs, as specified in the Electrical Characteristics table under "MR Minimum Pulse Width (tMPW)". Additionally, it provides 200ns glitch rejection, ensuring noise spikes on the manual reset line do not cause unintended resets - critical for reliable front-panel button interfacing in portable equipment.
MAX6864UK23D3S+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:
- 2.313V
- 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
MAX6864UK23D3S+T FAQ
1.How can I place an order for MAX6864UK23D3S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6864UK23D3S+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 MAX6864UK23D3S+T reliable?
The price and inventory of MAX6864UK23D3S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6864UK23D3S+T is usually 5 days.
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Once your MAX6864UK23D3S+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 MAX6864UK23D3S+T?
For technical support, including MAX6864UK23D3S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6864UK23D3S+T requirements.
6.How does Aetrix verify that MAX6864UK23D3S+T is sourced from the original manufacturer or authorized distributors?
All MAX6864UK23D3S+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 MAX6864UK23D3S+T meets industry standards.
7.What is the process for return or replacement of MAX6864UK23D3S+T?
All MAX6864UK23D3S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6864UK23D3S+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 MAX6864UK23D3S+T part is unused and in its original packaging.
Return procedure for MAX6864UK23D3S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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