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Analog Devices Inc./Maxim Integrated MAX6856UK16D4+T
- Part No.:
- MAX6856UK16D4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6856UK16D4+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,366
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Product details
Overview
The MAX6856UK16D4+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 1.575V reset threshold (suffix '16'), and 1200ms minimum reset timeout (suffix 'D4'). It monitors VCC, provides manual reset via MR input, and asserts an active-low open-drain RESET output-designed for reliable power-up/brownout protection in battery-powered medical and portable electronics.
For engineers reviewing the MAX6856UK16D4+T datasheet, MAX6856UK16D4+T pinout, MAX6856UK16D4+T application, or MAX6856UK16D4+T equivalent, this page delivers verified electrical parameters, functional pin roles, real-world use cases in glucose monitors and patient monitors, and two validated alternative parts with documented technical and application differences.
Technical Context
This device implements a precision voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, guaranteed RESET validity down to VCC = +1.1V, and immunity to VCC transients ≤40µs at 100mV overdrive. Its internal timer ensures reset assertion persists for ≥1200ms after VCC rises above threshold and MR deasserts.
The MAX6856UK16D4+T lacks watchdog timer (WDI) and CT select inputs-confirmed by Selector Guide and Pin Description tables-and uses only VCC, GND, MR, RESET, and NC (pin 1) terminals. Its open-drain RESET requires an external pullup and supports logic-level interfacing up to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C; enables multi-year operation on coin-cell batteries in always-on medical sensors. |
| Reset Threshold Voltage | 1.575V ±2.5%; factory-trimmed for precise brownout detection of 1.8V/1.5V logic rails. |
| Reset Timeout Period | 1200ms minimum; ensures full µP initialization and firmware boot sequence completion before release. |
| VCC Operating Range | 1.2V to 5.5V; supports wide-input battery systems including single Li-ion, dual alkaline, or regulated 3.3V/2.5V supplies. |
| RESET Output Type | Active-low open-drain; allows level-shifting to higher-voltage reset domains (e.g., 5V µP) using external pullup. |
| MR Input Behavior | Active-low with 10kΩ internal pullup; accepts CMOS logic or momentary switch without external components. |
| Guaranteed RESET Validity | Down to VCC = +1.1V; maintains deterministic reset state during deep brownout, preventing runaway code execution. |
Pinout & Package
Package: 5-pin SOT23-5 (lead-free, +T suffix), footprint-compatible with industry-standard 5-lead SOT-23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | Internally unconnected; must be left floating or tied to GND per layout best practice for noise immunity. |
| 2 | GND | Ground reference for all internal circuits; requires low-impedance connection to system ground plane. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); triggers reset when pulled ≤0.3×VCC. |
| 4 | RESET | Active-low open-drain output; sinks current when asserted; requires external pullup resistor to target logic rail. |
| 5 | VCC | Supply input and monitored voltage rail; bypass with 0.1µF ceramic capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in continuous-monitoring devices like glucose meters. |
| No external components | Integrates voltage reference, timer, and reset logic-eliminates discrete R/C networks and reduces BOM count. |
| Transient immunity | Immune to VCC glitches ≤40µs duration at 100mV overdrive, preventing spurious resets in noisy portable environments. |
| Open-drain RESET | Supports mixed-voltage systems: e.g., monitors 1.8V VCC but pulls up to 3.3V or 5V reset domain for legacy µPs. |
| Guaranteed operation to 1.1V | Ensures reset remains valid through deep brownout, critical for fail-safe behavior in implantable or diagnostic equipment. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 1.8V sensor and RF SoC supply; asserts RESET during battery voltage sag below 1.575V. Use Value: Prevents corrupted sensor readings or failed BLE handshakes by ensuring full µP reboot before data acquisition resumes. |
Use Scenario: Multi-parameter bedside monitor with ECG, SpO₂, and NIBP modules powered from rechargeable Li-ion. IC Role / Device Role / Timing Role: Monitors main 3.3V system rail; holds RESET for 1200ms to guarantee FPGA configuration and ADC calibration complete. Use Value: Eliminates intermittent display freezes or parameter dropouts caused by marginal power during AC adapter switchover. |
| Portable ECG Devices | Wearable Health Trackers |
Use Scenario: Handheld single-lead ECG with flash storage and USB charging, operating on CR2032 coin cell. IC Role / Device Role / Timing Role: Resets ARM Cortex-M0+ MCU when VCC drops below 1.575V during high-current ECG sampling bursts. Use Value: Avoids memory corruption in flash log buffers by enforcing clean restart before next acquisition cycle. |
Use Scenario: Fitness band with optical heart-rate sensor, accelerometer, and BLE radio running 24/7 on 30mAh battery. IC Role / Device Role / Timing Role: Provides brownout protection for 1.5V sensor hub; open-drain RESET interfaces to 2.8V BLE SoC reset pin. Use Value: Extends usable battery life by enabling 1.2V operation while maintaining deterministic reset behavior down to 1.1V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | Fixed 3.08V reset threshold; 200ms timeout; push-pull active-low RESET; no MR input. | Suitable for 3.3V systems only; lacks manual reset-requires external circuitry for operator-initiated reboot. | Select when system operates strictly at 3.3V and manual reset is handled elsewhere; not drop-in for MAX6856UK16D4+T's 1.575V/1200ms/MR requirements. |
| MAX6361KA29D3+T | 1.68V reset threshold (±2.5%); 150ms timeout; 1.2µA supply current; open-drain RESET; includes MR. | Higher ICC limits battery life in ultra-low-power designs; shorter timeout may not accommodate slow-boot µPs. | Choose for cost-sensitive industrial controls where 1.68V threshold aligns and 150ms suffices; avoid in medical wearables requiring sub-µA ICC and long timeouts. |
Compared with TPS3836K33DBVR and MAX6361KA29D3+T, the MAX6856UK16D4+T uniquely combines 1.575V precision threshold, 1200ms timeout, MR support, and 170nA ICC-making it irreplaceable in long-life, low-voltage medical sensors where all four parameters are simultaneously required.
Availability
MAX6856UK16D4+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and portable ECG devices requiring stable component supply across extended production lifecycles and stringent medical-grade traceability.
Supply support for MAX6856UK16D4+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 demanding applications in industrial, medical, and communications markets.
The MAX6856UK16D4+T belongs to the MAX685x nanopower supervisory family, engineered specifically for ultra-low-power, battery-critical systems where reset reliability and multi-year operation are non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX6856UK16D4+T?
The MAX6856UK16D4+T has a factory-trimmed reset threshold voltage of +1.575V, 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 '16' explicitly corresponds to 1.575V. The MAX6856UK16D4+T maintains this accuracy without external calibration.
Does the MAX6856UK16D4+T include a watchdog timer function?
No, the MAX6856UK16D4+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input; the MAX6856UK16D4+T is a dedicated voltage monitor with manual reset (MR) and open-drain RESET output. Its part number contains no watchdog suffix (e.g., 'S' or 'L'), confirming absence of watchdog functionality.
What is the function of Pin 1 on the MAX6856UK16D4+T?
Pin 1 of the MAX6856UK16D4+T is a No Connect (NC) terminal-internally unconnected and electrically inactive. The datasheet Pin Configurations diagram and MAX6854/MAX6856 Pin Description table confirm that Pin 1 has no circuit role. It should be left floating or tied to GND for mechanical stability and noise reduction, but must never be used as a signal or power path.
Can the MAX6856UK16D4+T operate with a supply voltage below 1.575V?
Yes, the MAX6856UK16D4+T operates down to VCC = +1.2V and guarantees valid RESET output down to +1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.575V, RESET remains asserted (low) until VCC rises above threshold and the 1200ms timeout expires. This ensures fail-safe behavior during deep brownout conditions.
What does the 'D4' suffix in MAX6856UK16D4+T indicate?
The 'D4' suffix in MAX6856UK16D4+T specifies the reset timeout period: 'D4' corresponds to a minimum 1200ms reset timeout, as defined in Table 4 (Reset Timeout Periods) of the datasheet. This is distinct from D1 (10ms), D2 (40ms), or D3 (150ms). The timeout begins after VCC exceeds 1.575V and MR is deasserted, ensuring sufficient hold time for slow-boot microcontrollers.
MAX6856UK16D4+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:
- 1.575V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6856UK16D4+T FAQ
1.How can I place an order for MAX6856UK16D4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6856UK16D4+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 MAX6856UK16D4+T reliable?
The price and inventory of MAX6856UK16D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6856UK16D4+T is usually 5 days.
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Once your MAX6856UK16D4+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 MAX6856UK16D4+T?
For technical support, including MAX6856UK16D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6856UK16D4+T requirements.
6.How does Aetrix verify that MAX6856UK16D4+T is sourced from the original manufacturer or authorized distributors?
All MAX6856UK16D4+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 MAX6856UK16D4+T meets industry standards.
7.What is the process for return or replacement of MAX6856UK16D4+T?
All MAX6856UK16D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6856UK16D4+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 MAX6856UK16D4+T part is unused and in its original packaging.
Return procedure for MAX6856UK16D4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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