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Analog Devices Inc./Maxim Integrated MAX6856UK23D3+
- Part No.:
- MAX6856UK23D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6856UK23D3+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:623
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Product details
Overview
The MAX6856UK23D3+ from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and fixed 150ms minimum reset timeout. It asserts an active-low open-drain RESET output when VCC drops below 2.313V (typ), MR is pulled low, or during power-up/brownout - ensuring reliable µP initialization in battery-powered systems.
For engineers reviewing the MAX6856UK23D3+ datasheet, MAX6856UK23D3+ pinout, MAX6856UK23D3+ application, or MAX6856UK23D3+ equivalent, this device is selected for ultra-low-current (170nA typ) reset supervision where supply voltage stability, glitch immunity, and minimal board space are critical - especially in portable medical and handheld electronics requiring guaranteed reset validity down to VCC = +1.1V.
Technical Context
This device implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over temperature and a dedicated internal timer for fixed 150ms (min) reset assertion after VCC recovery or MR release. Its open-drain RESET output requires an external pullup and supports logic-level interfacing across 0–5.5V domains.
The MAX6856UK23D3+ lacks watchdog timer (WDI) and CT select inputs - distinguishing it from MAX6864–MAX6869 and MAX6861–MAX6863 variants. It features internal 10kΩ MR pullup, 40µs VCC transient immunity at 100mV overdrive, and guaranteed operation from –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.255V (min) / 2.313V (typ) / 2.371V (max) - factory-trimmed for precise brownout detection at 2.3V nominal supply rails |
| Reset Timeout Period | 150ms (min) / 225ms (typ) / 300ms (max) - ensures µP reset hold time exceeds boot sequence requirements |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in always-on portable devices |
| Operating Voltage Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail embedded systems |
| Reset Output Type | Active-low open-drain - allows level-shifting and wired-OR reset bus configurations |
| VCC Immunity Threshold | Valid reset assertion guaranteed down to VCC = +1.1V - maintains system reliability during deep brownout |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC - eliminates external biasing for pushbutton manual reset |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (indicated by '+' suffix), footprint-compatible with industry-standard 5-pin supervisory ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output - requires external pullup; sinks current only when asserted |
| 2 | GND | Ground reference - must be connected to system common ground plane for accurate threshold sensing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; driven low to force reset independent of VCC |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in high-frequency layouts |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypassed with 0.1µF capacitor to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell–powered glucose monitors |
| Open-drain RESET | Supports mixed-voltage reset buses and logic-level translation without additional level shifters |
| Guaranteed VCC = +1.1V operation | Ensures deterministic reset behavior during deep undervoltage events before µP functional collapse |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments |
| No external components required | Integrates MR pullup, voltage reference, and timing capacitor - reduces BOM count and PCB area |
Applications
| Portable Medical Devices | Handheld Industrial Scanners |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 14 days on single CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 2.3V LDO output to ensure µP reset during battery sag or cold-temperature discharge. Use Value: 170nA ICC extends usable battery life by >25% versus legacy supervisors; 150ms timeout accommodates slow analog sensor wake-up. |
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion, subjected to ESD and motor-induced supply noise. IC Role / Device Role / Timing Role: Provides glitch-immune reset supervision for ARM Cortex-M0 host MCU during battery insertion and motor startup transients. Use Value: 40µs transient rejection prevents false resets; open-drain output interfaces directly to 3.3V µP reset pin while powered from 2.3V rail. |
| Wearable Fitness Trackers | Low-Power IoT Edge Sensors |
|
Use Scenario: Always-on wrist-worn tracker with heart-rate sensor, BLE radio, and 100mAh LiPo battery. IC Role / Device Role / Timing Role: Monitors 2.3V system rail and initiates controlled reboot upon voltage dip during BLE transmission bursts. Use Value: Factory-trimmed 2.313V threshold matches LDO dropout spec; 150ms timeout exceeds BLE stack initialization latency. |
Use Scenario: Battery-operated soil moisture sensor node deployed outdoors for 5+ years without maintenance. IC Role / Device Role / Timing Role: Supervises 2.3V buck converter output feeding ultra-low-power MSP430 MCU and LoRa transceiver. Use Value: Valid operation down to VCC = +1.1V ensures reset assertion even as battery depletes to 1.8V open-circuit; 170nA ICC minimizes self-discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3838K23DBVR | 2.32V reset threshold, 200ms timeout, push-pull active-low RESET, 1.8µA ICC (typ) | Higher supply current limits use in >5-year battery applications; push-pull output requires matching VCC domain | Select when board already uses TI-supplied 2.3V supervisors and push-pull drive is preferred over open-drain flexibility |
| ADM6806-23ARTZ-R7 | 2.32V threshold, 200ms timeout, open-drain RESET, 600nA ICC (typ), -40°C to +125°C rating | Higher ICC than MAX6856UK23D3+, wider temp range suits under-hood automotive but over-spec for portable medical | Choose for extended temperature operation where 600nA ICC remains acceptable, e.g., industrial gateways with thermal management |
Compared with TPS3838K23DBVR and ADM6806-23ARTZ-R7, the MAX6856UK23D3+ delivers the lowest ICC (170nA) and optimal balance of threshold accuracy, timeout duration, and open-drain flexibility for long-life portable electronics - without requiring higher quiescent current or over-specified temperature range.
Availability
MAX6856UK23D3+ is available at Aetrix Electronics and suitable for portable medical devices, handheld industrial scanners, wearable fitness trackers, and low-power IoT edge sensors requiring stable component supply across multi-year production cycles.
Supply support for MAX6856UK23D3+ 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 demanding industrial, medical, and communications systems.
The MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in space-constrained, battery-critical applications - emphasizing ultra-low ICC, guaranteed low-VCC operation, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6856UK23D3+?
The MAX6856UK23D3+ has a factory-trimmed reset threshold of 2.255V (min), 2.313V (typ), and 2.371V (max) at TA = –40°C to +85°C. This 2.3V nominal threshold is optimized for supervision of 2.3V LDO outputs in portable medical and wearable devices, with ±2.5% tolerance maintained across temperature and supply voltage.
Does the MAX6856UK23D3+ include a watchdog timer function?
No, the MAX6856UK23D3+ does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides voltage monitoring and manual reset only. Watchdog functionality is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK23D3S+), identifiable by the 'S' or 'L' suffix in the ordering code.
What is the purpose of the dual GND pins (Pins 2 and 4) on the MAX6856UK23D3+?
Pins 2 and 4 on the MAX6856UK23D3+ are both connected to internal ground. This dual-GND configuration improves noise immunity and thermal dissipation in the 5-pin SOT23 package. Layout best practice recommends connecting both pins directly to the same low-impedance ground plane to minimize ground bounce during reset assertion.
Can the MAX6856UK23D3+ operate reliably below 1.8V supply voltage?
Yes, the MAX6856UK23D3+ is fully specified from VCC = 1.2V to 5.5V and guarantees valid reset assertion down to VCC = +1.1V. At 1.2V, its 170nA typical supply current and 2.313V threshold remain functional - enabling use with aging batteries or low-dropout regulators in deep brownout conditions.
Is the MAX6856UK23D3+ pin-compatible with other SOT23-5 supervisors like the TPS3836 series?
Yes, the MAX6856UK23D3+ is pin-compatible with the TPS3836/TPS3837/TPS3838 family per Maxim's documentation. Pin 1 (RESET), Pin 2 (GND), Pin 3 (MR), Pin 4 (GND), and Pin 5 (VCC) match the standard SOT23-5 supervisory layout - allowing drop-in replacement where open-drain output and 2.3V threshold are acceptable.
MAX6856UK23D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- 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
MAX6856UK23D3+ FAQ
1.How can I place an order for MAX6856UK23D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6856UK23D3+ 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 MAX6856UK23D3+ reliable?
The price and inventory of MAX6856UK23D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6856UK23D3+ is usually 5 days.
3.What payment methods are accepted for MAX6856UK23D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6856UK23D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6856UK23D3+?
MAX6856UK23D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6856UK23D3+ 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 MAX6856UK23D3+?
For technical support, including MAX6856UK23D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6856UK23D3+ requirements.
6.How does Aetrix verify that MAX6856UK23D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6856UK23D3+ 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 MAX6856UK23D3+ meets industry standards.
7.What is the process for return or replacement of MAX6856UK23D3+?
All MAX6856UK23D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6856UK23D3+, 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 MAX6856UK23D3+ part is unused and in its original packaging.
Return procedure for MAX6856UK23D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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