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Analog Devices Inc./Maxim Integrated MAX6856UK26D3+T
- Part No.:
- MAX6856UK26D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6856UK26D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,323
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Product details
Overview
MAX6856UK26D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.625V reset threshold (suffix '26'), and 150ms minimum reset timeout (suffix 'D3'). It monitors VCC, provides manual reset input (MR), and asserts an active-low open-drain RESET output-designed for reliable power-on reset and brownout protection in battery-critical systems like glucose monitors and portable medical devices.
For engineers reviewing the MAX6856UK26D3+T datasheet, MAX6856UK26D3+T pinout, MAX6856UK26D3+T application, or MAX6856UK26D3+T equivalent, key selection considerations include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), open-drain output compatibility with mixed-voltage logic domains, and absence of external timing components.
Technical Context
The MAX6856UK26D3+T implements a precision voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C, coupled with a fixed 150ms (min) reset timeout timer that begins after VCC rises above 2.625V and MR deasserts. Its open-drain RESET output requires an external pullup and supports interfacing to logic supplies up to 5.5V independent of VCC.
It includes an internally pulled-up (10kΩ) active-low manual reset input (MR) with 1µs minimum pulse width and 200ns glitch rejection, enabling robust external reset initiation without debounce circuitry. The device lacks watchdog or CT functionality-confirmed by Selector Guide and Pin Description tables-making it a dedicated voltage-monitoring and manual-reset supervisory IC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V (factory-trimmed, ±2.5% tolerance); ensures deterministic reset assertion during 2.6V–2.7V supply brownout. |
| Supply Current | 170nA typical at +25°C; enables multi-year operation on coin-cell batteries in always-on portable medical devices. |
| Reset Timeout | 150ms minimum (D3 option); guarantees µP reset hold time sufficient for full power stabilization in low-power SoCs. |
| Reset Output Type | Active-low open-drain; allows level-shifting to higher logic rails (e.g., 3.3V/5V µP reset inputs) via external pullup. |
| VCC Operating Range | 1.2V to 5.5V; supports wide-input battery-powered systems including single Li-ion (3.0–4.2V) and dual alkaline (1.8–3.0V). |
| Reset Validity Limit | Guaranteed down to VCC = +1.1V; maintains valid reset assertion through deep brownout, preventing undefined µP state. |
| MR Input Pullup | 10kΩ internal resistor to VCC; eliminates need for external pullup when MR is unused or driven by open-drain logic. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-lead SOT-23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset output requiring external pullup; sinks current only when asserted; compatible with 0–5.5V logic domains. |
| 2 | GND | Ground reference for all internal circuits and reset timing; must be connected to system ground plane with low impedance. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS-level signals or momentary switch to GND. |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity and thermal dissipation in high-density layouts. |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF ceramic capacitor to GND for transient suppression and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell–powered wearables and patient monitors. |
| No external components | Integrated reset timer, voltage reference, and pullup eliminate BOM cost and board space for discrete RC networks. |
| VCC transient immunity | Immune to VCC glitches ≤40µs duration at 100mV overdrive-prevents spurious resets in noisy automotive or industrial environments. |
| Open-drain RESET flexibility | Supports mixed-voltage system reset coordination (e.g., 1.8V supervisor controlling 3.3V µP) without level translators. |
| Guaranteed 1.1V operation | Valid reset assertion down to VCC = +1.1V ensures deterministic behavior during deep undervoltage conditions. |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Glucose meters and patient monitors powered by CR2032 coin cells operating across temperature extremes (-20°C to +50°C). IC Role / Device Role / Timing Role: Voltage supervisor ensuring µP reset during battery discharge below 2.6V and during cold-start conditions. Use Value: 170nA ICC extends battery life beyond 5 years; 150ms reset timeout accommodates slow LDO startup in ultra-low-power analog front-ends. |
Use Scenario: Wireless environmental sensors deployed in remote locations with primary AA/AAA alkaline batteries. IC Role / Device Role / Timing Role: Brownout detector and manual reset interface for ARM Cortex-M0+ MCUs during intermittent solar charging cycles. Use Value: Open-drain RESET interfaces directly to 3.3V MCU reset pin while powered from 1.8–2.4V battery stack; no level shifter required. |
| Wearable Health Trackers | Low-Power Industrial Handhelds |
Use Scenario: Fitness bands using single-cell LiPo (2.7–4.2V) with aggressive sleep modes and wake-on-button functionality. IC Role / Device Role / Timing Role: Primary reset controller asserting clean reset on power-up and responding to user-initiated hard reset via MR switch. Use Value: Internal 10kΩ MR pullup eliminates external resistor; 200ns glitch rejection prevents false resets from ESD or button bounce. |
Use Scenario: Ruggedized barcode scanners with replaceable AA batteries and frequent hot-swap events. IC Role / Device Role / Timing Role: Supervisory guardrail ensuring µP remains held in reset until VCC stabilizes post-battery insertion. Use Value: Guaranteed reset validity to 1.1V prevents latch-up or corrupted firmware execution during marginal battery insertion. |
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; 1.6µA ICC (10× higher than MAX6856UK26D3+T). | Suitable for 3.3V systems where higher supply current is acceptable; lacks open-drain flexibility for mixed-voltage designs. | Select when system uses 3.3V VCC and requires push-pull drive without external pullup; avoid in coin-cell applications due to 10× higher ICC. |
| STM6315RWX6F | 2.63V threshold (±2%); 200ms timeout; open-drain RESET; 350nA ICC; operates down to 0.9V VCC. | Broader VCC range and tighter threshold tolerance; slightly higher ICC but still nanopower-class. | Prefer for designs requiring sub-1.1V reset validity or tighter threshold accuracy; verify MR compatibility (STM6315 uses active-high MR). |
Compared with TPS3836K33DBVR and STM6315RWX6F, the MAX6856UK26D3+T offers the lowest supply current (170nA) and exact 2.625V threshold matching legacy Maxim designs, while retaining open-drain flexibility critical for voltage-level translation in heterogeneous power domains.
Availability
MAX6856UK26D3+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, wearable health trackers, and low-power industrial handhelds requiring stable component supply with long-term lifecycle support.
Supply support for MAX6856UK26D3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX685x family was designed specifically for ultra-low-power microprocessor supervision in battery-constrained systems-emphasizing nanoscale ICC, precise voltage thresholds, and robust reset timing without external components.
FAQ
What is the exact reset threshold voltage of MAX6856UK26D3+T?
The MAX6856UK26D3+T has a factory-trimmed reset threshold of 2.625V, with ±2.5% tolerance over -40°C to +85°C. This value is confirmed by Table 2 (Threshold Suffix Guide) where suffix '26' corresponds to 2.625V (min 2.559V, typ 2.625V, max 2.691V). The threshold is referenced to the VCC pin and triggers reset assertion when VCC falls below this level.
Does MAX6856UK26D3+T include a watchdog timer function?
No, the MAX6856UK26D3+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, MAX6856 is explicitly listed without WDI (Watchdog Input) capability. Only MAX6864–MAX6869 variants include watchdog functionality; MAX6856 is a dedicated voltage monitor with manual reset (MR) and open-drain RESET output.
What is the function of Pin 4 on MAX6856UK26D3+T?
Pin 4 on MAX6856UK26D3+T is a second GND terminal, electrically connected to Pin 2 internally. Its inclusion improves thermal performance and reduces ground impedance in high-noise or high-current PCB layouts. Both GND pins must be connected to the same system ground plane for proper operation and specified electrical performance.
Can MAX6856UK26D3+T drive a 3.3V microcontroller reset input?
Yes, the MAX6856UK26D3+T can drive a 3.3V µP reset input using its open-drain RESET output (Pin 1). Connect an external pullup resistor from Pin 1 to the 3.3V supply rail. The device's RESET output sinks current only when asserted (low), and its leakage current is ≤25nA when deasserted-ensuring clean logic-level compatibility without additional level-shifting circuitry.
What is the minimum VCC required for guaranteed reset assertion in MAX6856UK26D3+T?
The MAX6856UK26D3+T guarantees valid reset assertion down to VCC = +1.1V, as stated in the Electrical Characteristics table under "Guaranteed Reset Valid to VCC = +1.1V". Below this voltage, RESET behavior is not specified; however, the device continues to assert RESET until VCC drops below the functional limit of its internal bandgap reference (~0.9V), though not guaranteed.
MAX6856UK26D3+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:
- 2.625V
- 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
MAX6856UK26D3+T FAQ
1.How can I place an order for MAX6856UK26D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6856UK26D3+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 MAX6856UK26D3+T reliable?
The price and inventory of MAX6856UK26D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6856UK26D3+T is usually 5 days.
3.What payment methods are accepted for MAX6856UK26D3+T?
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4.How is shipping managed for MAX6856UK26D3+T?
MAX6856UK26D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6856UK26D3+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 MAX6856UK26D3+T?
For technical support, including MAX6856UK26D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6856UK26D3+T requirements.
6.How does Aetrix verify that MAX6856UK26D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6856UK26D3+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 MAX6856UK26D3+T meets industry standards.
7.What is the process for return or replacement of MAX6856UK26D3+T?
All MAX6856UK26D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6856UK26D3+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 MAX6856UK26D3+T part is unused and in its original packaging.
Return procedure for MAX6856UK26D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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