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Analog Devices Inc./Maxim Integrated MAX6855UK40D1+T
- Part No.:
- MAX6855UK40D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK40D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,645
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Product details
Overview
The MAX6855UK40D1+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 4.000V reset threshold (±2.5%), and 10ms minimum reset timeout period. It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C - ideal for battery-powered glucose monitors and portable medical devices requiring reliable power-on reset under low-voltage brownout conditions.
For engineers reviewing the MAX6855UK40D1+T datasheet, MAX6855UK40D1+T pinout, MAX6855UK40D1+T application, or MAX6855UK40D1+T equivalent, this device delivers deterministic reset assertion down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), and no external components required - critical for space-constrained, ultra-low-power embedded systems.
Technical Context
The MAX6855UK40D1+T integrates voltage monitoring, manual reset initiation, and reset timing control in a single BiCMOS IC. Its reset logic asserts RESET high when VCC falls below 4.000V or MR is pulled low, holding the output asserted for ≥10ms after VCC recovers above threshold and MR deasserts.
It features an internal 10kΩ MR pullup, guaranteed RESET validity to VCC = +1.1V, and operates with supply voltages from 1.2V to 5.5V. The active-high push-pull output eliminates need for external pullup resistors and ensures clean logic-level compatibility with µP reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.000V ±2.5% - precisely triggers reset during 3.3V/5V system brownout without false trips |
| Supply Current (typ) | 170nA at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Reset Timeout Period | 10ms minimum - meets µP power-up initialization timing requirements for most ARM Cortex-M and PIC microcontrollers |
| Operating Voltage Range | 1.2V to 5.5V - supports Li-ion, alkaline, and regulated 3.3V/5V rails without external regulation |
| RESET Output Type | Active-high push-pull - drives µP reset pin directly without pullup resistor or level-shifting |
| VCC to RESET Delay | 40µs - ensures immediate reset assertion during fast VCC collapse (e.g., battery disconnect) |
| MR Input Glitch Rejection | 200ns - rejects EMI-induced noise on manual reset line in noisy industrial environments |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - sinks/source up to 1.2mA; directly interfaces µP reset pin |
| 2 | GND | Ground reference - must be connected to system ground plane for stable reset threshold accuracy |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 4 | GND | Second ground terminal - improves noise immunity; connect to same ground as Pin 2 |
| 5 | VCC | Supply voltage input - monitored for reset condition; bypass with 0.1µF ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC (170nA typ) | Extends battery life in portable medical devices beyond 5 years on CR2032 cells |
| Guaranteed RESET validity to VCC = +1.1V | Ensures controlled shutdown before µP enters undefined state during deep brownout |
| Immunity to short VCC transients | Rejects <40µs glitches at 100mV overdrive - prevents spurious resets in automotive or motor-drive environments |
| No external components required | Reduces BOM count and PCB area - ideal for compact wearable and implantable designs |
| Factory-trimmed reset threshold | Eliminates calibration overhead and production test time for 4.000V nominal rail monitoring |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission powered by single CR2032 cell. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; asserts active-high RESET to MSP430FR2355 MCU during battery voltage sag below 3.6V. Use Value: Prevents corrupted sensor readings or BLE packet loss during low-battery brownout by ensuring full µP reset before reinitialization. |
Use Scenario: Portable ECG recorder with rechargeable LiPo battery and analog front-end. IC Role / Device Role / Timing Role: Monitors 5.0V system rail; triggers 10ms RESET pulse on power-up and manual button press to initialize ADS1292R ADC and nRF52840 SoC. Use Value: Guarantees synchronized startup of analog and digital subsystems, eliminating race conditions in signal acquisition firmware. |
| Smart Wearables | Industrial Handheld Terminals |
Use Scenario: Fitness tracker with ambient light sensor, accelerometer, and NFC interface. IC Role / Device Role / Timing Role: Provides VCC supervision and MR-driven reset for Nordic nRF52833; operates from 1.8V–3.6V input range. Use Value: Enables reliable cold-start from storage voltage (≥1.2V) while consuming <0.2µA average current in sleep mode. |
Use Scenario: Rugged barcode scanner with 12V DC input, isolated 3.3V logic rail, and RS-232 interface. IC Role / Device Role / Timing Role: Supervises isolated 3.3V supply; MR tied to front-panel reset switch; RESET drives STM32L4 reset pin. Use Value: Survives 100V/ms load-dump transients on main rail due to internal transient immunity - no external TVS needed on supervisor supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.3V fixed threshold; 200ms reset timeout; 1.5µA ICC (typ); SOT23-5 | Designed for 3.3V systems only; longer timeout unsuitable for fast-boot µPs | Select when 3.3V rail monitoring and longer reset hold time are required; not drop-in for 4.0V threshold or 10ms timing. |
| MAX6361KA29D3+T | 2.93V threshold; 10ms timeout; 1.2µA ICC (typ); same SOT23-5 package | Higher supply current reduces battery lifetime in multi-year deployments | Use where lower threshold is acceptable and cost sensitivity outweighs nanopower advantage. |
Compared with TPS3837K33DBVR and MAX6361KA29D3+T, the MAX6855UK40D1+T uniquely combines 4.000V precision threshold, 10ms minimal timeout, and sub-200nA ICC - enabling longest battery life and tightest voltage-margin reset in 3.6V–4.2V lithium-based portable medical systems.
Availability
MAX6855UK40D1+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, smart wearables, and industrial handheld terminals requiring stable component supply with long-term lifecycle support.
Supply support for MAX6855UK40D1+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX685x family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanopower operation, factory-trimmed accuracy, and robust transient immunity without external components.
FAQ
What is the exact reset threshold voltage of the MAX6855UK40D1+T?
The MAX6855UK40D1+T has a factory-trimmed reset threshold of 4.000V 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 "40" corresponds to 4.000V nominal. The MAX6855UK40D1+T maintains this accuracy without external calibration or trimming components.
Does the MAX6855UK40D1+T include a watchdog timer function?
No, the MAX6855UK40D1+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input and watchdog timeout functionality. The MAX6855UK40D1+T provides voltage monitoring, manual reset input (MR), and fixed 10ms reset timeout - no watchdog circuitry is integrated.
What is the RESET output configuration of the MAX6855UK40D1+T?
The MAX6855UK40D1+T features an active-high push-pull RESET output (Pin 1), as specified in the MAX6854/MAX6855/MAX6856 Pin Description table. Unlike open-drain variants, it sources and sinks current directly - eliminating need for external pullup resistors and ensuring clean logic transitions into µP reset pins.
Can the MAX6855UK40D1+T operate reliably below 1.8V supply voltage?
Yes, the MAX6855UK40D1+T operates from 1.2V to 5.5V and guarantees valid RESET output down to VCC = +1.1V. Electrical Characteristics confirm functional operation at 1.2V minimum, with 170nA typical supply current at 1.8V and 190nA at 1.2V - making it suitable for deep brownout supervision in lithium primary and energy-harvesting systems.
Is the MAX6855UK40D1+T pin-compatible with other devices in the MAX685x family?
The MAX6855UK40D1+T shares the same 5-pin SOT23-5 package and pinout (RESET, GND, MR, GND, VCC) with MAX6854 and MAX6856 variants. However, pin compatibility does not imply functional equivalence: MAX6854 offers active-low push-pull RESET, MAX6856 offers open-drain RESET, while MAX6855UK40D1+T provides active-high push-pull - requiring schematic review before substitution.
MAX6855UK40D1+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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK40D1+T FAQ
1.How can I place an order for MAX6855UK40D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK40D1+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 MAX6855UK40D1+T reliable?
The price and inventory of MAX6855UK40D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK40D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK40D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK40D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK40D1+T?
MAX6855UK40D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK40D1+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 MAX6855UK40D1+T?
For technical support, including MAX6855UK40D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK40D1+T requirements.
6.How does Aetrix verify that MAX6855UK40D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK40D1+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 MAX6855UK40D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK40D1+T?
All MAX6855UK40D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK40D1+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 MAX6855UK40D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK40D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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