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Analog Devices Inc./Maxim Integrated MAX6855UK27D1+T
- Part No.:
- MAX6855UK27D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK27D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,912
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Product details
Overview
The MAX6855UK27D1+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing active-high push-pull reset output, manual reset input (MR), and factory-trimmed 2.7V reset threshold with 10ms minimum reset timeout. It monitors VCC supply integrity, asserts reset during power-up/brownout, and guarantees valid reset operation down to VCC = +1.1V. Designed for ultra-low-power portable systems such as glucose monitors and MP3 players.
For engineers reviewing the MAX6855UK27D1+T datasheet, MAX6855UK27D1+T pinout, MAX6855UK27D1+T application, or MAX6855UK27D1+T equivalent, this page delivers verified electrical parameters, exact pin functions, confirmed reset timing behavior, and validated alternative options for battery-powered µP supervision where sub-200nA quiescent current and guaranteed 1.1V reset validity are critical selection criteria.
Technical Context
The MAX6855UK27D1+T implements a precision voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, coupled with a fixed 10ms reset timeout period after VCC recovery or MR deassertion. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load when asserted.
It features an internally pulled-up MR input (10kΩ to VCC) with 1µs minimum pulse width requirement and 250ns MR-to-reset delay. Immune to short VCC transients (e.g., ≤40µs at 100mV overdrive), it operates across 1.2V–5.5V supply range while drawing only 170nA typical supply current at 2.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.7V ±2.5% - factory-trimmed voltage at which reset asserts on VCC fall; enables precise brownout detection for 2.8V/3.0V systems. |
| Supply Current | 170nA typ at 2.5V - enables multi-year battery life in always-on medical and portable devices without compromising supervision reliability. |
| Reset Timeout | 10ms min - ensures µP reset signal remains asserted long enough for full core initialization before release. |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup; drives high to VCC when deasserted, low to ≤0.3V when asserted. |
| VCC Validity Range | 1.1V to 5.5V - guarantees functional reset assertion even during deep brownout, critical for Li-ion battery discharge profiles. |
| MR Input Behavior | Active-low with 10kΩ internal pullup - supports direct CMOS logic drive or momentary switch to GND; no external components required. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - transitions high when VCC drops below 2.7V or MR is pulled low; remains high for 10ms after recovery. |
| 2 | GND | Ground reference - must be connected to system common ground; all internal circuitry referenced to this node. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; asserting low initiates reset independent of VCC level. |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity and thermal dissipation in SOT23 layout. |
| 5 | VCC | Supply voltage input - monitored for reset condition; bypass with 0.1µF capacitor to GND for noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - reduces battery drain by >99% vs. standard supervisors, enabling decade-scale operation in coin-cell devices. |
| Guaranteed reset validity to 1.1V | Ensures reliable reset assertion even as Li-ion voltage falls below 2.0V, preventing undefined µP states during deep discharge. |
| No external components required | Integrates MR pullup, precision voltage reference, and timeout timer - eliminates BOM cost and PCB area for discrete support parts. |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - prevents spurious resets in noisy DC-DC converter or RF-coupled environments. |
| Push-pull active-high RESET | Drives rail-to-rail without pullup resistor - simplifies interface to µP reset inputs expecting active-high assertion (e.g., ARM Cortex-M series). |
Applications
| Glucose Monitors | MP3 Players |
|---|---|
|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 1.8V MCU supply during battery discharge; asserts active-high reset if VCC dips below 2.7V during RF burst transmission. Use Value: Prevents firmware lockup during intermittent low-VCC events, ensuring sensor data integrity and FDA-compliant fault recovery. |
Use Scenario: Portable audio playback with flash memory storage and headphone amplifier, powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Monitors 3.3V system rail; triggers 10ms active-high reset on startup to synchronize codec, DAC, and µP initialization sequences. Use Value: Eliminates boot failures caused by marginal power sequencing, improving first-time power-on success rate to >99.99%. |
| Patient Monitors | Smart Pagers |
|
Use Scenario: Multi-parameter bedside monitor with ECG, SpO₂, and NIBP modules operating on backup battery during AC failure. IC Role / Device Role / Timing Role: Provides fail-safe reset supervision for dual-rail (1.2V/3.3V) SoC; asserts reset if main 3.3V rail collapses below 2.7V during switchover. Use Value: Meets IEC 60601-1 essential performance requirements for uninterrupted alarm functionality during power transitions. |
Use Scenario: Two-way messaging device with persistent memory and low-duty-cycle RF receiver, powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 2.8V LDO output feeding baseband processor; uses 170nA ICC to extend battery life beyond 5 years in standby. Use Value: Enables maintenance-free operation in remote asset tracking deployments without field battery replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K27DBVR | 2.7V reset threshold, 200ms timeout, open-drain active-low output, 2.5µA ICC | Requires external pullup; higher current draw limits use in <5-year battery applications | Select when longer timeout or legacy active-low reset interface is required; not drop-in due to output polarity and timing. |
| MAX6315US27D3+ | 2.7V threshold, 10ms timeout, active-low open-drain, 1.6µA ICC, SOT23-5 | Higher supply current and active-low output necessitate schematic changes for µP reset pin compatibility | Choose for cost-sensitive designs where 1.6µA ICC is acceptable and µP accepts active-low reset; not pin-compatible. |
Compared with TPS3837K27DBVR and MAX6315US27D3+, the MAX6855UK27D1+T uniquely delivers active-high push-pull output, 170nA current, and guaranteed 1.1V operation - enabling direct µP interface and decade-scale battery life without layout or firmware adaptation.
Availability
MAX6855UK27D1+T is available at Aetrix Electronics and suitable for glucose monitors, MP3 players, and patient monitors requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6855UK27D1+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 portable applications.
The MAX685x family was designed specifically for nanopower microprocessor supervision in battery-critical systems, emphasizing ultra-low ICC, wide VCC operating range, and robust transient immunity without external components.
FAQ
What is the exact reset threshold voltage of the MAX6855UK27D1+T?
The MAX6855UK27D1+T has a factory-trimmed reset threshold of 2.7V, with guaranteed tolerance of ±2.5% 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 "27" corresponds to 2.7V nominal. The MAX6855UK27D1+T maintains this accuracy without calibration or external components.
Does the MAX6855UK27D1+T include a watchdog timer function?
No, the MAX6855UK27D1+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants integrate WDI functionality. The MAX6855UK27D1+T provides voltage monitoring, manual reset input (MR), and fixed 10ms reset timeout - making it a dedicated supervisor without watchdog capability.
What is the reset output configuration of the MAX6855UK27D1+T?
The MAX6855UK27D1+T features an active-high push-pull reset output (RESET). As documented in the MAX6854/MAX6855/MAX6856 Pin Description table, Pin 1 is labeled RESET and functions as an active-high output referenced to VCC. It drives high when deasserted and low (≤0.3V at 1.2mA) when asserted - eliminating need for external pullup resistors.
Can the MAX6855UK27D1+T operate reliably below 1.8V supply voltage?
Yes, the MAX6855UK27D1+T is fully specified to operate down to VCC = +1.1V, with guaranteed reset assertion validity across that range. Electrical Characteristics confirm supply voltage range of 1.2V to 5.5V, and the "Guaranteed Reset Valid to VCC = +1.1V" feature explicitly supports use in deep-brownout scenarios common in single-cell Li-ion and coin-cell applications.
What is the minimum pulse width required on the MR input of the MAX6855UK27D1+T?
The MR input of the MAX6855UK27D1+T requires a minimum pulse width of 1µs to reliably trigger a reset, as specified in the Electrical Characteristics table under "MR Minimum Pulse Width (tMPW)". This short requirement allows compatibility with fast digital logic and debounced mechanical switches without additional timing circuitry.
MAX6855UK27D1+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:
- 2.7V
- 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
MAX6855UK27D1+T FAQ
1.How can I place an order for MAX6855UK27D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK27D1+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 MAX6855UK27D1+T reliable?
The price and inventory of MAX6855UK27D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK27D1+T is usually 5 days.
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MAX6855UK27D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK27D1+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 MAX6855UK27D1+T?
For technical support, including MAX6855UK27D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK27D1+T requirements.
6.How does Aetrix verify that MAX6855UK27D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK27D1+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 MAX6855UK27D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK27D1+T?
All MAX6855UK27D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK27D1+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 MAX6855UK27D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK27D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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