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Analog Devices Inc./Maxim Integrated MAX6855UK27D2+T
- Part No.:
- MAX6855UK27D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK27D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,232
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Product details
Overview
The MAX6855UK27D2+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 2.7V reset threshold (±2.5%), and 40ms minimum reset timeout period. It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C for reliable power-up/brownout monitoring in battery-powered systems.
For engineers reviewing the MAX6855UK27D2+T datasheet, MAX6855UK27D2+T pinout, MAX6855UK27D2+T application, or MAX6855UK27D2+T equivalent, this device serves as a low-quiescent-current voltage monitor with deterministic reset timing, MR-initiated recovery, and guaranteed RESET validity down to VCC = +1.1V - critical for portable medical and consumer electronics design validation.
Technical Context
This supervisory IC integrates a precision voltage comparator with hysteresis (0.5% VTH), a monostable reset timeout generator, and an internal 10kΩ MR pullup. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load while sourcing ≥0.8×VCC when deasserted.
The device asserts RESET when VCC falls below 2.7V (typ), MR is pulled low, or (in watchdog variants) WDI stalls - but MAX6855UK27D2+T excludes watchdog functionality. Reset remains asserted for ≥40ms after VCC rises above threshold and MR releases, with immunity to ≤40µs VCC transients at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V; enables multi-year battery life in always-on devices |
| Reset Threshold | 2.7V ±2.5%; factory-trimmed for precise brownout detection without external resistors |
| Reset Timeout | 40ms min (D2 option); ensures µP completes power stabilization before release |
| RESET Output Type | Active-high push-pull; eliminates need for external pullup and supports direct µP reset input |
| VCC Operating Range | 1.2V to 5.5V; valid RESET assertion guaranteed down to VCC = 1.1V for deep brownout coverage |
| MR Input Logic | Active-low with 10kΩ internal pullup; accepts CMOS levels and requires no external bias |
| Temperature Range | -40°C to +85°C; qualified for industrial and portable medical equipment environments |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives µP reset pin directly without pullup resistor |
| 2 | GND | Ground reference for all internal circuitry and reset timing accuracy |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ), accepts open-drain logic |
| 4 | GND | Second ground connection; improves noise immunity and thermal dissipation |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in glucose monitors and wearables |
| No external components | Factory-trimmed threshold and fixed timeout eliminate calibration resistors and capacitors |
| VCC transient immunity | Immune to ≤40µs supply glitches at 100mV overdrive, reducing false resets in noisy environments |
| Guaranteed RESET validity | RESET remains functional down to VCC = +1.1V, ensuring robust operation during deep brownouts |
| MR glitch rejection | 200ns minimum pulse rejection prevents accidental reset from EMI or switch bounce |
Applications
| Portable Medical Devices | Wearable Health Monitors |
|---|---|
Use Scenario: Glucose meters and patient monitors operating from coin-cell batteries with infrequent wake-ups. IC Role / Device Role / Timing Role: Supervises VCC during cold-start and battery depletion; asserts active-high RESET to hold µP in reset until stable 3.3V rail is established. Use Value: 170nA quiescent current enables >5-year shelf life; 2.7V threshold matches LiMnO₂ cell discharge profile. |
Use Scenario: Fitness trackers with motion-triggered wake-up and intermittent BLE transmission. IC Role / Device Role / Timing Role: Provides deterministic 40ms reset hold-off after power-on, ensuring sensor initialization completes before firmware execution. Use Value: Push-pull active-high RESET eliminates external pullup, saving PCB area and BOM cost in space-constrained designs. |
| Industrial Handheld Terminals | Low-Power IoT Sensors |
Use Scenario: Ruggedized barcode scanners powered by rechargeable Li-ion packs subject to voltage sag under load. IC Role / Device Role / Timing Role: Monitors main 3.3V rail; asserts RESET on drop below 2.7V and holds for ≥40ms to prevent corrupted EEPROM writes. Use Value: Guaranteed RESET validity to VCC = 1.1V prevents latch-up during rapid discharge events. |
Use Scenario: Soil moisture sensors deployed in remote locations, powered by solar-charged supercapacitors. IC Role / Device Role / Timing Role: Acts as power-good indicator and brownout protector; MR pin enables remote firmware recovery via GPIO. Use Value: Internal 10kΩ MR pullup simplifies host µC interface; no external biasing required for momentary switch or logic control. |
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 threshold, 200ms timeout, open-drain RESET, 1.5µA ICC | Requires external pullup; higher ICC reduces battery lifetime in multi-year deployments | Select if open-drain interface or longer timeout is needed; verify µP reset pin compatibility |
| MAX6369KA27+T | 2.7V threshold, 140ms timeout, push-pull active-low RESET, 800nA ICC | Active-low output conflicts with µPs requiring active-high reset; higher ICC than MAX6855UK27D2+T | Choose only if legacy board uses active-low reset signaling and 800nA is acceptable |
Compared with TPS3837K27DBVR and MAX6369KA27+T, the MAX6855UK27D2+T delivers the lowest supply current (170nA vs. 1.5µA/800nA) and native active-high push-pull RESET - eliminating pullup components and maximizing battery runtime in space-constrained portable designs.
Availability
MAX6855UK27D2+T is available at Aetrix Electronics and suitable for portable medical devices, wearable health monitors, industrial handheld terminals, and low-power IoT sensors requiring stable component supply with long-term lifecycle support.
Supply support for MAX6855UK27D2+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 power management, sensing, and connectivity in demanding industrial and medical applications.
The MAX6855UK27D2+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for ultra-low-current voltage monitoring and deterministic reset control in battery-critical portable electronics.
FAQ
What is the reset threshold voltage of the MAX6855UK27D2+T?
The MAX6855UK27D2+T has a factory-trimmed reset threshold of 2.7V with ±2.5% tolerance over temperature. This value is encoded in the "27" suffix per Maxim's Threshold Suffix Guide and is verified across -40°C to +85°C. The device asserts its active-high RESET output when VCC falls below this threshold and holds it for ≥40ms after VCC recovers.
Does the MAX6855UK27D2+T include a watchdog timer function?
No, the MAX6855UK27D2+T does not include a watchdog timer. It is a manual-reset-only supervisory circuit. Watchdog functionality is present only in MAX6864–MAX6869 variants (e.g., MAX6864UK27D2S+T), identifiable by the "S" or "L" suffix in the part number. The MAX6855UK27D2+T provides voltage monitoring and MR-initiated reset only.
What is the function of Pin 1 on the MAX6855UK27D2+T?
Pin 1 of the MAX6855UK27D2+T is the RESET output, configured as an active-high push-pull driver. When asserted, it drives high (≥0.8×VCC) to signal reset condition to the microprocessor; when deasserted, it drives low (≤0.3V at 1.2mA). This eliminates the need for an external pullup resistor and ensures fast, clean reset signaling.
Can the MAX6855UK27D2+T operate with a 1.8V supply rail?
Yes, the MAX6855UK27D2+T operates across VCC = 1.2V to 5.5V and guarantees valid RESET assertion down to VCC = +1.1V. At 1.8V, its typical supply current is 170nA, and RESET output meets VOH ≥0.8×VCC and VOL ≤0.3V specifications - making it suitable for modern low-voltage µPs and SoCs.
How is the reset timeout period determined for the MAX6855UK27D2+T?
The reset timeout period for the MAX6855UK27D2+T is fixed at 40ms minimum (D2 option), encoded in the "D2" portion of the part number. This timeout begins when VCC rises above 2.7V or MR is released, and ensures the microprocessor remains held in reset long enough for power rails and clocks to stabilize before firmware execution resumes.
MAX6855UK27D2+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:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK27D2+T FAQ
1.How can I place an order for MAX6855UK27D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK27D2+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 MAX6855UK27D2+T reliable?
The price and inventory of MAX6855UK27D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK27D2+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK27D2+T?
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Once your MAX6855UK27D2+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 MAX6855UK27D2+T?
For technical support, including MAX6855UK27D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK27D2+T requirements.
6.How does Aetrix verify that MAX6855UK27D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK27D2+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 MAX6855UK27D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK27D2+T?
All MAX6855UK27D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK27D2+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 MAX6855UK27D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK27D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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