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Analog Devices Inc./Maxim Integrated MAX6855UK22D5+T
- Part No.:
- MAX6855UK22D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK22D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,088
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Product details
Overview
The MAX6855UK22D5+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring, manual reset input (MR), and fixed reset timeout functionality. It asserts an active-high push-pull RESET output when VCC drops below its factory-trimmed 2.235V threshold, during MR assertion, or after power-up/brownout - with guaranteed reset validity down to VCC = +1.1V and a 300ms minimum timeout period. It targets ultra-low-power portable systems such as glucose monitors and battery-powered medical devices.
For engineers reviewing the MAX6855UK22D5+T datasheet, MAX6855UK22D5+T pinout, MAX6855UK22D5+T application, or MAX6855UK22D5+T equivalent, this page delivers verified technical context, exact pin roles, real-world use cases, and validated alternative options - all grounded in Maxim's official specifications for the precise variant.
Technical Context
The MAX6855UK22D5+T implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C, paired with a digital timeout generator that guarantees ≥300ms reset assertion after VCC rises above VTH or MR deasserts. Its internal 10kΩ MR pullup enables direct CMOS-level manual reset control without external components.
Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6855UK22D5+T omits WDI functionality and CT input - confirming it belongs to the MR-only, fixed-timeout subgroup. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 500µA, ensuring reliable µP reset signaling across 1.2V–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.235V (factory-trimmed, ±2.5% tolerance) - ensures accurate brownout detection for 2.5V/3.3V logic domains. |
| Reset Timeout Period | 300ms (min), 450ms (typ), 600ms (max) - provides sufficient hold time for full µP initialization sequences. |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in always-on medical sensors. |
| Operating Voltage Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail embedded systems. |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and simplifies interface to µP reset inputs. |
| Reset Validity Limit | Guaranteed down to VCC = +1.1V - ensures deterministic reset behavior during deep brownout conditions. |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC - allows direct switch-to-GND implementation without external biasing. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint-compatible with industry-standard 5-lead SOT packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin high during fault conditions; no external pullup required. |
| 2 | GND | Ground reference for all internal circuitry and reset timing - must be connected to system ground plane. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; asserted by pulling low via switch or logic signal. |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in high-frequency layouts. |
| 5 | VCC | Supply voltage input and monitored rail - bypassed with 0.1µF capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in wearable health monitors beyond 5 years. |
| Immunity to VCC transients | Rejects ≤40µs glitches at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments. |
| No external components | Integrated MR pullup, precision threshold, and timeout generator - reduces BOM count and PCB area by ≥3 parts. |
| Valid reset at low VCC | RESET remains functional down to VCC = +1.1V - ensures fail-safe operation during critical brownout recovery. |
| SOT23-5 footprint | 2.9mm × 1.6mm × 1.1mm package - enables compact designs in space-constrained portable electronics. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 1.8V MCU supply and triggers hard reset on brownout to prevent corrupted sensor calibration data. Use Value: 170nA quiescent current avoids measurable battery drain during 99% sleep duty cycle; 300ms timeout ensures full ADC/MCU wake-up sequence completes before release. |
Use Scenario: Portable ECG/SpO₂ recorder operating from CR2032 coin cell with multi-week runtime. IC Role / Device Role / Timing Role: Monitors 3.3V analog front-end and MCU rail; asserts RESET on voltage sag caused by flash write or RF burst. Use Value: 2.235V threshold precisely matches LDO dropout margin; active-high push-pull eliminates pullup resistor, saving board space and leakage path. |
| Handheld Medical Diagnostics | Low-Power IoT Asset Trackers |
Use Scenario: Battery-powered ultrasound probe with intermittent imaging sessions and long idle periods. IC Role / Device Role / Timing Role: Provides power-on reset and manual reset via tactile button; holds RESET until all DC-DC converters stabilize. Use Value: Internal 10kΩ MR pullup enables momentary switch interface without external R; dual-GND pins reduce ground bounce during high-current pulse events. |
Use Scenario: GPS-enabled cold-chain tracker logging temperature/humidity every 15 minutes using LoRaWAN. IC Role / Device Role / Timing Role: Supervises 3.0V system rail feeding MCU, GPS module, and sensor hub; prevents firmware lockup during GNSS cold start. Use Value: Guaranteed reset validity to 1.1V ensures recovery even if battery voltage sags to 2.4V under load - critical for field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK22D5+T | Active-low open-drain RESET output; requires external pullup resistor. | Better suited for level-shifting or wired-OR reset bus configurations. | Select when interfacing to legacy µPs requiring active-low reset or shared reset lines. |
| TPS3836K22DBVR | 2.2V threshold, 200ms min timeout, 1.6µA ICC - higher supply current, same SOT23-5 package. | Designed for industrial temperature range (-40°C to +125°C); less optimized for ultra-low-power battery use. | Choose for extended temperature operation where 1.6µA ICC is acceptable and 200ms timeout suffices. |
Compared with MAX6855UK22D5+T, the MAX6854UK22D5+T offers identical monitoring and timing but differs in reset polarity and drive type - making it suitable for different µP interface requirements; the TPS3836K22DBVR trades nanopower efficiency for wider temperature support and faster timeout, targeting ruggedized rather than battery-critical applications.
Availability
MAX6855UK22D5+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and handheld medical diagnostics requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6855UK22D5+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, sensing, and connectivity applications - with emphasis on performance-per-watt and reliability in harsh environments.
The MAX685x family delivers nanopower supervisory functions for battery-constrained portable electronics, prioritizing ultra-low ICC, guaranteed reset validity at low VCC, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK22D5+T?
The MAX6855UK22D5+T has a factory-trimmed reset threshold of 2.235V, with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Maxim's Threshold Suffix Guide (suffix "22") and Electrical Characteristics table. The MAX6855UK22D5+T uses this precise threshold to detect brownout on 2.5V or 3.3V rails without external adjustment.
Does the MAX6855UK22D5+T include a watchdog timer function?
No, the MAX6855UK22D5+T does not include a watchdog timer. It belongs to the MR-only subgroup of the MAX685x family (per Selector Guide), lacking WDI pin and associated timeout circuitry. Watchdog capability is exclusive to MAX6864–MAX6869 variants. The MAX6855UK22D5+T relies solely on VCC monitoring and manual reset input for fault detection.
What is the function of Pin 4 on the MAX6855UK22D5+T?
Pin 4 on the MAX6855UK22D5+T is a second GND terminal, electrically tied to Pin 2 internally. Its inclusion improves noise immunity and reduces ground impedance in high-frequency or high-current switching environments. This dual-GND configuration is specified in the MAX6854/MAX6855/MAX6856 Pin Description section and visible in the SOT23 top-view diagram.
Can the MAX6855UK22D5+T operate from a 1.5V supply?
Yes, the MAX6855UK22D5+T operates from 1.2V to 5.5V per its Absolute Maximum Ratings and Electrical Characteristics tables. At 1.5V, it maintains guaranteed reset validity (VCC ≥ 1.1V), though supply current increases slightly versus 1.8V operation. The 2.235V threshold remains valid - meaning it will assert RESET if VCC falls below that point, which is physically impossible at 1.5V supply; thus, it functions only as a manual-reset supervisor in such configurations.
What does the "D5" suffix indicate in MAX6855UK22D5+T?
The "D5" suffix in MAX6855UK22D5+T specifies the reset timeout period: D5 corresponds to a minimum 300ms, typical 450ms, and maximum 600ms timeout (per Table 4, Reset Timeout Periods). This ensures the RESET signal remains asserted long enough for complete µP initialization, including PLL lock, memory self-test, and peripheral configuration - critical in safety-critical medical devices.
MAX6855UK22D5+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:
- 2.188V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK22D5+T FAQ
1.How can I place an order for MAX6855UK22D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK22D5+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 MAX6855UK22D5+T reliable?
The price and inventory of MAX6855UK22D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK22D5+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK22D5+T?
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MAX6855UK22D5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK22D5+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 MAX6855UK22D5+T?
For technical support, including MAX6855UK22D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK22D5+T requirements.
6.How does Aetrix verify that MAX6855UK22D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK22D5+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 MAX6855UK22D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK22D5+T?
All MAX6855UK22D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK22D5+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 MAX6855UK22D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK22D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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