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Analog Devices Inc./Maxim Integrated MAX6855UK36D6+T
- Part No.:
- MAX6855UK36D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK36D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,499
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Product details
Overview
The MAX6855UK36D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and factory-trimmed 3.600V reset threshold with 1200ms minimum reset timeout period. It monitors VCC supply voltage, asserts reset during brownout or manual trigger, and guarantees valid reset operation down to VCC = +1.1V. It is designed for ultra-low-power portable systems such as glucose monitors and battery-powered medical devices.
For engineers reviewing the MAX6855UK36D6+T datasheet, MAX6855UK36D6+T pinout, MAX6855UK36D6+T application, or MAX6855UK36D6+T equivalent, key selection criteria include its 170nA typical supply current, 3.600V ±2.5% reset threshold, 1200ms reset timeout, MR input with 10kΩ internal pullup, and guaranteed reset validity at VCC ≥ 1.1V - all critical for reliable power-on initialization and brownout recovery in energy-constrained embedded systems.
Technical Context
This device implements a precision voltage monitor with hysteresis (0.5% of VTH) and a digital reset timeout generator. Its reset assertion logic responds to VCC falling below 3.600V, MR low pulse ≥1µs, or watchdog timeout (not applicable to MAX6855). The active-high push-pull RESET output drives high with VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V) and remains asserted for ≥1200ms after VCC rises above threshold and MR deasserts.
The MAX6855UK36D6+T operates across –40°C to +85°C, draws only 170nA (typ) at VCC = 1.8V, and maintains functional reset behavior down to VCC = 1.1V. Its MR input accepts CMOS-compatible levels (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC), features 200ns glitch rejection, and introduces 250ns delay from MR low to RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.600V ±2.5% - precise brownout detection point for 3.3V/3.6V system rails |
| Reset Timeout Period | 600ms to 1200ms (min) - ensures µP completes power stabilization before release |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in always-on medical sensors |
| Reset Output Type | Active-high push-pull - eliminates external pullup, directly interfaces to µP reset pin |
| VCC Validity Range | Guaranteed RESET validity down to VCC = +1.1V - supports deep brownout recovery |
| MR Input Pullup | 10kΩ internal - enables momentary switch interface without external components |
| Operating Temp | –40°C to +85°C - qualified for industrial and portable medical equipment environments |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output that drives high during reset assertion; referenced to VCC; sinks 1.2mA min at VOL ≤ 0.3V |
| 2 | GND | Ground reference for all internal circuits and reset timing; must connect to system ground plane |
| 3 | MR (active-low) | Manual reset input with 10kΩ internal pullup to VCC; accepts CMOS logic; 250ns MR-to-RESET delay |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in noisy PCB layouts |
| 5 | VCC | Supply voltage input monitored for reset generation; bypass with 0.1µF ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell-powered devices |
| Reset threshold accuracy | ±2.5% over temperature ensures reliable detection across –40°C to +85°C without calibration |
| No external components | Integrated MR pullup, precision voltage reference, and timeout generator eliminate BOM cost and layout area |
| Brownout immunity | Valid reset assertion down to VCC = +1.1V prevents spurious release during deep undervoltage events |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - suppresses false resets from switching noise |
Applications
| Glucose Monitor Power Management | Patient Vital Sign Logger |
|---|---|
|
Use Scenario: Continuous glucose monitoring system powered by CR2032 coin cell, requiring reliable startup and brownout recovery during sensor calibration cycles. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high reset to ARM Cortex-M0 MCU during VCC ramp-up and transient dips below 3.6V. Use Value: 170nA quiescent current extends battery life beyond 24 months; 1200ms timeout ensures ADC and RF subsystems fully stabilize before firmware execution. |
Use Scenario: Portable ECG/SpO₂ logger operating in intermittent-sampling mode, where power cycling occurs frequently between measurements. IC Role / Device Role / Timing Role: Voltage monitor and reset coordinator ensuring deterministic µP boot sequence after each wake-up from deep sleep. Use Value: Guaranteed reset validity to VCC = +1.1V prevents undefined MCU state during partial discharge; MR input enables clinical staff-initiated recalibration reset. |
| Handheld Medical Diagnostic Tool | Low-Power Wearable Sensor Hub |
|
Use Scenario: Battery-operated ultrasound probe with integrated FPGA and analog front-end, requiring synchronized reset across multiple voltage domains. IC Role / Device Role / Timing Role: Primary supervisor generating clean, glitch-free active-high reset signal to FPGA configuration logic and µP host controller. Use Value: Push-pull output eliminates need for external pullup resistor; 3.600V threshold matches nominal 3.6V Li-ion battery voltage profile during discharge. |
Use Scenario: Multi-sensor wearable (accelerometer, temperature, PPG) transmitting data via BLE, operating on rechargeable LiPo with tight power budget. IC Role / Device Role / Timing Role: Brownout detector and manual reset interface for nRF52840 SoC, coordinating reset timing with PMIC sequencing. Use Value: 10kΩ internal MR pullup allows direct connection to tactile switch; 200ns MR glitch rejection prevents accidental resets from ESD transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.08V fixed threshold, 200ms timeout, open-drain output, 1.6µA ICC | Lacks MR input; requires external pullup; higher supply current reduces battery life | Select when lower-cost open-drain interface suffices and 3.08V threshold aligns with 3.3V rail |
| MAX6369KA29D3+T | 2.93V threshold, 150ms timeout, active-low push-pull, 1.2µA ICC | Shorter timeout may not meet slow-ramp µP requirements; active-low polarity requires level shift | Choose for space-constrained designs needing faster reset release and compatibility with legacy active-low reset inputs |
Compared with TPS3837K33DBVR and MAX6369KA29D3+T, the MAX6855UK36D6+T delivers superior energy efficiency (170nA vs. µA-range ICC), precise 3.600V threshold matching modern 3.6V battery systems, and an active-high push-pull output eliminating external components - making it optimal for long-life, single-supply medical wearables.
Availability
MAX6855UK36D6+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and handheld diagnostic tools requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6855UK36D6+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 MAX6855UK36D6+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for ultra-low-power portable medical and battery-operated electronics requiring guaranteed reset functionality across wide temperature and voltage ranges.
FAQ
What is the exact reset threshold voltage of the MAX6855UK36D6+T?
The MAX6855UK36D6+T has a factory-trimmed reset threshold of 3.600V, with tolerance of ±2.5% over the full operating temperature range (–40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "36" corresponds to 3.600V nominal. The MAX6855UK36D6+T uses this precise threshold to reliably detect brownout conditions on 3.3V/3.6V system rails.
Does the MAX6855UK36D6+T include a watchdog timer function?
No, the MAX6855UK36D6+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input and watchdog functionality. The MAX6855UK36D6+T is a manual-reset-only supervisory circuit with active-high push-pull RESET output, MR input, and fixed 3.600V threshold - confirmed by its absence in the WDI column of the Selector Guide.
What is the reset timeout period for the MAX6855UK36D6+T?
The MAX6855UK36D6+T has a minimum reset timeout period of 1200ms, indicated by the "D6" suffix in its part number. Table 4 (Reset Timeout Periods) specifies D6 as 600ms (min), 900ms (typ), and 1200ms (max); the datasheet defines the guaranteed minimum as 1200ms. This extended timeout ensures robust power stabilization for complex µPs and peripherals before release.
Can the MAX6855UK36D6+T operate with supply voltages below 1.8V?
Yes, the MAX6855UK36D6+T is specified to operate with VCC as low as +1.2V (minimum) and guarantees valid reset output down to VCC = +1.1V. Electrical Characteristics confirm functional operation across VCC = 1.2V to 5.5V, and the "Guaranteed Reset Valid to VCC = +1.1V" feature explicitly supports deep brownout scenarios common in aging battery applications.
What package type and lead finish does the MAX6855UK36D6+T use?
The MAX6855UK36D6+T uses a 5-pin SOT23-5 package with lead-free (RoHS-compliant) finish, indicated by the "+T" suffix per Maxim's ordering conventions. The "+T" replaces "-T" to specify lead-free packaging, and the device shares mechanical dimensions and solder reflow profile with standard SOT23-5 footprints - verified in the Pin Configurations section and Ordering Information table.
MAX6855UK36D6+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:
- 3.6V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK36D6+T FAQ
1.How can I place an order for MAX6855UK36D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK36D6+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 MAX6855UK36D6+T reliable?
The price and inventory of MAX6855UK36D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK36D6+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK36D6+T?
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4.How is shipping managed for MAX6855UK36D6+T?
MAX6855UK36D6+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK36D6+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 MAX6855UK36D6+T?
For technical support, including MAX6855UK36D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK36D6+T requirements.
6.How does Aetrix verify that MAX6855UK36D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK36D6+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 MAX6855UK36D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK36D6+T?
All MAX6855UK36D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK36D6+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 MAX6855UK36D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK36D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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