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Analog Devices Inc./Maxim Integrated MAX6855UK32D6+T
- Part No.:
- MAX6855UK32D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK32D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,248
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Product details
Overview
The MAX6855UK32D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and factory-trimmed 3.2V reset threshold (±2.5%). It provides 1200ms minimum reset timeout, ultra-low 170nA typical supply current, and guaranteed reset validity down to VCC = +1.1V. It is used in battery-powered medical monitors and portable electronics for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6855UK32D6+T datasheet, MAX6855UK32D6+T pinout, MAX6855UK32D6+T application, or MAX6855UK32D6+T equivalent, key selection criteria include its 3.2V reset threshold accuracy, 1200ms timeout, MR-driven reset assertion, push-pull active-high output logic, and immunity to sub-40µs VCC transients - all critical for low-power embedded system reliability.
Technical Context
This device implements a precision voltage monitor with hysteresis (0.5% of VTH) and an internal timer that holds RESET asserted for ≥600ms (typical 900ms, max 1200ms) after VCC rises above 3.2V and MR deasserts. The MR input features 10kΩ internal pullup, 1µs minimum pulse width support, and 200ns glitch rejection.
No watchdog timer or CT pin functionality is present - the MAX6855UK32D6+T is a dedicated supervisory IC with fixed reset threshold and timeout, optimized for simplicity and ultra-low quiescent current in space-constrained, battery-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.200V ±2.5% (factory-trimmed; ensures accurate brownout detection at nominal 3.3V rail) |
| Reset Timeout Period | 600–1200ms (D6 option; guarantees µP initialization completes before release) |
| Supply Current | 170nA typical (enables >10-year battery life in always-on glucose monitors) |
| Reset Output Type | Push-pull active-high (drives high to µP's active-high reset pin without external pullup) |
| VCC Operating Range | 1.2V to 5.5V (supports Li-ion, coin-cell, and multi-rail systems) |
| Reset Validity Limit | Guaranteed to VCC = +1.1V (ensures deterministic reset behavior during deep brownout) |
| MR Input Logic | Active-low with 10kΩ internal pullup (simplifies switch interface; no external resistor needed) |
Pinout & Package
5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant, rated for -40°C to +85°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; drives high during reset assertion; referenced to VCC |
| 2 | GND | Ground reference for all internal circuits and reset timing |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); asserts reset when pulled low |
| 4 | GND | Second ground connection for improved 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 enables decade-scale battery operation in wearable devices |
| Reset threshold accuracy | ±2.5% over temperature ensures consistent trip point across -40°C to +85°C |
| Immunity to VCC transients | Rejects <40µs glitches at 100mV overdrive - prevents spurious resets in noisy environments |
| No external components | Integrates pullup, timing capacitor, and voltage reference - eliminates BOM cost and layout area |
| Guaranteed reset at low VCC | Valid RESET output down to VCC = +1.1V supports ultra-low-voltage microcontrollers |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission and coin-cell power. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high reset to ARM Cortex-M0+ MCU during power-up and brownout events. Use Value: 170nA ICC extends CR2032 battery life beyond 3 years; 1200ms timeout ensures full ADC calibration and BLE stack initialization. |
Use Scenario: Portable ECG/SpO₂ recorder operating from single AAA cell with sleep-wake cycling. IC Role / Device Role / Timing Role: Voltage monitor and reset generator for MSP430FR59xx MCU, triggered by MR button press or VCC sag. Use Value: 3.2V threshold matches nominal AAA voltage profile; 10kΩ MR pullup eliminates external resistor, reducing footprint. |
| Industrial Handheld Scanners | Smart Wearable Sensors |
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion with cold-temperature operation. IC Role / Device Role / Timing Role: Brownout protector for NXP i.MX RT1020 crossover MCU, asserting reset when VCC drops below 3.2V during motor-induced dips. Use Value: Immunity to 30µs transients prevents false resets during motor commutation; -40°C to +85°C rating ensures field reliability. |
Use Scenario: Ultra-thin fitness tracker with optical heart-rate sensor and 3V coin-cell supply. IC Role / Device Role / Timing Role: Power-on supervisor for Nordic nRF52833 SoC, providing clean reset signal before RF firmware execution. Use Value: Push-pull active-high output directly interfaces to nRF52833's RESETN pin; no level-shifting or pullup required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | 3.08V reset threshold, 200ms timeout, open-drain active-low output, 1.6µA ICC | Requires external pullup; higher ICC reduces battery life in multi-year deployments | Select only if legacy board uses open-drain reset and 3.08V threshold suffices |
| MAX6326UR31D3+T | 3.08V threshold, 150ms timeout, push-pull active-low, 1.2µA ICC, same SOT23-5 package | Shorter timeout may not accommodate slow-start regulators; active-low logic requires MCU pin compatibility check | Prefer for cost-sensitive designs where 150ms is sufficient and active-low reset is acceptable |
Compared with TPS3836K33DBVR and MAX6326UR31D3+T, the MAX6855UK32D6+T delivers 10× lower supply current, 8× longer reset timeout, and precise 3.2V threshold - making it optimal for long-life, high-reliability medical and industrial battery-powered systems requiring deterministic reset timing.
Availability
MAX6855UK32D6+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6855UK32D6+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 MAX6855UK32D6+T belongs to the MAX6854–MAX6869 nanopower supervisory family, engineered specifically for ultra-low-power battery-operated systems where reset accuracy, longevity, and minimal footprint are critical.
FAQ
What is the exact reset threshold voltage of the MAX6855UK32D6+T?
The MAX6855UK32D6+T has a factory-trimmed reset threshold of 3.200V with ±2.5% tolerance over temperature (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "32" corresponds to 3.200V nominal. The MAX6855UK32D6+T maintains this accuracy without external calibration.
Does the MAX6855UK32D6+T include a watchdog timer function?
No, the MAX6855UK32D6+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input; the MAX6855UK32D6+T is a manual-reset-only supervisory IC with MR input and no watchdog circuitry.
What is the function of Pin 1 on the MAX6855UK32D6+T?
Pin 1 of the MAX6855UK32D6+T is the RESET output, configured as an active-high push-pull driver. When asserted (during power-up, brownout, or MR activation), it drives high to the microcontroller's active-high reset input; it returns low when deasserted. This eliminates need for external pullup resistors.
Can the MAX6855UK32D6+T operate from a 1.8V supply?
Yes, the MAX6855UK32D6+T operates from 1.2V to 5.5V per Absolute Maximum Ratings and Electrical Characteristics tables. At VCC = 1.8V, its supply current is 170nA (typ), reset threshold remains 3.2V (so it will assert reset if VCC falls below 3.2V - meaning it cannot monitor 1.8V rails), and RESET output is valid down to VCC = 1.1V.
Is the MAX6855UK32D6+T pin-compatible with other devices in the MAX6854–MAX6869 family?
The MAX6855UK32D6+T shares the same 5-pin SOT23-5 pinout as MAX6854, MAX6855, MAX6856, MAX6861–MAX6863, and MAX6864–MAX6869 variants. However, pin functions differ: MAX6855UK32D6+T uses Pin 1 as active-high RESET and Pin 3 as MR, while MAX6864 variants use Pin 1 as RESET and Pin 4 as WDI - so direct substitution requires functional verification.
MAX6855UK32D6+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:
- 3.2V
- 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
MAX6855UK32D6+T FAQ
1.How can I place an order for MAX6855UK32D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK32D6+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 MAX6855UK32D6+T reliable?
The price and inventory of MAX6855UK32D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK32D6+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK32D6+T?
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4.How is shipping managed for MAX6855UK32D6+T?
MAX6855UK32D6+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK32D6+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 MAX6855UK32D6+T?
For technical support, including MAX6855UK32D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK32D6+T requirements.
6.How does Aetrix verify that MAX6855UK32D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK32D6+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 MAX6855UK32D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK32D6+T?
All MAX6855UK32D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK32D6+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 MAX6855UK32D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK32D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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