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Analog Devices Inc./Maxim Integrated MAX6855UK32D1+T
- Part No.:
- MAX6855UK32D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK32D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,567
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Product details
Overview
The MAX6855UK32D1+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 3.2V reset threshold with 10ms minimum reset timeout. It monitors VCC for brownout detection, asserts reset during power-up/down, and guarantees valid reset operation down to VCC = +1.1V. Used in ultra-low-power portable medical and consumer devices requiring reliable power-on initialization.
For engineers reviewing the MAX6855UK32D1+T datasheet, MAX6855UK32D1+T pinout, MAX6855UK32D1+T application, or MAX6855UK32D1+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters, real-world use cases, and validated alternative options - all grounded in Maxim's official documentation for the precise part number.
Technical Context
The MAX6855UK32D1+T implements a voltage-monitoring comparator with 2.5% threshold accuracy, internal 10kΩ MR pullup, and fixed 10ms reset timeout after VCC recovery or MR deassertion. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 500µA load when asserted.
No watchdog timer or CT input is present - per Selector Guide and Pin Description, MAX6855 supports only MR and reset monitoring, distinguishing it from MAX6864–MAX6869 (WDI) and MAX6861–MAX6863 (CT-selectable timeout). Reset assertion occurs at VCC falling below 3.2V ±2.5%, with immunity to transients ≤40µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.2V ±2.5% - precisely trimmed for 3.3V system brownout detection with guaranteed margin against noise-induced false triggers |
| Reset Timeout | 10ms (min) - ensures µP reset pulse meets minimum hold time requirements for ARM Cortex-M0/M3 and similar low-power MCUs |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in glucose monitors and wearable sensors |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail embedded systems without external regulation |
| Reset Valid Down To | VCC = +1.1V - maintains deterministic reset state during deep brownout, preventing undefined MCU behavior |
| MR Input Logic | Active-low, internally pulled up to VCC via 10kΩ - eliminates need for external pullup; compatible with open-drain GPIO or mechanical switch |
| RESET Output Type | Push-pull active-high - drives high to VCC (≥0.8×VCC at 500µA) when deasserted; no external pullup required |
Pinout & Package
Package: 5-pin SOT23-5 (1.6mm × 2.9mm × 1.1mm), lead-free, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; directly interfaces to µP reset pin without level-shifting |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return for all internal circuits |
| 3 | MR | Active-low manual reset input - initiates reset when pulled low; internally pulled up to VCC (10kΩ) |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in high-frequency layouts |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF ceramic capacitor to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in always-on patient monitors |
| Guaranteed VCC = +1.1V operation | Ensures reset remains valid through deep undervoltage events where most supervisors fail |
| No external components required | Eliminates BOM cost and board space for pullups, capacitors, or resistors beyond 0.1µF VCC bypass |
| Immunity to short VCC transients | Rejects glitches ≤40µs at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments |
| CMOS-compatible MR interface | Accepts standard logic levels; 1µs minimum MR pulse width allows direct connection to FPGA or ASIC control signals |
Applications
| Glucose Monitoring Systems | Portable ECG Devices |
|---|---|
Use Scenario: Battery-powered handheld glucose meter operating from single 3V coin cell with intermittent sensor activation. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high reset to ARM Cortex-M0 MCU during cold start and low-battery brownout. Use Value: 170nA quiescent current extends battery life to >3 years; 3.2V threshold aligns with 3.3V rail tolerance; 10ms timeout satisfies MCU reset hold-time spec. |
Use Scenario: Wearable ECG patch with ultra-low-power analog front-end and BLE radio, powered by rechargeable LiPo. IC Role / Device Role / Timing Role: Power-on reset generator ensuring clean initialization of ADC, op-amps, and wireless SoC after charge-cycle wake-up. Use Value: Valid reset down to VCC = +1.1V prevents erratic analog readings during partial discharge; push-pull output eliminates pullup resistor on sensitive analog ground. |
| Smart Hearing Aids | Industrial Wireless Sensors |
Use Scenario: Miniaturized hearing aid using custom ASIC and MEMS microphone, powered by zinc-air battery. IC Role / Device Role / Timing Role: Brownout detector triggering reset before ASIC enters undefined state during battery depletion. Use Value: 5-pin SOT23 footprint fits tight PCB area; 3.2V threshold matches ASIC supply spec; MR pin enables user-initiated recalibration via tactile switch. |
Use Scenario: LoRaWAN node deployed in remote locations, powered by energy harvesting or long-life primary cells. IC Role / Device Role / Timing Role: System-level supervisor coordinating reset of microcontroller, RF transceiver, and environmental sensors during cold start. Use Value: Immunity to 40µs VCC transients prevents false resets from switching regulator ripple; 1.2V–5.5V range accommodates variable harvester output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.3V fixed threshold, 200ms reset timeout, open-drain active-low output, 1.6µA ICC | Requires external pullup; longer timeout may delay system boot in time-critical applications | Select if open-drain interface or longer timeout is preferred; verify compatibility with µP reset polarity and timing budget |
| MAX6315US32D3+T | 3.2V threshold, 10ms timeout, push-pull active-low output, 1.2µA ICC, same SOT23-5 package | Active-low reset requires µP reset pin inversion or logic gate; higher ICC reduces battery life vs. MAX6855UK32D1+T | Choose when legacy design uses active-low reset signaling; confirm µP accepts low-active reset and tolerates 1.2µA vs. 170nA supply drain |
Compared with TPS3837K33DBVR and MAX6315US32D3+T, the MAX6855UK32D1+T uniquely combines ultra-low 170nA supply current, active-high push-pull output, and precise 3.2V/10ms configuration - making it optimal for battery-constrained medical wearables where every nanoamp and millisecond matters.
Availability
MAX6855UK32D1+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, smart hearing aids, and industrial wireless sensors requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK32D1+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 MAX6854–MAX6869 family delivers nanopower supervisory functionality targeting battery-operated portable electronics where minimal current draw and guaranteed reset validity at ultra-low VCC are critical system requirements.
FAQ
What is the exact reset threshold voltage of the MAX6855UK32D1+T?
The MAX6855UK32D1+T has a factory-trimmed reset threshold of 3.2V with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "32" corresponds to VTH = 3.2V nominal. The MAX6855UK32D1+T maintains this specification without external calibration or adjustment.
Does the MAX6855UK32D1+T include a watchdog timer function?
No, the MAX6855UK32D1+T does not include a watchdog timer. Per the Selector Guide and Pin Description, only MAX6864–MAX6869 variants feature WDI input; MAX6855 supports only VCC monitoring and manual reset (MR). The MAX6855UK32D1+T is functionally identical to MAX6854/MAX6856 except for its active-high push-pull RESET output.
What is the reset timeout period for the MAX6855UK32D1+T?
The MAX6855UK32D1+T has a fixed minimum reset timeout period of 10ms, as indicated by the "D1" suffix in its part number. This is verified in Table 4 (Reset Timeout Periods), where D1 specifies 10ms (min)/15ms (typ)/25ms (max). The timeout begins after VCC rises above the 3.2V threshold or MR is deasserted.
Can the MAX6855UK32D1+T operate with a 1.8V supply?
Yes, the MAX6855UK32D1+T operates from VCC = 1.2V to 5.5V, including 1.8V systems. Its 170nA typical supply current and guaranteed reset validity down to VCC = +1.1V make it suitable for low-voltage IoT edge nodes. At 1.8V, RESET output high-level voltage is ≥0.8×VCC (≥1.44V) at 200µA source current, per Electrical Characteristics table.
Is the MAX6855UK32D1+T pin-compatible with other MAX68xx supervisory ICs?
The MAX6855UK32D1+T shares the same 5-pin SOT23-5 package and pinout as MAX6854 and MAX6856 (Pins 1=RESET, 2=GND, 3=MR, 4=GND, 5=VCC), but differs in RESET polarity: MAX6855 outputs active-high, while MAX6854 is active-low push-pull and MAX6856 is active-low open-drain. Direct substitution requires verifying µP reset pin polarity and drive strength compatibility.
MAX6855UK32D1+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:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK32D1+T FAQ
1.How can I place an order for MAX6855UK32D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK32D1+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 MAX6855UK32D1+T reliable?
The price and inventory of MAX6855UK32D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK32D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK32D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK32D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK32D1+T?
MAX6855UK32D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK32D1+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 MAX6855UK32D1+T?
For technical support, including MAX6855UK32D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK32D1+T requirements.
6.How does Aetrix verify that MAX6855UK32D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK32D1+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 MAX6855UK32D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK32D1+T?
All MAX6855UK32D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK32D1+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 MAX6855UK32D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK32D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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