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Analog Devices Inc./Maxim Integrated MAX6855UK44D5+T
- Part No.:
- MAX6855UK44D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK44D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,244
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Product details
Overview
MAX6855UK44D5+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, 4.266V (min) factory-trimmed reset threshold, 300ms minimum reset timeout period, and manual reset input. It monitors VCC supply integrity and asserts reset during power-up, brownout, or operator-initiated recovery in ultra-low-power portable systems.
For engineers reviewing the MAX6855UK44D5+T datasheet, MAX6855UK44D5+T pinout, MAX6855UK44D5+T application, or MAX6855UK44D5+T equivalent, this device serves as a precision voltage monitor with deterministic reset timing, low-quiescent-current supervision, and CMOS-compatible manual reset interface for battery-critical embedded designs.
Technical Context
The MAX6855UK44D5+T implements a precision bandgap-based voltage comparator with 2.5% threshold tolerance and hysteresis of 0.5% VTH to prevent chatter near trip point. Its internal timer guarantees reset assertion for ≥300ms after VCC rises above 4.266V and MR deasserts.
It features an internally pulled-up MR input (10kΩ to VCC), glitch rejection of 200ns, and MR-to-reset delay of 250ns. Reset output remains valid down to VCC = +1.1V, supporting reliable initialization in deep-brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.266V (min), factory-trimmed - ensures accurate detection of 4.3V nominal supply collapse |
| Reset Timeout Period | 300ms (min) - guarantees µP reset hold time sufficient for full core initialization |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Operating Voltage Range | 1.2V to 5.5V - supports supervision of 1.8V, 2.5V, 3.3V, and 5V rails |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup and drives high-impedance µP inputs directly |
| VCC Validity Limit | Reset asserted down to VCC = 1.1V - maintains functional reset behavior deeper into brownout than most competitors |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies manual reset switch design without external components |
Pinout & Package
Package: 5-pin SOT23 (lead-free, RoHS-compliant).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin directly; sinks/source current per VOH/VOL specs |
| 2, 4 | GND | Ground reference - both pins must be connected to common system ground plane |
| 3 | MR | Active-low manual reset input - logic low initiates reset; internally pulled up to VCC (10kΩ) |
| 5 | VCC | Supply voltage input - monitored rail; requires 0.1µF bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in glucose monitors and wearables beyond 5 years |
| Factory-trimmed reset threshold | 4.266V (min) - eliminates external resistor divider and calibration overhead |
| Guaranteed reset validity to 1.1V | Ensures reset assertion even during severe brownout - prevents undefined µP state |
| No external components required | Integrated MR pullup, precision reference, and timing - reduces BOM count and PCB area |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - avoids false resets in noisy power environments |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Glucose meter operating from CR2032 coin cell with intermittent sensor activation. IC Role / Device Role / Timing Role: Supervises 3.3V supply rail and provides 300ms reset pulse to ARM Cortex-M0 MCU on power-up and low-battery brownout. Use Value: 170nA quiescent current preserves >95% battery capacity during 3-year shelf life; 4.266V threshold detects end-of-life battery sag before system failure. | Use Scenario: Wireless environmental sensor node powered by Li-SOCl₂ battery, transmitting data every 10 minutes. IC Role / Device Role / Timing Role: Monitors 3.6V main rail and asserts active-high reset to wake microcontroller from deep sleep only when stable voltage is confirmed. Use Value: Push-pull RESET eliminates external pullup, reducing leakage path; guaranteed reset down to 1.1V ensures safe restart even after cold-temperature voltage droop. |
| Wearable Health Trackers | Industrial Handheld Terminals |
Use Scenario: Optical heart-rate monitor with OLED display, powered by rechargeable Li-ion cell. IC Role / Device Role / Timing Role: Provides manual reset via tactile button (connected to MR) and automatic reset on VCC dip during display backlight surge. Use Value: MR's 250ns delay and 200ns glitch rejection prevent spurious resets from ESD or switching noise; 300ms timeout accommodates full BLE radio initialization sequence. | Use Scenario: Ruggedized barcode scanner with flash memory and motor driver, operating across -20°C to +70°C ambient. IC Role / Device Role / Timing Role: Supervises 5V system rail and delivers clean reset signal to FPGA configuration logic during hot-swap battery replacement. Use Value: 1.2V–5.5V operating range covers wide input variation; 2.5% threshold tolerance ensures consistent trip point across temperature (-40°C to +85°C). |
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 reset threshold; 200ms reset timeout; open-drain output | Lacks MR input; requires external pullup; lower threshold unsuitable for 4.3V rail monitoring | Select only if 3.3V rail supervision and no manual reset are acceptable |
| ADM6806-43ARTZ-R7 | 4.33V threshold (±1.5%); 200ms timeout; push-pull active-low output | Active-low output requires level-shifting for µPs with active-high reset; no MR pin | Choose when active-low reset interface is already designed and MR functionality is unused |
Compared with TPS3837K33DBVR and ADM6806-43ARTZ-R7, the MAX6855UK44D5+T uniquely combines 4.266V threshold accuracy, 300ms timeout, active-high push-pull output, and integrated MR-enabling single-chip, zero-BOM-supervision for 4.3V systems with manual recovery capability.
Availability
MAX6855UK44D5+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, wearable health trackers, and industrial handheld terminals requiring stable component supply and long-term lifecycle support.
Supply support for MAX6855UK44D5+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 interface applications in demanding environments.
The MAX685x family targets ultra-low-power microprocessor supervision in space-constrained, battery-operated systems where nanoscale current draw and guaranteed reset timing are critical to product lifetime and reliability.
FAQ
What is the exact reset threshold voltage of MAX6855UK44D5+T?
The MAX6855UK44D5+T has a factory-trimmed reset threshold of 4.266V (minimum), 4.375V (typical), and 4.484V (maximum) - corresponding to suffix "44" per Maxim's Threshold Suffix Guide. This ensures precise supervision of 4.3V nominal rails without external calibration.
Does MAX6855UK44D5+T include a watchdog timer function?
No, the MAX6855UK44D5+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides voltage monitoring and manual reset only. Watchdog functionality is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK44D5S+T).
What is the reset timeout period for MAX6855UK44D5+T?
The MAX6855UK44D5+T has a 300ms minimum reset timeout period (suffix "D5"), with typical value 450ms and maximum 600ms. This duration ensures reliable µP core and peripheral initialization before release, meeting JEDEC JESD78 requirements for reset hold time.
Is MAX6855UK44D5+T compatible with 1.8V microcontrollers?
Yes, MAX6855UK44D5+T operates from 1.2V to 5.5V and guarantees valid reset output down to VCC = 1.1V. Its active-high push-pull RESET output meets VOH ≥ 0.8×VCC and VOL ≤ 0.3V across 1.8V–5.5V, ensuring direct interface with 1.8V logic without level shifters.
How is the manual reset input (MR) configured on MAX6855UK44D5+T?
The MR pin on MAX6855UK44D5+T is active-low with an internal 10kΩ pullup to VCC. Driving MR to GND initiates reset; releasing it allows reset to remain asserted for the full 300ms timeout. No external components are needed - a simple momentary switch from MR to GND suffices.
MAX6855UK44D5+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:
- 4.375V
- 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
MAX6855UK44D5+T FAQ
1.How can I place an order for MAX6855UK44D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK44D5+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 MAX6855UK44D5+T reliable?
The price and inventory of MAX6855UK44D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK44D5+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK44D5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK44D5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK44D5+T?
MAX6855UK44D5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK44D5+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 MAX6855UK44D5+T?
For technical support, including MAX6855UK44D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK44D5+T requirements.
6.How does Aetrix verify that MAX6855UK44D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK44D5+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 MAX6855UK44D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK44D5+T?
All MAX6855UK44D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK44D5+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 MAX6855UK44D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK44D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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