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Analog Devices Inc./Maxim Integrated MAX6855UK28D5+T
- Part No.:
- MAX6855UK28D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK28D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,733
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Product details
Overview
The MAX6855UK28D5+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and fixed 300ms minimum reset timeout. It asserts an active-high push-pull RESET output when VCC drops below 2.800V (factory-trimmed threshold), MR is pulled low, or during power-up/brownout - ensuring reliable µP initialization in ultra-low-power systems. It is used in battery-powered medical monitors and portable instrumentation requiring guaranteed reset validity down to VCC = +1.1V.
For engineers reviewing the MAX6855UK28D5+T datasheet, MAX6855UK28D5+T pinout, MAX6855UK28D5+T application, or MAX6855UK28D5+T equivalent, this page delivers verified functional identity, exact reset threshold (2.800V), confirmed 300ms timeout (D5), active-high push-pull output topology, and validated alternative options for portable µP supervision with manual reset capability.
Technical Context
This device integrates a precision bandgap-based voltage monitor, a digital reset timeout timer, and a CMOS-compatible manual reset input with 10kΩ internal pullup. Its reset assertion logic is triggered solely by VCC falling below 2.800V ±2.5%, MR low pulse ≥1µs, or power-on sequencing - no watchdog or CT pin functionality is present.
The active-high push-pull RESET output drives to ≥0.8×VCC when deasserted (ISOURCE = 500µA, VCC ≥ 2.38V) and sinks to ≤0.3V when asserted (ISINK = 1.2mA, VCC ≥ 2.38V), with guaranteed validity across VCC = 1.2V to 5.5V and operating temperature −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.800V ±2.5% - factory-trimmed voltage at which RESET asserts on VCC fall; enables precise brownout detection for 2.8V/3.0V rails. |
| Reset Timeout | 300ms (min) - fixed D5 option ensures sufficient µP initialization time after VCC rise or MR release before deassertion. |
| Supply Current | 170nA (typ) at VCC = 1.8V - ultra-low quiescent current extends battery life in always-on portable devices. |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup; directly interfaces to µP reset inputs requiring high-active assertion. |
| VCC Operating Range | 1.2V to 5.5V - supports supervision of diverse supply rails including Li-ion battery (3.0–4.2V) and low-voltage logic (1.8V). |
| Reset Validity Limit | VCC ≥ 1.1V - guarantees RESET remains valid during deep brownout, critical for fail-safe operation in medical sensors. |
| MR Input Logic | Active-low, internally pulled up to VCC via 10kΩ - accepts CMOS-level signals; requires <1µs pulse width for reliable reset initiation. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-lead SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high during reset assertion, low when deasserted; referenced to VCC. |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane for stable reset timing. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); initiates reset when pulled ≤0.3×VCC. |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity in high-EMI environments. |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF ceramic capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - enables multi-year operation from coin-cell batteries in glucose monitors and wearables. |
| Guaranteed reset validity | Valid down to VCC = +1.1V - ensures deterministic reset behavior during severe brownout, unlike many competitors failing at 1.5V. |
| No external components required | Self-contained supervision - eliminates BOM cost and layout area for RC networks or external pullups. |
| Immunity to short VCC transients | Rejects ≤40µs transients at 100mV overdrive - prevents false resets in noisy automotive or industrial power rails. |
| Factory-trimmed accuracy | ±2.5% reset threshold tolerance - removes need for calibration or trimming in production test. |
Applications
| Glucose Monitors | Patient Vital Sign Sensors |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 10+ days on single CR2032 cell. IC Role / Device Role / Timing Role: Supervises 2.8V analog front-end and BLE SoC; asserts RESET during battery sag below 2.8V to prevent corrupted sensor readings. Use Value: 170nA ICC extends runtime >15% vs. 1µA alternatives; 300ms timeout ensures ADC and RF initialization completes before firmware execution. |
Use Scenario: Portable ECG/SpO₂ sensor with intermittent wireless upload and low-power sleep cycles. IC Role / Device Role / Timing Role: Monitors 3.0V LDO output powering MCU and analog signal chain; triggers hard reset on brownout to avoid memory corruption. Use Value: Active-high push-pull RESET directly drives ARM Cortex-M reset pin without level-shifting; 1.1V validity prevents spurious resets during rapid battery discharge. |
| Industrial Handheld Scanners | Smart Wearable Trackers |
Use Scenario: Rugged barcode scanner powered by rechargeable LiPo, subjected to thermal cycling and ESD events. IC Role / Device Role / Timing Role: Provides MR-initiated reset via button press and VCC supervision during hot-swap battery replacement. Use Value: MR's 1µs minimum pulse width and 200ns glitch rejection ensure reliable manual reset despite mechanical switch bounce; dual-GND pins reduce ground bounce noise. |
Use Scenario: Fitness tracker with motion-sensing ASIC and Bluetooth LE radio operating from 3.0V regulated rail. IC Role / Device Role / Timing Role: Resets system on VCC drop caused by peak RF transmit current draw; deasserts only after stable 300ms delay. Use Value: 2.800V threshold matches nominal LiPo voltage under load; 5-pin SOT23 footprint minimizes PCB area in space-constrained wristband designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K28QDBVR | 2.8V threshold, 200ms timeout, open-drain active-low RESET, 1.5µA ICC | Requires external pullup; higher supply current reduces battery life in multi-year devices | Select when legacy open-drain interface or lower-cost sourcing is prioritized over ultra-low power |
| MAX6369KA28+T | 2.8V threshold, 200ms timeout, push-pull active-low RESET, 800nA ICC | Active-low output conflicts with µPs requiring high-active reset; higher ICC than MAX6855UK28D5+T | Choose only if board-level redesign accommodates inverted reset polarity and 4.7× higher quiescent current |
Compared with TPS3837K28QDBVR and MAX6369KA28+T, the MAX6855UK28D5+T uniquely combines 2.8V supervision, 300ms timeout, active-high push-pull output, and 170nA ICC - making it optimal for space- and energy-constrained medical and portable electronics where reset polarity, timing margin, and battery longevity are co-critical.
Availability
MAX6855UK28D5+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign sensors, industrial handheld scanners, and smart wearable trackers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX6855UK28D5+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 industrial, medical, and communications markets.
The MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in battery-critical portable equipment, emphasizing ultra-low ICC, guaranteed reset validity at sub-1.2V VCC, and factory-trimmed voltage accuracy.
FAQ
What is the exact reset threshold voltage of the MAX6855UK28D5+T?
The MAX6855UK28D5+T has a factory-trimmed reset threshold of 2.800V ±2.5%, corresponding to suffix "28" per Maxim's Threshold Suffix Guide (Table 2). This value is guaranteed across −40°C to +85°C and defines the VCC voltage at which the active-high RESET output asserts during power-down or brownout conditions.
Does the MAX6855UK28D5+T include a watchdog timer function?
No, the MAX6855UK28D5+T does not include a watchdog timer. Per the Selector Guide and Pin Description, only MAX6864–MAX6869 variants feature WDI input; the MAX6855UK28D5+T belongs to the MAX6854/MAX6855/MAX6856 group, which provides voltage monitoring and manual reset only - no watchdog circuitry or related pins.
What is the reset timeout period for the MAX6855UK28D5+T?
The MAX6855UK28D5+T uses the D5 reset timeout option, providing a minimum reset assertion period of 300ms after VCC rises above 2.800V or after the MR input is released. This value is fixed and non-adjustable, as confirmed by the ordering code "D5" and Table 4 of the datasheet.
What type of RESET output does the MAX6855UK28D5+T provide?
The MAX6855UK28D5+T provides an active-high push-pull RESET output (Pin 1), as specified in the MAX6855 column of the Pin Description table. When asserted, RESET drives high to ≥0.8×VCC; when deasserted, it drives low to ≤0.3V - eliminating need for external pullup resistors.
Is the MAX6855UK28D5+T RoHS-compliant and lead-free?
Yes, the "+T" suffix in MAX6855UK28D5+T explicitly denotes lead-free, RoHS-compliant packaging per Maxim's Ordering Information note: "Specify lead-free by replacing '-T' with '+T' when ordering." The device uses standard SOT23-5 lead-free terminations and meets JEDEC J-STD-020 reflow profiles.
MAX6855UK28D5+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:
- 2.8V
- 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
MAX6855UK28D5+T FAQ
1.How can I place an order for MAX6855UK28D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK28D5+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 MAX6855UK28D5+T reliable?
The price and inventory of MAX6855UK28D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK28D5+T is usually 5 days.
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Once your MAX6855UK28D5+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 MAX6855UK28D5+T?
For technical support, including MAX6855UK28D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK28D5+T requirements.
6.How does Aetrix verify that MAX6855UK28D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK28D5+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 MAX6855UK28D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK28D5+T?
All MAX6855UK28D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK28D5+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 MAX6855UK28D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK28D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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