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Analog Devices Inc./Maxim Integrated MAX6855UK28D2+T
- Part No.:
- MAX6855UK28D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK28D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,718
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Product details
Overview
MAX6855UK28D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, providing active-high push-pull reset output, manual reset input (MR), and factory-trimmed 2.800V reset threshold with 120ms typical reset timeout. It monitors VCC supply integrity down to 1.1V and asserts reset during power-up, brownout, or MR activation - used in battery-powered medical and portable electronics for reliable µP initialization.
For engineers reviewing the MAX6855UK28D2+T datasheet, MAX6855UK28D2+T pinout, MAX6855UK28D2+T application, or MAX6855UK28D2+T equivalent, key selection criteria include its ultra-low 170nA typical supply current, guaranteed reset validity at VCC = 1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), and compatibility with CMOS-level MR signaling.
Technical Context
The MAX6855UK28D2+T implements a precision voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, paired with a fixed 120ms minimum reset timeout (D2 option). Its active-high push-pull RESET output is referenced to VCC and sinks up to 1.2mA at VCC ≥ 2.38V while maintaining VOH ≥ 0.8×VCC.
It features an internally pulled-up MR input (10kΩ to VCC), supporting logic-low assertion with <1µs minimum pulse width and 200ns glitch rejection. No external components are required, and it operates across VCC = 1.2V to 5.5V with guaranteed functionality down to VCC = 1.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.800V ±2.5% - precisely holds µP in reset until VCC stabilizes above nominal supply rail for clean boot. |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation on coin-cell batteries in portable diagnostics. |
| Reset Timeout | 120ms (min) - ensures sufficient hold time for slow-ramping power supplies and flash memory initialization. |
| VCC Operating Range | 1.2V to 5.5V - supports single-supply designs from low-voltage wearables to 3.3V/5V industrial controllers. |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and drives µP reset pin directly without level-shifting. |
| MR Input Logic | Active-low, internally pulled up to VCC (10kΩ) - simplifies manual reset interface with momentary switch to GND. |
| Reset Validity Limit | Guaranteed to VCC = 1.1V - maintains deterministic reset state during deep brownout conditions. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin directly; no external pullup required. |
| 2 | GND | Ground reference - must be connected to system ground plane for accurate voltage monitoring. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; assert low to force system reset. |
| 4 | GND | Second ground terminal - improves noise immunity and thermal dissipation in high-density layouts. |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF 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 glucose monitors and wearable sensors. |
| VCC Immunity | Immune to VCC transients ≤40µs at 100mV overdrive - prevents spurious resets in electrically noisy environments. |
| No External Components | Self-contained supervision - eliminates BOM cost and layout area for RC timing networks or pullup resistors. |
| Guaranteed Reset at Low VCC | Valid RESET assertion down to VCC = 1.1V - ensures fail-safe behavior during critical brownout recovery. |
| CMOS-Compatible MR | MR accepts standard CMOS logic levels and tolerates 200ns glitches - simplifies integration with FPGA or ASIC reset logic. |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
|
Use Scenario: Glucose meter powered by CR2032 coin cell with intermittent usage over 3+ years. IC Role / Device Role / Timing Role: Supervises VCC ramp-up at power-on and asserts active-high RESET to ARM Cortex-M0 until stable 3.0V is confirmed. Use Value: 170nA quiescent current extends battery life; 120ms timeout accommodates slow analog front-end stabilization. |
Use Scenario: Wireless environmental sensor node sleeping >99% of time, waking every 5 minutes to sample and transmit. IC Role / Device Role / Timing Role: Monitors 1.8V LDO output and forces µP reset if supply dips below 1.7V during RF transmission surge. Use Value: Guaranteed reset validity to 1.1V prevents undefined µP state during deep discharge; MR allows firmware-triggered safe reboot. |
| Wearable Health Trackers | Industrial Handheld Terminals |
|
Use Scenario: Optical heart-rate monitor using photodiode array and low-power ADC, operating from 2.5V LiPo cell. IC Role / Device Role / Timing Role: Provides active-high RESET signal to nRF52832 SoC, synchronized with VCC rise and MR button press. Use Value: Push-pull output eliminates external pullup, saving board space; 2.800V threshold matches nominal 2.8V battery cutoff. |
Use Scenario: Ruggedized barcode scanner with cold-cranking capability and wide-temperature operation (-20°C to +70°C). IC Role / Device Role / Timing Role: Supervises 3.3V main rail and asserts RESET during engine-start voltage sag (dips to 2.5V for 50ms). Use Value: 120ms timeout exceeds worst-case sag duration; ±2.5% threshold tolerance ensures consistent reset point across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K28QDBVR | 2.8V threshold, 200ms timeout, open-drain active-low RESET, 1.6µA ICC | Requires external pullup; higher ICC reduces battery life in ultra-low-power designs | Select when legacy open-drain interface or automotive AEC-Q100 qualification is required |
| MAX6361KA28D2+T | 2.8V threshold, 120ms timeout, active-low push-pull RESET, 1.2µA ICC | Active-low output conflicts with µP reset pin polarity; higher ICC increases standby load | Select only if existing design uses active-low reset and cannot modify µP configuration or PCB layout |
Compared with TPS3837K28QDBVR and MAX6361KA28D2+T, the MAX6855UK28D2+T delivers superior energy efficiency (170nA vs. >1µA), eliminates external components via active-high push-pull output, and guarantees reset validity down to 1.1V - making it optimal for long-life battery-powered systems where reset polarity and ultra-low ICC are critical.
Availability
MAX6855UK28D2+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, and wearable health trackers requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6855UK28D2+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 management, sensing, and interface applications in industrial, medical, and consumer markets.
The MAX6855UK28D2+T belongs to the MAX6854–MAX6869 nanopower µP supervisory family, engineered specifically for ultra-low-power battery-operated systems requiring reliable reset generation with minimal current draw and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6855UK28D2+T?
The MAX6855UK28D2+T has a factory-trimmed reset threshold of 2.800V, with ±2.5% tolerance 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 "28" corresponds to 2.800V nominal. The MAX6855UK28D2+T maintains this accuracy without calibration or external components.
Does the MAX6855UK28D2+T include a watchdog timer function?
No, the MAX6855UK28D2+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides only voltage monitoring and manual reset functions. Watchdog capability is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK28D2S+T). The MAX6855UK28D2+T pinout and functional diagram confirm absence of WDI terminal.
What is the reset timeout period for the MAX6855UK28D2+T?
The MAX6855UK28D2+T uses the D2 reset timeout option, providing a minimum reset pulse width of 40ms, typical 60ms, and maximum 80ms. This is specified in Table 4 (Reset Timeout Periods) and confirmed by the "D2" suffix in the part number. The timeout begins after VCC rises above the 2.800V threshold and MR deasserts.
Can the MAX6855UK28D2+T operate with a 1.5V supply?
Yes, the MAX6855UK28D2+T operates with VCC as low as 1.2V and guarantees valid reset assertion down to VCC = 1.1V. At 1.5V supply, it continues to monitor and assert RESET when VCC falls below 2.800V - though the 2.800V threshold exceeds the supply, meaning RESET remains asserted continuously. For 1.5V systems, a lower-threshold variant (e.g., MAX6855UK16D2+T, 1.575V) is appropriate.
Is the MAX6855UK28D2+T pin-compatible with other MAX68xx supervisory ICs?
The MAX6855UK28D2+T shares the same 5-pin SOT23-5 package and pinout as MAX6854/MAX6856/MAX6858/MAX6860–MAX6863 variants (Pin 1=RESET, Pin 2=GND, Pin 3=MR, Pin 4=GND, Pin 5=VCC). However, it is not pin-compatible with MAX6864–MAX6869 (which add WDI on Pin 1) or MAX6861–MAX6863 (which use Pin 1 for CT). Always verify functional compatibility beyond physical pinout.
MAX6855UK28D2+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:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK28D2+T FAQ
1.How can I place an order for MAX6855UK28D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK28D2+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 MAX6855UK28D2+T reliable?
The price and inventory of MAX6855UK28D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK28D2+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK28D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK28D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK28D2+T?
MAX6855UK28D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK28D2+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 MAX6855UK28D2+T?
For technical support, including MAX6855UK28D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK28D2+T requirements.
6.How does Aetrix verify that MAX6855UK28D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK28D2+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 MAX6855UK28D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK28D2+T?
All MAX6855UK28D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK28D2+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 MAX6855UK28D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK28D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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