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Analog Devices Inc./Maxim Integrated MAX6855UK45D2+T
- Part No.:
- MAX6855UK45D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK45D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,171
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Product details
Overview
The MAX6855UK45D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and factory-trimmed 4.500V reset threshold with ±2.5% tolerance. It delivers ultra-low 170nA typical supply current, guarantees valid reset assertion down to VCC = +1.1V, and provides 40ms minimum reset timeout period. It is used in battery-powered medical monitors and portable electronics requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6855UK45D2+T datasheet, MAX6855UK45D2+T pinout, MAX6855UK45D2+T application, or MAX6855UK45D2+T equivalent, key selection criteria include its 4.5V threshold accuracy, 40ms timeout, MR-driven reset initiation, immunity to short VCC transients (<40µs at 100mV overdrive), and compatibility with low-voltage µP systems operating down to 1.2V.
Technical Context
The MAX6855UK45D2+T integrates voltage monitoring, manual reset control, and reset timing logic-without watchdog or CT functionality-making it a dedicated supervisor for systems where software-initiated reset is required but autonomous watchdog supervision is unnecessary. Its push-pull active-high RESET output drives directly to VCC, eliminating external pullup components and simplifying interface with µP reset inputs expecting high-asserted reset signals.
It operates across VCC = 1.2V to 5.5V and maintains guaranteed reset validity down to VCC = +1.1V, enabling robust operation during deep brownout conditions. The device's 170nA typical supply current and 0.5% reset threshold hysteresis support long battery life and stable reset release behavior in portable applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.500V ±2.5% - precisely matches 4.5V rail monitoring for SoC or PMIC power sequencing |
| Supply Current | 170nA typ at +25°C - enables >10-year battery life in always-on glucose monitors |
| Reset Timeout | 40ms min - ensures µP initialization completes before firmware execution begins |
| VCC Range | 1.2V to 5.5V - supports single-cell Li-ion, coin cell, and multi-rail embedded systems |
| Reset Output Type | Push-pull active-high - eliminates external pullup, reduces BOM count, and ensures fast rise/fall edges |
| Reset Valid Down To | VCC = +1.1V - guarantees deterministic reset assertion even during severe undervoltage events |
| MR Input Logic | Active-low with 10kΩ internal pullup - allows direct switch-to-GND connection without external biasing |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; sinks/source current per VOH/VOL specs; no external pullup needed |
| 2 | GND | Ground reference - must be connected to system ground plane for accurate threshold sensing and noise immunity |
| 3 | MR | Active-low manual reset input - initiates reset when pulled low; internally pulled up to VCC (10kΩ); accepts CMOS logic levels |
| 4 | GND | Second ground terminal - improves thermal dissipation and reduces ground bounce in noisy environments |
| 5 | VCC | Supply and monitored voltage input - powers device and serves as reset monitor source; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical - extends shelf life and runtime in battery-critical devices like patient monitors |
| No external components | Integrated MR pullup, precise threshold, and fixed timeout - eliminates discrete resistors/capacitors in reset circuitry |
| VCC transient immunity | Immune to ≤40µs transients at 100mV overdrive - prevents false resets in electrically noisy handheld equipment |
| Guaranteed reset validity | Valid down to VCC = +1.1V - ensures fail-safe behavior during deep brownout, unlike many supervisors failing at 1.2V |
| SOT23-5 footprint | Industry-standard 5-pin package - enables drop-in replacement and automated assembly on existing production lines |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 10+ days on single coin cell. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output powering sensor ADC and BLE radio; asserts RESET high during startup and brownout. Use Value: 170nA ICC preserves battery capacity; 4.5V threshold guards against PMIC rail collapse; 40ms timeout aligns with BLE stack initialization. |
Use Scenario: Portable ECG/SpO₂ logger recording data intermittently over 72-hour clinical deployment. IC Role / Device Role / Timing Role: Monitors main 1.8V core supply and triggers controlled restart if voltage sags below 1.71V during flash write. Use Value: Valid reset down to VCC = +1.1V ensures recovery even after deep discharge; MR pin enables clinician-initiated recalibration reset. |
| Industrial Handheld Scanners | Smart Wearable Sensors |
|
Use Scenario: Rugged barcode scanner powered by 3.7V Li-ion, subjected to motor-induced supply noise during trigger actuation. IC Role / Device Role / Timing Role: Provides glitch-immune reset supervision for ARM Cortex-M0 host MCU and image sensor interface. Use Value: Immunity to 40µs VCC transients prevents spurious resets during motor commutation; push-pull RESET ensures fast, clean MCU reset edge. |
Use Scenario: Fitness tracker with optical heart-rate sensor and Bluetooth LE, operating from 1.2V–3.6V battery range. IC Role / Device Role / Timing Role: Acts as primary power-on supervisor for ultra-low-power sensor hub ASIC, asserting reset until stable 1.8V rail is confirmed. Use Value: 1.2V minimum VCC operation enables use with buck-boost regulators; 4.5V threshold variant avoids false trips on lower rails. |
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 timeout, open-drain active-low output, 1.5µA ICC | Requires external pullup; higher current draw limits battery lifetime in multi-year devices | Select when 3.3V rail monitoring and legacy open-drain interface are required; not suitable for 4.5V rails or ultra-low-ICC designs |
| MAX6315US45D2+ | Same 4.5V threshold and 40ms timeout, but push-pull active-low RESET, 1.6µA ICC, SOT23-5 | Active-low logic conflicts with µPs requiring high-asserted reset; higher ICC reduces battery longevity | Choose only if board-level redesign accommodates active-low signaling and system can tolerate 10× higher quiescent current |
Compared with TPS3837K33DBVR and MAX6315US45D2+, the MAX6855UK45D2+T uniquely combines 4.5V precision threshold, active-high push-pull output, and nanopower 170nA operation-enabling longer battery life and simplified interface in 4.5V-supervised portable medical and industrial systems.
Availability
MAX6855UK45D2+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 RoHS-compliant lead-free packaging.
Supply support for MAX6855UK45D2+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 MAX685x family targets ultra-low-power microprocessor supervision in battery-constrained systems, emphasizing nanoscale current consumption, rail-specific threshold accuracy, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK45D2+T?
The MAX6855UK45D2+T has a factory-trimmed reset threshold of +4.500V 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 "45" corresponds to 4.500V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, and threshold hysteresis is 0.5% of VTH.
Does the MAX6855UK45D2+T include a watchdog timer function?
No, the MAX6855UK45D2+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides only voltage monitoring and manual reset (MR) functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants, identifiable by "S" or "L" suffixes in the ordering code. The MAX6855UK45D2+T pinout lacks WDI, confirming absence of watchdog circuitry.
What is the reset timeout period for the MAX6855UK45D2+T?
The MAX6855UK45D2+T has a 40ms minimum reset timeout period, indicated by the "D2" suffix in its part number. Per Table 4 (Reset Timeout Periods), D2 corresponds to 40ms (min), 60ms (typ), and 80ms (max). This timeout begins after VCC rises above the 4.5V threshold and MR is deasserted, ensuring sufficient hold time for µP initialization.
Is the MAX6855UK45D2+T pin-compatible with other SOT23-5 supervisors?
Yes, the MAX6855UK45D2+T uses the standard 5-pin SOT23-5 package with pin 1 = RESET, pins 2 & 4 = GND, pin 3 = MR, and pin 5 = VCC. It is pin-compatible with TPS3836/TPS3837/TPS3838 series per datasheet Feature list, though output polarity (active-high vs. active-low) and threshold values differ-requiring verification of reset logic compatibility in the target design.
What are the absolute maximum ratings for VCC and RESET pins on the MAX6855UK45D2+T?
The MAX6855UK45D2+T has an absolute maximum VCC rating of +6.0V (with respect to GND), and RESET pin voltage must stay within –0.3V to (VCC + 0.3V). Input/output current per pin is limited to ±20mA. Exceeding these ratings may cause permanent damage. Operating range remains VCC = 1.2V to 5.5V, and junction temperature must not exceed +150°C.
MAX6855UK45D2+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:
- 4.5V
- 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
MAX6855UK45D2+T FAQ
1.How can I place an order for MAX6855UK45D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK45D2+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 MAX6855UK45D2+T reliable?
The price and inventory of MAX6855UK45D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK45D2+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK45D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK45D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK45D2+T?
MAX6855UK45D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK45D2+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 MAX6855UK45D2+T?
For technical support, including MAX6855UK45D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK45D2+T requirements.
6.How does Aetrix verify that MAX6855UK45D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK45D2+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 MAX6855UK45D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK45D2+T?
All MAX6855UK45D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK45D2+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 MAX6855UK45D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK45D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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