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Analog Devices Inc./Maxim Integrated MAX6855UK25D4+T
- Part No.:
- MAX6855UK25D4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK25D4+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,085
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Product details
Overview
The MAX6855UK25D4+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing ultra-low 170nA typical supply current, factory-trimmed 2.5V reset threshold (±2.5%), and 1200ms minimum reset timeout period. It features active-low push-pull reset output, manual reset input (MR), and operates across -40°C to +85°C for reliable power-up/brownout monitoring in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK25D4+T datasheet, MAX6855UK25D4+T pinout, MAX6855UK25D4+T application, or MAX6855UK25D4+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients, no external components requirement, and compatibility with CMOS-level MR signaling in space-constrained embedded systems.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and reset timing control into a single BiCMOS IC. Its internal comparator continuously monitors VCC against a precision bandgap-derived 2.5V threshold, triggering reset when VCC falls below that level or when MR is pulled low.
The reset output remains asserted for a fixed 1200ms minimum timeout after VCC rises above threshold and MR deasserts. The push-pull active-low RESET output is referenced to VCC and sinks up to 1.2mA at VCC ≥ 2.38V, ensuring robust interface with µP reset inputs without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V; enables multi-year battery life in always-on portable devices. |
| Reset Threshold | 2.5V ±2.5% (factory-trimmed); ensures precise brownout detection for 2.5V logic domains. |
| Reset Timeout | 1200ms minimum (D4 option); provides sufficient hold time for slow-starting peripherals and firmware initialization. |
| Reset Output Type | Active-low push-pull; eliminates need for external pullup resistor and supports direct µP reset pin drive. |
| VCC Operating Range | 1.2V to 5.5V; supports wide-input battery and regulator-supplied systems including Li-ion and coin-cell applications. |
| Reset Validity Limit | Guaranteed to VCC = +1.1V; maintains deterministic reset state during deep brownout conditions. |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC; simplifies manual reset implementation using momentary switch to GND. |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; drives µP reset pin directly; valid down to VCC = 1.1V. |
| 2 | GND | Ground reference for all internal circuitry and reset output sink path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS logic levels. |
| 4 | GND | Second ground terminal; improves noise immunity and thermal performance in high-density layouts. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year operation on CR2032 coin cells in sleep-mode systems. |
| No external components | Self-contained supervision eliminates discrete resistors, capacitors, or comparators-reducing BOM count and PCB area. |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive; prevents spurious resets in electrically noisy environments. |
| Guaranteed reset validity | RESET output remains functional and well-defined down to VCC = +1.1V, critical for low-voltage brownout recovery. |
| SOT23-5 footprint | Industry-standard 5-pin SOT23 package enables drop-in replacement and compatibility with existing pick-and-place workflows. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous glucose sensing in wearable patch pumps requiring multi-year battery life and fail-safe power sequencing. IC Role / Device Role / Timing Role: Supervises 2.5V analog front-end and BLE SoC power rails; asserts reset during battery voltage sag to prevent corrupted sensor readings. Use Value: 170nA quiescent current extends CR2032 battery life beyond 3 years; 1200ms timeout ensures full ADC calibration completes before µP release. |
Use Scenario: Portable ECG/SpO₂ units powered by rechargeable Li-ion batteries operating in clinical and home settings. IC Role / Device Role / Timing Role: Monitors main 3.3V system rail and triggers hard reset if VCC drops below 2.5V during rapid discharge or cold-temperature operation. Use Value: Guaranteed reset validity to VCC = +1.1V prevents undefined µP behavior during deep brownout; MR pin allows clinician-initiated system reboot via front-panel button. |
| MP3 Players | PDAs |
Use Scenario: Flash-based audio players with NAND storage and low-power DSP, frequently subjected to mechanical shock-induced power interruptions. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for ARM9 host processor and audio codec; MR pin enables user-triggered soft reset. Use Value: Immunity to short VCC transients avoids false resets during headphone plug insertion or button press-induced supply noise. |
Use Scenario: Legacy handheld PDAs with 2.5V core logic and SRAM retention, deployed in field service and logistics tracking. IC Role / Device Role / Timing Role: Supervises 2.5V VCC rail and coordinates reset timing between application processor and real-time clock subsystem. Use Value: Factory-trimmed 2.5V threshold matches exact core voltage tolerance; push-pull RESET eliminates external pullup, saving board space in compact form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K25DBVR | 2.5V threshold, 1200ms timeout, open-drain RESET, 1.2µA ICC - higher supply current than MAX6855UK25D4+T. | Requires external pullup resistor; less suitable for ultra-low-power coin-cell designs where every nanoamp matters. | Select when open-drain flexibility is needed for mixed-voltage reset bus interfacing, not for nanopower optimization. |
| MAX6315US25D3+ | 2.5V threshold, 150ms timeout, push-pull active-low RESET, 1.5µA ICC - shorter timeout and higher ICC than MAX6855UK25D4+T. | Limited to fast-reset applications like digital logic sequencers; insufficient hold time for bootloader or flash initialization. | Choose only if system reset timing budget is <200ms and 1.5µA ICC is acceptable - not for long-timer or battery-critical use. |
Compared with TPS3836K25DBVR and MAX6315US25D3+, the MAX6855UK25D4+T uniquely delivers 170nA ICC with 1200ms timeout and push-pull RESET in SOT23-5, making it the only choice for multi-year battery life in 2.5V brownout-critical medical wearables.
Availability
MAX6855UK25D4+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and MP3 players requiring stable component supply, long-lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for MAX6855UK25D4+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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, medical, and portable applications.
The MAX685x family was designed specifically for ultra-low-power microprocessor supervision in battery-constrained medical and consumer electronics, emphasizing nanoscale ICC, guaranteed low-VCC reset validity, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK25D4+T?
The MAX6855UK25D4+T has a factory-trimmed reset threshold of 2.500V with ±2.5% tolerance over temperature (-40°C to +85°C), corresponding to the "25" suffix in the part number per Maxim's Threshold Suffix Guide. This value is laser-trimmed during production and does not require external calibration.
Does the MAX6855UK25D4+T include a watchdog timer function?
No, the MAX6855UK25D4+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 series, which provide voltage monitoring and manual reset only. Watchdog functionality is present only in MAX6864–MAX6869 variants, identifiable by "S" or "L" suffixes in the ordering code.
What is the meaning of the "D4" in MAX6855UK25D4+T?
The "D4" suffix in MAX6855UK25D4+T specifies the reset timeout period: D4 corresponds to a minimum 1200ms reset timeout (typical 1800ms, max 2400ms), as defined in Table 4 of the datasheet. This ensures sufficient reset assertion time for slow-booting peripherals and firmware initialization sequences.
Can the MAX6855UK25D4+T operate with VCC below 1.8V?
Yes, the MAX6855UK25D4+T operates with VCC as low as 1.2V and guarantees valid reset output down to VCC = +1.1V. At VCC = 1.2V, supply current is 190nA (typ), and RESET remains functional with VOL ≤ 0.3V at ISINK = 50µA, enabling reliable brownout handling in ultra-low-voltage systems.
Is the MAX6855UK25D4+T pin-compatible with other MAX685x devices?
Yes, the MAX6855UK25D4+T shares the identical 5-pin SOT23-5 pinout with all MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869 devices. Pin 1 is RESET, pins 2 & 4 are GND, pin 3 is MR, and pin 5 is VCC - enabling layout reuse across the family when functional requirements align.
MAX6855UK25D4+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:
- 2.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK25D4+T FAQ
1.How can I place an order for MAX6855UK25D4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK25D4+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 MAX6855UK25D4+T reliable?
The price and inventory of MAX6855UK25D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK25D4+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK25D4+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK25D4+T transactions.
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4.How is shipping managed for MAX6855UK25D4+T?
MAX6855UK25D4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK25D4+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 MAX6855UK25D4+T?
For technical support, including MAX6855UK25D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK25D4+T requirements.
6.How does Aetrix verify that MAX6855UK25D4+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK25D4+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 MAX6855UK25D4+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK25D4+T?
All MAX6855UK25D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK25D4+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 MAX6855UK25D4+T part is unused and in its original packaging.
Return procedure for MAX6855UK25D4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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