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Analog Devices Inc./Maxim Integrated MAX6855UK25D3+T
- Part No.:
- MAX6855UK25D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK25D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,850
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Product details
Overview
The MAX6855UK25D3+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 2.5V reset threshold with 150ms minimum reset timeout. It monitors VCC for brownout detection, asserts reset during power-up/down, and guarantees valid reset operation down to VCC = +1.1V - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6855UK25D3+T datasheet, MAX6855UK25D3+T pinout, MAX6855UK25D3+T application, or MAX6855UK25D3+T equivalent, key selection criteria include its ultra-low 170nA typical supply current, immunity to short VCC transients, push-pull active-high RESET logic compatibility, and guaranteed reset validity at low supply voltages.
Technical Context
This device implements a precision voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, combined with a fixed 150ms minimum reset timeout (D3 option) and internal 10kΩ MR pullup. It lacks watchdog timer or CT select functionality - distinguishing it from MAX6864–MAX6869 and MAX6861–MAX6863 variants.
The active-high push-pull RESET output drives high when VCC falls below 2.5V or MR is asserted, remaining high for ≥150ms after VCC exceeds threshold and MR deasserts. Output voltage meets VOH ≥ 0.8×VCC (ISOURCE = 500µA, VCC ≥ 2.38V), ensuring reliable µP reset signaling across 1.2V–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.5V ±2.5% - precisely matches 2.5V system rails; ensures deterministic reset assertion during brownout |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in always-on portable medical sensors |
| Reset Timeout | 150ms (min) - provides sufficient hold time for slow-starting µPs and peripheral initialization |
| Operating Voltage | 1.2V to 5.5V - supports Li-ion, coin-cell, and multi-rail embedded systems without external regulation |
| Reset Validity | Guaranteed to VCC = +1.1V - maintains functional reset assertion deeper into power collapse than most competitors |
| MR Input | Active-low, internally pulled up to VCC (10kΩ) - simplifies manual reset implementation with momentary switch to GND |
| Output Type | Push-pull active-high RESET - eliminates need for external pullup; directly interfaces with µP reset inputs requiring high-active logic |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (+T suffix), footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output driven high during reset assertion; sinks no current when deasserted; referenced to VCC |
| 2 | GND | Power ground reference for all internal circuitry and reset timing; must be low-impedance connection |
| 3 | MR (active-low) | Manual reset trigger input; internally pulled up to VCC (10kΩ); requires <0.3×VCC to assert reset |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in high-frequency environments |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF capacitor to GND for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell-powered wearables |
| Reset threshold accuracy | ±2.5% over full temperature range ensures consistent brownout response across industrial environments |
| No external components | Integrated MR pullup, precision voltage reference, and timeout generator eliminate BOM cost and layout area |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy automotive/industrial power rails |
| Low-VCC reset validity | Functional reset assertion guaranteed down to VCC = +1.1V - critical for safe shutdown in deep brownout conditions |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing in handheld or wearable units with coin-cell power and strict low-power requirements. IC Role / Device Role / Timing Role: Supervises MCU power rail and initiates controlled reset on battery sag or sensor fault, using active-high RESET to match µP reset pin polarity. Use Value: 170nA quiescent current extends single-CR2032 battery life beyond 3 years; 150ms timeout ensures ADC and RF subsystems fully initialize before firmware execution. |
Use Scenario: Portable ECG or SpO₂ monitors operating from rechargeable Li-ion batteries with variable voltage profiles. IC Role / Device Role / Timing Role: Monitors main 3.3V domain and asserts reset if voltage drops below 2.5V during discharge or load transients. Use Value: Guaranteed reset validity to VCC = +1.1V prevents undefined MCU state during deep discharge; dual-GND pins reduce ground bounce in analog front-end circuits. |
| MP3 Players | PDAs / Handheld Terminals |
Use Scenario: Flash-based audio players with cold-start requirements and frequent power cycling. IC Role / Device Role / Timing Role: Provides clean power-on reset and brownout protection for ARM Cortex-M0 host MCU and NAND controller. Use Value: Active-high push-pull RESET eliminates external pullup resistor, reducing component count and PCB area; 2.5V threshold aligns with common LDO output rails. |
Use Scenario: Ruggedized field terminals powered by removable Li-ion packs subject to voltage droop under RF transmit loads. IC Role / Device Role / Timing Role: Acts as primary system supervisor, asserting reset on VCC dip during GSM burst transmission or barcode scanning. Use Value: Immunity to 40µs transients prevents false resets during wireless communication; MR pin allows hardware-initiated recovery via front-panel button. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK25D3+T | Active-low push-pull RESET output; identical threshold, timeout, and supply current | Requires µP with active-low reset input; incompatible with active-high reset pin architectures | Select when interfacing with legacy MCUs requiring low-active reset assertion |
| TPS3837K25DBVR | 2.5V threshold, 200ms timeout, 1.2µA ICC - 7× higher supply current; SOT23-5 pinout | Higher ICC limits use in multi-year battery applications; same MR and VCC pin functions | Choose only if MAX6855UK25D3+T is unavailable and system can tolerate increased leakage |
Compared with MAX6854UK25D3+T and TPS3837K25DBVR, the MAX6855UK25D3+T uniquely delivers active-high reset logic with nanopower consumption - enabling direct interface to modern low-voltage µPs while preserving battery lifetime in portable medical electronics.
Availability
MAX6855UK25D3+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, MP3 players, and PDAs requiring stable component supply with long-term lifecycle support and lead-free compliance.
Supply support for MAX6855UK25D3+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 consumer markets.
The MAX6854–MAX6869 family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanoscale current consumption, robust reset timing, and wide supply voltage operation.
FAQ
What is the reset threshold voltage of the MAX6855UK25D3+T?
The MAX6855UK25D3+T has a factory-trimmed reset threshold of 2.5V with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) where suffix "25" corresponds to 2.500V nominal. The MAX6855UK25D3+T uses this exact threshold to ensure reliable brownout detection in 2.5V-rail systems without external calibration.
Does the MAX6855UK25D3+T include a watchdog timer?
No, the MAX6855UK25D3+T does not include a watchdog timer. Per the Selector Guide and Pin Description tables, only MAX6864–MAX6869 and MAX6867–MAX6869 variants feature WDI inputs. The MAX6855UK25D3+T is a dedicated voltage monitor with manual reset (MR) and fixed reset timeout - confirmed by absence of WDI pin and watchdog-related electrical specs in its parameter tables.
What is the function of Pin 1 on the MAX6855UK25D3+T?
Pin 1 of the MAX6855UK25D3+T is the active-high push-pull RESET output. As documented in the MAX6854/MAX6855/MAX6856 Pin Description table, this pin drives high when VCC drops below 2.5V or MR is asserted, and remains high for ≥150ms after recovery. It is not open-drain or active-low - distinguishing it from MAX6854 and MAX6856 variants in the same family.
What is the minimum supply voltage at which MAX6855UK25D3+T guarantees reset functionality?
The MAX6855UK25D3+T guarantees valid reset assertion down to VCC = +1.1V, as explicitly stated in the Features list and Electrical Characteristics table under "Guaranteed Reset Valid to VCC = +1.1V". This specification ensures fail-safe behavior during deep brownout conditions where other supervisors may release reset prematurely.
Is the MAX6855UK25D3+T pin-compatible with other parts in the MAX6854–MAX6869 family?
The MAX6855UK25D3+T shares the same 5-pin SOT23-5 package and pinout as MAX6854 and MAX6856, but differs functionally at Pin 1: MAX6855UK25D3+T outputs active-high RESET, while MAX6854 outputs active-low push-pull and MAX6856 outputs active-low open-drain. Thus, it is mechanically pin-compatible but not functionally interchangeable without circuit review.
MAX6855UK25D3+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:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK25D3+T FAQ
1.How can I place an order for MAX6855UK25D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK25D3+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 MAX6855UK25D3+T reliable?
The price and inventory of MAX6855UK25D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK25D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK25D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK25D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK25D3+T?
MAX6855UK25D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK25D3+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 MAX6855UK25D3+T?
For technical support, including MAX6855UK25D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK25D3+T requirements.
6.How does Aetrix verify that MAX6855UK25D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK25D3+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 MAX6855UK25D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK25D3+T?
All MAX6855UK25D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK25D3+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 MAX6855UK25D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK25D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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