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Analog Devices Inc./Maxim Integrated MAX6855UK41D1+T
- Part No.:
- MAX6855UK41D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK41D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,352
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Product details
Overview
The MAX6855UK41D1+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 4.100V reset threshold with 10ms minimum reset timeout. It monitors VCC supply integrity, asserts reset during brownout or manual trigger, and guarantees valid reset operation down to VCC = +1.1V. It is designed for ultra-low-power portable systems where supply stability and deterministic reset timing are critical.
For engineers reviewing the MAX6855UK41D1+T datasheet, MAX6855UK41D1+T pinout, MAX6855UK41D1+T application, or MAX6855UK41D1+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in battery-powered medical and consumer devices, and validated alternative options with documented functional differences.
Technical Context
The MAX6855UK41D1+T implements a voltage-monitoring comparator with ±2.5% threshold accuracy over temperature, a 10ms minimum reset timeout timer, and an internally pulled-up MR input (10kΩ). It lacks watchdog timer and CT select functionality - distinguishing it from MAX6864–MAX6869 and MAX6861–MAX6863 variants.
Its active-high push-pull RESET output drives high when VCC falls below 4.100V or MR is asserted low, remaining high for ≥10ms after VCC exceeds threshold and MR deasserts. Supply current is 170nA (typ) at VCC = 1.8V, enabling multi-year operation on coin-cell batteries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.100V (factory-trimmed, ±2.5% tolerance) - ensures reliable detection of VCC drop below safe µP operating voltage. |
| Reset Timeout | 10ms (minimum) - provides sufficient hold time for µP power stabilization before release. |
| Supply Current | 170nA typical at VCC = 1.8V - enables >10-year battery life in always-on glucose monitors or pagers. |
| Operating Voltage Range | 1.2V to 5.5V - supports single-cell Li-ion, alkaline, or NiMH battery systems without external regulation. |
| Reset Validity Limit | Guaranteed to VCC = +1.1V - ensures reset assertion remains valid deep into brownout conditions. |
| MR Input Pullup | 10kΩ internal - eliminates need for external resistor; allows direct connection to open-drain logic or momentary switch to GND. |
| Output Type | Active-high push-pull - directly interfaces with µP reset inputs requiring high-true assertion without pullup. |
Pinout & Package
Package: 5-pin SOT23 (lead-free, RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output driven high during reset condition; sinks current only during transition; no external pullup required. |
| 2 | GND | Ground reference for all internal circuitry and reset timing; must be connected to system ground plane. |
| 3 | MR (active-low) | Manual reset input; internally pulled up to VCC (10kΩ); assert by pulling low; immune to <200ns glitches. |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in high-frequency layouts. |
| 5 | VCC | Primary supply input monitored for reset generation; requires 0.1µF bypass capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical - reduces quiescent power in always-on wearables and remote sensors. |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C - eliminates need for calibration in production test across temperature. |
| No external components | Self-contained supervision - removes BOM cost and layout area for RC networks or discrete comparators. |
| Immunity to short VCC transients | Rejects ≤40µs transients at 100mV overdrive - prevents spurious resets in noisy DC-DC converter environments. |
| Valid reset to 1.1V | Ensures µP remains held in reset until supply recovers beyond minimum functional voltage. |
Applications
| Portable Glucose Monitors | Medical Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises VCC during battery discharge curve; asserts active-high RESET to halt MCU if voltage drops below 4.100V. Use Value: Prevents corrupted sensor readings or unsafe BLE transmissions during brownout, leveraging 170nA ICC to extend battery life beyond 2 years. |
Use Scenario: Portable ECG monitor with dual-supply analog front-end and low-power ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Monitors main 3.3V rail; triggers active-high reset on undervoltage or user-initiated MR press. Use Value: Guarantees clean MCU restart at VCC ≥ 1.1V, avoiding metastability in ADC clock domain during partial power loss. |
| MP3 Audio Players | PDA Power Management |
Use Scenario: Flash-based audio player using single 3.7V Li-ion cell with buck-boost regulator feeding 1.8V/3.3V rails. IC Role / Device Role / Timing Role: Resets audio codec and MCU when regulated 3.3V rail sags below 4.100V due to load transients. Use Value: Eliminates audio artifacts or lockup via deterministic 10ms reset hold, enabled by push-pull output driving high without pullup. |
Use Scenario: Legacy PDA with aging battery and variable load causing intermittent VCC droop during touchscreen activity. IC Role / Device Role / Timing Role: Provides manual reset via tactile button (MR) and automatic reset on VCC sag to 4.100V. Use Value: Reduces field returns by preventing firmware hangs caused by marginal supply conditions, with MR glitch rejection (<200ns). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK41D1+T | Active-low push-pull RESET output; identical threshold (4.100V), timeout (10ms), and ICC (170nA). | Requires µP with active-low reset input; incompatible with active-high reset pin without level-shifting. | Select when target µP uses active-low reset assertion and board layout already accommodates inverted logic. |
| TPS3836K33DBVR | 3.3V fixed threshold (not adjustable), 200ms min timeout, 1.2µA ICC - 7× higher quiescent current than MAX6855UK41D1+T. | Suitable for non-battery-critical industrial controllers; not viable for multi-year coin-cell operation. | Choose only if 3.3V threshold matches system rail and higher ICC is acceptable; verify compatibility with MR timing specs. |
Compared with MAX6854UK41D1+T, the MAX6855UK41D1+T enables direct interface to active-high reset pins without inversion logic; versus TPS3836K33DBVR, it delivers 7× lower ICC and programmable threshold selection across 1.575V–4.625V, making it superior for long-life portable designs.
Availability
MAX6855UK41D1+T is available at Aetrix Electronics and suitable for portable glucose monitors, medical patient monitors, MP3 players, and PDA power management systems requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6855UK41D1+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 high-performance analog, mixed-signal, and power management ICs for industrial, medical, and portable applications.
The MAX6854–MAX6869 family was designed specifically for nanopower microprocessor supervision in battery-constrained systems, emphasizing ultra-low ICC, guaranteed reset validity at sub-1.2V VCC, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6855UK41D1+T?
The MAX6855UK41D1+T has a factory-trimmed reset threshold of 4.100V, 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 "41" corresponds to 4.100V nominal. The MAX6855UK41D1+T does not support adjustment or external programming of this threshold.
Does the MAX6855UK41D1+T include a watchdog timer function?
No, the MAX6855UK41D1+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, as clearly indicated in the Selector Guide and Pin Description sections of the datasheet.
What is the function of Pin 4 on the MAX6855UK41D1+T?
Pin 4 on the MAX6855UK41D1+T is a second GND terminal, electrically connected to Pin 2 internally. Its inclusion improves noise immunity and thermal performance in the 5-pin SOT23 package. Unlike variants such as MAX6864 or MAX6867, Pin 4 is not repurposed as WDI or CT - it serves solely as a dedicated ground path per the MAX6854/MAX6855/MAX6856 pinout diagram.
Can the MAX6855UK41D1+T operate with a 1.2V supply?
Yes, the MAX6855UK41D1+T operates with VCC as low as 1.2V, and its reset output remains valid down to VCC = +1.1V. However, the 4.100V reset threshold means it will assert reset immediately when powered from 1.2V - so it is intended to monitor higher rails (e.g., 3.3V or 4.2V battery systems), not to be powered from the same rail it supervises below 4.1V.
Is the MAX6855UK41D1+T pin-compatible with the TPS3836 series?
No, the MAX6855UK41D1+T is not pin-compatible with the TPS3836 series. While the datasheet notes "pin compatible to the TPS3836/TPS3837/TPS3838" for MAX6861–MAX6863 only, the MAX6855UK41D1+T uses a different pinout: RESET on Pin 1 (active-high), GND on Pins 2 & 4, MR on Pin 3, and VCC on Pin 5. TPS3836 devices place RESET on Pin 1 (active-low) and lack the dual-GND configuration.
MAX6855UK41D1+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:
- 4.1V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK41D1+T FAQ
1.How can I place an order for MAX6855UK41D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK41D1+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 MAX6855UK41D1+T reliable?
The price and inventory of MAX6855UK41D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK41D1+T is usually 5 days.
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MAX6855UK41D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK41D1+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 MAX6855UK41D1+T?
For technical support, including MAX6855UK41D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK41D1+T requirements.
6.How does Aetrix verify that MAX6855UK41D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK41D1+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 MAX6855UK41D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK41D1+T?
All MAX6855UK41D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK41D1+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 MAX6855UK41D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK41D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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