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Analog Devices Inc./Maxim Integrated MAX6855UK17D2+T
- Part No.:
- MAX6855UK17D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK17D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,804
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Product details
Overview
MAX6855UK17D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull RESET output, 1.665V factory-trimmed reset threshold (suffix '17'), 40ms minimum reset timeout (suffix 'D2'), and manual reset input (MR). It monitors VCC supply integrity, asserts reset during brownout or MR activation, and guarantees valid reset down to VCC = +1.1V - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6855UK17D2+T datasheet, MAX6855UK17D2+T pinout, MAX6855UK17D2+T application, or MAX6855UK17D2+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters, real-world use context, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX6855UK17D2+T implements a precision voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C, coupled with a fixed 40ms minimum reset timeout after VCC recovery or MR deassertion. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load when asserted.
It includes an internally 10kΩ-pulled-up MR input with 1µs minimum pulse width support and 200ns glitch rejection. Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6855UK17D2+T lacks WDI functionality and CT select input - confirming its role as a dedicated voltage-monitoring + manual-reset supervisor without programmable timeout or watchdog features.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.665V (factory-trimmed, ±2.5% tolerance) - ensures reliable detection of VCC drop below safe operating level for 1.8V logic systems. |
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries in always-on patient monitors. |
| Reset Timeout | 40ms minimum (D2 option) - provides sufficient hold time for µP power stabilization and register initialization after brownout recovery. |
| Operating Voltage | 1.2V to 5.5V - supports direct monitoring of 1.8V, 2.5V, 3.3V, and 5V rails without external level-shifting. |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and drives high-impedance µP reset inputs directly. |
| VCC Validity Range | Guaranteed RESET validity down to VCC = +1.1V - ensures deterministic reset behavior during deep brownout conditions. |
| MR Input Behavior | Internally pulled up to VCC via 10kΩ; accepts CMOS logic levels; 250ns MR-to-RESET delay - simplifies manual reset switch interface with no external components. |
Pinout & Package
Package: 5-pin SOT23-5 (lead-free, +T suffix), footprint-compatible with industry-standard 5-lead SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset input high during fault; requires no external pullup; referenced to VCC. |
| 2 | GND | Ground reference for all internal circuitry and reset assertion logic - must be connected to system ground plane. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); assert low ≥1µs to trigger reset; immune to <200ns noise spikes. |
| 4 | GND | Second ground terminal - improves noise immunity and thermal dissipation; must be tied to same ground potential as Pin 2. |
| 5 | VCC | Supply voltage input and monitored rail - bypass with 0.1µF ceramic capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in portable medical devices beyond 5 years on CR2032. |
| Reset Threshold Accuracy | ±2.5% over full temperature range - eliminates need for external calibration in field-deployed equipment. |
| No External Components | Integrated MR pullup, precision voltage reference, and timeout timer - reduces BOM count and PCB area by ≥3 passives. |
| Brownout Immunity | Valid RESET assertion down to VCC = +1.1V - prevents spurious release during slow power-down sequences. |
| Transient Rejection | Immune to VCC glitches ≤40µs at 100mV overdrive - avoids false resets in electrically noisy industrial handhelds. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose meters powered by single CR2032 coin cell, operating unattended for >12 months. IC Role / Device Role / Timing Role: Supervises 1.8V analog front-end and BLE SoC supply; asserts active-high RESET to halt ADC sampling and radio transmission during brownout. Use Value: 170nA quiescent current directly extends usable battery life by 22 months versus 500nA alternatives; 1.665V threshold matches LDO dropout margin. |
Use Scenario: Portable ECG/SpO₂ units with auto-wake on button press and sleep mode between measurements. IC Role / Device Role / Timing Role: Monitors main 3.3V rail powering MCU and sensor interface; triggers reset if VCC dips below 1.665V during battery swap or cold start. Use Value: 40ms reset timeout ensures complete MCU core initialization before sensor firmware execution; push-pull output eliminates pullup resistor (saving 0.2mm² PCB area). |
| Handheld Diagnostic Tools | Wearable Health Sensors |
|
Use Scenario: Battery-operated ultrasound probes requiring guaranteed boot integrity after intermittent charging cycles. IC Role / Device Role / Timing Role: Acts as primary power-good detector for 2.5V FPGA configuration rail; asserts RESET until stable post-charge condition is confirmed. Use Value: Guaranteed operation down to VCC = +1.1V prevents partial configuration lockup; MR pin enables technician-initiated recalibration reset without power cycle. |
Use Scenario: Disposable patch sensors with 10-year shelf life and 3-month operational life on thin-film battery. IC Role / Device Role / Timing Role: Provides fail-safe reset for ultra-low-power ARM Cortex-M0+ during storage voltage decay and first-power-up sequencing. Use Value: Factory-trimmed 1.665V threshold aligns precisely with battery end-of-life voltage (1.65V), enabling graceful shutdown instead of undefined state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK17D2+T | Active-low open-drain RESET output; requires external pullup resistor; identical threshold (1.665V), timeout (40ms), and ICC (170nA). | Suitable where µP reset input is active-low and system already uses pullup on shared reset bus. | Select when interfacing to legacy µPs with active-low reset pins and existing pullup infrastructure. |
| TPS3837K33DBVR | 1.68V threshold (±0.5%), 200nA ICC, 200ms min timeout, SOT23-5 - no MR input; fixed timeout only. | Used in cost-sensitive consumer wearables where manual reset is unnecessary and longer timeout is acceptable. | Choose for simplified designs omitting manual reset; verify 200ms timeout meets µP initialization requirements. |
Compared with MAX6854UK17D2+T, the MAX6855UK17D2+T saves one external component and reduces board space, while TPS3837K33DBVR trades MR flexibility and lower ICC for tighter threshold tolerance and higher integration - making each suitable for distinct subsystem constraints.
Availability
MAX6855UK17D2+T is available at Aetrix Electronics and suitable for portable medical diagnostics, battery-powered patient monitors, and handheld health sensors requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK17D2+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 demanding industrial, medical, and communications applications.
The MAX685x family delivers nanopower supervisory functions targeting ultra-long-life battery-operated equipment where supply integrity, minimal current draw, and guaranteed reset behavior under brownout are critical design requirements.
FAQ
What is the exact reset threshold voltage of the MAX6855UK17D2+T?
The MAX6855UK17D2+T has a factory-trimmed reset threshold of 1.665V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix '17' corresponds to 1.623V (min), 1.665V (typ), and 1.707V (max). The 1.665V typ ensures compatibility with 1.8V logic systems experiencing nominal 10% rail droop.
Does the MAX6855UK17D2+T include a watchdog timer function?
No, the MAX6855UK17D2+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input; the MAX6855UK17D2+T belongs to the MAX6854/MAX6855/MAX6856 group, which provides voltage monitoring and manual reset only. Its pinout omits WDI, and functional diagrams confirm absence of watchdog circuitry.
What is the function of Pin 1 on the MAX6855UK17D2+T?
Pin 1 of the MAX6855UK17D2+T is the active-high push-pull RESET output. As specified in the MAX6854/MAX6855/MAX6856 Pin Description table, it transitions from low to high when VCC drops below the 1.665V threshold or MR is pulled low, and remains high for the 40ms reset timeout period after VCC recovers and MR deasserts. It is referenced to VCC and requires no external pullup.
Can the MAX6855UK17D2+T operate with a 1.2V supply voltage?
Yes, the MAX6855UK17D2+T operates with VCC as low as 1.2V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Its reset output remains valid down to VCC = +1.1V, and supply current is characterized from 1.2V upward. However, the 1.665V reset threshold means it will assert reset continuously below that voltage - making it suitable for monitoring rails ≥1.8V, not for regulating 1.2V cores.
How does the manual reset (MR) input behave on the MAX6855UK17D2+T?
The MR input on the MAX6855UK17D2+T is active-low, internally pulled up to VCC via 10kΩ, and requires a minimum 1µs low pulse to initiate reset. Reset remains asserted while MR is held low and for the full 40ms timeout after MR returns high. Glitch rejection is rated at 200ns, and MR-to-RESET delay is 250ns - enabling robust switch debouncing without external RC networks.
MAX6855UK17D2+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:
- 1.665V
- 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
MAX6855UK17D2+T FAQ
1.How can I place an order for MAX6855UK17D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK17D2+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 MAX6855UK17D2+T reliable?
The price and inventory of MAX6855UK17D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK17D2+T is usually 5 days.
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Once your MAX6855UK17D2+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 MAX6855UK17D2+T?
For technical support, including MAX6855UK17D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK17D2+T requirements.
6.How does Aetrix verify that MAX6855UK17D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK17D2+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 MAX6855UK17D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK17D2+T?
All MAX6855UK17D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK17D2+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 MAX6855UK17D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK17D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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