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Analog Devices Inc./Maxim Integrated MAX6855UK39D4+T
- Part No.:
- MAX6855UK39D4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK39D4+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,074
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Product details
Overview
MAX6855UK39D4+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, 3.9V factory-trimmed reset threshold (±2.5%), 1200ms minimum reset timeout, manual reset input (MR), and immunity to VCC transients down to 1.1V. It monitors supply voltage during power-up/down/brownout in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK39D4+T datasheet, MAX6855UK39D4+T pinout, MAX6855UK39D4+T application, or MAX6855UK39D4+T equivalent, this page delivers verified functional identity, exact reset timing behavior, MR interface logic levels, guaranteed VCC = 1.1V reset validity, and lead-free SOT23-5 packaging compliance - all critical for low-power embedded system reliability validation.
Technical Context
The MAX6855UK39D4+T implements a precision bandgap-based voltage monitor with 2.5% threshold tolerance over -40°C to +85°C, coupled to a fixed 1200ms reset timeout timer that activates on VCC drop below 3.9V or MR assertion. Its active-high push-pull RESET output drives directly to VCC with VOH ≥ 0.8×VCC at ISOURCE = 500µA.
No watchdog timer or CT select input is present - confirmed by Selector Guide and Pin Description tables. The device lacks WDI and CT pins, distinguishing it from MAX6864–MAX6869 and MAX6861–MAX6863 variants, and operates exclusively with manual reset and voltage monitoring functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.900V (min), 3.998V (typ), 4.095V (max) - factory-trimmed for stable brownout detection at nominal 3.9V rail |
| Reset Timeout | 1200ms (min), 1800ms (typ), 2400ms (max) - ensures µP initialization completes before release |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Reset Output Type | Active-high push-pull - eliminates external pullup, supports direct connection to µP reset input |
| VCC Validity Range | Guaranteed RESET assertion down to VCC = 1.1V - maintains reset integrity during deep brownout |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC - accepts CMOS-level signals; no external bias required |
| Package | 5-pin SOT23-5, lead-free (RoHS-compliant) - surface-mount compatible with high-density PCB layouts |
Pinout & Package
MAX6855UK39D4+T uses a 5-pin SOT23-5 package with exposed pad (not electrically connected). Pin 1 is RESET (active-high push-pull), Pin 2 and Pin 4 are GND, Pin 3 is MR (active-low manual reset), and Pin 5 is VCC (supply voltage input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - asserts high during reset; sinks current when deasserted; referenced to VCC |
| 2 | GND | Ground reference - must connect to system ground plane for noise immunity and accurate threshold sensing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; driven low to force reset |
| 4 | GND | Second ground terminal - improves thermal dissipation and reduces ground loop impedance |
| 5 | VCC | Supply voltage input - monitored for reset trigger; bypass with 0.1µF capacitor to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in glucose monitors and wearables beyond 5 years |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy portable environments |
| Reset validity at low VCC | Guaranteed RESET assertion down to VCC = 1.1V - ensures reliable reset during deep brownout recovery |
| No external components | Self-contained supervision - requires only 0.1µF VCC bypass capacitor; no resistors or timing capacitors needed |
| Lead-free SOT23-5 | RoHS-compliant packaging - meets global environmental regulations without performance trade-offs |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous glucose sensing in handheld or wearable medical devices powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Voltage supervisor ensuring µP reset remains asserted until 3.3V rail stabilizes post-battery insertion or low-battery recovery. Use Value: 170nA quiescent current enables >7-year battery life; 3.9V threshold matches LiMnO₂ battery discharge profile. |
Use Scenario: Portable ECG or SpO₂ units operating from dual AA alkaline cells with variable voltage decay. IC Role / Device Role / Timing Role: Brownout detector asserting active-high RESET to ARM Cortex-M0+ during VCC sag below 3.9V. Use Value: 1200ms timeout guarantees full ADC calibration and memory initialization before µP release. |
| Industrial Handheld Terminals | Smart Asset Trackers |
|
Use Scenario: Ruggedized barcode scanners using intermittent GPS/Wi-Fi bursts causing supply droop. IC Role / Device Role / Timing Role: Manual reset initiator via front-panel button (MR pin), with glitch rejection filtering mechanical bounce. Use Value: 200ns MR glitch rejection eliminates false triggers; 10kΩ internal pullup removes external BOM cost. |
Use Scenario: LTE-M/NB-IoT trackers deployed in remote locations with infrequent firmware updates. IC Role / Device Role / Timing Role: Power-on supervisor validating 3.8V LiPo cell voltage before enabling modem boot sequence. Use Value: 3.9V threshold aligns with LiPo end-of-discharge; 1.1V VCC validity prevents reset release during cold-start failure. |
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 output, no MR input | Lacks manual reset and longer timeout - unsuitable for systems requiring field-initiated reset or extended initialization | Select only if 3.3V rail monitoring suffices and MR functionality is unnecessary |
| MAX6315US39D3+T | Same 3.9V threshold and 150ms timeout, but active-low open-drain output and no MR | Requires external pullup resistor; incompatible with µP reset inputs expecting active-high logic | Choose only for legacy designs using open-drain interfaces and where 150ms timeout is acceptable |
Compared with TPS3837K33DBVR and MAX6315US39D3+T, the MAX6855UK39D4+T uniquely combines 3.9V threshold, 1200ms timeout, active-high push-pull output, and MR support in a single 5-pin SOT23 - eliminating design compromises in battery-critical medical and industrial edge devices.
Availability
MAX6855UK39D4+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, industrial handheld terminals, and smart asset trackers requiring stable component supply across long product lifecycles.
Supply support for MAX6855UK39D4+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 MAX6855UK39D4+T belongs to the MAX6854–MAX6869 nanopower supervisory family, engineered specifically for ultra-low-current battery-powered systems where reset reliability and longevity are non-negotiable.
FAQ
What is the exact reset threshold voltage of MAX6855UK39D4+T?
The MAX6855UK39D4+T has a factory-trimmed reset threshold of 3.900V (minimum), 3.998V (typical), and 4.095V (maximum) with ±2.5% tolerance over temperature. This corresponds to the "39" suffix in the part number per Table 2 (Threshold Suffix Guide), confirming its precise 3.9V nominal trip point for stable brownout detection in 3.3V/3.8V systems.
Does MAX6855UK39D4+T include a watchdog timer function?
No, MAX6855UK39D4+T does not include a watchdog timer. Per the Selector Guide and Pin Configuration diagrams, it lacks the WDI pin and associated watchdog circuitry found only in MAX6864–MAX6869 variants. Its functionality is strictly limited to voltage monitoring, manual reset (MR), and fixed 1200ms reset timeout.
What is the reset output type and drive capability of MAX6855UK39D4+T?
MAX6855UK39D4+T features an active-high push-pull RESET output. When asserted, it drives high to VCC; when deasserted, it pulls low with VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V). This eliminates need for external pullup resistors and ensures direct compatibility with µP reset inputs requiring active-high logic.
Can MAX6855UK39D4+T operate reliably below 1.8V supply voltage?
Yes, MAX6855UK39D4+T guarantees valid reset assertion down to VCC = 1.1V, as specified in Electrical Characteristics. Its 170nA typical supply current at VCC = 1.8V and functional operation at 1.2V minimum enable use in deeply brownout-prone battery systems, such as end-of-life LiMnO₂ or alkaline cells.
Is MAX6855UK39D4+T pin-compatible with other MAX68xx supervisory devices?
MAX6855UK39D4+T shares the same 5-pin SOT23-5 footprint and pinout (RESET/MR/GND/GND/VCC) with MAX6854, MAX6856, MAX6861–MAX6863, and MAX6864–MAX6869. However, pin compatibility does not imply functional equivalence - MR is present but WDI and CT pins are absent, and RESET polarity/output type differs across variants.
MAX6855UK39D4+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:
- 3.9V
- 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
MAX6855UK39D4+T FAQ
1.How can I place an order for MAX6855UK39D4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK39D4+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 MAX6855UK39D4+T reliable?
The price and inventory of MAX6855UK39D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK39D4+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK39D4+T?
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4.How is shipping managed for MAX6855UK39D4+T?
MAX6855UK39D4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK39D4+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 MAX6855UK39D4+T?
For technical support, including MAX6855UK39D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK39D4+T requirements.
6.How does Aetrix verify that MAX6855UK39D4+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK39D4+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 MAX6855UK39D4+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK39D4+T?
All MAX6855UK39D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK39D4+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 MAX6855UK39D4+T part is unused and in its original packaging.
Return procedure for MAX6855UK39D4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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