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Analog Devices Inc./Maxim Integrated MAX6855UK30D2+T
- Part No.:
- MAX6855UK30D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK30D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,515
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Product details
Overview
The MAX6855UK30D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.000V reset threshold (±2.5%), and 40ms minimum reset timeout period. It provides active-low push-pull reset output, manual reset input (MR), and operates across -40°C to +85°C - designed for reliable power-on reset and brownout protection in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK30D2+T datasheet, MAX6855UK30D2+T pinout, MAX6855UK30D2+T application, or MAX6855UK30D2+T equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), MR glitch rejection (200ns), and compatibility with low-voltage µP systems requiring stable, low-quiescent-current supervision.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and timing-controlled reset deassertion into a single BiCMOS IC. Its internal reset timeout generator ensures reset remains asserted for ≥40ms after VCC rises above 3.000V and MR is released - critical for ensuring full µP initialization before code execution resumes.
The MR input features an internal 10kΩ pullup to VCC, accepts CMOS-compatible logic levels (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC), and responds with 250ns MR-to-reset delay. Reset output is push-pull active-low, sinking up to 1.2mA at VCC ≥ 2.38V while maintaining VOL ≤ 0.3V - enabling direct interface with standard µP reset inputs without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.000V ±2.5% - factory-trimmed for precise brownout detection at nominal 3.0V rail |
| Reset Timeout Period | 40ms (min) - ensures µP completes power-up sequence before release |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Operating Voltage Range | 1.2V to 5.5V - supports supervision of 1.8V, 2.5V, 3.0V, 3.3V, and 5.0V rails |
| Reset Validity Limit | VCC ≥ 1.1V - guarantees functional reset assertion even during deep brownout |
| MR Input Glitch Rejection | 200ns - suppresses noise-induced false resets in noisy environments |
| VCC to Reset Delay | 40µs - fast response to supply droop, minimizing risk of erratic µP behavior |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives µP reset pin directly; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for stable operation |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; momentary switch to GND initiates reset |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity and thermal dissipation |
| 5 | VCC | Supply voltage input - monitors target rail; bypass with 0.1µF ceramic capacitor to GND for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in glucose monitors and wearables beyond 5 years |
| Guaranteed reset validity | Functional down to VCC = +1.1V - ensures deterministic reset behavior during severe brownout |
| No external components required | Integrated MR pullup, precision voltage reference, and timeout oscillator - eliminates BOM cost and layout area |
| Transient immunity | Immune to VCC glitches <40µs at 100mV overdrive - prevents spurious resets in electrically noisy handheld devices |
| Push-pull active-low RESET | Drives µP reset pin directly with VOL ≤ 0.3V at 1.2mA sink - eliminates need for external level-shifting or pullup resistors |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous glucose sensing in disposable wearable patches powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Supervises 3.0V analog front-end and BLE SoC power rails; asserts reset on battery voltage sag below 2.925V. Use Value: 170nA quiescent current enables >7-year shelf life; 40ms timeout ensures ADC calibration completes before firmware boot. |
Use Scenario: Portable ECG/SpO₂ units operating from dual AA alkaline cells with variable discharge profile. IC Role / Device Role / Timing Role: Monitors main 3.0V system rail and triggers hardware reset if voltage drops below 3.000V during RF transmission bursts. Use Value: Immunity to 30µs VCC transients prevents false resets during wireless data upload; guaranteed reset down to 1.1V covers full battery depletion range. |
| MP3 Players | Cell Phones (Feature Phones) |
Use Scenario: Flash-based audio players with Li-ion battery and 3.3V system rail. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for ARM7-based audio controller and NAND flash interface. Use Value: 40ms reset hold time exceeds NAND controller's tRST requirement; push-pull output eliminates need for discrete reset buffer. |
Use Scenario: Low-cost GSM handsets using 3.0V PMIC output to power baseband processor and display driver. IC Role / Device Role / Timing Role: Supervises 3.0V rail and coordinates reset timing between BBIC and LCD controller during cold start. Use Value: MR input allows mechanical reset button integration without debounce circuitry; 250ns MR-to-reset delay ensures immediate response to user-initiated reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | 3.3V fixed threshold; 200ms min timeout; 2.5µA ICC (typ); SOT23-5 | Higher supply current limits battery life in ultra-low-power designs; longer timeout may delay recovery after brief brownout | Select when 3.3V rail supervision is required and higher ICC is acceptable; not suitable for sub-3.0V systems |
| MAX6326UR30+T | 3.0V threshold; 1.6µA ICC (typ); open-drain RESET; no MR input; SOT23-5 | Lacks manual reset capability and consumes ~10× more current; requires external pullup resistor | Use only where MR is unnecessary and board space allows for pullup; avoid in portable medical devices requiring user reset |
Compared with TPS3836K33DBVR and MAX6326UR30+T, the MAX6855UK30D2+T delivers 14× lower supply current than the TPS3836 and adds MR functionality absent in the MAX6326 - making it uniquely suited for long-life, user-serviceable battery-powered medical instruments.
Availability
MAX6855UK30D2+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and MP3 players requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6855UK30D2+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 consumer applications.
The MAX6854–MAX6869 family was designed specifically for nanopower microprocessor supervision in battery-critical portable medical and handheld electronics - emphasizing ultra-low ICC, wide VCC range, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6855UK30D2+T?
The MAX6855UK30D2+T has a factory-trimmed reset threshold voltage of 3.000V with ±2.5% tolerance over temperature (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "30" corresponds to 3.000V nominal. The MAX6855UK30D2+T maintains this accuracy without external calibration or trimming components.
Does the MAX6855UK30D2+T include a watchdog timer function?
No, the MAX6855UK30D2+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input and watchdog timeout functionality. The MAX6855UK30D2+T belongs to the MAX6854/MAX6855/MAX6856 group, which provides voltage monitoring and manual reset only - confirmed by absence of WDI pin and watchdog-related electrical characteristics in its specification tables.
What is the reset timeout period for the MAX6855UK30D2+T, and how is it set?
The MAX6855UK30D2+T has a fixed 40ms minimum reset timeout period, indicated by suffix "D2" per Table 4 (Reset Timeout Periods). This timeout is factory-programmed and non-adjustable - unlike MAX6861–MAX6863 variants with pin-selectable CT input. The 40ms duration ensures sufficient hold time for µP initialization across all operating conditions, with typical value 60ms and maximum 80ms.
Can the MAX6855UK30D2+T operate from a 1.8V supply rail?
Yes, the MAX6855UK30D2+T operates from 1.2V to 5.5V, including 1.8V systems. Its supply current remains ultra-low (170nA typ at VCC = 1.8V), and reset output is guaranteed valid down to VCC = +1.1V. Electrical characteristics confirm VOL ≤ 0.3V at ISINK = 50µA and VOH ≥ 0.8×VCC at ISOURCE = 200µA - ensuring reliable interface with 1.8V logic families.
Is the MAX6855UK30D2+T pin-compatible with other supervisory ICs?
The MAX6855UK30D2+T uses a standard 5-pin SOT23-5 package with Pin 1 = RESET, Pin 2 = GND, Pin 3 = MR, Pin 4 = GND, Pin 5 = VCC. It is pin-compatible with the TPS3836/TPS3837/TPS3838 series per the datasheet's Features section, enabling drop-in replacement in existing layouts - provided the reset threshold (3.0V vs. 3.3V/2.93V) and timeout (40ms vs. 200ms) match system requirements.
MAX6855UK30D2+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:
- 3V
- 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
MAX6855UK30D2+T FAQ
1.How can I place an order for MAX6855UK30D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK30D2+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 MAX6855UK30D2+T reliable?
The price and inventory of MAX6855UK30D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK30D2+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK30D2+T?
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4.How is shipping managed for MAX6855UK30D2+T?
MAX6855UK30D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK30D2+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 MAX6855UK30D2+T?
For technical support, including MAX6855UK30D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK30D2+T requirements.
6.How does Aetrix verify that MAX6855UK30D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK30D2+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 MAX6855UK30D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK30D2+T?
All MAX6855UK30D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK30D2+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 MAX6855UK30D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK30D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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