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Analog Devices Inc./Maxim Integrated MAX6855UK44D1+T
- Part No.:
- MAX6855UK44D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK44D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,715
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Product details
Overview
MAX6855UK44D1+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull RESET output, 4.266V (min) factory-trimmed reset threshold, 10ms minimum reset timeout, manual reset input (MR), and operation down to VCC = +1.1V. It monitors supply voltage integrity and asserts reset during power-up, brownout, or manual trigger - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6855UK44D1+T datasheet, MAX6855UK44D1+T pinout, MAX6855UK44D1+T application, or MAX6855UK44D1+T equivalent, key selection criteria include guaranteed reset validity at low VCC, ultra-low 170nA typical supply current, precise 4.266V threshold tolerance (±2.5%), and compatibility with CMOS-level MR signaling in space-constrained portable systems.
Technical Context
The MAX6855UK44D1+T implements a precision bandgap-based voltage monitor with 2.5% threshold accuracy over -40°C to +85°C, paired with a fixed 10ms reset timeout timer and internal 10kΩ MR pullup. Its active-high push-pull RESET output drives directly to VCC without external components.
No watchdog timer or CT pin functionality is present - this variant belongs to the MAX6855 subgroup defined by active-high RESET, MR support, and absence of WDI/CT inputs. Reset assertion is triggered solely by VCC falling below 4.266V or MR low, with deassertion delayed 10ms after both conditions clear.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.266V (min), ±2.5% tolerance - ensures reliable detection of 4.3V nominal supply droop before µP malfunction |
| Supply Current | 170nA (typ) at +25°C - enables multi-year battery life in always-on patient monitors |
| Reset Timeout Period | 10ms (min) - provides sufficient hold time for µP initialization while minimizing system wake-up latency |
| Operating Voltage Range | 1.2V to 5.5V - supports Li-ion, coin-cell, and regulated 3.3V/5V rails |
| Reset Valid Down To | VCC = +1.1V - guarantees deterministic reset state even during deep brownout |
| MR Input Logic | Active-low, internally pulled up to VCC via 10kΩ - accepts direct CMOS or open-drain drive without external bias |
| Output Type | Push-pull active-high RESET - eliminates need for external pullup and simplifies interface to µP reset pin |
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-high push-pull reset output - drives high when VCC ≥ 4.266V and MR is high; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for accurate threshold sensing |
| 3 | MR | Active-low manual reset input - internal 10kΩ pullup to VCC; assert low ≥1µs to trigger reset |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in noisy PCB environments |
| 5 | VCC | Supply voltage input - monitored for reset condition; bypass with 0.1µF ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - reduces quiescent power in battery-backed systems by >95% vs. standard supervisors |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = +1.1V - prevents undefined µP behavior during deep discharge |
| No external components | Integrated MR pullup and push-pull output - eliminates BOM count and layout area for discrete biasing |
| Immunity to short VCC transients | Rejects ≤40µs transients at 100mV overdrive - avoids false resets in electrically noisy portable equipment |
| Precision threshold trimming | Factory-trimmed 4.266V threshold with ±2.5% max variation - removes need for external resistor divider calibration |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V rail powering sensor ADC and BLE SoC; asserts active-high RESET on brownout to force clean µP restart. Use Value: 170nA ICC extends CR2032 battery life beyond 2 years; 10ms timeout ensures full µP register initialization before firmware execution. |
Use Scenario: Portable ECG patch with motion-triggered recording and wireless data upload. IC Role / Device Role / Timing Role: Monitors 1.8V LDO output feeding analog front-end and ARM Cortex-M0+; triggers reset if supply sags during RF burst. Use Value: 4.266V threshold precisely matches 4.3V battery cutoff; push-pull output interfaces directly to µP's active-high reset pin without level-shifting. |
| MP3 Players | Smart Pagers |
Use Scenario: Flash-based audio player with USB charging and OLED display. IC Role / Device Role / Timing Role: Guards 3.3V system rail against voltage collapse during LCD backlight turn-on spikes. Use Value: Dual-GND pins (Pins 2 & 4) reduce ground bounce-induced false resets; 10ms timeout aligns with NAND flash controller boot sequence. |
Use Scenario: Two-way messaging device with vibration motor and low-power LoRaWAN transceiver. IC Role / Device Role / Timing Role: Provides fail-safe reset during cold-start from depleted LiPo cell (<3.0V). Use Value: Valid reset down to VCC = +1.1V ensures deterministic state recovery even at end-of-life battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.08V fixed threshold, 200ms timeout, open-drain output, 1.6µA ICC | Higher supply current and longer timeout - less suitable for sub-10ms µP boot timing or multi-year battery life | Select only if system requires open-drain flexibility or 3.3V rail monitoring with longer reset hold time |
| MAX6315US31D3+ | 3.08V threshold, 10ms timeout, push-pull active-low output, 1.2µA ICC | Active-low output requires µP reset pin compatibility; higher ICC increases quiescent load 7x vs. MAX6855UK44D1+T | Choose when legacy design uses active-low reset and 3.08V threshold suffices - not for ultra-low-power or 4.266V-specific use cases |
Compared with TPS3837K33DBVR and MAX6315US31D3+, the MAX6855UK44D1+T delivers 70× lower supply current and exact 4.266V threshold matching for 4.3V battery-cutoff systems, while its active-high push-pull output eliminates level-shifting overhead in modern µP designs.
Availability
MAX6855UK44D1+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, and MP3 players requiring stable component supply across extended production lifecycles and global regulatory compliance.
Supply support for MAX6855UK44D1+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 management, sensing, and interface applications in industrial, medical, and portable electronics.
The MAX6855UK44D1+T belongs to the nanopower µP supervisory family engineered specifically for battery-critical medical and handheld devices where sub-µA quiescent current and guaranteed low-VCC reset validity are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6855UK44D1+T?
The MAX6855UK44D1+T has a factory-trimmed minimum reset threshold voltage of 4.266V, with ±2.5% tolerance over temperature (-40°C to +85°C). This value corresponds to the "44" suffix in the part number per Maxim's Threshold Suffix Guide, and is verified in the Electrical Characteristics table under VTH parameter.
Does the MAX6855UK44D1+T include a watchdog timer?
No, the MAX6855UK44D1+T does not include a watchdog timer. It belongs to the MAX6855 subgroup, which provides only voltage monitoring and manual reset functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants, as confirmed in the Selector Guide and Pin Description sections.
What is the function of Pin 4 on the MAX6855UK44D1+T?
Pin 4 on the MAX6855UK44D1+T is a second ground terminal (GND), electrically connected internally to Pin 2. Its inclusion improves noise immunity and reduces ground loop effects in compact PCB layouts - a design feature shared across the MAX6854/MAX6855/MAX6856 series in SOT23-5 package.
Can the MAX6855UK44D1+T operate with a supply voltage below 1.2V?
No - the MAX6855UK44D1+T specifies an absolute minimum operating supply voltage of 1.2V per Absolute Maximum Ratings and Electrical Characteristics tables. While reset output remains valid down to VCC = +1.1V, functional operation (including internal comparator and timer) is only guaranteed from 1.2V to 5.5V.
Is the MAX6855UK44D1+T pin-compatible with other MAX68xx supervisory ICs?
The MAX6855UK44D1+T shares the same 5-pin SOT23-5 footprint with MAX6854, MAX6856, MAX6858, and MAX6860–MAX6869, but pin functions differ across variants. Specifically, MAX6855UK44D1+T uses Pin 1 for active-high RESET and Pins 2 & 4 for GND - unlike MAX6854 (active-low RESET on Pin 1) or MAX6864 (WDI on Pin 4). PCB layout must match the exact variant's pinout.
MAX6855UK44D1+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:
- 4.375V
- 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
MAX6855UK44D1+T FAQ
1.How can I place an order for MAX6855UK44D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK44D1+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 MAX6855UK44D1+T reliable?
The price and inventory of MAX6855UK44D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK44D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK44D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK44D1+T transactions.
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4.How is shipping managed for MAX6855UK44D1+T?
MAX6855UK44D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK44D1+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 MAX6855UK44D1+T?
For technical support, including MAX6855UK44D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK44D1+T requirements.
6.How does Aetrix verify that MAX6855UK44D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK44D1+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 MAX6855UK44D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK44D1+T?
All MAX6855UK44D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK44D1+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 MAX6855UK44D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK44D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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