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Analog Devices Inc./Maxim Integrated MAX6855UK46D1+T
- Part No.:
- MAX6855UK46D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK46D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,911
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Product details
Overview
The MAX6855UK46D1+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, 4.625V factory-trimmed reset threshold (±2.5%), 10ms minimum reset timeout, manual reset input (MR), and guaranteed reset validity down to VCC = +1.1V. It monitors supply voltage integrity during power-up, brownout, and shutdown in ultra-low-power portable systems.
For engineers reviewing the MAX6855UK46D1+T datasheet, MAX6855UK46D1+T pinout, MAX6855UK46D1+T application, or MAX6855UK46D1+T equivalent, this device serves as a precision, low-current (170nA typ) reset supervisor for battery-critical applications where deterministic reset timing and immunity to short VCC transients are essential.
Technical Context
The MAX6855UK46D1+T implements a voltage-monitoring comparator with hysteresis (0.5% of VTH), a monostable reset timeout generator (10ms min), and an internally pulled-up manual reset input (10kΩ). Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 50µA load when asserted.
No watchdog timer or CT pin functionality is present - this variant belongs to the MAX6855 subfamily, which excludes WDI and CT inputs and provides only MR and fixed-reset-timeout supervision with active-high reset polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.625V (factory-trimmed, ±2.5%) - ensures reliable reset assertion before 5V system brownout |
| Supply Current | 170nA typical at +25°C - enables multi-year battery life in always-on monitoring circuits |
| Reset Timeout | 10ms minimum - meets fast-recovery requirements for microcontrollers with short boot sequences |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup and interfaces directly to CMOS reset inputs |
| VCC Operating Range | 1.2V to 5.5V - supports supervision of 1.8V, 3.3V, and 5V rails with valid reset down to 1.1V |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies manual reset implementation using momentary switch to GND |
| Reset Delay (tRD) | 40µs max - ensures clean reset assertion during rapid VCC fall below threshold |
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 during reset; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for accurate voltage monitoring |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; assert by pulling to GND |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in noisy PCB layouts |
| 5 | VCC | Supply voltage input - monitored rail; bypass with 0.1µF capacitor to GND for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical - extends shelf life and runtime in coin-cell–powered medical and IoT devices |
| Reset Validity at Low VCC | Guaranteed operation down to VCC = +1.1V - ensures reset remains functional during deep brownout |
| Transient Immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| No External Components | Self-contained supervision - eliminates BOM cost and layout area for RC timing networks or pullups |
| Factory-Trimmed Threshold | ±2.5% accuracy over -40°C to +85°C - removes need for calibration or trimming in production |
Applications
| Portable Glucose Monitors | Low-Power Wearable Sensors |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 7–14 days on single CR2032 cell. IC Role / Device Role / Timing Role: Supervises 3.3V analog front-end and BLE SoC supply; asserts active-high RESET on brownout to force safe shutdown and preserve sensor calibration state. Use Value: 170nA quiescent current minimizes battery drain; 10ms reset timeout aligns with BLE controller's minimum wake-up latency. |
Use Scenario: ECG/PPG wristband operating from rechargeable Li-ion with >1-week runtime target. IC Role / Device Role / Timing Role: Monitors 1.8V digital core rail; triggers reset if VCC drops below 4.625V threshold during RF transmission surge. Use Value: Active-high push-pull output directly drives SoC reset pin without level-shifting; dual-GND pins reduce ground bounce-induced false resets. |
| Industrial Handheld Scanners | Remote Environmental Data Loggers |
|
Use Scenario: Rugged barcode scanner powered by 2xAA alkaline batteries with cold-temperature operation requirement (-20°C). IC Role / Device Role / Timing Role: Provides fail-safe reset during battery sag under motor-driven scan actuation; MR pin enables hardware-initiated recalibration. Use Value: Guaranteed reset function down to VCC = +1.1V ensures reliability even at end-of-battery-life; ±2.5% threshold tolerance maintains accuracy across temperature. |
Use Scenario: Solar-powered soil moisture/logger deployed in remote field locations with 5+ year maintenance interval. IC Role / Device Role / Timing Role: Supervises 5V solar charge management IC output; asserts RESET if input voltage collapses due to cloud cover or panel soiling. Use Value: Immunity to ≤40µs transients prevents false resets from switching regulator noise; SOT23-5 package enables compact, conformal-coated PCB design. |
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 timeout, open-drain output, 2.5µA ICC | Requires external pullup; higher current draw limits use in multi-year battery applications | Select when 3.3V rail supervision is needed and board space allows for pullup resistor |
| MAX6361KA29D3+T | 2.93V threshold, 10ms timeout, active-low open-drain, 1.6µA ICC | Active-low logic incompatible with SoCs requiring active-high reset; higher ICC reduces battery life | Choose only if legacy design mandates pin-compatible replacement with identical timeout and threshold family |
Compared with TPS3836K33DBVR and MAX6361KA29D3+T, the MAX6855UK46D1+T delivers 14× lower supply current and native active-high push-pull drive - eliminating external components and extending battery life in 4.5–5V portable systems where precise 4.625V brownout detection is critical.
Availability
MAX6855UK46D1+T is available at Aetrix Electronics and suitable for portable medical devices, industrial handhelds, remote environmental sensors, and battery-powered wearables requiring stable component supply with long-term lifecycle support.
Supply support for MAX6855UK46D1+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX685x family was engineered specifically for nanopower microprocessor supervision in battery-constrained systems, emphasizing ultra-low ICC, guaranteed low-VCC reset validity, and factory-trimmed voltage thresholds without external calibration.
FAQ
What is the exact reset threshold voltage of the MAX6855UK46D1+T?
The MAX6855UK46D1+T has a factory-trimmed reset threshold of +4.625V, with guaranteed tolerance of ±2.5% 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 "46" corresponds to 4.625V nominal. The MAX6855UK46D1+T does not require external adjustment or calibration to achieve this accuracy.
Does the MAX6855UK46D1+T include a watchdog timer function?
No, the MAX6855UK46D1+T does not include a watchdog timer. It belongs to the MAX6855 subfamily, which provides only voltage monitoring, manual reset (MR) input, and fixed reset timeout - without WDI pin or watchdog circuitry. Watchdog capability is exclusive to MAX6864–MAX6869 variants, as confirmed in the Selector Guide and Pin Descriptions sections of the datasheet.
What is the function of Pin 4 on the MAX6855UK46D1+T?
Pin 4 on the MAX6855UK46D1+T is a second ground (GND) terminal, electrically connected internally to Pin 2. Its inclusion improves noise immunity and reduces ground path impedance in high-noise or high-current-switching environments. This dual-GND configuration is standard across the MAX6854/MAX6855/MAX6856 SOT23-5 variants and must be connected to the same system ground potential as Pin 2.
Can the MAX6855UK46D1+T operate with a 1.2V supply?
Yes, the MAX6855UK46D1+T operates with VCC as low as 1.2V per Absolute Maximum Ratings and Electrical Characteristics tables. Crucially, its reset output remains valid (guaranteed to drive correctly) down to VCC = +1.1V - enabling reliable supervision even during deep brownout conditions where other supervisors may fail to assert reset cleanly.
Is the MAX6855UK46D1+T pin-compatible with the TPS3836 series?
Yes, the MAX6855UK46D1+T is pin-compatible with select TPS3836/TPS3837/TPS3838 devices in the 5-pin SOT23 package, as explicitly stated in the Features section of the datasheet. However, electrical differences exist - including reset polarity (active-high vs. active-low), threshold voltage (4.625V vs. 3.08V/3.3V), and supply current (170nA vs. ~2µA) - requiring schematic review before drop-in substitution.
MAX6855UK46D1+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:
- 4.625V
- 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
MAX6855UK46D1+T FAQ
1.How can I place an order for MAX6855UK46D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK46D1+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 MAX6855UK46D1+T reliable?
The price and inventory of MAX6855UK46D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK46D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK46D1+T?
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4.How is shipping managed for MAX6855UK46D1+T?
MAX6855UK46D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK46D1+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 MAX6855UK46D1+T?
For technical support, including MAX6855UK46D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK46D1+T requirements.
6.How does Aetrix verify that MAX6855UK46D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK46D1+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 MAX6855UK46D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK46D1+T?
All MAX6855UK46D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK46D1+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 MAX6855UK46D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK46D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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