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Analog Devices Inc./Maxim Integrated MAX6855UK43D6+T
- Part No.:
- MAX6855UK43D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK43D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,409
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Product details
Overview
The MAX6855UK43D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and fixed 1200ms minimum reset timeout. It asserts an active-high push-pull RESET output when VCC drops below its factory-trimmed 4.300V threshold (±2.5%), during MR assertion, or at power-up/brownout - ensuring reliable µP initialization in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK43D6+T datasheet, MAX6855UK43D6+T pinout, MAX6855UK43D6+T application, or MAX6855UK43D6+T equivalent, this device delivers ultra-low 170nA typical supply current, guaranteed RESET validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), and no external components required - critical for space- and power-constrained designs.
Technical Context
The MAX6855UK43D6+T implements a precision bandgap-based voltage monitor with 2.5% threshold tolerance and 0.5% hysteresis, coupled to a digital timeout counter that holds RESET asserted for ≥600ms after VCC rises above VTH and MR deasserts. Its active-high push-pull RESET output is referenced to VCC and sinks up to 1.2mA at VCC ≥ 2.38V while sourcing ≥0.8×VCC at 500µA load.
It features an internally pulled-up MR input (10kΩ to VCC) with 1µs minimum pulse width support and 200ns glitch rejection, enabling robust manual reset initiation without external debounce. Unlike watchdog variants, the MAX6855UK43D6+T omits WDI and CT pins, simplifying integration where only voltage supervision and manual reset are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.300V ±2.5% - ensures reliable reset assertion before µP brownout at 4.3V nominal supply |
| Reset Timeout | 600–1200ms min - guarantees sufficient hold time for full µP initialization and peripheral stabilization |
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries in always-on devices |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and supports direct interface to CMOS µP 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 - allows momentary switch-to-GND implementation without external components |
| Package | 5-pin SOT23 - footprint-compatible with industry-standard supervisory ICs for drop-in layout reuse |
Pinout & Package
MAX6855UK43D6+T uses a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm height) with gull-wing leads, RoHS-compliant lead-free finish (+T suffix), and operating temperature range of –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during reset; requires no external pullup; interfaces directly to µP reset pin |
| 2 | GND | Ground reference - must be connected to system ground plane for accurate voltage monitoring and noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; low pulse ≥1µs initiates reset; immune to <200ns glitches |
| 4 | GND | Second ground terminal - improves thermal dissipation and reduces ground impedance in noisy environments |
| 5 | VCC | Supply voltage input - monitored rail; bypass with 0.1µF capacitor to GND near pin for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in glucose monitors and wearable sensors beyond 5 years |
| Guaranteed RESET validity | Valid down to VCC = +1.1V - ensures deterministic reset behavior during deep brownout conditions |
| No external components | Self-contained supervision - eliminates BOM cost and board area for RC timing networks or pullup resistors |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in electrically noisy portable systems |
| Push-pull active-high RESET | Direct µP interface - avoids level-shifting complexity and leakage issues associated with open-drain configurations |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous glucose sensing in handheld or wearable units powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Supervises 3.3V analog front-end and BLE SoC supply; asserts RESET on battery sag or cold-start. Use Value: 170nA ICC enables >7-year shelf life; 4.300V threshold matches LiMnO₂ battery end-of-life voltage; 1200ms timeout accommodates slow ADC calibration sequences. |
Use Scenario: Portable ECG or SpO₂ units requiring FDA-grade reliability and low-power sleep modes. IC Role / Device Role / Timing Role: Monitors main 5V DC-DC output and triggers controlled µP reboot upon undervoltage or user-initiated diagnostics. Use Value: Dual-GND pins reduce ground bounce during reset assertion; 1.1V RESET validity ensures safe shutdown before memory corruption occurs. |
| Industrial Handheld Terminals | Smart Asset Trackers |
|
Use Scenario: Ruggedized barcode scanners operating across –20°C to +60°C ambient with intermittent 3.3V Li-ion supply. IC Role / Device Role / Timing Role: Provides brownout protection during motor-driven scan actuation causing supply droop. Use Value: 2.5% VTH tolerance and 0.5% hysteresis prevent chatter during marginal VCC recovery; MR pin enables field-service hard reset via test button. |
Use Scenario: GPS-enabled logistics tags powered by primary lithium batteries with 10-year design life. IC Role / Device Role / Timing Role: Supervises 3.6V supply to GNSS receiver and LoRa transceiver; initiates clean restart after deep-sleep wake-up. Use Value: SOT23 footprint minimizes PCB area; no external components reduce failure points in hermetically sealed enclosures. |
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 reset timeout; open-drain active-low RESET; 1.6µA ICC | Requires external pullup resistor; higher supply current limits battery lifetime in ultra-low-power designs | Select when 3.3V rail supervision suffices and board already uses open-drain reset architecture |
| MAX6316LUK43D3+T | Same 4.3V threshold and SOT23 package; 150ms timeout; active-low push-pull RESET; 1.2µA ICC | Shorter timeout may not meet µP initialization requirements; active-low logic necessitates signal inversion or µP compatibility check | Choose only if system reset polarity is active-low and faster timeout is acceptable |
Compared with TPS3836K33DBVR and MAX6316LUK43D3+T, the MAX6855UK43D6+T provides the longest reset timeout (600–1200ms), lowest quiescent current (170nA), and active-high push-pull output - making it uniquely suited for long-life, high-reliability medical and industrial battery-powered systems requiring extended initialization windows.
Availability
MAX6855UK43D6+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6855UK43D6+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 connectivity in demanding industrial, medical, and automotive applications.
The MAX6855UK43D6+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for ultra-low-power battery-operated equipment where reset reliability, minimal current draw, and compact packaging are non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX6855UK43D6+T?
The MAX6855UK43D6+T has a factory-trimmed reset threshold of 4.300V 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 "43" corresponds to VTH = 4.300V (min 4.193V, typ 4.300V, max 4.408V). The MAX6855UK43D6+T maintains this accuracy without calibration.
Does the MAX6855UK43D6+T include a watchdog timer function?
No, the MAX6855UK43D6+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI functionality. The MAX6855UK43D6+T is a dedicated voltage supervisor with manual reset (MR) and fixed reset timeout - confirmed by its pinout (no WDI pin) and absence of watchdog timing parameters in its electrical characteristics table.
What is the reset timeout period for the MAX6855UK43D6+T?
The MAX6855UK43D6+T has a minimum reset timeout period of 600ms, per the "D6" suffix in its part number (Table 4: Reset Timeout Periods). The datasheet specifies D6 = 600/900/1200ms (min/typ/max), meaning the device guarantees ≥600ms RESET assertion after VCC exceeds VTH and MR deasserts - sufficient for most ARM Cortex-M and RISC-V µP boot sequences.
Is the MAX6855UK43D6+T pin-compatible with other supervisory ICs?
Yes, the MAX6855UK43D6+T uses a standard 5-pin SOT23 package and shares pinout compatibility with the TPS3836/TPS3837/TPS3838 family (as noted in the Features section). Pin 1 = RESET (active-high push-pull), Pins 2 & 4 = GND, Pin 3 = MR, Pin 5 = VCC - enabling direct replacement in existing layouts where reset polarity and timeout align.
What is the maximum supply voltage the MAX6855UK43D6+T can monitor?
The MAX6855UK43D6+T monitors VCC over a range of 1.2V to 5.5V, with absolute maximum rating of +6.0V on the VCC pin. Its 4.300V reset threshold is optimized for 5V systems, but the device remains functional and asserts RESET correctly even when VCC is as low as 1.2V - validated across the full –40°C to +85°C temperature range per the Electrical Characteristics table.
MAX6855UK43D6+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:
- 4.3V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK43D6+T FAQ
1.How can I place an order for MAX6855UK43D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK43D6+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 MAX6855UK43D6+T reliable?
The price and inventory of MAX6855UK43D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK43D6+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK43D6+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK43D6+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK43D6+T?
MAX6855UK43D6+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK43D6+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 MAX6855UK43D6+T?
For technical support, including MAX6855UK43D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK43D6+T requirements.
6.How does Aetrix verify that MAX6855UK43D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK43D6+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 MAX6855UK43D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK43D6+T?
All MAX6855UK43D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK43D6+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 MAX6855UK43D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK43D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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