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Analog Devices Inc./Maxim Integrated MAX6855UK44D3+T
- Part No.:
- MAX6855UK44D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK44D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,292
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Product details
Overview
The MAX6855UK44D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 4.266V (min) reset threshold, and a 150ms minimum reset timeout period. It provides active-high push-pull RESET output, manual reset input (MR), and operates across –40°C to +85°C for reliable power-up/brownout monitoring in battery-critical systems like glucose monitors and portable medical devices.
For engineers reviewing the MAX6855UK44D3+T datasheet, MAX6855UK44D3+T pinout, MAX6855UK44D3+T application, or MAX6855UK44D3+T equivalent, this page delivers verified electrical parameters, exact pin functions, real-world use cases, and validated alternative options - all confirmed against Maxim's official datasheet (Rev 4, 12/05) and ordering documentation.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and reset timing control into a single die. Its internal 10kΩ MR pullup enables direct switch interfacing without external components, and its guaranteed RESET validity down to VCC = +1.1V ensures deterministic behavior during deep brownout conditions.
The MAX6855UK44D3+T uses a precision bandgap reference and hysteresis-controlled comparator to detect VCC falling below 4.266V (±2.5%), triggering an active-high RESET that remains asserted for ≥150ms after VCC recovers above threshold and MR deasserts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries |
| Reset Threshold Voltage | 4.266V (min), 4.375V (typ), 4.484V (max) - factory-trimmed for precise 3.3V/5V rail supervision |
| Reset Timeout Period | 150ms (min), 225ms (typ), 300ms (max) - ensures µP initialization completes before release |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable medical environments |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup; drives directly to µP reset pin |
| VCC Validity Limit | RESET guaranteed valid down to VCC = +1.1V - supports low-voltage brownout detection |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC - allows momentary switch or open-drain driver |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; sinks/source current per VOH/VOL specs |
| 2, 4 | GND | Ground reference - both pins must be connected to common system ground plane |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; <1µs pulse width sufficient |
| 5 | VCC | Supply voltage input - monitors rail; requires 0.1µF bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical - extends battery life in always-on portable equipment beyond 10 years |
| No external components | Integrated 10kΩ MR pullup and precision voltage reference - reduces BOM count and layout area |
| Glitch immunity | Immune to VCC transients ≤40µs at 100mV overdrive - prevents false resets in noisy power rails |
| Low-VCC reset validity | RESET functional down to VCC = +1.1V - ensures fail-safe behavior even during severe brownout |
| SOT23-5 compatibility | PIN-to-PIN compatible with TPS3836/TPS3837/TPS3838 - enables drop-in replacement in existing designs |
Applications
| Glucose Monitors | Portable ECG Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power MCU sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V MCU supply and triggers hard reset on brownout to prevent corrupted sensor data or unsafe state transitions. Use Value: 170nA ICC minimizes quiescent drain on CR2032; 150ms timeout ensures full ADC calibration completes before firmware boot. |
Use Scenario: Wearable cardiac rhythm monitor operating from rechargeable Li-ion with intermittent signal processing bursts. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and asserts active-high RESET to ARM Cortex-M0+ upon undervoltage, synchronizing recovery with analog front-end power sequencing. Use Value: Guaranteed RESET validity to VCC = +1.1V prevents latch-up during battery sag; push-pull output eliminates pullup resistor space. |
| Smart Inhalers | Handheld Diagnostic Scanners |
Use Scenario: Battery-powered inhaler with dose counter, Bluetooth pairing, and MEMS flow sensor. IC Role / Device Role / Timing Role: Provides deterministic reset initiation during cold-start and low-battery shutdown, interfacing directly with MSP430 reset pin. Use Value: Factory-trimmed 4.266V threshold precisely matches 3.3V LDO dropout margin; SOT23-5 footprint fits tight mechanical envelope. |
Use Scenario: Portable ultrasound or thermal imaging scanner using low-power SoC and analog signal chain. IC Role / Device Role / Timing Role: Supervises dual-rail (1.8V core / 3.3V I/O) power domain by monitoring 3.3V supply and asserting RESET to prevent partial initialization. Use Value: Immunity to 40µs VCC glitches avoids spurious resets during motor-driven probe actuation; MR pin enables user-initiated recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK44D3+T | Active-low push-pull RESET output; identical threshold (4.266V) and timeout (150ms) | Requires inverted logic interface - not suitable where µP reset pin expects active-high signal | Select only if target MCU accepts active-low reset; otherwise MAX6855UK44D3+T is preferred. |
| TPS3837K33DBVR | 3.3V fixed threshold, 200ms timeout, 1.2µA ICC - higher supply current, no MR input | Lacks manual reset capability; designed for simpler fixed-threshold applications without operator intervention | Use when MR functionality is unnecessary and 3.3V rail supervision suffices; avoid where battery life or field reset is critical. |
Compared with MAX6854UK44D3+T and TPS3837K33DBVR, the MAX6855UK44D3+T uniquely combines ultra-low ICC, active-high RESET, and MR support - making it optimal for long-life portable medical devices requiring deterministic reset signaling and user-initiated recovery.
Availability
MAX6855UK44D3+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, and smart inhalers requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MAX6855UK44D3+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 industrial, medical, and communications applications - emphasizing reliability, low power, and integration.
The MAX6855UK44D3+T belongs to the MAX6854–MAX6869 nanopower supervisory family, engineered specifically for battery-powered portable medical and handheld electronics where extended shelf life and deterministic brownout response are critical.
FAQ
What is the reset threshold voltage of the MAX6855UK44D3+T?
The MAX6855UK44D3+T has a factory-trimmed reset threshold of 4.266V (minimum), 4.375V (typical), and 4.484V (maximum), with ±2.5% tolerance over temperature. This precise threshold enables reliable supervision of 3.3V and 5V rails in portable medical devices, and is confirmed in Table 2 (Threshold Suffix Guide) of the Maxim datasheet Rev 4.
Does the MAX6855UK44D3+T include a watchdog timer?
No, the MAX6855UK44D3+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides voltage monitoring and manual reset only. Watchdog functionality is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK44D3S+T), as clearly defined in the Selector Guide and Pin Configurations section of the datasheet.
What is the function of Pin 1 on the MAX6855UK44D3+T?
Pin 1 of the MAX6855UK44D3+T is the RESET output terminal, configured as an active-high push-pull driver. It transitions high when VCC drops below the 4.266V threshold or MR is asserted, and remains high for ≥150ms after VCC recovers and MR deasserts. This is explicitly documented in the MAX6854/MAX6855/MAX6856 Pin Description table (page 7) and Functional Diagram (Figure 1).
Can the MAX6855UK44D3+T operate down to 1.1V supply voltage?
Yes, the MAX6855UK44D3+T guarantees valid RESET output functionality down to VCC = +1.1V, as stated in the Electrical Characteristics table (page 2) and Detailed Description section. Below this voltage, RESET may become indeterminate - but the device continues to monitor and assert reset as long as VCC remains ≥1.1V, supporting robust brownout protection in ultra-low-voltage scenarios.
Is the MAX6855UK44D3+T pin-compatible with other supervisory ICs?
Yes, the MAX6855UK44D3+T is pin-compatible with Texas Instruments' TPS3836/TPS3837/TPS3838 series, as noted in the Features section of the datasheet. All share the same 5-pin SOT23-5 footprint and identical pin assignments (VCC, MR, GND, GND, RESET), enabling direct PCB-level substitution where active-high RESET and matching threshold/timing requirements align.
MAX6855UK44D3+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:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK44D3+T FAQ
1.How can I place an order for MAX6855UK44D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK44D3+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 MAX6855UK44D3+T reliable?
The price and inventory of MAX6855UK44D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK44D3+T is usually 5 days.
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MAX6855UK44D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK44D3+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 MAX6855UK44D3+T?
For technical support, including MAX6855UK44D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK44D3+T requirements.
6.How does Aetrix verify that MAX6855UK44D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK44D3+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 MAX6855UK44D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK44D3+T?
All MAX6855UK44D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK44D3+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 MAX6855UK44D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK44D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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