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Analog Devices Inc./Maxim Integrated MAX6855UK42D1+T
- Part No.:
- MAX6855UK42D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK42D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,401
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Product details
Overview
The MAX6855UK42D1+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, 4.200V factory-trimmed reset threshold (±2.5%), 10ms minimum reset timeout, and manual reset input. It monitors VCC for brownout detection, asserts reset during power-up/down, and guarantees valid reset operation down to VCC = +1.1V - ideal for low-voltage portable medical devices and battery-powered instrumentation.
For engineers reviewing the MAX6855UK42D1+T datasheet, MAX6855UK42D1+T pinout, MAX6855UK42D1+T application, or MAX6855UK42D1+T equivalent, key selection criteria include its ultra-low 170nA typical supply current, immunity to short VCC transients (<40µs at 100mV overdrive), guaranteed reset validity at 1.1V, and compatibility with CMOS-level MR input and push-pull RESET logic interface.
Technical Context
This device implements a precision bandgap-based voltage monitor with hysteresis (0.5% of VTH) and an internal RC timer for fixed reset timeout. Its reset assertion logic combines VCC monitoring, MR input sampling, and glitch rejection (200ns), with no external components required. The push-pull active-high RESET output is referenced to VCC and sinks up to 1.2mA at VCC ≥ 2.38V.
The MAX6855UK42D1+T belongs to the MAX6854–MAX6869 family but excludes watchdog timer and CT-selectable timeout features. It uses BiCMOS process technology (2848 transistors), operates across –40°C to +85°C, and supports lead-free SOT23-5 packaging with 0.1µF VCC bypassing recommended.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.200V ±2.5% - ensures reliable brownout detection for 4.5V nominal systems with margin |
| Supply Current | 170nA typ at +25°C - enables multi-year battery life in always-on medical sensors |
| Reset Timeout | 10ms min - meets µP power-up initialization timing requirements without external timing components |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V rail monitoring |
| Reset Validity | Guaranteed to VCC = +1.1V - maintains deterministic reset state during deep brownout |
| MR Input Logic | Active-low, internally pulled up to VCC via 10kΩ - accepts CMOS levels; no external pullup needed |
| RESET Output Type | Push-pull active-high - drives high directly to VCC; eliminates need for external pullup resistor |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant), 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high to VCC when asserted; compatible with µP reset inputs requiring active-high logic |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return for all internal circuits |
| 3 | MR | Active-low manual reset input - initiates reset when pulled low; internally pulled up to VCC (10kΩ); accepts open-drain or CMOS drivers |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity and thermal dissipation |
| 5 | VCC | Supply voltage input - monitored rail; requires 0.1µF ceramic bypass capacitor to GND for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - reduces quiescent power in battery-critical applications like glucose monitors |
| No external components | Integrated voltage reference, timer, and pullup - eliminates BOM cost and layout area for discrete supervision |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments |
| Guaranteed reset at low VCC | Valid RESET output down to VCC = +1.1V - ensures deterministic behavior during deep undervoltage conditions |
| CMOS-compatible MR | MR accepts standard CMOS logic levels and includes 10kΩ internal pullup - simplifies interface with microcontrollers and FPGAs |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous glucose sensing in handheld meters powered by coin-cell batteries. IC Role / Device Role / Timing Role: Supervises 3.0V analog front-end and 1.8V MCU supply rails; asserts active-high RESET during cold-start and low-battery brownout. Use Value: 170nA ICC extends battery life beyond 2 years; 4.200V threshold ensures reset before ADC reference collapse. |
Use Scenario: Wearable ECG/SpO₂ loggers operating on rechargeable Li-Po cells with tight voltage margins. IC Role / Device Role / Timing Role: Monitors main 3.3V system rail and triggers reset if voltage drops below 4.200V due to load surge or aging cell. Use Value: 10ms reset timeout satisfies ARM Cortex-M0+ boot ROM requirements; push-pull output avoids pullup resistor in space-constrained PCB. |
| Industrial Handheld Scanners | Low-Power Wireless Sensor Nodes |
|
Use Scenario: Rugged barcode scanners using alkaline AA batteries with wide discharge curve (1.0–1.6V/cell). IC Role / Device Role / Timing Role: Detects end-of-life condition on 4.5V regulated rail; asserts RESET before microcontroller executes corrupted code. Use Value: Guaranteed reset validity to VCC = +1.1V prevents latch-up during final battery depletion phase. |
Use Scenario: Sub-GHz IoT nodes sleeping >99% of time, waking only for sensor reads and LoRaWAN transmission. IC Role / Device Role / Timing Role: Provides fail-safe reset during wake-up sequence if LDO output sags under RF transmit load. Use Value: No external timing components reduce leakage paths; SOT23-5 footprint fits 2-layer PCB designs with minimal keepout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.3V fixed threshold; 200ms timeout; open-drain RESET; 1.6µA ICC | Higher supply current limits use in multi-year battery applications; open-drain requires external pullup | Select only if 3.3V threshold matches system rail and higher ICC is acceptable |
| MAX6326UR29+T | 2.93V threshold; 1.5ms timeout; push-pull active-low RESET; 800nA ICC | Shorter timeout may not satisfy modern µP boot requirements; active-low logic incompatible without level shift | Prefer only for legacy 2.93V systems needing faster reset deassertion |
Compared with TPS3837K33DBVR and MAX6326UR29+T, the MAX6855UK42D1+T delivers 10× lower supply current than the TPS3837 and a longer, more robust 10ms timeout than the MAX6326 - making it optimal for next-generation ultra-low-power medical and industrial edge devices requiring precise 4.2V brownout protection.
Availability
MAX6855UK42D1+T is available at Aetrix Electronics and suitable for portable glucose monitors, patient vital sign loggers, and industrial handheld scanners requiring stable component supply with long-term lifecycle support.
Supply support for MAX6855UK42D1+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 MAX6854–MAX6869 family delivers nanopower supervisory functionality for battery-critical systems, emphasizing ultra-low ICC, guaranteed low-VCC operation, and integrated reset timing - targeting portable healthcare, wearables, and energy-harvesting endpoints.
FAQ
What is the exact reset threshold voltage of the MAX6855UK42D1+T?
The MAX6855UK42D1+T has a factory-trimmed reset threshold of 4.200V 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 "42" corresponds to 4.200V nominal. The device guarantees reset assertion when VCC falls below this threshold and release after VCC exceeds it plus hysteresis (0.5% of VTH).
Does the MAX6855UK42D1+T include a watchdog timer function?
No, the MAX6855UK42D1+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 capability. The MAX6855UK42D1+T is a manual-reset-only supervisory circuit with VCC monitoring and push-pull active-high RESET output.
What is the function of Pin 4 on the MAX6855UK42D1+T?
Pin 4 on the MAX6855UK42D1+T is a second GND terminal, electrically connected to Pin 2 internally. Its inclusion improves noise immunity and thermal performance in the 5-pin SOT23 package. Both ground pins must be soldered to the same PCB ground plane to ensure proper operation and meet specified electrical characteristics.
Can the MAX6855UK42D1+T operate with VCC below 1.2V?
The MAX6855UK42D1+T is specified to operate down to VCC = +1.2V per Absolute Maximum Ratings and Electrical Characteristics tables. While reset output remains valid down to +1.1V, full functional operation (including MR input recognition and internal timing) is only guaranteed above +1.2V. Operation below 1.2V is outside datasheet specifications and not recommended.
Is the MAX6855UK42D1+T pin-compatible with other devices in the MAX6854–MAX6869 family?
Yes, the MAX6855UK42D1+T shares the identical 5-pin SOT23-5 pinout with MAX6854, MAX6856, MAX6861–MAX6863, and MAX6864–MAX6869 variants. However, pin functions differ: MAX6855 uses Pin 1 for active-high RESET (unlike MAX6854's active-low RESET), and lacks WDI or CT pins. Direct replacement requires verifying matching reset polarity and feature set.
MAX6855UK42D1+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:
- 4.2V
- 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
MAX6855UK42D1+T FAQ
1.How can I place an order for MAX6855UK42D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK42D1+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 MAX6855UK42D1+T reliable?
The price and inventory of MAX6855UK42D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK42D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK42D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK42D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK42D1+T?
MAX6855UK42D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK42D1+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 MAX6855UK42D1+T?
For technical support, including MAX6855UK42D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK42D1+T requirements.
6.How does Aetrix verify that MAX6855UK42D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK42D1+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 MAX6855UK42D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK42D1+T?
All MAX6855UK42D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK42D1+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 MAX6855UK42D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK42D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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