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Analog Devices Inc./Maxim Integrated MAX6855UK42D6+T
- Part No.:
- MAX6855UK42D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK42D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,344
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Product details
Overview
The MAX6855UK42D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and factory-trimmed 4.200V reset threshold with 1200ms minimum reset timeout period. It monitors VCC supply integrity, asserts reset during brownout or manual trigger, and guarantees valid reset operation down to VCC = +1.1V. Designed for ultra-low-power portable systems including glucose monitors and patient monitors.
For engineers reviewing the MAX6855UK42D6+T datasheet, MAX6855UK42D6+T pinout, MAX6855UK42D6+T application, or MAX6855UK42D6+T equivalent, key selection criteria include its 170nA typical supply current, 4.200V ±2.5% reset threshold, 1200ms reset timeout, MR input with 10kΩ internal pullup, and guaranteed reset validity at VCC ≥ 1.1V - all critical for battery-powered medical and handheld devices.
Technical Context
This device implements a precision voltage monitor with hysteresis (0.5% of VTH) and an internal reset timeout generator that holds RESET asserted for ≥600ms (typical 900ms, max 1200ms) after VCC rises above threshold or MR deasserts. The active-high push-pull RESET output is referenced to VCC and delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V).
It features immunity to short VCC transients (e.g., ≤40µs for 100mV overdrive), MR glitch rejection of 200ns, and MR-to-reset delay of 250ns. No external components are required, and it operates across –40°C to +85°C with supply voltage range 1.2V to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.200V ±2.5% - ensures reliable power-on reset for 4.2V nominal Li-ion or regulated 4.2V rails |
| Reset Timeout Period | 600–1200ms - guarantees µP initialization completes before release, compatible with slow-start regulators |
| Supply Current | 170nA typ at +25°C - enables multi-year battery life in always-on medical sensors |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell LiFePO₄ (≈3.2V), dual-cell alkaline (≈3.0V), and 5V systems |
| Reset Validity Voltage | Guaranteed to VCC = +1.1V - maintains deterministic reset state during deep brownout |
| MR Input Pullup | 10kΩ internal - eliminates need for external resistor; allows direct switch-to-GND interface |
| Output Type | Active-high push-pull - drives high without external pullup; compatible with µP reset inputs requiring logic-high assertion |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; no external pullup needed; sinks 1.2mA at VCC ≥ 2.38V |
| 2 | GND | Ground reference - must be connected to system ground plane for noise immunity and accurate threshold sensing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS levels; 250ns MR-to-reset delay |
| 4 | GND | Second ground terminal - improves thermal dissipation and reduces ground bounce in noisy environments |
| 5 | VCC | Supply and monitored voltage input - bypass with 0.1µF ceramic capacitor to GND; reset asserted if VCC falls below 4.200V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in portable medical devices beyond 5 years |
| Factory-trimmed reset threshold | 4.200V ±2.5% - eliminates calibration overhead and external resistor networks |
| Guaranteed reset validity | Down to VCC = +1.1V - ensures safe shutdown sequencing even during severe undervoltage |
| MR glitch rejection | 200ns - prevents spurious resets from ESD or board-level noise on manual reset line |
| No external components required | Self-contained supervision - reduces BOM count, PCB area, and qualification effort |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
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 rail powering sensor ADC and BLE SoC; asserts active-high RESET to hold MCU in reset until stable power is confirmed. Use Value: 170nA quiescent current avoids draining coin-cell batteries between readings; 4.200V threshold matches Li-ion charging termination voltage. | Use Scenario: Multi-parameter bedside monitor with ECG, SpO₂, and NIBP modules operating from rechargeable Li-ion pack. IC Role / Device Role / Timing Role: Monitors main 4.2V system rail; provides 1200ms reset hold time to ensure FPGA configuration and analog front-end stabilization. Use Value: Guaranteed reset validity to VCC = 1.1V prevents erratic behavior during battery swap or sudden load transients. |
| Portable ECG Devices | Handheld Diagnostic Scanners |
Use Scenario: Battery-powered 12-lead ECG recorder with flash storage and USB-C charging. IC Role / Device Role / Timing Role: Active-high push-pull RESET directly interfaces with ARM Cortex-M4 reset pin; MR input enables hardware-initiated self-test reset. Use Value: Internal 10kΩ MR pullup simplifies mechanical button design; 250ns MR-to-reset delay enables responsive user-triggered recovery. | Use Scenario: Ruggedized infrared thermography scanner using low-voltage imaging sensor and display driver. IC Role / Device Role / Timing Role: Supervises 2.8V analog sensor supply and 1.8V digital core rail via separate MAX6855 instances; immune to 40µs VCC glitches. Use Value: Transient immunity prevents false resets during motor actuation or RF burst transmission near power rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK42D6+T | Active-low open-drain RESET output; requires external pullup; same 4.200V threshold and 1200ms timeout | Suitable where µP reset pin is active-low and system uses shared reset bus with pullup | Select when interfacing with legacy µPs requiring active-low reset assertion and level-shifting flexibility |
| TPS3837K33DBVR | 3.3V fixed threshold; 200ms reset timeout; 1.5µA supply current; SOT23-5 | Designed for 3.3V systems only; higher current draw limits battery lifetime in ultra-low-power use cases | Choose only for cost-sensitive 3.3V designs where 170nA current and 4.2V threshold are not required |
Compared with MAX6854UK42D6+T, the MAX6855UK42D6+T eliminates external pullup needs and simplifies layout, while TPS3837K33DBVR trades nanopower efficiency and precise 4.2V threshold for lower unit cost in non-battery-critical 3.3V applications.
Availability
MAX6855UK42D6+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and portable ECG devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6855UK42D6+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.
The MAX685x family was designed specifically for nanopower microprocessor supervision in battery-constrained medical and portable electronics, emphasizing ultra-low ICC, guaranteed low-VCC reset validity, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK42D6+T?
The MAX6855UK42D6+T has a factory-trimmed reset threshold of 4.200V with ±2.5% tolerance over temperature (–40°C to +85°C). This value is specified in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "42" corresponds to 4.200V nominal. The device asserts RESET high when VCC falls below this threshold and holds it for ≥600ms after VCC recovers.
Does the MAX6855UK42D6+T include a watchdog timer function?
No, the MAX6855UK42D6+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides only voltage monitoring and manual reset (MR) functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK42D6S+T), identified by the "S" or "L" suffix in the ordering code.
What is the function of Pin 4 on the MAX6855UK42D6+T?
Pin 4 on the MAX6855UK42D6+T is a second GND terminal. Unlike variants with WDI or CT pins, the MAX6855 uses Pins 2 and 4 both as ground connections to improve thermal performance and reduce ground impedance in compact layouts. Both GND pins must be connected to the same system ground plane for proper operation and noise immunity.
Can the MAX6855UK42D6+T operate with supply voltages below 1.2V?
No, the MAX6855UK42D6+T specifies a minimum operating VCC of 1.2V per Absolute Maximum Ratings and Electrical Characteristics tables. While its reset output remains valid down to VCC = +1.1V (ensuring clean deassertion during brownout), the device does not guarantee functional operation - such as MR detection or timeout timing - below 1.2V. Operation below 1.2V may result in undefined behavior.
Is the MAX6855UK42D6+T pin-compatible with the TPS3837 series?
No, the MAX6855UK42D6+T is not pin-compatible with the TPS3837 series. Although both are 5-pin SOT23 supervisory circuits, their pinouts differ: MAX6855 assigns Pin 1 to RESET (active-high push-pull), Pin 2/GND, Pin 3/MR, Pin 4/GND, Pin 5/VCC; TPS3837 uses Pin 1/VDD, Pin 2/GND, Pin 3/RESET (active-low open-drain), Pin 4/SENSE, Pin 5/Manual Reset. Direct replacement requires PCB redesign.
MAX6855UK42D6+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:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK42D6+T FAQ
1.How can I place an order for MAX6855UK42D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK42D6+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 MAX6855UK42D6+T reliable?
The price and inventory of MAX6855UK42D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK42D6+T is usually 5 days.
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Once your MAX6855UK42D6+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 MAX6855UK42D6+T?
For technical support, including MAX6855UK42D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK42D6+T requirements.
6.How does Aetrix verify that MAX6855UK42D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK42D6+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 MAX6855UK42D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK42D6+T?
All MAX6855UK42D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK42D6+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 MAX6855UK42D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK42D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6855UK42D6+T Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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