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Analog Devices Inc./Maxim Integrated MAX6855UK46D6+T
- Part No.:
- MAX6855UK46D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK46D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,622
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Product details
Overview
The MAX6855UK46D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.625V reset threshold (±2.5%), and 600ms–1200ms minimum reset timeout period (D6 option). It provides active-low push-pull reset output, manual reset input (MR), and operates across –40°C to +85°C for battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK46D6+T datasheet, MAX6855UK46D6+T pinout, MAX6855UK46D6+T application, or MAX6855UK46D6+T equivalent, this page delivers verified specifications, validated pin functions, confirmed reset timing behavior, and real-world use cases in glucose monitors and low-power embedded systems.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and reset timeout generation - but no watchdog timer (MAX6855 excludes WDI functionality per Selector Guide). Its internal 10kΩ MR pullup ensures robust noise immunity without external components, and reset remains valid down to VCC = +1.1V.
The push-pull active-low RESET output drives directly into µP reset inputs with VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V), while supply current stays stable across temperature (170nA typ at +25°C, ≤220nA at +85°C) and supply voltage (1.2V–5.5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.625V (factory-trimmed, ±2.5% tolerance); ensures reliable brownout detection for 4.5–5.0V logic rails. |
| Reset Timeout | 600–1200ms (D6 option, min); guarantees sufficient hold time for full µP initialization after power recovery. |
| Supply Current | 170nA typical at +25°C; enables multi-year battery life in always-on patient monitors and wearables. |
| Operating Voltage | 1.2V to 5.5V; supports single-cell Li-ion, dual-cell alkaline, and regulated 3.3V/5V systems. |
| Reset Validity | Guaranteed to VCC = +1.1V; maintains deterministic reset state during deep brownout conditions. |
| Output Type | Push-pull active-low RESET; eliminates need for external pullup and simplifies interface to standard µP reset pins. |
| MR Input | Active-low with 10kΩ internal pullup; accepts CMOS-level signals and momentary switch inputs without debounce circuitry. |
Pinout & Package
Package: 5-pin SOT23-5 (lead-free, +T suffix), footprint-compatible with industry-standard 5-pin SOT23 layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low on VCC drop below 4.625V, MR low, or timeout expiration - holds low for full D6 period after recovery. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; pulse width ≥1µs required to trigger reset. |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity in high-frequency environments. |
| 5 | VCC | Supply voltage input and 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 enables >10-year operation on CR2032 coin cell in standby mode. |
| No external components | Integrated MR pullup, precision voltage reference, and timeout generator eliminate discrete BOM items. |
| VCC transient immunity | Immune to ≤40µs transients at 100mV overdrive; prevents false resets in noisy automotive or industrial environments. |
| Valid reset at low VCC | RESET output guaranteed functional down to VCC = +1.1V - critical for graceful shutdown in battery-depleted states. |
| SOT23-5 footprint | Industry-standard 5-pin SOT23 package enables drop-in replacement and automated assembly compatibility. |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Portable handheld glucose meter powered by single AAA battery with intermittent usage over 2+ years. IC Role / Device Role / Timing Role: Supervises VCC rail during power-up, detects brownout during battery depletion, and asserts reset to prevent corrupted measurement storage. Use Value: 170nA ICC extends battery life; 4.625V threshold aligns with nominal 4.5V alkaline cutoff; D6 timeout ensures EEPROM write completion before µP restart. |
Use Scenario: Wearable ECG patch logging heart rate and SpO₂ continuously for 72 hours on rechargeable Li-ion. IC Role / Device Role / Timing Role: Monitors regulated 3.3V supply, triggers reset on undervoltage or user-initiated reboot via tactile button (MR). Use Value: Push-pull RESET eliminates external pullup resistor; 1.1V validity preserves reset integrity during deep discharge; MR glitch rejection (200ns) prevents spurious resets. |
| Industrial Handheld Scanners | Smart Smoke Detectors |
|
Use Scenario: Rugged barcode scanner operating in warehouses with wide ambient temperature swings (–20°C to +60°C). IC Role / Device Role / Timing Role: Ensures clean µP boot after cold-start or battery swap; MR input enables field-service hard reset without opening enclosure. Use Value: –40°C to +85°C rating covers extended industrial range; 10kΩ MR pullup tolerates long PCB traces; GND pin redundancy reduces ground bounce. |
Use Scenario: Battery-backed smoke alarm with 10-year sealed lithium battery and self-test cycle every 60 seconds. IC Role / Device Role / Timing Role: Supervises backup power rail during AC failure; initiates controlled µP reset if voltage sags below safe operating level. Use Value: Nanopower draw minimizes battery drain during decade-long standby; 4.625V threshold matches 4.5V battery EOL voltage; D6 timeout accommodates firmware self-test duration. |
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 reset threshold; 200ms timeout; 1.8µA ICC (vs. 170nA) | Higher supply current limits use in >5-year battery devices; lacks 4.625V threshold option. | Select only when 3.3V rail supervision suffices and ultra-low ICC is not required. |
| MAX6361KA29D3+T | 2.93V threshold; 150ms timeout; 1.2µA ICC; same SOT23-5 package | Lower threshold and shorter timeout unsuitable for 4.5V+ systems requiring extended initialization time. | Prefer for lower-voltage rails (e.g., 3.0V µPs); avoid where 4.625V detection and 600ms+ hold time are mandatory. |
Compared with TPS3837K33DBVR and MAX6361KA29D3+T, the MAX6855UK46D6+T uniquely combines 4.625V precision threshold, sub-µA quiescent current, and configurable long-duration reset hold - making it the only viable choice for 4.5V+ battery-powered medical devices demanding multi-year operation.
Availability
MAX6855UK46D6+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, industrial handheld scanners, and smart smoke detectors requiring stable component supply across extended product lifecycles.
Supply support for MAX6855UK46D6+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.
The MAX6855UK46D6+T belongs to the nanopower µP supervisory family, engineered specifically for ultra-low-power battery-operated equipment where reset reliability and multi-year runtime are non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX6855UK46D6+T?
The MAX6855UK46D6+T has a factory-trimmed reset threshold of +4.625V, 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 "46" corresponds to 4.625V nominal. The MAX6855UK46D6+T maintains this accuracy without calibration or external components.
Does the MAX6855UK46D6+T include a watchdog timer function?
No, the MAX6855UK46D6+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input; MAX6855 is explicitly listed without WDI. The MAX6855UK46D6+T provides voltage monitoring, manual reset (MR), and fixed reset timeout - but no watchdog capability.
What does the "D6" in MAX6855UK46D6+T signify?
The "D6" suffix in MAX6855UK46D6+T specifies the reset timeout period option: 600ms minimum (900ms typical, 1200ms maximum). This is defined in Table 4 (Reset Timeout Periods) of the datasheet. The D6 option ensures sufficient reset assertion time for complex µP initialization sequences in medical and industrial firmware.
Is the MAX6855UK46D6+T pin-compatible with other SOT23-5 supervisory ICs?
Yes, the MAX6855UK46D6+T uses a standard 5-pin SOT23-5 package with Pin 1 = RESET, Pin 2 = GND, Pin 3 = MR, Pin 4 = GND, Pin 5 = VCC - matching common layout footprints. It is explicitly noted as pin-compatible with TPS3836/TPS3837/TPS3838 in the Features section, enabling direct PCB replacement where voltage and timing requirements align.
What is the minimum operating voltage for valid reset assertion in the MAX6855UK46D6+T?
The MAX6855UK46D6+T guarantees valid reset output down to VCC = +1.1V, as stated in the Features list and Electrical Characteristics table. This means the RESET signal remains electrically functional (with specified VOL/VOH) even as the supply collapses - a critical capability for fail-safe shutdown in battery-powered systems.
MAX6855UK46D6+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:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK46D6+T FAQ
1.How can I place an order for MAX6855UK46D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK46D6+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 MAX6855UK46D6+T reliable?
The price and inventory of MAX6855UK46D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK46D6+T is usually 5 days.
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Once your MAX6855UK46D6+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 MAX6855UK46D6+T?
For technical support, including MAX6855UK46D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK46D6+T requirements.
6.How does Aetrix verify that MAX6855UK46D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK46D6+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 MAX6855UK46D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK46D6+T?
All MAX6855UK46D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK46D6+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 MAX6855UK46D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK46D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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