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Analog Devices Inc./Maxim Integrated MAX6855UK46D3+T
- Part No.:
- MAX6855UK46D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK46D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,739
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Product details
Overview
MAX6855UK46D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, 4.625V factory-trimmed reset threshold (±2.5%), 150ms minimum reset timeout, and manual reset input. It monitors VCC supply integrity and asserts reset during power-up, brownout, or operator-initiated reset events in ultra-low-power systems.
For engineers reviewing the MAX6855UK46D3+T datasheet, MAX6855UK46D3+T pinout, MAX6855UK46D3+T application, or MAX6855UK46D3+T equivalent, this device serves as a precision voltage monitor with guaranteed reset validity down to VCC = +1.1V, 170nA typical supply current, and immunity to short VCC transients - critical for battery-powered medical and portable electronics design.
Technical Context
The MAX6855UK46D3+T implements a precision bandgap-based voltage detector with 2.5% threshold tolerance over -40°C to +85°C, coupled to a monolithic RC timeout timer. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load, enabling direct interface with µP reset inputs requiring high-true assertion.
Manual reset is implemented via an internally 10kΩ-pulled-up MR input with 1µs minimum pulse width and 200ns glitch rejection. The device lacks watchdog timer or CT select functionality - confirmed by Selector Guide and Pin Description tables - distinguishing it from MAX686x and MAX6861–63 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.625V (factory-trimmed, ±2.5% over temp), ensures reliable detection of 5V rail brownout before µP malfunction |
| Supply Current | 170nA typical at +25°C, enables >10-year battery life in coin-cell-powered glucose monitors |
| Reset Timeout | 150ms minimum (D3 option), guarantees µP reset hold time exceeds boot ROM initialization latency |
| Operating Voltage | 1.2V to 5.5V, supports operation down to single-cell Li-ion (3.0V) or dual-cell alkaline (3.2V) |
| Reset Validity | Guaranteed to VCC = +1.1V, maintains deterministic reset state during deep discharge |
| Output Type | Active-high push-pull RESET, eliminates need for external pullup and reduces BOM count |
Pinout & Package
Package: 5-pin SOT23-5 (2.9mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high when VCC ≥ 4.625V and MR deasserted; sinks ≤0.3V at 1.2mA |
| 2, 4 | GND | Ground reference for all internal circuits; must be connected to system ground plane with low-inductance path |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF ceramic bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables multi-year operation on CR2032 coin cells |
| VCC transient immunity | Rejects ≤40µs VCC glitches at 100mV overdrive, preventing spurious resets in noisy environments |
| No external components | Integrates voltage reference, comparator, timer, and push-pull driver - zero external parts required |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = +1.1V ensures fail-safe behavior during battery depletion |
| MR input robustness | 200ns glitch rejection and 1µs minimum pulse width tolerate mechanical switch bounce without debounce |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Portable handheld glucose meters powered by single CR2032 battery with intermittent usage over 2+ years. IC Role / Device Role / Timing Role: Supervises 3.0V supply rail and asserts active-high RESET to ARM Cortex-M0 µP during power-on and low-battery brownout. Use Value: 170nA quiescent current extends battery life beyond 36 months; 4.625V threshold prevents false resets during normal 3.0V operation while catching critical undervoltage. |
Use Scenario: Battery-backed bedside patient monitors requiring continuous sensor data logging and alarm integrity. IC Role / Device Role / Timing Role: Monitors main 5V DC/DC output and triggers µP reset if voltage sags below 4.625V during EMI events or power supply fault. Use Value: 150ms reset timeout exceeds µP boot ROM execution time; push-pull output eliminates pullup resistor, reducing leakage paths in medical-grade isolation design. |
| MP3 Players | Cell Phones (Feature) |
Use Scenario: Flash-based MP3 players using lithium-polymer battery with dynamic voltage scaling (2.8V–4.2V). IC Role / Device Role / Timing Role: Provides clean power-on reset and brownout protection for audio DSP, ensuring no pop/click on startup or shutdown. Use Value: Immunity to 40µs VCC transients prevents reset corruption during headphone insertion noise; SOT23-5 footprint minimizes PCB area in space-constrained designs. |
Use Scenario: Entry-level GSM feature phones with 3.6V Li-ion battery and baseband processor requiring deterministic reset sequencing. IC Role / Device Role / Timing Role: Generates active-high reset signal synchronized to VCC ramp, holding µP in reset until stable 3.6V is achieved. Use Value: Guaranteed reset validity to VCC = +1.1V ensures safe shutdown during battery removal; MR input allows hardware reset button integration without external logic. |
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, open-drain output, 1.5µA ICC | Requires external pullup; higher supply current reduces battery life in coin-cell applications | Select when 3.3V rail monitoring is required and board layout accommodates pullup resistor |
| MAX6326UR29D3+ | 2.93V threshold, 140ms timeout, active-low open-drain, 800nA ICC | Lower threshold and inverted output require redesign of µP reset interface and timing analysis | Choose only if existing design uses 2.93V reference and can accommodate active-low signaling |
Compared with TPS3837K33DBVR and MAX6326UR29D3+, the MAX6855UK46D3+T delivers superior battery longevity due to 170nA current, precise 4.625V threshold for 5V systems, and active-high push-pull output that simplifies µP interface and improves noise margin.
Availability
MAX6855UK46D3+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and feature cell phones requiring stable component supply across extended product lifecycles and low-volume production runs.
Supply support for MAX6855UK46D3+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 consumer applications.
The MAX685x family was designed specifically for ultra-low-power microprocessor supervision in battery-critical portable medical and handheld devices, emphasizing nanoscale current consumption and guaranteed reset behavior under marginal supply conditions.
FAQ
What is the exact reset threshold voltage of MAX6855UK46D3+T?
The MAX6855UK46D3+T has a factory-trimmed reset threshold of +4.625V, with ±2.5% tolerance over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "46" corresponds to 4.625V nominal. The device asserts reset when VCC falls below this threshold and holds reset for the full 150ms timeout after VCC rises above it.
Does MAX6855UK46D3+T include a watchdog timer function?
No, MAX6855UK46D3+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 functionality. The MAX6855UK46D3+T is a manual-reset-only supervisory circuit with MR input and no WDI pin - confirmed by its 5-pin SOT23 pinout showing pins 1 (RESET), 2/4 (GND), 3 (MR), and 5 (VCC).
What is the reset timeout period for MAX6855UK46D3+T?
The MAX6855UK46D3+T has a 150ms minimum reset timeout period, indicated by the "D3" suffix in its part number. Table 4 confirms D3 corresponds to 150ms (min) / 225ms (typ) / 300ms (max). This timeout begins when VCC rises above 4.625V or MR is deasserted, and ensures the microprocessor remains held in reset long enough to complete power stabilization and internal initialization.
Can MAX6855UK46D3+T operate with supply voltages below 2.0V?
Yes, MAX6855UK46D3+T operates from VCC = 1.2V to 5.5V, and its reset output remains valid down to VCC = +1.1V per Electrical Characteristics table. However, the 4.625V threshold means the device will assert reset continuously when VCC < 4.625V - making it suitable for monitoring 5V rails but not lower-voltage domains. For sub-3V systems, other MAX685x variants with lower thresholds (e.g., suffix "16" = 1.575V) should be selected.
What package type and lead finish does MAX6855UK46D3+T use?
MAX6855UK46D3+T uses a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm) with lead-free (RoHS-compliant) finish, as indicated by the "+T" suffix per Ordering Information. The "+T" designation replaces "-T" to specify lead-free packaging, and the device is qualified for reflow soldering per JEDEC J-STD-020 standards.
MAX6855UK46D3+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:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK46D3+T FAQ
1.How can I place an order for MAX6855UK46D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK46D3+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 MAX6855UK46D3+T reliable?
The price and inventory of MAX6855UK46D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK46D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK46D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK46D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK46D3+T?
MAX6855UK46D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK46D3+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 MAX6855UK46D3+T?
For technical support, including MAX6855UK46D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK46D3+T requirements.
6.How does Aetrix verify that MAX6855UK46D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK46D3+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 MAX6855UK46D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK46D3+T?
All MAX6855UK46D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK46D3+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 MAX6855UK46D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK46D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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