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Analog Devices Inc./Maxim Integrated MAX6855UK46D3
- Part No.:
- MAX6855UK46D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK46D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,316
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Product details
Overview
MAX6855UK46D3 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 for brownout detection down to 1.1V and asserts reset during power-up, power-down, or MR assertion - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6855UK46D3 datasheet, MAX6855UK46D3 pinout, MAX6855UK46D3 application, or MAX6855UK46D3 equivalent, key selection criteria include its guaranteed reset validity at VCC = 1.1V, ultra-low 170nA typical supply current, immunity to short VCC transients (<40µs at 100mV overdrive), and compatibility with CMOS-level MR input requiring no external pullup.
Technical Context
The MAX6855UK46D3 implements a precision voltage monitor with hysteresis (0.5% of VTH) and an internal reset timeout timer. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load when asserted, while deasserting to ≥0.8×VCC under 500µA source current.
It features a dedicated MR input with 10kΩ internal pullup, 1µs minimum pulse width requirement, and 250ns MR-to-reset delay. The device operates across -40°C to +85°C and guarantees functional reset assertion even as VCC falls to 1.1V - critical for low-voltage battery systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.625V (factory-trimmed, ±2.5% tolerance) - sets precise brownout detection point for 5V nominal rails |
| Reset Timeout | 150ms (min), 225ms (typ), 300ms (max) - ensures µP completes power stabilization before release |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input battery systems including single Li-ion and dual alkaline |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and interfaces directly to µP reset pins |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies manual reset switch design (no external resistor required) |
| Reset Validity Limit | Guaranteed down to VCC = 1.1V - maintains deterministic reset behavior during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free compatible (RoHS-compliant).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin high during fault; no external pullup needed |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold reference |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; momentary switch to GND initiates reset |
| 4 | GND | Second ground terminal - improves noise immunity; connect to same ground net as Pin 2 |
| 5 | VCC | Supply voltage input - monitored for reset trigger; bypass with 0.1µF ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in always-on portable medical sensors |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C - eliminates need for external calibration in field-deployed devices |
| VCC transient immunity | Immune to <40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy automotive/industrial environments |
| No external components | Self-contained supervision - requires only 0.1µF VCC bypass capacitor; no resistors or timing caps needed |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = 1.1V - ensures reliable reset during end-of-battery discharge |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 7–14 days on single CR2032 cell. IC Role / Device Role / Timing Role: Supervises VCC during battery voltage decay and sensor power sequencing; asserts reset if voltage drops below 4.625V. Use Value: Prevents corrupted sensor data writes during brownout by holding µP in reset until stable power returns - critical for FDA compliance. |
Use Scenario: Portable ECG/SpO₂ logger with sleep mode and wake-on-event functionality. IC Role / Device Role / Timing Role: Provides clean power-on reset and detects VCC sag during flash write operations. Use Value: 150ms timeout ensures ADC reference and analog front-end stabilize before firmware initialization - avoids measurement offset errors. |
| Handheld Medical Diagnostics | Low-Power Wearable Sensors |
Use Scenario: Battery-powered ultrasound probe with intermittent high-current transducer bursts. IC Role / Device Role / Timing Role: Monitors main rail for transient-induced brownout during burst mode; triggers reset if VCC dips below 4.625V. Use Value: 170nA quiescent current minimizes standby drain, extending operational time between charges without compromising fault detection. |
Use Scenario: Skin-contact temperature/humidity patch operating on thin-film battery. IC Role / Device Role / Timing Role: Ensures deterministic reset at VCC = 1.1V - matches minimum operating voltage of ultra-low-power BLE SoC. Use Value: Eliminates risk of undefined µP state during deep discharge, preventing firmware lockup or memory corruption. |
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 multi-year deployments | Select when cost sensitivity outweighs battery life requirements and 3.3V rail supervision suffices |
| MAX6369KA29D3+ | 2.93V reset threshold; 140ms timeout; push-pull active-low output; 1.2µA ICC | Active-low logic incompatible with µPs requiring active-high reset; higher ICC increases standby load | Choose only if existing PCB uses active-low reset interface and 2.93V threshold matches system VDD |
Compared with TPS3837K33DBVR and MAX6369KA29D3+, the MAX6855UK46D3 delivers superior energy efficiency (170nA vs. >1µA), precise 4.625V threshold for 5V systems, and active-high push-pull output eliminating BOM cost and layout area for pullup resistors.
Availability
MAX6855UK46D3 is available at Aetrix Electronics and suitable for portable medical diagnostics, battery-powered patient monitors, and low-power wearable health sensors requiring stable component supply across long product lifecycles.
Supply support for MAX6855UK46D3 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 and mixed-signal ICs for demanding industrial, medical, and communications applications - emphasizing low power, high reliability, and small form factor.
The MAX6855UK46D3 belongs to the MAX6854–MAX6869 nanopower supervisory family, engineered specifically for battery-critical applications where sub-µA quiescent current and guaranteed low-VCC reset behavior are mandatory.
FAQ
What is the exact reset threshold voltage of MAX6855UK46D3?
The MAX6855UK46D3 has a factory-trimmed reset threshold of 4.625V, with ±2.5% tolerance over -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 typical. The device asserts reset when VCC falls below this threshold and holds reset for the full timeout period after VCC rises above it.
Does MAX6855UK46D3 include a watchdog timer function?
No, the MAX6855UK46D3 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 provides voltage monitoring, manual reset input (MR), and fixed reset timeout - making it a dedicated supervisor without watchdog capability.
What is the reset output configuration of MAX6855UK46D3?
The MAX6855UK46D3 features an active-high push-pull reset output (Pin 1). Unlike open-drain variants, it actively drives HIGH during reset assertion and LOW during deassertion - requiring no external pullup resistor. This configuration directly interfaces with µPs that accept active-high reset signals, simplifying board design and reducing component count.
Can MAX6855UK46D3 operate reliably at VCC = 1.2V?
Yes, the MAX6855UK46D3 is fully specified to operate at VCC = 1.2V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Its reset output remains valid down to VCC = 1.1V, and supply current is characterized at 1.2V (190nA typ). This makes it suitable for single-cell lithium or alkaline systems nearing end-of-life discharge.
What is the minimum manual reset pulse width required for MAX6855UK46D3?
The MAX6855UK46D3 requires a minimum MR pulse width of 1µs to reliably trigger reset, as specified in the Electrical Characteristics table under "MR Minimum Pulse Width (tMPW)". The device also provides 200ns glitch rejection, ensuring noise spikes on the MR line do not cause unintended resets - critical in handheld medical devices subject to ESD events.
MAX6855UK46D3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- 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 FAQ
1.How can I place an order for MAX6855UK46D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK46D3 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 reliable?
The price and inventory of MAX6855UK46D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK46D3 is usually 5 days.
3.What payment methods are accepted for MAX6855UK46D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK46D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK46D3?
MAX6855UK46D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK46D3 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?
For technical support, including MAX6855UK46D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK46D3 requirements.
6.How does Aetrix verify that MAX6855UK46D3 is sourced from the original manufacturer or authorized distributors?
All MAX6855UK46D3 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 meets industry standards.
7.What is the process for return or replacement of MAX6855UK46D3?
All MAX6855UK46D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK46D3, 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 part is unused and in its original packaging.
Return procedure for MAX6855UK46D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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