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Analog Devices Inc./Maxim Integrated MAX6865UK45D4S+T
- Part No.:
- MAX6865UK45D4S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK45D4S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,996
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Product details
Overview
The MAX6865UK45D4S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring, manual reset input (MR), and watchdog timer (WDI) functionality. It asserts an active-high push-pull RESET output when VCC drops below 4.500V (typ), MR is pulled low, or the watchdog times out after 3.3s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset operation down to VCC = +1.1V - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK45D4S+T datasheet, MAX6865UK45D4S+T pinout, MAX6865UK45D4S+T application, or MAX6865UK45D4S+T equivalent, key selection criteria include its 4.5V reset threshold, 1200ms minimum reset timeout (D4), S-suffix 3.3s watchdog period, active-high push-pull RESET output, and immunity to short VCC transients - all confirmed for this exact variant per Maxim's ordering guide and electrical specifications.
Technical Context
This device implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over temperature, coupled with a digital watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 3.3s (typ). Its internal 10kΩ MR pullup and glitch rejection (200ns) enable robust manual reset without external components.
The reset assertion logic combines three independent triggers - VCC undervoltage, MR assertion, or watchdog timeout - with synchronized deassertion after a fixed 1200ms timeout. The active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA, ensuring reliable µP reset signaling across 1.2V–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.500V (typ), ±2.5% tolerance - ensures reliable brownout detection for 4.5V nominal rails |
| Reset Timeout Period | 1200ms (min), D4 option - holds µP in reset long enough for full power stabilization |
| Watchdog Timeout | 3.3s (typ), S-suffix - provides fault coverage for firmware loops exceeding ~3 seconds |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in always-on medical sensors |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V systems without level-shifting |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and simplifies interface to µP reset pin |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains reset integrity during deep brownout conditions |
Pinout & Package
MAX6865UK45D4S+T is housed in a lead-free 5-pin SOT23-5 package (JEDEC MO-178AA), with 0.95mm pitch and 2.9mm × 1.6mm footprint. Pin 1 is marked with a dot; pin numbering follows standard SOT23 orientation (counterclockwise from mark).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin directly; no external pullup required |
| 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 (10kΩ); accepts CMOS logic levels |
| 4 | WDI | Watchdog input - edge-sensitive; clears internal timer on rising/falling transitions; rejects <150ns pulses |
| 5 | VCC | Supply voltage input - monitored for reset generation; requires 0.1µF bypass capacitor to GND |
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 | 4.500V ±2.5% - eliminates calibration overhead and reduces BOM count |
| Integrated watchdog timer | 3.3s typical timeout with edge-triggered clear - detects firmware hangs without software polling |
| No external components required | Internal MR pullup (10kΩ), no timing capacitors - reduces PCB area and assembly cost |
| VCC transient immunity | Immune to 100mV/40µs VCC glitches - prevents spurious resets in noisy automotive or industrial environments |
Applications
| Glucose Monitor Power Management | Patient Monitor Brownout Protection |
|---|---|
|
Use Scenario: Continuous glucose sensing with coin-cell battery and low-power MCU. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to hold MCU in known state during battery voltage sag. Use Value: 170nA quiescent current preserves battery capacity; 4.5V threshold ensures reset before ADC reference collapse. |
Use Scenario: Portable ECG device operating from rechargeable Li-ion with variable load. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcing safe shutdown during brownout or firmware lockup. Use Value: 1200ms reset timeout allows full analog front-end stabilization; 3.3s watchdog covers longest diagnostic routine. |
| MP3 Player Firmware Recovery | Cell Phone Baseband Reset Coordination |
|
Use Scenario: Flash-based audio player with frequent sleep/wake cycles and firmware updates. IC Role / Device Role / Timing Role: Dual-trigger reset generator responding to both VCC dip and unresponsive CPU via WDI. Use Value: Active-high push-pull RESET interfaces directly to baseband processor reset pin; no level shifter needed. |
Use Scenario: Multi-rail smartphone platform where baseband SoC requires coordinated reset sequencing. IC Role / Device Role / Timing Role: Independent reset supervisor for baseband domain, decoupled from application processor supervision. Use Value: Guaranteed reset validity to VCC = +1.1V ensures clean reset even during rapid battery discharge under RF transmit load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK45D4S+T | Same 4.5V threshold, 1200ms timeout, and 3.3s watchdog, but features active-low push-pull RESET output | Requires inverted reset logic on µP side; incompatible with active-high-only reset inputs | Select only if target µP accepts active-low reset and board layout accommodates signal inversion |
| TPS3836K33DBVR | 3.3V fixed threshold, no watchdog, 200ms reset timeout, SOT23-5 package, 1.6µA ICC | Lacks watchdog and manual reset; suited only for basic voltage monitoring without firmware safety coverage | Choose when cost sensitivity outweighs functional safety requirements and system operates strictly at 3.3V |
Compared with MAX6865UK45D4S+T, MAX6864UK45D4S+T offers identical supervision parameters but inverted reset polarity, while TPS3836K33DBVR trades watchdog capability and ultra-low current for lower unit cost and simpler implementation in non-safety-critical 3.3V systems.
Availability
MAX6865UK45D4S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and low-power embedded controllers requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6865UK45D4S+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 and mixed-signal ICs for power, sensing, and connectivity in demanding industrial, medical, and automotive applications.
The MAX6854–MAX6869 family delivers nanopower supervisory functions targeting battery-operated medical and portable electronics, emphasizing ultra-low ICC, guaranteed reset validity at low VCC, and integrated watchdog safety.
FAQ
What is the exact reset threshold voltage of the MAX6865UK45D4S+T?
The MAX6865UK45D4S+T has a factory-trimmed reset threshold of 4.500V (typical), with ±2.5% tolerance over temperature and supply voltage. This value is confirmed by Maxim's Threshold Suffix Guide (suffix "45") and electrical characteristics table, and applies specifically to the MAX6865UK45D4S+T variant - not the broader MAX6865 family.
Does the MAX6865UK45D4S+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6865UK45D4S+T includes a watchdog timer with a typical timeout period of 3.3s, indicated by the "S" suffix in the part number. This is verified in Table 3 (Watchdog Timeout) and the Ordering Information section, which explicitly assigns "S" to 1.5s/3.3s/7.75s min/typ/max - confirming 3.3s typical for this exact MAX6865UK45D4S+T orderable part.
What type of RESET output does the MAX6865UK45D4S+T provide, and how is it configured?
The MAX6865UK45D4S+T provides an active-high push-pull RESET output, as confirmed by its position in the Selector Guide (row MAX6865, column "Push-Pull ACTIVE HIGH") and the MAX6865-specific pin description. This configuration eliminates the need for an external pullup resistor and directly drives µP reset pins requiring high-voltage assertion.
What is the minimum reset timeout period for the MAX6865UK45D4S+T, and how is it selected?
The MAX6865UK45D4S+T has a fixed minimum reset timeout period of 1200ms, denoted by the "D4" suffix in its part number. This is validated in Table 4 (Reset Timeout Periods), where D4 corresponds to 1200ms/1800ms/2400ms (min/typ/max), and applies exclusively to this variant - no external configuration or pin strapping is required.
Is the MAX6865UK45D4S+T compatible with 1.8V or 2.5V supply rails, and what is its lowest valid operating voltage?
Yes, the MAX6865UK45D4S+T operates from 1.2V to 5.5V and guarantees valid RESET output down to VCC = +1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Its 170nA typical supply current at 1.8V and robust performance across this range make it suitable for multi-voltage portable systems including those using 1.8V or 2.5V logic domains.
MAX6865UK45D4S+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:
- 4.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK45D4S+T FAQ
1.How can I place an order for MAX6865UK45D4S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK45D4S+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 MAX6865UK45D4S+T reliable?
The price and inventory of MAX6865UK45D4S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK45D4S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK45D4S+T?
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4.How is shipping managed for MAX6865UK45D4S+T?
MAX6865UK45D4S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK45D4S+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 MAX6865UK45D4S+T?
For technical support, including MAX6865UK45D4S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK45D4S+T requirements.
6.How does Aetrix verify that MAX6865UK45D4S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK45D4S+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 MAX6865UK45D4S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK45D4S+T?
All MAX6865UK45D4S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK45D4S+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 MAX6865UK45D4S+T part is unused and in its original packaging.
Return procedure for MAX6865UK45D4S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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