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Analog Devices Inc./Maxim Integrated MAX6865UK18D2S+T
- Part No.:
- MAX6865UK18D2S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK18D2S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,431
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Product details
Overview
MAX6865UK18D2S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.8V reset threshold (±2.5%), 40ms minimum reset timeout, and integrated watchdog timer with 3.3s typical timeout. It monitors VCC, responds to manual reset (MR), and asserts active-high push-pull RESET during brownout or watchdog expiration - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK18D2S+T datasheet, MAX6865UK18D2S+T pinout, MAX6865UK18D2S+T application, or MAX6865UK18D2S+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, MR glitch rejection (200ns), and compatibility with 1.2V–5.5V supply rails in space-constrained portable systems.
Technical Context
The MAX6865UK18D2S+T implements a precision bandgap-based voltage monitor with 0.5% hysteresis, a digital watchdog timer cleared on WDI edge transitions, and a fixed 40ms reset timeout after VCC recovery or MR deassertion. Its internal 10kΩ MR pullup and CMOS-compatible WDI input enable direct interfacing with µP GPIO without external biasing.
Unlike basic supervisors, it combines three independent reset triggers - VCC undervoltage, manual reset assertion, and watchdog timeout - with synchronized timing control. The active-high push-pull RESET output drives directly into µP reset inputs without external pullups, and remains valid across full -40°C to +85°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries in always-on patient monitors. |
| Reset Threshold | 1.800V ±2.5% - factory-trimmed for precise brownout detection at Li-ion single-cell discharge knee. |
| Reset Timeout | 40ms min - ensures µP completes power-rail stabilization before release from reset state. |
| Watchdog Timeout | 3.3s typ (S-suffix) - provides robust software hang detection without excessive CPU polling overhead. |
| VCC Range | 1.2V to 5.5V - supports operation across wide-input DC-DC outputs and legacy 3.3V/5V rails. |
| RESET Validity | Down to VCC = +1.1V - guarantees deterministic reset assertion during deep brownout conditions. |
| MR Glitch Rejection | 200ns - suppresses EMI-induced false resets in noisy handheld environments. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, RoHS-compliant, 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives µP reset input directly; no external pullup required; VOH ≥ 0.8×VCC at 500µA source. |
| 2 | GND | Ground reference - must connect to system ground plane; shared return for all internal circuits. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic; 1µs minimum pulse width. |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on transition; rejects pulses <150ns. |
| 5 | VCC | Supply and monitored rail - powers device and serves as reset trigger source; bypass with 0.1µF ceramic to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose meters using CR2032 cells. |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C ensures reliable brownout detection across environmental extremes. |
| No external components | Integrated MR pullup, precision voltage reference, and watchdog oscillator eliminate BOM cost and layout area. |
| VCC transient immunity | Immune to 100mV VCC glitches ≤40µs - prevents spurious resets in electrically noisy portable enclosures. |
| Guaranteed RESET validity | RESET output functional down to VCC = +1.1V - critical for fail-safe behavior during deep undervoltage events. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission in disposable wearable patches. IC Role / Device Role / Timing Role: Supervises MCU power-up sequencing, detects firmware hangs via WDI, and asserts RESET during battery voltage sag below 1.8V. Use Value: Prevents corrupted sensor data uploads by ensuring MCU only operates within validated voltage window and recovers automatically from lockups. |
Use Scenario: Portable ECG/SpO₂ recorder with rechargeable Li-ion battery and low-power sleep mode. IC Role / Device Role / Timing Role: Monitors main 3.3V rail, initiates hard reset on brownout, and validates MCU reset integrity down to 1.1V during deep discharge. Use Value: Eliminates risk of silent MCU malfunction during critical measurement windows by enforcing deterministic reset behavior under marginal supply conditions. |
| Handheld Medical Diagnostics | Industrial Portable Testers |
Use Scenario: Battery-powered ultrasound probe with FPGA-based signal processing and real-time display. IC Role / Device Role / Timing Role: Provides coordinated reset to FPGA and ARM Cortex-M host; uses MR for technician-initiated calibration reset. Use Value: Ensures synchronized initialization of heterogeneous processors and avoids partial configuration states that cause hardware lockup. |
Use Scenario: Ruggedized multimeter with isolated analog front-end and wireless reporting. IC Role / Device Role / Timing Role: Supervises isolated 5V DC-DC output; asserts RESET on input undervoltage and watches firmware execution via WDI toggling. Use Value: Guarantees measurement integrity by preventing analog acquisition during unstable power or unresponsive firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | Fixed 3.3V reset threshold; no watchdog; 200ms reset timeout; 1.6µA ICC. | Lacks WDI functionality; suitable only for simple power-monitoring, not code-execution supervision. | Select when watchdog capability is unnecessary and higher ICC is acceptable for cost-sensitive designs. |
| MAX6369KA29+T | 1.8V threshold; 200ms timeout; no MR input; 1.2µA ICC; open-drain RESET. | Requires external pullup; no manual reset provision; lower integration than MAX6865UK18D2S+T. | Choose for ultra-low-cost implementations where MR and push-pull drive are nonessential. |
Compared with TPS3836K33DBVR and MAX6369KA29+T, the MAX6865UK18D2S+T uniquely delivers nanopower consumption, integrated watchdog, manual reset, and active-high push-pull RESET in one 5-pin SOT23 - enabling compact, self-recovering medical devices without compromising battery life.
Availability
MAX6865UK18D2S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and handheld medical diagnostics requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for MAX6865UK18D2S+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 demanding industrial, medical, and automotive applications, with emphasis on low-power, high-reliability solutions.
The MAX68xx family targets battery-critical portable electronics, delivering nanopower supervision with integrated watchdog and manual reset - specifically engineered for medical wearables and diagnostic tools where safety and uptime are paramount.
FAQ
What is the exact reset threshold voltage of MAX6865UK18D2S+T?
The MAX6865UK18D2S+T has a factory-trimmed reset threshold of 1.800V with ±2.5% tolerance over -40°C to +85°C, corresponding to the "18" suffix per Maxim's Threshold Suffix Guide. This value is laser-trimmed during production and guaranteed in the Electrical Characteristics table under VTH parameter.
Does MAX6865UK18D2S+T require external components for basic operation?
No, the MAX6865UK18D2S+T requires no external components for core functionality: it includes an internal 10kΩ MR pullup resistor, precision voltage reference, and watchdog oscillator. Only a 0.1µF ceramic capacitor from VCC to GND is recommended for noise suppression - no resistors, capacitors, or additional ICs are needed.
What is the watchdog timeout behavior of MAX6865UK18D2S+T?
The MAX6865UK18D2S+T features a watchdog timeout period of 3.3s typical (S-suffix), with min/max of 1.5s/7.75s. The timer resets on any rising or falling edge at WDI and expires only if WDI remains static beyond this period, triggering a full reset timeout cycle - distinct from simpler windowed watchdogs.
Can MAX6865UK18D2S+T operate with VCC below 1.8V?
Yes, the MAX6865UK18D2S+T operates with VCC as low as 1.2V and guarantees RESET assertion validity down to VCC = +1.1V. However, reset deassertion occurs only after VCC rises above 1.8V (threshold) plus hysteresis, so sustained operation below 1.8V keeps the device in reset - a designed safety feature.
Is MAX6865UK18D2S+T pin-compatible with other MAX68xx variants?
The MAX6865UK18D2S+T shares the identical 5-pin SOT23-5 pinout with all MAX6864–MAX6869 devices (e.g., MAX6864, MAX6866), including RESET (pin 1), GND (pin 2), MR (pin 3), WDI (pin 4), and VCC (pin 5). Pin compatibility is confirmed in the Pin Configurations section and Selector Guide.
MAX6865UK18D2S+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:
- 1.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK18D2S+T FAQ
1.How can I place an order for MAX6865UK18D2S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK18D2S+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 MAX6865UK18D2S+T reliable?
The price and inventory of MAX6865UK18D2S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK18D2S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK18D2S+T?
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4.How is shipping managed for MAX6865UK18D2S+T?
MAX6865UK18D2S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK18D2S+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 MAX6865UK18D2S+T?
For technical support, including MAX6865UK18D2S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK18D2S+T requirements.
6.How does Aetrix verify that MAX6865UK18D2S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK18D2S+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 MAX6865UK18D2S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK18D2S+T?
All MAX6865UK18D2S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK18D2S+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 MAX6865UK18D2S+T part is unused and in its original packaging.
Return procedure for MAX6865UK18D2S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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