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Analog Devices Inc./Maxim Integrated MAX6865UK30D1S+T
- Part No.:
- MAX6865UK30D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK30D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,824
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Product details
Overview
MAX6865UK30D1S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and watchdog timer with 3.3s typical timeout. It monitors VCC down to +1.1V, asserts reset when supply drops below factory-trimmed 3.000V threshold, and guarantees ultra-low 170nA typical supply current at 2.5V. Used in battery-powered glucose monitors and portable medical devices for reliable power-on reset and software fault recovery.
For engineers reviewing the MAX6865UK30D1S+T datasheet, MAX6865UK30D1S+T pinout, MAX6865UK30D1S+T application, or MAX6865UK30D1S+T equivalent, this page delivers verified functional identity, exact reset threshold (3.000V), watchdog timeout (3.3s typ), reset output type (active-high push-pull), and MR timing behavior - all confirmed from Maxim's official datasheet Rev 4 (12/05).
Technical Context
The MAX6865UK30D1S+T implements a dual-trigger reset architecture: VCC monitoring with ±2.5% threshold accuracy and edge-sensitive watchdog timer that clears on any WDI transition. Its internal 10kΩ MR pullup enables direct switch interface without external components, and reset remains asserted for 10ms minimum after VCC recovery or MR release.
Watchdog timeout is fixed at 3.3s (typ) per suffix 'S', with guaranteed immunity to transients ≤40µs at 100mV overdrive. The device operates across -40°C to +85°C and maintains valid reset assertion down to VCC = +1.1V, supporting brownout detection in low-voltage embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.000V ±2.5% - precisely trimmed to monitor 3.0V rails; ensures deterministic reset during 3.3V system brownout. |
| Supply Current | 170nA (typ) at 2.5V - enables >10-year battery life in coin-cell–powered patient monitors. |
| Reset Timeout | 10ms (min) - provides sufficient hold time for µP initialization before release. |
| Watchdog Timeout | 3.3s (typ) - balances fault detection responsiveness with software execution margin. |
| Operating Temp | -40°C to +85°C - qualified for industrial and portable medical equipment environments. |
| VCC Range | 1.2V to 5.5V - supports operation across Li-ion, alkaline, and regulated 3.3V/2.5V supplies. |
| Reset Output Type | Active-high push-pull - drives µP reset pin directly without external pullup; compatible with standard CMOS inputs. |
Pinout & Package
Package: 5-pin SOT23 (lead-free, +T suffix), footprint-compatible with industry-standard 5-lead SOT-23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; sinks/source current per VOH/VOL specs; no external pullup needed. |
| 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 or momentary switch to GND. |
| 4 | WDI | Watchdog input - edge-triggered; resets internal timer on rising/falling edges; rejects pulses <150ns. |
| 5 | VCC | Supply voltage input - monitored rail; requires 0.1µF 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 batteries in portable diagnostics. |
| Guaranteed reset validity | Reset output remains functional down to VCC = +1.1V - ensures fail-safe behavior during deep brownout. |
| No external components | Integrated 10kΩ MR pullup and no timing capacitors required - reduces BOM count and PCB area. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments. |
| Watchdog edge sensitivity | Detects WDI transitions as short as 150ns - supports high-frequency software heartbeat signals without missing timeouts. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose meters powered by single coin-cell batteries operating in variable ambient temperatures. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and software watchdog to recover from firmware lockups during sensor calibration. Use Value: 170nA quiescent current extends battery life beyond 2 years; 3.000V threshold matches 3.3V LDO output; 10ms reset pulse satisfies µP POR requirements. |
Use Scenario: Portable ECG or SpO₂ monitors used in home healthcare with intermittent wireless transmission. IC Role / Device Role / Timing Role: Reset controller ensuring deterministic startup after battery insertion and detecting firmware hangs during BLE connection attempts. Use Value: 3.3s watchdog timeout allows full BLE stack handshake before reset; active-high RESET directly interfaces with ARM Cortex-M reset pin. |
| Industrial Handheld Scanners | Smart Wearable Sensors |
|
Use Scenario: Rugged barcode scanners subjected to mechanical shock and ESD events in warehouse environments. IC Role / Device Role / Timing Role: Fault-tolerant supervisor asserting reset on VCC dip caused by motor-induced supply sag or ESD-induced latch-up. Use Value: Immunity to 40µs transients prevents false resets during motor commutation; MR pin enables hardware-initiated recalibration. |
Use Scenario: Fitness trackers with motion-sensing ASICs and Bluetooth LE radios operating on 3.0V nominal supply. IC Role / Device Role / Timing Role: Dual-function supervisor monitoring both main supply and enabling periodic firmware sanity checks via WDI toggling. Use Value: Push-pull active-high RESET eliminates need for level-shifting; 3.000V threshold aligns with discharged LiPo cutoff voltage for graceful shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK30D1S+T | Active-low push-pull RESET output instead of active-high; identical threshold, timeout, and watchdog specs. | Requires inverted reset logic on µP side or external inverter; unsuitable for µPs with dedicated active-high reset pins. | Select MAX6864UK30D1S+T only if target µP accepts active-low reset or board layout already uses open-drain pullup. |
| TPS3836K33DBVR | Fixed 3.08V reset threshold (±0.5%), 200ms min reset timeout, no watchdog timer, 4.5µA ICC. | Lacks software fault detection capability; higher supply current limits battery lifetime in always-on devices. | Choose TPS3836K33DBVR only for cost-sensitive, non-watchdog applications where 3.08V threshold and longer reset hold time are acceptable. |
Compared with MAX6864UK30D1S+T, the MAX6865UK30D1S+T eliminates level-shifting overhead for active-high µP reset inputs; versus TPS3836K33DBVR, it adds critical watchdog functionality and cuts supply current by >26× - essential for multi-year wearable deployments.
Availability
MAX6865UK30D1S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered industrial scanners, and smart wearables requiring stable component supply with long-term lifecycle assurance.
Supply support for MAX6865UK30D1S+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 management, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-critical portable systems, integrating voltage monitoring, manual reset, and watchdog functions into minimal 5-pin SOT23 footprint.
FAQ
What is the exact reset threshold voltage of the MAX6865UK30D1S+T?
The MAX6865UK30D1S+T has a factory-trimmed reset threshold of 3.000V with ±2.5% tolerance over -40°C to +85°C, as defined by the '30' suffix in the part number and confirmed in Table 2 of the Maxim datasheet Rev 4. This value is guaranteed at VCC ≥1.2V and ensures reliable detection of 3.3V rail brownout conditions.
Does the MAX6865UK30D1S+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6865UK30D1S+T includes a watchdog timer with a typical timeout period of 3.3 seconds, indicated by the 'S' suffix in the part number. The timer resets on any rising or falling edge at the WDI pin and expires only if WDI remains static longer than this period, triggering a full reset sequence.
What type of reset output does the MAX6865UK30D1S+T provide, and how is it configured?
The MAX6865UK30D1S+T provides an active-high push-pull reset output on Pin 1. Unlike open-drain variants, it sources and sinks current directly - eliminating the need for an external pullup resistor and enabling direct interface with µP reset pins expecting active-high assertion.
What is the minimum reset timeout period for the MAX6865UK30D1S+T, and how is it set?
The MAX6865UK30D1S+T has a fixed minimum reset timeout period of 10ms, specified by the 'D1' suffix. This duration is factory-programmed and cannot be altered externally; it ensures sufficient reset hold time for microcontroller power-up initialization sequences.
How does the MAX6865UK30D1S+T handle manual reset input (MR) timing and noise immunity?
The MAX6865UK30D1S+T features an internally pulled-up MR pin (10kΩ to VCC) with 250ns MR-to-reset delay and 200ns glitch rejection. It accepts CMOS-level signals or momentary switches to GND, and requires no external debounce - simplifying hardware design while maintaining robustness against contact bounce and EMI.
MAX6865UK30D1S+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:
- 3V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK30D1S+T FAQ
1.How can I place an order for MAX6865UK30D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK30D1S+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 MAX6865UK30D1S+T reliable?
The price and inventory of MAX6865UK30D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK30D1S+T is usually 5 days.
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Once your MAX6865UK30D1S+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 MAX6865UK30D1S+T?
For technical support, including MAX6865UK30D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK30D1S+T requirements.
6.How does Aetrix verify that MAX6865UK30D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK30D1S+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 MAX6865UK30D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK30D1S+T?
All MAX6865UK30D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK30D1S+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 MAX6865UK30D1S+T part is unused and in its original packaging.
Return procedure for MAX6865UK30D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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