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Analog Devices Inc./Maxim Integrated MAX6865UK22D3S+T
- Part No.:
- MAX6865UK22D3S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK22D3S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,151
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Product details
Overview
The MAX6865UK22D3S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 2.235V reset threshold (suffix '22'), 150ms minimum reset timeout (suffix 'D3'), and watchdog timer with 3.3s typical timeout (suffix 'S'). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout - used in battery-powered medical and portable electronics for reliable power-on/power-fail sequencing.
For engineers reviewing the MAX6865UK22D3S+T datasheet, MAX6865UK22D3S+T pinout, MAX6865UK22D3S+T application, or MAX6865UK22D3S+T equivalent, key selection criteria include its 2.235V threshold accuracy over temperature, guaranteed reset validity down to VCC = +1.1V, 250ns MR-to-reset delay, and compatibility with noisy low-voltage systems requiring <200nA quiescent current.
Technical Context
The MAX6865UK22D3S+T integrates voltage monitoring, manual reset input (MR), and a watchdog timer with 3.3s typical timeout (S-suffix) into a single BiCMOS IC. Its reset assertion logic combines three independent triggers: VCC falling below 2.235V ±2.5%, MR pulled low, or WDI inactivity exceeding watchdog period - all forcing active-low push-pull RESET output for ≥150ms after recovery.
It uses internal 10kΩ MR pullup and supports noise-immune operation via guaranteed immunity to ≤40µs VCC transients at 100mV overdrive. The device operates across -40°C to +85°C and maintains valid reset signaling down to VCC = 1.1V, enabling robust brownout protection in sub-1.8V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C; enables multi-year battery life in always-on portable devices. |
| Reset Threshold Voltage | 2.235V ±2.5%; factory-trimmed for precise brownout detection at 2.2V rail systems. |
| Reset Timeout Period | 150ms minimum (D3); ensures µP completes full initialization before release from reset. |
| Watchdog Timeout | 3.3s typical (S-suffix); balances fault coverage and software execution margin in embedded firmware. |
| VCC Operating Range | 1.2V to 5.5V; supports direct monitoring of 1.8V, 2.5V, 3.3V, and 5V rails without external scaling. |
| Reset Output Type | Push-pull active-high; eliminates need for external pullup and simplifies interface to µP reset inputs. |
| MR Input Logic | Active-low with 10kΩ internal pullup; allows direct switch-to-GND connection without external components. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint-compatible with industry-standard 5-pin SOT23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high during reset assertion, referenced to VCC, sinks/source up to 1.2mA. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS-level signals or momentary switch to GND. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on each transition; requires toggling within 3.3s to prevent reset. |
| 5 | VCC | Supply and monitored voltage input; bypass with 0.1µF ceramic capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell-powered glucose monitors. |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V - critical for detecting final brownout phase before shutdown. |
| Watchdog glitch immunity | WDI detects pulses as short as 150ns and ignores noise spikes, preventing false resets in EMI-prone environments. |
| No external components | Integrated MR pullup, precision voltage reference, and timeout generator eliminate discrete BOM items and layout area. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - avoids spurious resets during switching regulator ripple or load transients. |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Glucose meters and patient monitors operating from single CR2032 coin cells with intermittent usage over multi-year lifetimes. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection at 2.2V, and watchdog supervision of firmware execution. Use Value: 170nA quiescent current extends battery life beyond 5 years; 150ms reset timeout ensures reliable µP boot sequence after cold start. |
Use Scenario: Wireless environmental sensors deployed in remote locations, powered by primary Li-SOCl₂ batteries with 10+ year shelf life. IC Role / Device Role / Timing Role: System supervisor asserting reset on VCC drop below 2.235V and triggering recovery if firmware hangs during BLE transmission. Use Value: 3.3s watchdog timeout aligns with sensor's wake-up interval and communication duty cycle, minimizing false triggers while ensuring timely recovery. |
| Wearables & Fitness Trackers | Low-Voltage Industrial Controllers |
Use Scenario: Compact wrist-worn devices using 1.8V SoCs and rechargeable Li-ion cells subject to voltage sag under pulse loads. IC Role / Device Role / Timing Role: Voltage monitor and reset controller that asserts active-high RESET when VCC falls below 2.235V or MR is activated. Use Value: Valid reset signaling down to VCC = 1.1V prevents undefined µP states during deep discharge; 250ns MR delay enables fast hardware-initiated recovery. |
Use Scenario: Programmable logic controllers (PLCs) with 2.5V FPGA configuration rails and strict IEC 61000-4-4 ESD immunity requirements. IC Role / Device Role / Timing Role: Brownout protector and watchdog enforcer interfacing directly to FPGA reset pin with push-pull drive strength. Use Value: Push-pull active-high RESET eliminates external pullup resistor, reducing component count and improving noise margin in industrial EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK22D3S+T | No CT pin; identical 2.235V threshold, 150ms timeout, and 3.3s watchdog - but lacks pin-selectable timeout option. | Suitable where fixed timeout suffices; no CT routing needed on PCB. | Select MAX6864UK22D3S+T if CT functionality is unused and BOM simplification is prioritized. |
| TPS3836K22DBVR | 2.2V threshold, 200ms timeout, no watchdog; 1.2µA ICC (7x higher than MAX6865UK22D3S+T). | Applicable in non-watchdog systems where ultra-low ICC is not required. | Choose TPS3836K22DBVR only if existing TI-based designs mandate pin compatibility and watchdog is handled externally. |
Compared with MAX6865UK22D3S+T, MAX6864UK22D3S+T removes CT functionality while retaining identical supervision parameters, whereas TPS3836K22DBVR trades nanopower operation and integrated watchdog for TI ecosystem alignment and simpler timing architecture.
Availability
MAX6865UK22D3S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, wearables, low-voltage industrial controllers, and glucose monitoring equipment requiring stable component supply with long-term lifecycle support.
Supply support for MAX6865UK22D3S+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6865UK22D3S+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for ultra-low-power, battery-critical systems requiring guaranteed reset behavior across wide temperature and voltage ranges.
FAQ
What is the exact reset threshold voltage of the MAX6865UK22D3S+T?
The MAX6865UK22D3S+T has a factory-trimmed reset threshold voltage of 2.235V, with ±2.5% tolerance over -40°C to +85°C. This value is confirmed by the '22' suffix in the part number per Maxim's Threshold Suffix Guide (Table 2), and is validated in the Electrical Characteristics table under VTH parameter.
Does the MAX6865UK22D3S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK22D3S+T includes a watchdog timer with a typical timeout of 3.3s, indicated by the 'S' suffix in the part number. The datasheet specifies this as the 'S' option in Table 3 (Watchdog Timeout), with min/typ/max values of 1.5s/3.3s/7.75s - making it suitable for firmware supervision in mid-interval polling applications.
What is the reset timeout period of the MAX6865UK22D3S+T, and how is it set?
The MAX6865UK22D3S+T has a fixed 150ms minimum reset timeout period, denoted by the 'D3' suffix. This value is factory-programmed and cannot be altered externally - unlike MAX6861–MAX6863 variants which use the CT pin for selection. The datasheet confirms D3 corresponds to 150ms/225ms/300ms (min/typ/max) in Table 4.
What type of reset output does the MAX6865UK22D3S+T provide?
The MAX6865UK22D3S+T provides an active-high push-pull reset output on Pin 1. This is confirmed by its position in the Selector Guide (row MAX6865) and Pin Description section, which states "RESET: Active-High Push-Pull Reset Output" - eliminating need for external pullup resistors and simplifying interface to most µP reset inputs.
Is the MAX6865UK22D3S+T compatible with 1.8V supply systems?
Yes, the MAX6865UK22D3S+T operates across 1.2V to 5.5V and is fully specified at 1.8V, including 170nA typical supply current and valid reset assertion down to VCC = 1.1V. Its 2.235V threshold is ideal for monitoring 2.5V or 3.3V rails, but it can supervise lower rails when used with external resistor dividers - though the datasheet confirms direct 1.8V operation is supported.
MAX6865UK22D3S+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:
- 2.188V
- 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
MAX6865UK22D3S+T FAQ
1.How can I place an order for MAX6865UK22D3S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK22D3S+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 MAX6865UK22D3S+T reliable?
The price and inventory of MAX6865UK22D3S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK22D3S+T is usually 5 days.
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Once your MAX6865UK22D3S+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 MAX6865UK22D3S+T?
For technical support, including MAX6865UK22D3S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK22D3S+T requirements.
6.How does Aetrix verify that MAX6865UK22D3S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK22D3S+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 MAX6865UK22D3S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK22D3S+T?
All MAX6865UK22D3S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK22D3S+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 MAX6865UK22D3S+T part is unused and in its original packaging.
Return procedure for MAX6865UK22D3S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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