My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6865UK44D2S+T
- Part No.:
- MAX6865UK44D2S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK44D2S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,571
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6865UK44D2S+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 4.266V reset threshold (±2.5%), and 40ms minimum reset timeout. It integrates manual reset input (MR), watchdog timer with 3.3s typical timeout, and push-pull active-high RESET output - designed for reliable power-on reset and brownout protection in battery-critical systems like glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK44D2S+T datasheet, MAX6865UK44D2S+T pinout, MAX6865UK44D2S+T application, or MAX6865UK44D2S+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), watchdog pulse detection capability (≥150ns), and lead-free SOT23-5 packaging compliant with RoHS requirements.
Technical Context
This device implements a precision voltage monitor with hysteresis (0.5% of VTH), a monostable reset timeout generator (tRP = 40ms min), and an edge-triggered watchdog timer that clears on any WDI transition (rising or falling) and expires if WDI remains static beyond 3.3s (typ). The internal MR pullup is 10kΩ, and reset assertion is guaranteed even as VCC falls to 1.1V.
The MAX6865UK44D2S+T belongs to the MAX6864–MAX6869 variant group with active-high push-pull RESET, manual reset input, and watchdog timer enabled. Its watchdog timeout is fixed at S-suffix (3.3s typ), and reset threshold is fixed at 44-suffix (4.266V min / 4.375V typ / 4.484V max), per Table 2 and Table 4 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V; enables >10-year battery life in coin-cell-powered devices |
| Reset Threshold Voltage | 4.266V (min), 4.375V (typ), 4.484V (max); factory-trimmed for ±2.5% accuracy across -40°C to +85°C |
| Reset Timeout Period | 40ms minimum (D2 option); ensures µP completes power stabilization before release |
| Watchdog Timeout | 3.3s typical (S-suffix); detects firmware hangs without requiring software polling overhead |
| VCC Validity Range | Reset asserted valid down to VCC = +1.1V; guarantees deterministic behavior during deep brownout |
| MR Input Pulse Width | 1µs minimum; supports fast, low-energy manual reset initiation via momentary switch |
| WDI Pulse Detection | 150ns minimum pulse width; immune to noise while capturing genuine firmware activity edges |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, RoHS-compliant, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output referenced to VCC; drives high during reset assertion; no external pullup required |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 4 | WDI | Watchdog input; rising/falling edge clears internal timer; static state >3.3s triggers reset |
| 5 | VCC | Supply voltage input (1.2V–5.5V); monitored for reset generation; bypass with 0.1µF to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables multi-year operation on CR2032 coin cells |
| Guaranteed reset at low VCC | Valid reset assertion down to VCC = +1.1V prevents undefined µP states during brownout |
| No external components | Integrated MR pullup, precision voltage reference, and timeout generator eliminate BOM cost and layout area |
| Transient immunity | Immune to VCC glitches ≤40µs duration at 100mV overdrive, reducing false resets in noisy environments |
| Edge-triggered watchdog | Detects both rising and falling WDI transitions; eliminates need for software toggling direction management |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Portable handheld glucose meters powered by single CR2032 battery with intermittent usage over 2+ years. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to ARM Cortex-M0 host MCU during power-up, brownout, or firmware hang. Use Value: 170nA quiescent current extends battery life; 4.266V reset threshold matches LiMnO₂ battery discharge curve; 3.3s watchdog catches missed ADC interrupt service. |
Use Scenario: Wearable ECG patch with Bluetooth LE transmission, operating from rechargeable Li-ion cell with tight power budget. IC Role / Device Role / Timing Role: System-level reset supervisor monitoring main 3.3V rail and triggering recovery when BLE stack locks or sensor FIFO overflows. Use Value: Guaranteed reset down to VCC = 1.1V ensures safe shutdown before data corruption; MR input allows clinical staff-initiated recalibration reset. |
| MP3 Players | Industrial Handheld Terminals |
Use Scenario: Flash-based audio player using NAND storage, subject to voltage droop during SD card writes. IC Role / Device Role / Timing Role: Voltage monitor and watchdog co-supervisor ensuring clean reset after write-induced brownout or firmware crash. Use Value: 40ms reset timeout exceeds NAND controller power-up sequence; open-drain compatibility not needed due to push-pull RESET simplifying PCB routing. |
Use Scenario: Ruggedized barcode scanner with cold-temperature operation (-20°C) and frequent drop-induced MCU resets. IC Role / Device Role / Timing Role: Primary reset source coordinating with PMIC, asserting RESET until 3.3V rail stabilizes post-power-cycle. Use Value: Immunity to 40µs VCC transients prevents false resets from mechanical shock-induced supply bounce; MR pin enables field-service hard reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK44D2S+T | Active-low push-pull RESET output; identical VTH, tRP, tWD, and pinout except RESET polarity | Requires inverted logic interface on µP reset input; unsuitable where host expects active-high assertion | Select only if host MCU reset pin is active-low and board layout cannot accommodate level-shifting |
| TPS3837K33DBVR | Fixed 3.3V reset threshold; 200ms min reset timeout; no watchdog timer; 1.6µA ICC (typ) | Lacks watchdog functionality; higher supply current reduces battery lifetime; suitable only for simple power-monitoring use cases | Choose when watchdog is unnecessary and system operates exclusively at 3.3V with ample power margin |
Compared with MAX6865UK44D2S+T, the MAX6864UK44D2S+T offers identical supervision timing but requires host logic inversion, while the TPS3837K33DBVR trades watchdog capability and nanopower operation for lower cost and simpler qualification in non-battery-critical 3.3V systems.
Availability
MAX6865UK44D2S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for MAX6865UK44D2S+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 MAX6864–MAX6869 product line delivers nanopower supervisory circuits with integrated watchdog timers and factory-trimmed thresholds, targeting ultra-low-power portable and implantable medical electronics where battery longevity and fail-safe reliability are critical.
FAQ
What is the exact reset threshold voltage of the MAX6865UK44D2S+T?
The MAX6865UK44D2S+T has a factory-trimmed reset threshold of 4.266V (minimum), 4.375V (typical), and 4.484V (maximum) at TA = +25°C, with ±2.5% tolerance over temperature. This corresponds to the "44" suffix in the part number per Table 2 of the datasheet, and is guaranteed across the full -40°C to +85°C operating range.
Does the MAX6865UK44D2S+T require external components for basic operation?
No, the MAX6865UK44D2S+T requires no external components for core supervision functionality. Its MR input features an internal 10kΩ pullup, the watchdog timer and reset timeout are fully integrated, and the push-pull active-high RESET output needs no external pullup. A 0.1µF bypass capacitor on VCC is recommended for noise immunity but is not strictly required for functional operation.
How does the watchdog timer in the MAX6865UK44D2S+T respond to firmware activity?
The MAX6865UK44D2S+T watchdog timer clears on any detected edge (rising or falling) at the WDI pin and expires only if WDI remains static for longer than 3.3s (typical). Unlike edge-counting watchdogs, it does not require alternating high/low pulses - a single toggle suffices. This behavior is confirmed in the "Watchdog Input" section and Figure 3 of the datasheet.
Can the MAX6865UK44D2S+T operate reliably below 1.8V supply voltage?
Yes, the MAX6865UK44D2S+T is fully specified from VCC = 1.2V to 5.5V and guarantees valid reset assertion down to VCC = +1.1V. At 1.2V, supply current remains ultra-low (190nA typ), and reset timing parameters including tRP and tMRD remain within specification - enabling robust operation in deeply scaled battery-powered systems.
What is the function of Pin 1 on the MAX6865UK44D2S+T?
Pin 1 of the MAX6865UK44D2S+T is the RESET output terminal, configured as an active-high push-pull driver. During reset assertion (due to VCC drop, MR activation, or watchdog timeout), it drives high to VCC; upon deassertion, it drives low. This eliminates the need for an external pullup resistor and provides strong drive capability into µP reset inputs.
MAX6865UK44D2S+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:
- 4.375V
- 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
MAX6865UK44D2S+T FAQ
1.How can I place an order for MAX6865UK44D2S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK44D2S+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 MAX6865UK44D2S+T reliable?
The price and inventory of MAX6865UK44D2S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK44D2S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK44D2S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK44D2S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK44D2S+T?
MAX6865UK44D2S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK44D2S+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 MAX6865UK44D2S+T?
For technical support, including MAX6865UK44D2S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK44D2S+T requirements.
6.How does Aetrix verify that MAX6865UK44D2S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK44D2S+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 MAX6865UK44D2S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK44D2S+T?
All MAX6865UK44D2S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK44D2S+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 MAX6865UK44D2S+T part is unused and in its original packaging.
Return procedure for MAX6865UK44D2S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6865UK44D2S+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
