My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6865UK26D1S+T
- Part No.:
- MAX6865UK26D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK26D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,013
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6865UK26D1S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (2.625V reset threshold), manual reset input, and watchdog timer (3.3s typical timeout). It asserts an active-high push-pull RESET signal during VCC brownout, MR assertion, or watchdog timeout, with guaranteed reset validity down to VCC = +1.1V. It targets ultra-low-power portable medical and consumer devices requiring reliable power-on reset and firmware crash recovery.
For engineers reviewing the MAX6865UK26D1S+T datasheet, MAX6865UK26D1S+T pinout, MAX6865UK26D1S+T application, or MAX6865UK26D1S+T equivalent, key selection criteria include its 170nA typical supply current, factory-trimmed 2.625V reset threshold, 10ms minimum reset timeout, 3.3s watchdog period, and active-high push-pull output - all validated for -40°C to +85°C operation in battery-powered systems.
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). The internal reset timeout generator uses a temperature-stable RC oscillator calibrated to deliver 10ms (min) after VCC recovery or MR release.
The MAX6865UK26D1S+T features an internally pulled-up MR input (10kΩ to VCC), glitch-immune detection (200ns rejection), and a push-pull RESET output referenced to VCC with VOH ≥ 0.8×VCC at 500µA source current. Its architecture ensures no external components are required for basic supervision functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in always-on medical monitors. |
| Reset Threshold | 2.625V (factory-trimmed, ±2.5%) - matches common 2.6V/2.7V logic rails and LDO outputs. |
| Reset Timeout | 10ms (min), D1 option - ensures µP initialization completes before peripheral access begins. |
| Watchdog Timeout | 3.3s (typ), S-suffix - provides sufficient margin for complex boot sequences without false triggers. |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and interfaces directly to µP reset pins. |
| Operating Range | -40°C to +85°C - qualified for industrial and portable medical environments. |
| VCC Validity | RESET valid down to VCC = +1.1V - guarantees clean reset assertion during deep brownout conditions. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm height, optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin directly; sinks 1.2mA at VCC ≥ 2.38V. |
| 2 | GND | Ground reference - must connect to system ground plane for noise immunity and accurate threshold sensing. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); accepts CMOS logic or open-drain signals. |
| 4 | WDI | Watchdog input - edge-sensitive; clears internal timer on rising/falling transitions; rejects pulses <150ns. |
| 5 | VCC | Supply voltage input - monitored for brownout; bypass with 0.1µF ceramic capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in glucose monitors and wearable sensors. |
| Guaranteed VCC reset validity | RESET functional down to VCC = +1.1V - prevents undefined µP state during deep undervoltage events. |
| Immunity to short VCC transients | No reset triggered by ≤40µs transients at 100mV overdrive - improves reliability in noisy power environments. |
| No external components | Self-contained supervision - eliminates BOM cost and layout area for RC timing networks or pullups. |
| Watchdog edge-clearing logic | Timer resets on any WDI transition - supports flexible software heartbeat patterns without strict high/low symmetry. |
Applications
| Portable Medical Devices | Wearable Health Monitors |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 10+ days on single coin cell. IC Role / Device Role / Timing Role: Supervises 2.6V regulated rail, asserts RESET on battery sag below 2.625V, and triggers watchdog reset if firmware hangs during sensor calibration. Use Value: Prevents data corruption and missed alarms by ensuring deterministic µP restart within 10ms of fault detection. |
Use Scenario: ECG patch with Bluetooth LE transmission, operating intermittently to conserve energy. IC Role / Device Role / Timing Role: Provides power-on reset and monitors µP activity via WDI; 3.3s watchdog timeout aligns with maximum BLE connection interval. Use Value: Guarantees recovery from RF stack lockups without user intervention, maintaining clinical-grade uptime. |
| Low-Power IoT Sensors | Industrial Handheld Terminals |
|
Use Scenario: Battery-powered environmental sensor node transmitting temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Monitors 3.3V supply from buck converter; uses MR for factory test mode entry and WDI for firmware sanity check. Use Value: 170nA quiescent current contributes <0.1% to total sleep-mode load, preserving 5-year battery life. |
Use Scenario: Ruggedized barcode scanner used in warehouse logistics with frequent drop-induced firmware crashes. IC Role / Device Role / Timing Role: Detects VCC dips during mechanical shock and initiates watchdog reset if application fails to toggle WDI within 3.3s. Use Value: Eliminates need for field technician reboot; restores scanning function autonomously within 10ms of fault. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK26D1S+T | Active-low push-pull RESET output; identical threshold, timeout, and watchdog specs. | Requires µP with active-low reset input; incompatible with active-high reset designs without level-shifting. | Select when interfacing to legacy µPs expecting active-low reset assertion. |
| TPS3836K33DBVR | Fixed 3.3V reset threshold; 200ms min timeout; no watchdog; 3.5µA ICC - 20× higher supply current. | Suitable only for non-watchdog applications with 3.3V rails; cannot replace MAX6865UK26D1S+T where 2.625V threshold or 3.3s watchdog is required. | Choose only for cost-sensitive, non-watchdog designs where 3.3V supervision suffices and 170nA is not critical. |
Compared with MAX6864UK26D1S+T and TPS3836K33DBVR, the MAX6865UK26D1S+T uniquely delivers active-high reset, 2.625V threshold, and integrated 3.3s watchdog in a 170nA package - making it the sole fit for space- and power-constrained medical wearables requiring precise low-voltage supervision and autonomous crash recovery.
Availability
MAX6865UK26D1S+T is available at Aetrix Electronics and suitable for portable medical devices, wearable health monitors, and low-power IoT sensors requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK26D1S+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 nanopower microprocessor supervision in battery-critical systems, integrating voltage monitoring, manual reset, and watchdog functions into minimal 5-pin SOT23 packages.
FAQ
What is the exact reset threshold voltage of the MAX6865UK26D1S+T?
The MAX6865UK26D1S+T has a factory-trimmed reset threshold of 2.625V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "26" corresponds to 2.625V nominal. The device guarantees reset assertion when VCC falls below this threshold and deassertion only after VCC exceeds it by ≥150mV plus timeout delay.
Does the MAX6865UK26D1S+T require external components for basic operation?
No, the MAX6865UK26D1S+T operates fully self-contained with no external components required. Its internal 10kΩ MR pullup, precision voltage reference, and RC-based timeout generator eliminate the need for external resistors, capacitors, or pullups. A 0.1µF ceramic bypass capacitor on VCC is recommended but not strictly required for functional operation in low-noise environments.
What is the watchdog timeout behavior of the MAX6865UK26D1S+T?
The MAX6865UK26D1S+T features a watchdog timer with a typical timeout of 3.3s (S-suffix), with min/max values of 1.5s and 7.75s. The timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static (high or low) beyond the timeout period. Upon expiration, it asserts the active-high RESET signal for the configured 10ms minimum timeout period.
How does the MAX6865UK26D1S+T ensure reset validity at low VCC?
The MAX6865UK26D1S+T guarantees RESET output validity down to VCC = +1.1V, verified across temperature. Its push-pull output maintains VOH ≥ 0.8×VCC at 500µA source current even at 1.1V, ensuring compatible logic levels for modern ultra-low-voltage µPs. This specification prevents metastability during brownout recovery and is explicitly tested per Absolute Maximum Ratings and Electrical Characteristics tables.
Is the MAX6865UK26D1S+T pin-compatible with other devices in the MAX68xx family?
The MAX6865UK26D1S+T shares the same 5-pin SOT23-5 package and pinout (RESET, GND, MR, WDI, VCC) with MAX6864/MAX6866/MAX6867–MAX6869 variants. However, it is not pin-compatible with MAX6854–MAX6863 due to differing pin functions (e.g., CT instead of WDI). Direct substitution requires matching both function (watchdog + active-high RESET) and pin mapping - confirmed in the Pin Configurations and Selector Guide sections.
MAX6865UK26D1S+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:
- 2.625V
- 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
MAX6865UK26D1S+T FAQ
1.How can I place an order for MAX6865UK26D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK26D1S+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 MAX6865UK26D1S+T reliable?
The price and inventory of MAX6865UK26D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK26D1S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK26D1S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK26D1S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK26D1S+T?
MAX6865UK26D1S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK26D1S+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 MAX6865UK26D1S+T?
For technical support, including MAX6865UK26D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK26D1S+T requirements.
6.How does Aetrix verify that MAX6865UK26D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK26D1S+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 MAX6865UK26D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK26D1S+T?
All MAX6865UK26D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK26D1S+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 MAX6865UK26D1S+T part is unused and in its original packaging.
Return procedure for MAX6865UK26D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6865UK26D1S+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…
