My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6865UK32D2L+T
- Part No.:
- MAX6865UK32D2L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK32D2L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,979
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6865UK32D2L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.2V reset threshold (±2.5%), 40ms minimum reset timeout, and integrated watchdog timer with 209s typical timeout. It asserts active-low push-pull RESET during VCC brownout, manual reset, or watchdog expiration - used in battery-powered medical monitors and portable instrumentation.
For engineers reviewing the MAX6865UK32D2L+T datasheet, MAX6865UK32D2L+T pinout, MAX6865UK32D2L+T application, or MAX6865UK32D2L+T equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, MR input with 10kΩ internal pullup, and compatibility with noisy low-power systems requiring deterministic reset behavior under voltage sag or software lockup.
Technical Context
This device integrates three core functions: precision voltage monitoring with hysteresis (0.5% of VTH), a manual reset input (MR) with 250ns propagation delay and 1µs minimum pulse width, and a watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 209s (typ). The reset output remains asserted for the full 40ms timeout after VCC recovery, MR deassertion, or watchdog expiration.
Its BiCMOS process enables stable operation across -40°C to +85°C with supply voltage range 1.2V–5.5V, while the open-drain/push-pull output options support direct interfacing to diverse µP reset inputs. No external components are required - bypassing VCC with a 0.1µF capacitor suffices for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V - enables multi-year operation on coin-cell batteries in always-on monitoring devices. |
| Reset Threshold | 3.200V ±2.5% - factory-trimmed to monitor 3.3V rails with precise brownout detection without calibration. |
| Reset Timeout | 40ms min - ensures µP completes power-up initialization before release from reset state. |
| Watchdog Timeout | 209s typ (L-suffix) - provides long-duration supervision for infrequently updated firmware or low-duty-cycle sensors. |
| VCC Validity Range | Reset valid down to VCC = +1.1V - guarantees reliable assertion even during deep brownout conditions. |
| MR Input Behavior | Internally pulled up to VCC via 10kΩ - supports direct switch-to-GND connection without external biasing. |
| WDI Pulse Detection | 150ns minimum pulse width - tolerates fast software toggles and avoids false watchdog clears from noise. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin supervisory ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives µP reset pin directly; no external pullup needed; sinks 1.2mA at VCC ≥ 2.38V. |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return for all internal circuits. |
| 3 | MR | Active-low manual reset input - initiates reset when pulled low; internally pulled up to VCC (10kΩ); accepts CMOS logic levels. |
| 4 | WDI | Watchdog input - rising/falling edges clear internal timer; static high/low >209s triggers reset; 20nA max input current. |
| 5 | VCC | Supply voltage input - monitored for brownout; operates from 1.2V to 5.5V; requires 0.1µF ceramic bypass to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors powered by CR2032 cells. |
| Reset threshold accuracy | ±2.5% over temperature ensures consistent 3.2V trip point across -40°C to +85°C without trimming. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in electrically noisy handheld devices. |
| No external components | Self-contained supervision - eliminates BOM cost and PCB area for RC timing networks or pullup resistors. |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V - critical for fail-safe behavior in low-voltage brownout scenarios. |
Applications
| Portable Medical Monitoring | Battery-Powered IoT Sensors |
|---|---|
|
Use Scenario: Continuous glucose monitoring patch with 2-week battery life and firmware safety-critical reset on brownout or hang. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET to ARM Cortex-M0+ during VCC sag below 3.2V or WDI timeout. Use Value: Prevents corrupted sensor data logging by ensuring µP restarts cleanly after power interruption or software lockup. |
Use Scenario: LoRaWAN soil moisture node operating on AA batteries in remote agricultural fields. IC Role / Device Role / Timing Role: Watchdog supervisor detecting firmware stalls during RF transmission or sensor read cycles. Use Value: 209s watchdog timeout matches typical sleep-wake interval, enabling autonomous recovery without gateway intervention. |
| Industrial Handheld Terminals | Low-Power Wearables |
|
Use Scenario: Rugged barcode scanner subjected to ESD events and battery voltage sag during motor activation. IC Role / Device Role / Timing Role: Voltage monitor and MR interface providing hardware reset independent of µP firmware state. Use Value: 40ms reset timeout exceeds µP power-up sequencing requirements; MR supports field-service hard reset via button. |
Use Scenario: Fitness tracker with heart-rate sensor, BLE radio, and rechargeable Li-ion cell. IC Role / Device Role / Timing Role: Nanopower supervisor enabling <1µA system standby current while maintaining reset integrity. Use Value: 170nA ICC contributes <0.5% to total standby load - extends charge cycle by ~8 hours per week. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | 3.08V fixed threshold, 200ms timeout, no watchdog, 1.6µA ICC - higher quiescent current, no WDI functionality. | Suitable only for basic reset-only applications without software supervision needs. | Select when watchdog is unnecessary and cost is prioritized over ultra-low power. |
| MAX6361KA29D3+T | 2.93V threshold, 100ms timeout, no watchdog, 1.2µA ICC - lacks WDI but offers tighter 1.5% VTH tolerance. | Applicable where precise 2.93V brownout detection is required and software supervision is handled externally. | Choose for higher accuracy threshold where watchdog capability is redundant. |
Compared with TPS3836K33DBVR and MAX6361KA29D3+T, the MAX6865UK32D2L+T uniquely delivers nanopower operation (170nA vs >1µA), integrated 209s watchdog, and 3.2V threshold matching common 3.3V LDO outputs - making it optimal for long-life, safety-critical embedded systems requiring both voltage and software supervision.
Availability
MAX6865UK32D2L+T is available at Aetrix Electronics and suitable for portable medical monitoring, battery-powered IoT sensors, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6865UK32D2L+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, sensing, and interface applications in industrial, medical, and communications markets.
The MAX68xx family targets ultra-low-power microprocessor supervision in space-constrained, battery-operated systems - emphasizing nanoscale current consumption, guaranteed reset behavior across voltage and temperature, and integrated watchdog functionality.
FAQ
What is the exact reset threshold voltage of the MAX6865UK32D2L+T?
The MAX6865UK32D2L+T has a factory-trimmed reset threshold of 3.200V with ±2.5% tolerance over temperature (-40°C to +85°C), corresponding to the "32" suffix in the part number per Maxim's Threshold Suffix Guide. This value is verified in the Electrical Characteristics table and ensures accurate supervision of 3.3V supply rails without external calibration.
Does the MAX6865UK32D2L+T require external components for basic operation?
No, the MAX6865UK32D2L+T requires no external components for core functionality. A 0.1µF ceramic capacitor from VCC to GND is recommended for noise immunity, but no pullup resistors, timing capacitors, or voltage dividers are needed - the MR input has an internal 10kΩ pullup, and the RESET output is push-pull active-low.
What is the watchdog timeout behavior of the MAX6865UK32D2L+T?
The MAX6865UK32D2L+T features a watchdog timer with 209s typical timeout (L-suffix), which expires if the WDI input remains static (high or low) beyond that period. Each rising or falling edge on WDI clears the timer; reset is asserted for the full 40ms timeout upon expiration. The timer is disabled during active RESET assertion.
Can the MAX6865UK32D2L+T operate reliably at VCC = 1.5V?
Yes, the MAX6865UK32D2L+T is fully specified from VCC = 1.2V to 5.5V and guarantees RESET validity down to VCC = +1.1V. At 1.5V, all functions - including voltage monitoring, MR response, and WDI edge detection - operate within datasheet limits, with supply current dropping to ~190nA (typ).
How does the MAX6865UK32D2L+T handle short VCC transients?
The MAX6865UK32D2L+T is immune to VCC transients ≤40µs in duration when the overdrive is 100mV (i.e., VCC dips 100mV below the 3.2V threshold). This transient immunity prevents false resets in electrically noisy environments such as motor-driven handheld tools or ESD-prone medical devices - confirmed by the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph.
MAX6865UK32D2L+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:
- 3.2V
- 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
MAX6865UK32D2L+T FAQ
1.How can I place an order for MAX6865UK32D2L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK32D2L+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 MAX6865UK32D2L+T reliable?
The price and inventory of MAX6865UK32D2L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK32D2L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK32D2L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK32D2L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK32D2L+T?
MAX6865UK32D2L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK32D2L+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 MAX6865UK32D2L+T?
For technical support, including MAX6865UK32D2L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK32D2L+T requirements.
6.How does Aetrix verify that MAX6865UK32D2L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK32D2L+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 MAX6865UK32D2L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK32D2L+T?
All MAX6865UK32D2L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK32D2L+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 MAX6865UK32D2L+T part is unused and in its original packaging.
Return procedure for MAX6865UK32D2L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6865UK32D2L+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…
