My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6865UK29D3S+T
- Part No.:
- MAX6865UK29D3S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK29D3S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,991
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6865UK29D3S+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 2.925V reset threshold, 150ms minimum reset timeout (D3), and integrated watchdog timer with 3.3s typical timeout (S suffix). It monitors VCC, responds to manual reset (MR), and asserts active-high push-pull RESET during brownout, power-up, or watchdog expiration - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK29D3S+T datasheet, MAX6865UK29D3S+T pinout, MAX6865UK29D3S+T application, or MAX6865UK29D3S+T equivalent, key selection criteria include its 2.925V threshold accuracy, 150ms reset hold time, 3.3s watchdog period, guaranteed RESET validity down to VCC = +1.1V, and immunity to sub-40µs VCC transients - critical for low-voltage, long-battery-life embedded systems.
Technical Context
This device implements a precision bandgap-based voltage monitor with 2.5% threshold tolerance and 0.5% hysteresis, combined with a digital watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 3.3s (typ). Its internal 10kΩ MR pullup and glitch rejection (200ns) enable robust manual reset without external components.
The active-high push-pull RESET output delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V) and VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V), ensuring reliable µP interface across 1.2V–5.5V supply range while maintaining valid reset assertion down to VCC = +1.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA (typ) at VCC = 1.8V - enables >10-year battery life in coin-cell-powered devices |
| Reset Threshold | 2.925V (min 2.852V / max 2.998V) - precisely matches 3.0V system rails with ±2.5% tolerance |
| Reset Timeout | 150ms (min) - holds µP in reset long enough for full power stabilization after brownout recovery |
| Watchdog Timeout | 3.3s (typ) - balances fault detection speed against false triggers in intermittently active firmware |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, 2-cell alkaline, and 3.3V/5V logic domains |
| RESET Validity | Guaranteed to VCC = +1.1V - ensures deterministic reset behavior during deep brownout |
| MR Glitch Rejection | 200ns - suppresses noise-induced spurious resets in electrically noisy environments |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, -40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset input directly without pullup; sinks 1.2mA / sources 500µA |
| 2 | GND | Ground reference - must connect to system ground plane for stable threshold and noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS levels; 1µs min pulse width |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on each transition; rejects <150ns pulses |
| 5 | VCC | Supply and monitored voltage - requires 0.1µF bypass capacitor to GND; reset asserted if VCC < 2.925V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - reduces quiescent power by >90% vs. standard supervisors, extending battery life |
| Factory-trimmed VTH | 2.925V threshold with ±2.5% tolerance - eliminates external resistor networks and calibration overhead |
| Integrated watchdog | 3.3s typical timeout with edge-triggered clear - detects firmware hangs without requiring dedicated timer peripherals |
| No external components | Self-contained supervision - no capacitors, resistors, or diodes needed for basic reset/watchdog functionality |
| VCC transient immunity | Immune to 40µs VCC glitches at 100mV overdrive - prevents false resets in noisy automotive or industrial power rails |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 7–14 days on single CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 2.8V analog front-end and BLE SoC; asserts RESET on battery sag below 2.925V and on firmware lockup via WDI. Use Value: 170nA ICC extends usable battery life by >30% versus 1µA alternatives; 150ms D3 timeout ensures ADC reference stabilizes before µP boot. |
Use Scenario: Portable ECG/SpO₂ monitor powered by two AA alkaline cells (2.0–3.2V range). IC Role / Device Role / Timing Role: Monitors main 3.0V rail; triggers reset on voltage dip during RF transmission burst; uses MR for clinician-initiated recalibration. Use Value: 2.925V threshold aligns with end-of-life cutoff for alkaline cells; 3.3s watchdog prevents missed arrhythmia alerts due to frozen firmware. |
| Industrial Handheld Scanners | Smart Wearable Sensors |
|
Use Scenario: Rugged barcode scanner operating in warehouses with 12–24V DC-DC converted to 3.3V. IC Role / Device Role / Timing Role: Detects input ripple-induced brownouts on 3.3V rail; provides manual reset via button tied to MR; WDI fed by MCU GPIO toggled per scan cycle. Use Value: 200ns MR glitch rejection prevents false resets from motor commutation noise; 1.1V RESET validity covers worst-case DC-DC dropout. |
Use Scenario: Fitness tracker with Bluetooth LE SoC and optical heart-rate sensor, powered by 3.7V Li-Po. IC Role / Device Role / Timing Role: Supervises 3.0V LDO output; asserts RESET if battery drops below 2.925V or if motion-detection firmware freezes (WDI timeout). Use Value: Push-pull active-high RESET directly interfaces with SoC's active-high reset pin; eliminates need for level-shifting or pullup resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK29D3S+T | Same 2.925V threshold, 150ms timeout, 3.3s watchdog, but active-low push-pull RESET output | Requires µP with active-low reset input; incompatible with active-high-only reset pins | Select when interfacing with legacy µPs requiring active-low reset assertion |
| TPS3836K33DBVR | 2.93V threshold, 200ms timeout, no watchdog; 1.6µA ICC - 10× higher quiescent current than MAX6865UK29D3S+T | Suitable only for non-battery-critical applications; lacks WDI fault detection capability | Choose only if watchdog functionality is unnecessary and cost is prioritized over battery life |
Compared with MAX6864UK29D3S+T, the MAX6865UK29D3S+T offers direct compatibility with active-high reset inputs, eliminating level-shifting. Against TPS3836K33DBVR, it delivers 10× lower ICC and integrated watchdog - essential for multi-year wearable deployments where firmware reliability and energy efficiency are non-negotiable.
Availability
MAX6865UK29D3S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered industrial scanners, smart wearables, and glucose monitoring systems requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK29D3S+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 MAX6854–MAX6869 family targets ultra-low-power microprocessor supervision in space- and energy-constrained portable electronics, emphasizing nanopower operation, factory-trimmed accuracy, and integrated watchdog safety.
FAQ
What is the exact reset threshold voltage of the MAX6865UK29D3S+T?
The MAX6865UK29D3S+T has a factory-trimmed reset threshold of 2.925V, with guaranteed minimum and maximum values of 2.852V and 2.998V respectively (±2.5% tolerance). This value is fixed and unadjustable, optimized for 3.0V nominal supply rails in portable medical and wearable applications.
Does the MAX6865UK29D3S+T require external components to operate?
No, the MAX6865UK29D3S+T operates autonomously with no external components required for core supervision. A 0.1µF bypass capacitor on VCC is recommended for noise immunity, but no resistors, timing capacitors, or pullups are needed - the MR input includes a 10kΩ internal pullup, and RESET is push-pull active-high.
How does the watchdog timer in the MAX6865UK29D3S+T function?
The MAX6865UK29D3S+T watchdog timer expires after 3.3s (typical) if the WDI input remains static (no rising or falling edge). Each edge on WDI clears the timer. During reset assertion, the watchdog is disabled; it resumes counting only after RESET deasserts - preventing false timeouts during boot sequences.
What is the minimum supply voltage at which MAX6865UK29D3S+T guarantees valid RESET output?
The MAX6865UK29D3S+T guarantees valid RESET output down to VCC = +1.1V. Below this voltage, RESET behavior is not specified. This ensures deterministic reset assertion during deep brownout conditions common in battery-powered systems nearing end-of-life.
Can the MAX6865UK29D3S+T be used with a microcontroller that has an active-low reset input?
No - the MAX6865UK29D3S+T provides only an active-high push-pull RESET output. For active-low reset inputs, use the pin-compatible MAX6864UK29D3S+T (active-low push-pull) or MAX6866UK29D3S+T (active-low open-drain), both sharing identical threshold, timeout, and watchdog specifications.
MAX6865UK29D3S+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:
- 2.925V
- 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
MAX6865UK29D3S+T FAQ
1.How can I place an order for MAX6865UK29D3S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK29D3S+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 MAX6865UK29D3S+T reliable?
The price and inventory of MAX6865UK29D3S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK29D3S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK29D3S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK29D3S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK29D3S+T?
MAX6865UK29D3S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK29D3S+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 MAX6865UK29D3S+T?
For technical support, including MAX6865UK29D3S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK29D3S+T requirements.
6.How does Aetrix verify that MAX6865UK29D3S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK29D3S+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 MAX6865UK29D3S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK29D3S+T?
All MAX6865UK29D3S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK29D3S+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 MAX6865UK29D3S+T part is unused and in its original packaging.
Return procedure for MAX6865UK29D3S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6865UK29D3S+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…
