My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6865UK34D2S+T
- Part No.:
- MAX6865UK34D2S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK34D2S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,307
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6865UK34D2S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (3.315V factory-trimmed reset threshold), manual reset input (MR), and watchdog timer (209s typical timeout) with ultra-low 170nA typical supply current. It asserts an active-low push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, maintaining reset for 40ms minimum after recovery - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK34D2S+T datasheet, MAX6865UK34D2S+T pinout, MAX6865UK34D2S+T application, or MAX6865UK34D2S+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), fixed 40ms reset timeout, and SOT23-5 footprint compatibility with TPS383x series.
Technical Context
This device implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C, coupled with a digital watchdog timer that clears on any WDI edge (rising or falling) and expires if WDI remains static beyond 209s (typ). The internal 10kΩ MR pullup enables direct switch-to-GND implementation without external components.
The push-pull active-low RESET output delivers VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.12V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA, ensuring robust logic-level compatibility across 1.2V–5.5V supply ranges while maintaining guaranteed operation down to VCC = 1.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.315V (min 3.218V, max 3.485V) - factory-trimmed for precise 3.3V system brownout detection |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in always-on medical sensors |
| Reset Timeout Period | 40ms (min) - ensures µP initialization completes before release, per D2 option in Table 4 |
| Watchdog Timeout | 209s (typ), L-suffix - long-duration supervision for infrequently updated firmware in patient monitors |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V systems without level-shifting |
| RESET Output Type | Push-pull active-low - eliminates need for external pullup resistor, reduces BOM count |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains deterministic reset state during deep brownout conditions |
Pinout & Package
Package: 5-pin SOT23-5 (2.9mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives µP reset pin directly; sinks up to 1.2mA at VCC ≥ 2.12V |
| 2 | GND | Ground reference - must connect to system ground plane with low-impedance path |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); accepts CMOS logic or momentary switch to GND |
| 4 | WDI | Watchdog input - edge-sensitive (150ns min pulse width); clears internal timer on rising/falling transitions |
| 5 | VCC | Supply voltage input - monitored for brownout; requires 0.1µF ceramic bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in portable medical devices beyond 5 years |
| Factory-trimmed reset threshold | 3.315V ±2.5% - eliminates external resistor divider, reduces calibration overhead |
| Watchdog timer with long timeout | 209s typical (L-suffix) - suitable for firmware with infrequent background tasks or sleep cycles |
| Immunity to VCC transients | No reset for ≤40µs transients at 100mV overdrive - prevents spurious resets in noisy power environments |
| No external components required | Integrated MR pullup (10kΩ), no timing capacitors - reduces PCB area and assembly cost |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission every 5 minutes. IC Role / Device Role / Timing Role: Supervises 3.3V rail and detects MCU lockup via WDI toggling; asserts RESET if BLE stack hangs. Use Value: Prevents undetected sensor data loss by forcing MCU reboot within 209s of software freeze. |
Use Scenario: Multi-parameter bedside monitor with ECG, SpO₂, and NIBP modules operating on rechargeable Li-ion. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and triggers hardware reset if VCC drops below 3.218V during battery transition. Use Value: Ensures deterministic startup sequence and avoids corrupted waveform buffers during brownout recovery. |
| Portable ECG Devices | Wearable Health Trackers |
Use Scenario: Single-lead ECG patch with 7-day battery life and firmware-over-the-air updates. IC Role / Device Role / Timing Role: Provides 40ms reset pulse after power-up and watches WDI during OTA verification phase. Use Value: Guarantees clean state entry post-update and prevents boot-loop due to corrupted flash sectors. |
Use Scenario: Fitness tracker with motion-sensing SoC running on coin-cell battery. IC Role / Device Role / Timing Role: Supervises 1.8V core rail and uses MR for user-initiated factory reset via button press. Use Value: Enables reliable field recovery without requiring PC connection or JTAG interface. |
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 reset threshold, 200ms timeout, no watchdog, SOT23-5 | Lacks watchdog supervision; suited only for basic voltage monitoring | Select when long watchdog timeout is unnecessary and cost sensitivity outweighs feature set |
| MAX6369KA29+T | 2.93V threshold, 140ms timeout, 1.6s watchdog, same 5-pin SOT23 | Shorter watchdog period limits suitability for infrequent-firmware-update systems | Prefer for applications requiring faster fault detection but accepting higher ICC (1.5µA) |
Compared with MAX6865UK34D2S+T, TPS3836K33DBVR omits watchdog functionality entirely, while MAX6369KA29+T offers faster watchdog response but consumes ~9× more quiescent current - making MAX6865UK34D2S+T optimal for ultra-low-power, long-interval supervision in medical wearables.
Availability
MAX6865UK34D2S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered patient monitors, and wearable health trackers requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6865UK34D2S+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 industrial, medical, and communications applications, with expertise in low-power supervision and reliability-critical systems.
The MAX68xx family targets ultra-low-power microprocessor supervision in space-constrained, battery-operated equipment - emphasizing nanopower operation, guaranteed reset validity at low VCC, and integrated watchdog timers for safety-critical firmware monitoring.
FAQ
What is the exact reset threshold voltage of the MAX6865UK34D2S+T?
The MAX6865UK34D2S+T has a factory-trimmed reset threshold of 3.315V, with guaranteed tolerance of ±2.5% (3.218V to 3.485V) over -40°C to +85°C. This value corresponds to the "34" suffix in the part number per Maxim's Threshold Suffix Guide (Table 2), confirming it is optimized for 3.3V nominal supply supervision.
Does the MAX6865UK34D2S+T require external components for basic operation?
No, the MAX6865UK34D2S+T operates autonomously with no external components required: MR is internally pulled up to VCC (10kΩ), RESET is push-pull active-low, and VCC bypassing uses only a standard 0.1µF ceramic capacitor. No timing resistors, capacitors, or pullups are needed for voltage monitoring, manual reset, or watchdog functions.
What is the watchdog timeout behavior of the MAX6865UK34D2S+T?
The MAX6865UK34D2S+T features a watchdog timer with 209s typical timeout (L-suffix), clearing on any WDI edge (rising or falling) and asserting RESET if WDI remains static beyond this period. The timer halts during RESET assertion and resumes counting immediately upon deassertion - enabling precise supervision of firmware execution loops.
Can the MAX6865UK34D2S+T operate reliably at low supply voltages?
Yes, the MAX6865UK34D2S+T guarantees valid RESET output down to VCC = +1.1V, with supply voltage range specified from 1.2V to 5.5V. Its 170nA typical ICC at 1.8V and robust VOL/VOH performance ensure deterministic reset signaling even during deep brownout conditions common in battery-depleted medical devices.
How is the 40ms reset timeout period implemented in the MAX6865UK34D2S+T?
The MAX6865UK34D2S+T implements a fixed 40ms minimum reset timeout period (D2 option per Table 4), generated by an internal RC oscillator independent of external components. This timeout begins when VCC rises above the reset threshold or MR deasserts, and holds RESET asserted for ≥40ms before deassertion - ensuring sufficient time for µP power stabilization and internal register initialization.
MAX6865UK34D2S+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:
- 3.4V
- 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
MAX6865UK34D2S+T FAQ
1.How can I place an order for MAX6865UK34D2S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK34D2S+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 MAX6865UK34D2S+T reliable?
The price and inventory of MAX6865UK34D2S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK34D2S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK34D2S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK34D2S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK34D2S+T?
MAX6865UK34D2S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK34D2S+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 MAX6865UK34D2S+T?
For technical support, including MAX6865UK34D2S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK34D2S+T requirements.
6.How does Aetrix verify that MAX6865UK34D2S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK34D2S+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 MAX6865UK34D2S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK34D2S+T?
All MAX6865UK34D2S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK34D2S+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 MAX6865UK34D2S+T part is unused and in its original packaging.
Return procedure for MAX6865UK34D2S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6865UK34D2S+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…
