My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6865UK45D6S+T
- Part No.:
- MAX6865UK45D6S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK45D6S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,285
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6865UK45D6S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.500V reset threshold (±2.5%), 1200ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout. It monitors VCC in battery-powered medical and portable electronics to ensure reliable µP initialization during brownout or software fault conditions.
For engineers reviewing the MAX6865UK45D6S+T datasheet, MAX6865UK45D6S+T pinout, MAX6865UK45D6S+T application, or MAX6865UK45D6S+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in glucose monitors and patient monitors, and two validated alternative parts with documented functional differences.
Technical Context
The MAX6865UK45D6S+T integrates voltage monitoring, a manual reset input (MR), and a watchdog timer (WDI) in a single BiCMOS IC. Its reset assertion logic triggers on VCC falling below 4.500V, MR low pulse ≥1µs, or WDI inactivity exceeding 209s (typ), with guaranteed reset validity down to VCC = +1.1V.
It features push-pull active-high RESET output referenced to VCC, internal 10kΩ MR pullup, and immunity to VCC transients ≤40µs at 100mV overdrive. The watchdog clears on any WDI edge, MR assertion, or RESET assertion - enabling robust software execution monitoring without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V; enables multi-year battery life in portable medical devices |
| Reset Threshold | 4.500V ±2.5%; factory-trimmed for precise 3.3V/5V rail supervision without external resistors |
| Reset Timeout | 600–1200ms min (D6 option); ensures µP completes power-up sequencing before release |
| Watchdog Timeout | 209s typ (L suffix); supports long-loop firmware in low-duty-cycle embedded systems |
| VCC Operating Range | 1.2V to 5.5V; valid reset assertion guaranteed down to 1.1V for fail-safe behavior near brownout |
| MR Input Logic | Active-low, 0.3×VCC max VIL; compatible with CMOS outputs and momentary switches without debounce |
| WDI Pulse Width | 150ns min; detects fast software toggles even under high clock jitter or 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-high push-pull output; drives µP reset pin directly-no external pullup required |
| 2 | GND | Ground reference for all internal circuits and reset timing; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS-level signals |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on each transition |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in glucose monitors beyond 5 years |
| Guaranteed reset at low VCC | Valid RESET output asserted down to VCC = +1.1V prevents undefined µP state during deep brownout |
| No external components | Factory-trimmed threshold, internal MR pullup, and integrated watchdog eliminate BOM cost and layout area |
| Watchdog glitch immunity | 150ns minimum WDI pulse width rejects EMI-induced false edges in noisy medical environments |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive-avoids spurious resets in switching-power-supply systems |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V MCU supply and asserts RESET if firmware hangs or VCC sags during sensor activation. Use Value: Prevents corrupted glucose readings by forcing controlled reboot before data transmission error occurs. |
Use Scenario: Multi-parameter bedside monitor with ECG, SpO₂, and NIBP modules sharing one ARM Cortex-M4. IC Role / Device Role / Timing Role: Provides 1200ms reset hold time after power-on and watchdog-triggered recovery from communication stack lockups. Use Value: Ensures clinical-grade reliability-no missed alarms due to silent µP freeze during critical measurement windows. |
| Portable Ultrasound Devices | Wearable ECG Patches |
Use Scenario: Battery-powered handheld ultrasound with FPGA-based beamforming and RF front-end. IC Role / Device Role / Timing Role: Monitors 1.8V FPGA core rail and 5V analog supply; asserts RESET on either rail collapse or watchdog timeout. Use Value: Avoids partial initialization where FPGA config loads but analog bias fails-guarantees full-system readiness. |
Use Scenario: 7-day disposable ECG patch with ultra-low-power MCU and BLE radio. IC Role / Device Role / Timing Role: Uses 209s watchdog timeout to detect firmware stalls during extended sleep/wake cycles. Use Value: Enables >99.9% uptime over 168 hours without user intervention or battery replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK45D6S+T | No watchdog timeout selection-fixed 3.3s (S suffix); same 4.500V threshold and D6 timeout | Suitable for systems requiring faster watchdog response, e.g., real-time control loops with <100ms recovery SLA | Select when shorter watchdog period is needed; not drop-in-requires firmware WDI toggle rate adjustment |
| TPS3837K33DBVR | Fixed 3.08V reset threshold, 200ms timeout, no watchdog; push-pull active-low RESET; 1.5µA ICC | Applicable only for basic power-on reset in non-watchdog systems like simple sensor nodes | Choose only if watchdog function is unnecessary and 4.5V threshold is not required-higher ICC increases battery load |
Compared with MAX6865UK45D6S+T, MAX6864UK45D6S+T offers faster watchdog response but lacks long-interval flexibility, while TPS3837K33DBVR omits watchdog entirely and trades nanopower efficiency for simpler architecture-making MAX6865UK45D6S+T optimal for battery-critical medical devices needing both precision threshold and long watchdog coverage.
Availability
MAX6865UK45D6S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and portable ultrasound devices requiring stable component supply across industrial temperature range (-40°C to +85°C) and long-lifecycle support.
Supply support for MAX6865UK45D6S+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 demanding applications in healthcare, industrial, and communications markets.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-constrained medical and portable electronics, prioritizing nanoscale current draw and guaranteed reset behavior at sub-1.2V rails.
FAQ
What is the exact reset threshold voltage of MAX6865UK45D6S+T?
The MAX6865UK45D6S+T has a factory-trimmed reset threshold of +4.500V, with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "45" corresponds to 4.500V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for brownout detection in 3.3V and 5V systems.
Does MAX6865UK45D6S+T support active-high or active-low reset output?
MAX6865UK45D6S+T provides an active-high push-pull RESET output (pin 1), as confirmed in the MAX6865-specific pin description on page 8 of the datasheet. Unlike MAX6864/MAX6866 variants, MAX6865 does not offer open-drain or active-low options-its RESET pin transitions from low to high upon reset assertion and remains high for the full D6 timeout period (600–1200ms).
What is the watchdog timeout period for MAX6865UK45D6S+T, and how is it selected?
MAX6865UK45D6S+T uses the "L" watchdog timeout option, delivering 209s typical timeout (95–487s min/max), as indicated by the "S" in its orderable part number being replaced by "L" per Table 3. The timeout is fixed-not user-selectable-and clears on any rising or falling edge at WDI (pin 4). No external components or configuration pins are needed.
Can MAX6865UK45D6S+T operate with VCC below 1.8V?
Yes, MAX6865UK45D6S+T operates across VCC = 1.2V to 5.5V and guarantees valid RESET output down to VCC = +1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. At 1.2V, supply current is 190nA (typ), and reset threshold remains accurate within ±2.5%-enabling reliable supervision in ultra-low-voltage energy-harvesting or coin-cell systems.
Is MAX6865UK45D6S+T pin-compatible with other devices in the MAX68xx family?
MAX6865UK45D6S+T shares the identical 5-pin SOT23-5 pinout with MAX6864, MAX6866, MAX6867, MAX6868, and MAX6869 (per Pin Configurations, page 15), including VCC (pin 5), GND (pin 2), MR (pin 3), WDI (pin 4), and RESET (pin 1). However, RESET polarity differs: MAX6865 uses active-high push-pull, while MAX6864/MAX6866 use active-low-requiring schematic review before substitution.
MAX6865UK45D6S+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:
- 4.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK45D6S+T FAQ
1.How can I place an order for MAX6865UK45D6S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK45D6S+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 MAX6865UK45D6S+T reliable?
The price and inventory of MAX6865UK45D6S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK45D6S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK45D6S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK45D6S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK45D6S+T?
MAX6865UK45D6S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK45D6S+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 MAX6865UK45D6S+T?
For technical support, including MAX6865UK45D6S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK45D6S+T requirements.
6.How does Aetrix verify that MAX6865UK45D6S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK45D6S+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 MAX6865UK45D6S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK45D6S+T?
All MAX6865UK45D6S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK45D6S+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 MAX6865UK45D6S+T part is unused and in its original packaging.
Return procedure for MAX6865UK45D6S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6865UK45D6S+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…
