My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6865UK26D3L+T
- Part No.:
- MAX6865UK26D3L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK26D3L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,487
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6865UK26D3L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.625V reset threshold (suffix "26"), 300ms minimum reset timeout (suffix "D3"), and 209s typical watchdog timeout (suffix "L"). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout (WDI), serving as a critical power-on/brownout safeguard in battery-powered medical and portable electronics.
For engineers reviewing the MAX6865UK26D3L+T datasheet, MAX6865UK26D3L+T pinout, MAX6865UK26D3L+T application, or MAX6865UK26D3L+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), push-pull active-high RESET output, and compatibility with 1.2V–5.5V supply rails in space-constrained designs.
Technical Context
This device integrates three core functions: precision voltage monitoring with ±2.5% threshold accuracy over temperature, a glitch-immune manual reset input with 250ns MR-to-reset delay and internal 10kΩ pullup, and a watchdog timer that clears on any WDI edge and expires after 209s (typ) if inactive - all operating from a single 1.2V–5.5V supply with no external components required.
The MAX6865UK26D3L+T implements a deterministic reset assertion sequence: RESET goes high when VCC falls below 2.625V, MR is pulled low, or WDI remains static beyond 209s; it remains asserted for ≥300ms after VCC rises above threshold, MR deasserts, or watchdog expires - ensuring µP initialization stability during recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V - enables multi-year operation on coin-cell batteries without compromising supervision reliability. |
| Reset Threshold Voltage | 2.625V (factory-trimmed, ±2.5%) - matches common 2.5V/2.7V system rails and ensures accurate brownout detection. |
| Reset Timeout Period | 300ms min (D3 option) - provides sufficient time for µP power stabilization and clock lock before release. |
| Watchdog Timeout | 209s typ (L option) - supports long-loop firmware execution while detecting catastrophic hangs. |
| RESET Output Type | Push-pull active-high - eliminates need for external pullup, drives directly into µP reset input with VOH ≥ 0.8×VCC. |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input systems including Li-ion, alkaline, and regulated 3.3V/5V supplies. |
| Reset Validity Limit | Guaranteed to VCC = +1.1V - ensures reliable reset assertion even during deep brownout conditions. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault conditions; sinks/source current per VOH/VOL specs; no external pullup needed. |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return for all internal circuits. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; 250ns delay to RESET; immune to <200ns glitches. |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on each transition; detects pulses ≥150ns wide. |
| 5 | VCC | Supply and monitored voltage input - powers device and serves as reset monitor rail; requires 0.1µF bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors and wearable sensors. |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C ensures consistent brownout response across industrial temperature range. |
| VCC transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents false resets in noisy automotive or motor-control environments. |
| No external components | Operates with only a 0.1µF VCC bypass capacitor - reduces BOM count and PCB area in compact portable designs. |
| Watchdog edge sensitivity | Detects WDI transitions ≥150ns - allows low-frequency software polling without missing watchdog clears. |
Applications
| Glucose Monitor Power Management | Patient Monitor Brownout Protection |
|---|---|
Use Scenario: Continuous glucose sensing in handheld meters powered by CR2032 coin cell, requiring multi-year operation with periodic self-test and data logging. IC Role / Device Role / Timing Role: Supervises 2.5V regulated rail; asserts RESET on battery sag below 2.625V or firmware hang detected via WDI; holds reset ≥300ms for ADC and RF startup. Use Value: Prevents corrupted sensor readings or failed BLE transmissions during low-battery brownout by guaranteeing clean µP restart before measurement cycle begins. |
Use Scenario: Portable ECG and SpO₂ patient monitors operating from dual AA alkaline cells, subject to voltage droop under pulse-oximeter LED load. IC Role / Device Role / Timing Role: Monitors 3.3V system rail; triggers reset if VCC dips below 2.625V during LED flash or if firmware fails to toggle WDI every 209s. Use Value: Ensures clinical data integrity by forcing full µP reboot before next waveform acquisition, eliminating silent firmware lockups that could miss arrhythmia events. |
| MP3 Player Firmware Recovery | Cell Phone Baseband Reset Coordination |
Use Scenario: Flash-based audio players with complex UI and file system, prone to unresponsive states after SD card corruption or codec errors. IC Role / Device Role / Timing Role: Provides manual reset via button (MR) and automatic watchdog reset (WDI toggled by main loop); uses 300ms timeout to align with NAND flash ready timing. Use Value: Enables user-initiated recovery without battery removal, while watchdog catches infinite loops in audio decode threads before memory corruption escalates. |
Use Scenario: Dual-core smartphone baseband processors where application processor must coordinate reset sequencing with modem subsystem during OTA updates. IC Role / Device Role / Timing Role: Generates synchronized active-high RESET signal to both AP and BP; WDI driven by AP watchdog thread; D3 timeout ensures BP PLL lock completion before release. Use Value: Eliminates race conditions during modem reset by providing deterministic, µP-agnostic reset coordination with guaranteed timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK26D3L+T | Active-low push-pull RESET output instead of active-high; identical VTH, tRP, tWD, and pinout. | Requires µP with active-low reset input; incompatible with active-high reset logic without level-shifting. | Select when interfacing to legacy µPs with active-low reset pins or when open-drain pullup conflicts exist. |
| TPS3836K26DBVR | 1.6µA typical ICC (vs. 170nA), same 2.63V threshold, 200ms timeout, no watchdog; SOT23-5 pin-compatible. | Lacks watchdog functionality; higher supply current limits battery life in always-on medical devices. | Choose for cost-sensitive, non-watchdog applications where 10× higher ICC is acceptable and watchdog is handled in firmware. |
Compared with MAX6865UK26D3L+T, MAX6864UK26D3L+T offers identical supervision timing but inverted RESET polarity, while TPS3836K26DBVR trades ultra-low power and watchdog capability for lower unit cost and simpler implementation in non-critical systems.
Availability
MAX6865UK26D3L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and cell phone baseband modules requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6865UK26D3L+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and consumer applications.
The MAX68xx family was designed specifically for ultra-low-power microprocessor supervision in battery-critical systems, integrating voltage monitoring, manual reset, and watchdog functionality into minimal 5-pin SOT23 packages without external components.
FAQ
What is the exact reset threshold voltage of the MAX6865UK26D3L+T?
The MAX6865UK26D3L+T has a factory-trimmed reset threshold voltage of 2.625V, with ±2.5% tolerance over the full -40°C to +85°C operating temperature range. This value is confirmed by the "26" suffix in the part number and specified in Table 2 of the datasheet. The MAX6865UK26D3L+T guarantees valid reset assertion down to VCC = +1.1V, making it suitable for deep brownout detection in low-voltage systems.
Does the MAX6865UK26D3L+T require external components for basic operation?
No, the MAX6865UK26D3L+T operates with no external components beyond a mandatory 0.1µF ceramic bypass capacitor from VCC to GND, as specified in the Typical Operating Circuit and Applications Information sections. Its internal 10kΩ MR pullup, precise voltage reference, and integrated watchdog timer eliminate the need for resistors, capacitors, or additional ICs - reducing BOM count and PCB area in space-constrained designs like portable medical devices.
What is the watchdog timeout behavior of the MAX6865UK26D3L+T?
The MAX6865UK26D3L+T features a watchdog timer with a typical timeout period of 209s (suffix "L"), with min/max values of 95s and 487s respectively. The timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond this period. When it expires, it asserts the active-high RESET output for the full 300ms reset timeout (suffix "D3"), ensuring µP recovery. This behavior is documented in Table 3 and the Watchdog Input section of the datasheet.
How does the MAX6865UK26D3L+T handle short VCC transients?
The MAX6865UK26D3L+T is specifically designed to reject short-duration VCC transients: it remains immune to glitches ≤40µs wide when the overdrive is 100mV above the 2.625V threshold, as shown in the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph. This immunity prevents false resets in electrically noisy environments such as motor-driven portable equipment or switching power supply domains - a key reliability feature confirmed in the Transient Immunity section.
Is the MAX6865UK26D3L+T pin-compatible with other devices in the MAX68xx family?
Yes, the MAX6865UK26D3L+T uses the standard 5-pin SOT23-5 package and shares identical pinout with all MAX6864–MAX6866 variants: Pin 1 = RESET (active-high push-pull), Pin 2 = GND, Pin 3 = MR, Pin 4 = WDI, Pin 5 = VCC. This allows direct substitution within the MAX6864/MAX6865/MAX6866 group when adjusting reset polarity or timeout options, provided the target design accommodates the active-high RESET output of the MAX6865UK26D3L+T.
MAX6865UK26D3L+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:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK26D3L+T FAQ
1.How can I place an order for MAX6865UK26D3L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK26D3L+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 MAX6865UK26D3L+T reliable?
The price and inventory of MAX6865UK26D3L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK26D3L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK26D3L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK26D3L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK26D3L+T?
MAX6865UK26D3L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK26D3L+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 MAX6865UK26D3L+T?
For technical support, including MAX6865UK26D3L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK26D3L+T requirements.
6.How does Aetrix verify that MAX6865UK26D3L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK26D3L+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 MAX6865UK26D3L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK26D3L+T?
All MAX6865UK26D3L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK26D3L+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 MAX6865UK26D3L+T part is unused and in its original packaging.
Return procedure for MAX6865UK26D3L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6865UK26D3L+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…
