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Analog Devices Inc./Maxim Integrated MAX6864UK26D3S+T
- Part No.:
- MAX6864UK26D3S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6864UK26D3S+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,778
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Product details
Overview
The MAX6864UK26D3S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring voltage monitoring (2.625V factory-trimmed reset threshold), manual reset input (MR), and watchdog timer (3.3s typical timeout). It asserts an active-low push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, with guaranteed reset validity down to VCC = +1.1V. It targets ultra-low-power portable medical and consumer devices requiring reliable power-on reset and firmware crash recovery.
For engineers reviewing the MAX6864UK26D3S+T datasheet, MAX6864UK26D3S+T pinout, MAX6864UK26D3S+T application, or MAX6864UK26D3S+T equivalent, this page delivers verified electrical parameters, functional timing behavior, real-world use cases for battery-powered systems, and validated alternative options - all confirmed against Maxim's official documentation and ordering guide.
Technical Context
The MAX6864UK26D3S+T integrates three core functions: precision voltage monitoring with ±2.5% threshold accuracy over temperature, a glitch-immune manual reset input with 1µs minimum pulse width and internal 10kΩ pullup, and a watchdog timer that clears on any WDI edge and expires after 3.3s (typ) if no transition occurs. Its reset output remains asserted for 150ms (min) after VCC recovery or MR release.
This device operates across VCC = 1.2V to 5.5V and draws only 170nA (typ) supply current at 2.5V, enabling multi-year operation on coin cells. It guarantees valid reset signaling down to VCC = +1.1V and tolerates short VCC transients ≤40µs at 100mV overdrive - critical for noisy battery-supplied environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V (factory-trimmed, ±2.5% tolerance); ensures reliable detection of brownout below nominal 2.7V–2.8V rail |
| Supply Current | 170nA (typ) at 2.5V; enables >10-year battery life in always-on glucose monitors |
| Reset Timeout Period | 150ms (min); provides sufficient time for µP initialization before releasing reset |
| Watchdog Timeout | 3.3s (typ); balances fault detection speed with software execution margin in embedded firmware |
| VCC Operating Range | 1.2V to 5.5V; supports single-cell Li-ion (3.0–4.2V), alkaline (1.5V), and regulated 3.3V/5V rails |
| Reset Output Type | Push-pull active-low; eliminates need for external pullup and drives standard CMOS reset inputs directly |
| Guaranteed Reset Validity | Down to VCC = +1.1V; ensures deterministic reset state even during deep discharge |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; sinks ≥500µA at VCC ≥ 2.38V, drives µP reset pin directly without pullup |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane for noise immunity |
| 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; detects rising/falling edges; resets internal timer on each transition; immune to <150ns pulses |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF ceramic bypass capacitor to GND for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables decade-scale operation on CR2032 coin cells |
| Factory-trimmed VTH | 2.625V threshold with ±2.5% accuracy over -40°C to +85°C avoids external resistor calibration |
| Watchdog immunity | Clears on any WDI edge (rising or falling); prevents false timeouts from stuck logic states |
| VCC transient rejection | Immune to ≤40µs VCC glitches at 100mV overdrive; eliminates spurious resets in noisy power domains |
| No external components | Internal MR pullup, precise VTH, and fixed tRP eliminate BOM parts and layout complexity |
Applications
| Glucose Monitor Power Management | Patient Vital Sign Logger |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission powered by single CR2032 cell. IC Role / Device Role / Timing Role: Supervises 2.7V regulated rail, triggers hardware reset on brownout or firmware hang via WDI polling. Use Value: 170nA ICC extends battery life beyond 2 years; 3.3s watchdog timeout allows full BLE stack reinitialization before reset. |
Use Scenario: Portable ECG/SpO₂ logger recording data every 5 seconds and storing locally. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output and asserts RESET if µP fails to toggle WDI within 3.3s during sleep/wake cycles. Use Value: Guaranteed reset validity to VCC = +1.1V ensures safe shutdown before memory corruption at end-of-life battery voltage. |
| Smart Hearing Aid Controller | Wireless Sensor Node |
Use Scenario: Rechargeable hearing aid with ultra-low-power DSP and RF transceiver. IC Role / Device Role / Timing Role: Provides power-on reset and watchdog supervision of audio processing firmware; MR enables user-initiated recalibration. Use Value: 150ms min reset timeout accommodates slow-starting analog front-end; MR glitch rejection (200ns) prevents accidental reset from ESD events. |
Use Scenario: Battery-powered environmental sensor node transmitting temperature/humidity hourly via LoRaWAN. IC Role / Device Role / Timing Role: Supervises 3.0V boost converter output and monitors µC activity via WDI to recover from radio lockups. Use Value: 2.625V reset threshold aligns precisely with Li-ion cutoff voltage (2.5–2.7V), preventing operation in unsafe low-voltage region. |
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 | Same package, pinout, and reset threshold, but 209s (typ) watchdog timeout instead of 3.3s | Suitable for infrequently polled systems (e.g., monthly telemetry nodes) where long fault-detection latency is acceptable | Select when firmware update cycles or sensor read intervals exceed 10s; avoid for real-time control loops |
| TPS3836K26DBVR | 2.63V reset threshold, 200ms reset timeout, no watchdog; 5-pin SOT23, push-pull active-low RESET | Lacks watchdog functionality; requires external reset management logic for firmware crash recovery | Choose only if watchdog is unnecessary and cost reduction outweighs loss of autonomous fault recovery |
Compared with MAX6864UK26D3S+T, the L-suffix variant trades fast fault response (3.3s) for extended supervision windows (209s), while the TPS3836K26DBVR removes watchdog capability entirely - making it a functional subset for simpler designs where software-level watchdog handling is already implemented.
Availability
MAX6864UK26D3S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered wearables, and low-power IoT sensors requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6864UK26D3S+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 management, sensing, and interface applications in demanding industrial and medical environments.
The MAX6864UK26D3S+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for ultra-low-current battery-operated systems needing robust voltage monitoring, manual reset, and autonomous watchdog protection without external components.
FAQ
What is the exact reset threshold voltage of the MAX6864UK26D3S+T?
The MAX6864UK26D3S+T has a factory-trimmed reset threshold of 2.625V, with ±2.5% tolerance over the full operating temperature range (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "26" corresponds to 2.625V. The MAX6864UK26D3S+T maintains this accuracy without calibration or external components.
Does the MAX6864UK26D3S+T require external components for basic operation?
No, the MAX6864UK26D3S+T operates autonomously with no external components required. Its internal 10kΩ MR pullup, factory-trimmed 2.625V threshold, fixed 150ms reset timeout, and 3.3s watchdog period eliminate the need for resistors, capacitors, or trimming networks. Only a 0.1µF VCC bypass capacitor is recommended for noise suppression - not mandatory for functionality.
How does the watchdog timer in the MAX6864UK26D3S+T respond to software hangs?
The MAX6864UK26D3S+T watchdog timer expires after 3.3s (typ) if no rising or falling edge is detected on the WDI pin. Upon expiration, it asserts the active-low RESET output for 150ms (min), forcing a full µP restart. The timer clears instantly on any WDI transition, enabling reliable recovery from infinite loops or stalled firmware - a key feature confirmed in the Functional Diagram and Watchdog Timing section.
Can the MAX6864UK26D3S+T operate down to 1.2V supply voltage?
Yes, the MAX6864UK26D3S+T is fully specified to operate from VCC = 1.2V to 5.5V. Its 170nA typical supply current and guaranteed reset validity down to VCC = +1.1V make it compatible with deeply discharged single-cell lithium or alkaline sources. Electrical Characteristics tables explicitly list performance at 1.2V, confirming functionality across this entire range.
Is the MAX6864UK26D3S+T pin-compatible with other devices in the MAX68xx family?
Yes, the MAX6864UK26D3S+T uses the standard 5-pin SOT23-5 pinout shared across the MAX6864–MAX6869 series (Pin 1: RESET, Pin 2: GND, Pin 3: MR, Pin 4: WDI, Pin 5: VCC). This allows direct substitution within the same functional group (watchdog-enabled, push-pull active-low RESET), provided the reset threshold and timeout match design requirements.
MAX6864UK26D3S+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:
- Active
- 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
MAX6864UK26D3S+T FAQ
1.How can I place an order for MAX6864UK26D3S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6864UK26D3S+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 MAX6864UK26D3S+T reliable?
The price and inventory of MAX6864UK26D3S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6864UK26D3S+T is usually 5 days.
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4.How is shipping managed for MAX6864UK26D3S+T?
MAX6864UK26D3S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6864UK26D3S+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 MAX6864UK26D3S+T?
For technical support, including MAX6864UK26D3S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6864UK26D3S+T requirements.
6.How does Aetrix verify that MAX6864UK26D3S+T is sourced from the original manufacturer or authorized distributors?
All MAX6864UK26D3S+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 MAX6864UK26D3S+T meets industry standards.
7.What is the process for return or replacement of MAX6864UK26D3S+T?
All MAX6864UK26D3S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6864UK26D3S+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 MAX6864UK26D3S+T part is unused and in its original packaging.
Return procedure for MAX6864UK26D3S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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