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Analog Devices Inc./Maxim Integrated MAX6863UK225+T
- Part No.:
- MAX6863UK225+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6863UK225+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,365
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Product details
Overview
The MAX6863UK225+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring a factory-trimmed 2.235V reset threshold, pin-selectable 10ms/150ms (min) reset timeout, manual reset input (MR), and no watchdog timer. It asserts an active-low open-drain RESET output during VCC brownout, power-up, or MR assertion, and guarantees valid reset down to VCC = +1.1V. It targets ultra-low-power portable medical and consumer devices requiring reliable, low-current supervision.
For engineers reviewing the MAX6863UK225+T datasheet, MAX6863UK225+T pinout, MAX6863UK225+T application, or MAX6863UK225+T equivalent, key selection criteria include its 170nA typical supply current, 2.235V reset threshold tolerance (±2.5%), CT-pin configurable timeout, immunity to short VCC transients (<40µs at 100mV overdrive), and guaranteed operation across –40°C to +85°C.
Technical Context
The MAX6863UK225+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and a digital timeout generator controlled by the CT pin-low selects D1 (10ms min), high selects D3 (150ms min). Its internal 10kΩ MR pullup enables direct switch-to-GND manual reset without external components.
It uses BiCMOS process technology (2848 transistors) to achieve ultra-low ICC (170nA typ at 2.5V) while maintaining robust noise immunity: MR glitch rejection is 200ns, and it remains immune to VCC transients ≤40µs when overdriven by 100mV below VTH. RESET output is open-drain, requiring external pullup, and sinks ≥50µA at VOL ≤0.3V (VCC ≥1.1V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V; enables multi-year battery life in glucose monitors and wearables. |
| Reset Threshold | 2.235V ±2.5%; factory-trimmed for accuracy without calibration-matches common 2.2V/2.25V system rails. |
| Reset Timeout | Pin-selectable: 10ms (min) or 150ms (min); CT = GND → D1, CT = VCC → D3-no firmware or external RC needed. |
| Operating Voltage Range | VCC = 1.2V to 5.5V; valid reset asserted down to VCC = 1.1V-ensures supervision through deep brownout. |
| Reset Output Type | Active-low open-drain; supports level-shifting to µP logic supplies up to 5.5V via external pullup. |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC; accepts CMOS levels; 1µs minimum pulse width; 200ns glitch rejection. |
| Package | 5-pin SOT23-5; footprint-compatible with TPS3836/TPS3837/TPS3838-enables drop-in replacement in existing designs. |
Pinout & Package
MAX6863UK225+T is housed in a lead-free 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable PCBs. Pin 1 is CT (Reset Timeout Select), Pin 2 is GND, Pin 3 is MR (Manual Reset), Pin 4 is RESET (open-drain active-low), and Pin 5 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CT | Reset Timeout Select Input | Logic level sets timeout: GND → 10ms (min), VCC → 150ms (min); no external components required. |
| 2 - GND | Ground Reference | Common return path for all internal circuits; must connect to system ground plane for noise immunity. |
| 3 - MR | Active-Low Manual Reset Input | Pull low to force reset; internally pulled up to VCC (10kΩ); compatible with momentary switches or logic drivers. |
| 4 - RESET | Open-Drain Active-Low Reset Output | Sinks current when asserted; requires external pullup resistor to target logic rail (e.g., 10kΩ to 3.3V). |
| 5 - VCC | Supply Voltage Input | Monitored rail input; bypass with 0.1µF ceramic capacitor to GND near pin for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical at 2.5V-extends battery life in single-cell coin-cell applications like patient monitors. |
| Factory-trimmed reset threshold | 2.235V ±2.5%-eliminates need for external resistive dividers or calibration in production test. |
| Pin-selectable reset timeout | D1 (10ms min) or D3 (150ms min) via CT pin-supports both fast-boot and long-hold reset requirements in one BOM item. |
| Open-drain RESET with wide voltage compatibility | RESET sinks ≥50µA at VOL ≤0.3V (VCC ≥1.1V) and interfaces to logic rails up to 5.5V-simplifies mixed-voltage system design. |
| Guaranteed reset validity to VCC = 1.1V | Ensures deterministic reset behavior during deep brownout-critical for data integrity in memory-backed medical devices. |
Applications
| Glucose Monitors | Portable ECG Devices |
|---|---|
|
Use Scenario: Battery-powered handheld glucose meters operating from a single 3V CR2032 coin cell with intermittent sensor activation. IC Role / Device Role / Timing Role: Supervises 3.0V system rail and triggers hardware reset on brownout or user-initiated recalibration. Use Value: 170nA ICC extends battery life beyond 2 years; 2.235V threshold aligns precisely with ADC reference stability margin; CT pin allows timeout optimization for sensor warm-up timing. |
Use Scenario: Wearable single-lead ECG patch transmitting data via BLE, powered by rechargeable Li-ion with tight voltage regulation. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output and asserts reset if voltage dips below safe operating range during RF transmission bursts. Use Value: Immunity to 40µs VCC transients prevents spurious resets during high-current BLE transmit events; open-drain RESET interfaces cleanly to BLE SoC's 1.8V reset input. |
| Smart Inhalers | Wireless Pulse Oximeters |
|
Use Scenario: Disposable Bluetooth-enabled inhaler tracking actuation count and environmental exposure using a 1.5V alkaline cell. IC Role / Device Role / Timing Role: Supervises stepped-up 2.2V rail powering MCU and sensor; CT pin configured for 10ms timeout to support rapid wake-from-sleep cycles. Use Value: Valid reset down to VCC = 1.1V ensures fail-safe shutdown before cell depletion; 10kΩ MR pullup enables direct push-button reset without added passives. |
Use Scenario: Clip-on fingertip pulse oximeter with OLED display, running on two AAA batteries with boost converter outputting 3.3V. IC Role / Device Role / Timing Role: Monitors 3.3V rail and provides 150ms reset hold time (CT = VCC) to ensure stable initialization of optical sensor and display driver. Use Value: Factory-trimmed 2.235V threshold avoids false resets during boost converter ripple; 150ms timeout exceeds typical OLED controller startup delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6861UK225+T | Same 2.235V threshold and CT-selectable timeout, but features push-pull active-low RESET instead of open-drain. | Requires VCC-referenced RESET load; unsuitable where level-shifting to higher logic rails is needed. | Select MAX6861UK225+T only when driving a VCC-synchronous reset input and board layout prohibits external pullup. |
| TPS3836K23DBVR | Fixed 2.32V threshold, 200ms fixed timeout, push-pull active-low RESET, 1.5µA ICC-higher current, no CT pin. | Lacks timeout configurability and ultra-low ICC; not suitable for multi-year battery life requirements. | Choose TPS3836K23DBVR only for cost-sensitive, non-battery-critical industrial controls where 1.5µA ICC is acceptable. |
Compared with MAX6863UK225+T, MAX6861UK225+T offers identical supervision accuracy and timeout flexibility but trades open-drain versatility for lower BOM count in VCC-synchronous systems; TPS3836K23DBVR provides TI-qualified supply chain continuity but sacrifices nanopower operation and pin-level timeout control.
Availability
MAX6863UK225+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, smart inhalers, and wireless pulse oximeters requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6863UK225+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 consumer markets.
The MAX6854–MAX6869 family delivers nanopower µP supervision with configurable timing and robust noise immunity-engineered specifically for battery-constrained portable medical and wearable electronics.
FAQ
What is the exact reset threshold voltage of the MAX6863UK225+T?
The MAX6863UK225+T has a factory-trimmed reset threshold of 2.235V, with guaranteed tolerance of ±2.5% over –40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "225" corresponds to VTH = 2.235V (min 2.180V, typ 2.235V, max 2.290V). The MAX6863UK225+T maintains this accuracy without external calibration.
How does the CT pin configure the reset timeout period on the MAX6863UK225+T?
On the MAX6863UK225+T, the CT pin selects between two minimum reset timeout periods: connecting CT to GND selects D1 (10ms min), and connecting CT to VCC selects D3 (150ms min). These values are specified in Table 1 and confirmed in the MAX6861/MAX6862/MAX6863 Pin Description section. The MAX6863UK225+T does not include a watchdog timer-CT exclusively controls timeout.
Is the MAX6863UK225+T pin-compatible with other supervisory ICs?
Yes-the MAX6863UK225+T is pin-compatible with the TPS3836/TPS3837/TPS3838 series per the datasheet's Features section. All share the same 5-pin SOT23-5 footprint and identical pin assignments (CT/MR/GND/RESET/VCC), enabling direct replacement in existing layouts where open-drain RESET and CT-based timeout selection are required.
What is the maximum supply voltage the MAX6863UK225+T can monitor?
The MAX6863UK225+T monitors VCC over a range of 1.2V to 5.5V, with guaranteed reset assertion down to VCC = 1.1V. Its absolute maximum rating for VCC is +6.0V (per Absolute Maximum Ratings table), but functional operation is only specified within 1.2V–5.5V. The MAX6863UK225+T is not rated for continuous operation above 5.5V.
Does the MAX6863UK225+T include a watchdog timer function?
No-the MAX6863UK225+T does not include a watchdog timer. It belongs to the MAX6861/MAX6862/MAX6863 subgroup, which features manual reset (MR) and pin-selectable timeout (CT) but omits WDI functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK225D3S+T), as confirmed in the Selector Guide and Pin Configurations sections.
MAX6863UK225+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.235V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6863UK225+T FAQ
1.How can I place an order for MAX6863UK225+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6863UK225+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 MAX6863UK225+T reliable?
The price and inventory of MAX6863UK225+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6863UK225+T is usually 5 days.
3.What payment methods are accepted for MAX6863UK225+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6863UK225+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6863UK225+T?
MAX6863UK225+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6863UK225+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 MAX6863UK225+T?
For technical support, including MAX6863UK225+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6863UK225+T requirements.
6.How does Aetrix verify that MAX6863UK225+T is sourced from the original manufacturer or authorized distributors?
All MAX6863UK225+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 MAX6863UK225+T meets industry standards.
7.What is the process for return or replacement of MAX6863UK225+T?
All MAX6863UK225+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6863UK225+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 MAX6863UK225+T part is unused and in its original packaging.
Return procedure for MAX6863UK225+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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