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Analog Devices Inc./Maxim Integrated MAX6862UK225+
- Part No.:
- MAX6862UK225+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6862UK225+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,334
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Product details
Overview
MAX6862UK225+ from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring pin-selectable 10ms/150ms reset timeout, active-high push-pull RESET output, manual reset (MR) input, and guaranteed reset validity down to VCC = +1.1V. It monitors supply voltage with factory-trimmed 2.235V threshold and asserts reset during power-up, brownout, or MR assertion.
For engineers reviewing the MAX6862UK225+ datasheet, MAX6862UK225+ pinout, MAX6862UK225+ application, or MAX6862UK225+ equivalent, this device supports low-power portable systems requiring precise voltage monitoring, deterministic reset timing, and manual recovery without external components.
Technical Context
The MAX6862UK225+ implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over temperature, coupled with a digital timeout generator triggered by VCC drop, MR assertion, or watchdog expiration (though MAX6862 lacks WDI). Its CT pin selects between two fixed minimum reset timeout periods-10ms (D1) or 150ms (D3)-with typical values of 15ms and 225ms respectively.
It uses BiCMOS process technology (2848 transistors) to achieve ultra-low 170nA typical supply current at 2.5V, enabling operation in battery-critical applications. The active-high push-pull RESET output drives high with VOH ≥ 0.8×VCC (at ISOURCE = 500µA), ensuring reliable µP reset signaling across its 1.2V–5.5V operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.235V (factory-trimmed, ±2.5% tolerance); ensures reliable detection of 2.2V nominal supply brownout |
| Supply Current (ICC) | 170nA typ at 2.5V; enables multi-year battery life in always-on medical or portable devices |
| Reset Timeout Options | Pin-selectable: 10ms min (CT = low) or 150ms min (CT = high); provides flexibility for fast-boot vs. slow-peripheral initialization |
| RESET Output Type | Active-high push-pull; eliminates need for external pullup and guarantees VOH ≥ 0.8×VCC into 500µA load |
| Minimum Valid VCC | +1.1V; guarantees RESET remains valid during deep brownout, supporting µP hold-up until safe shutdown |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC; accepts CMOS levels and requires no external biasing |
| Operating Temperature | -40°C to +85°C; qualified for industrial and portable consumer environments |
Pinout & Package
MAX6862UK225+ is housed in a lead-free 5-pin SOT23-5 package (JEDEC MO-178AA), footprint-compatible with industry-standard supervisory ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high during reset assertion, referenced to VCC |
| 2 | GND | Ground reference for all internal circuitry and reset timing; must be connected to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); initiates reset when pulled ≤0.3×VCC |
| 4 | CT | Reset timeout select input; logic low selects 10ms min timeout, logic high selects 150ms min timeout |
| 5 | VCC | Supply voltage input and monitored rail; operates from 1.2V to 5.5V; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical at 2.5V enables >10-year coin-cell operation in glucose monitors |
| Pin-selectable reset delay | CT pin toggles between 10ms (fast recovery) and 150ms (slow peripheral settling) without firmware change |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V, ensuring safe state retention during deep brownout |
| No external components required | Integrated MR pullup, precision threshold, and timeout generator eliminate BOM cost and layout area |
| Immunity to short VCC transients | Rejects ≤40µs transients at 100mV overdrive, preventing spurious resets in noisy power rails |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Portable handheld glucose meters powered by CR2032 coin cell with intermittent sensor activation. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to ARM Cortex-M0 during cold start and brownout, with 150ms timeout allowing ADC calibration. Use Value: 170nA ICC extends battery life beyond 3 years; 1.1V VCC min ensures reset remains valid during battery sag below 2.0V. |
Use Scenario: Battery-backed bedside patient monitor with ECG, SpO₂, and display subsystems. IC Role / Device Role / Timing Role: Voltage supervisor triggering controlled µP reset on main 3.3V rail dropout, using CT = high for 150ms delay to synchronize peripheral power sequencing. Use Value: Pin-selectable timeout avoids firmware rework across product variants; ±2.5% VTH tolerance ensures consistent trip point across temperature. |
| MP3 Players | PDAs |
Use Scenario: Flash-based MP3 player with Li-ion battery and USB charging, requiring clean boot after charge insertion. IC Role / Device Role / Timing Role: Active-high RESET generator asserting reset on VCC ramp, with CT = low for 10ms timeout to enable rapid UI wake-up. Use Value: Push-pull output eliminates pullup resistor, saving PCB space and leakage; 5-pin SOT23 fits tight form factors. |
Use Scenario: Legacy PDA with aging battery and variable load causing 3.3V rail instability during wireless sync. IC Role / Device Role / Timing Role: Supervisory circuit monitoring 3.3V supply and providing manual reset via front-panel button (MR input). Use Value: Internal 10kΩ MR pullup removes external bias component; 170nA ICC minimizes standby drain during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K225DBVR | Fixed 2.25V threshold, 200ms reset timeout, open-drain RESET, 1.6µA ICC | Lacks pin-selectable timeout and MR input; requires external pullup; higher supply current limits battery life | Choose if open-drain interface to 5V logic is required and timeout flexibility is not needed |
| MAX6316LUK225+ | 2.25V threshold, 140ms timeout, active-low open-drain RESET, 1.2µA ICC, no MR or CT pin | No manual reset capability; incompatible RESET polarity; higher ICC reduces energy efficiency | Consider only for legacy designs where active-low open-drain is mandatory and MR is unused |
Compared with TPS3837K225DBVR and MAX6316LUK225+, the MAX6862UK225+ delivers 7× lower supply current, pin-selectable reset timing, integrated MR pullup, and active-high push-pull output-enabling longer battery life and simpler board design in portable medical and consumer electronics.
Availability
MAX6862UK225+ is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and PDAs requiring stable component supply with long-term lifecycle support and traceable sourcing.
Supply support for MAX6862UK225+ 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, with emphasis on low-power, high-reliability solutions.
The MAX6862UK225+ belongs to the MAX6854–MAX6869 nanopower µP supervisory family, engineered specifically for battery-powered medical and portable electronics needing ultra-low ICC, guaranteed reset validity at low VCC, and flexible timeout configuration.
FAQ
What is the exact reset threshold voltage of the MAX6862UK225+?
The MAX6862UK225+ has a factory-trimmed reset threshold voltage of 2.235V, with ±2.5% tolerance over temperature (-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 MAX6862UK225+ maintains this accuracy without external calibration.
Does the MAX6862UK225+ include a watchdog timer function?
No, the MAX6862UK225+ does not include a watchdog timer. It belongs to the MAX6861/MAX6862/MAX6863 subgroup, which features pin-selectable reset timeout (via CT pin) and manual reset (MR), but omits the WDI input and watchdog circuitry found in MAX6864–MAX6869 variants. The MAX6862UK225+ relies solely on VCC monitoring and MR assertion for reset generation.
How is the reset timeout period selected on the MAX6862UK225+?
The reset timeout period on the MAX6862UK225+ is selected using the CT pin: connect CT to GND for 10ms minimum timeout (D1 option), or connect CT to VCC for 150ms minimum timeout (D3 option). Typical values are 15ms and 225ms respectively, as specified in Table 1 of the datasheet. This selection is static and takes effect immediately upon power-up or reset release.
What is the RESET output type and drive capability of the MAX6862UK225+?
The MAX6862UK225+ features an active-high push-pull RESET output. When asserted, it drives high with VOH ≥ 0.8×VCC (tested at ISOURCE = 500µA and VCC ≥ 2.38V). When deasserted, it pulls low to VOL ≤ 0.3V (at ISINK = 1.2mA and VCC ≥ 2.38V). This eliminates the need for an external pullup resistor and ensures robust interfacing with µP reset inputs.
Is the MAX6862UK225+ compatible with other SOT23-5 supervisory ICs?
Yes, the MAX6862UK225+ uses a standard 5-pin SOT23-5 package (JEDEC MO-178AA) with pinout matching the MAX6861/MAX6863 family: Pin 1 = RESET, Pin 2 = GND, Pin 3 = MR, Pin 4 = CT, Pin 5 = VCC. It is pin-compatible with TPS3836/TPS3837/TPS3838 per datasheet Feature list, enabling drop-in replacement where CT functionality and active-high RESET are acceptable.
MAX6862UK225+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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
MAX6862UK225+ FAQ
1.How can I place an order for MAX6862UK225+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6862UK225+ 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 MAX6862UK225+ reliable?
The price and inventory of MAX6862UK225+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6862UK225+ is usually 5 days.
3.What payment methods are accepted for MAX6862UK225+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6862UK225+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6862UK225+?
MAX6862UK225+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6862UK225+ 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 MAX6862UK225+?
For technical support, including MAX6862UK225+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6862UK225+ requirements.
6.How does Aetrix verify that MAX6862UK225+ is sourced from the original manufacturer or authorized distributors?
All MAX6862UK225+ 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 MAX6862UK225+ meets industry standards.
7.What is the process for return or replacement of MAX6862UK225+?
All MAX6862UK225+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6862UK225+, 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 MAX6862UK225+ part is unused and in its original packaging.
Return procedure for MAX6862UK225+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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