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Analog Devices Inc./Maxim Integrated MAX6861UK16-T
- Part No.:
- MAX6861UK16-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6861UK16-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6861UK16-T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.575V reset threshold, pin-selectable 10ms/150ms (min) reset timeout, and active-low push-pull reset output. It monitors VCC voltage, responds to manual reset assertion, and ensures reliable system initialization in battery-powered medical and portable electronics.
For engineers reviewing the MAX6861UK16-T datasheet, MAX6861UK16-T pinout, MAX6861UK16-T application, or MAX6861UK16-T equivalent, key selection criteria include its 1.575V threshold accuracy, CT-pin programmable reset delay, guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients, and compatibility with low-voltage µP reset inputs.
Technical Context
The MAX6861UK16-T integrates a precision voltage monitor, manual reset input with 10kΩ internal pullup, and a reset timeout generator controlled by the CT pin-low selects 10ms (min), high selects 150ms (min). Its reset output remains asserted for the full timeout after VCC rises above 1.575V or MR deasserts.
It operates across -40°C to +85°C with supply voltage range 1.2V–5.5V, guarantees valid reset down to VCC = 1.1V, and exhibits <40µs immunity to 100mV VCC transients. No external components are required beyond standard 0.1µF VCC bypass capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Reset Threshold | 1.575V ±2.5% - factory-trimmed for precise brownout detection at low-voltage rails |
| Reset Timeout Options | 10ms or 150ms (min) - selected via CT pin logic level, eliminating need for external timing components |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input systems including single-cell Li-ion and 3.3V/5V logic domains |
| Reset Validity Limit | Guaranteed to VCC = +1.1V - ensures deterministic reset behavior during deep brownout conditions |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies manual reset implementation using momentary switch to GND |
| Package | 5-pin SOT23 - compact footprint compatible with space-constrained portable PCB layouts |
Pinout & Package
MAX6861UK16-T is housed in a 5-pin SOT23-5 package (3.0mm × 1.7mm × 1.3mm height), optimized for low-profile, high-density applications. Pin 1 is CT (Reset Timeout Select), Pin 2 is GND, Pin 3 is MR (Manual Reset Input), Pin 4 is RESET (Active-Low Push-Pull Output), and Pin 5 is VCC (Supply Input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CT | Reset Timeout Select Input | Logic-low selects 10ms (min) timeout; logic-high selects 150ms (min); no external bias required |
| 2 - GND | Ground Reference | Common return path for all internal circuits; must connect to system ground plane |
| 3 - MR | Active-Low Manual Reset Input | Pulled up internally to VCC via 10kΩ; asserts reset when driven ≤0.3×VCC |
| 4 - RESET | Active-Low Push-Pull Reset Output | Drives low during reset; actively drives high when deasserted - no external pullup needed |
| 5 - VCC | Supply Voltage Input | Monitored rail input; requires 0.1µF ceramic capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors and wearables |
| Pin-selectable tRP | CT pin eliminates need for external RC network - reduces BOM count and layout area |
| Valid reset to 1.1V | Ensures µP remains held in reset until supply stabilizes, preventing partial execution during power collapse |
| Transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - improves robustness in noisy automotive or industrial environments |
| No external components | Self-contained supervision - only 0.1µF VCC bypass cap required for stable operation |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 1.8V µP supply and asserts reset if voltage sags below 1.575V during RF burst transmission. Use Value: Prevents firmware corruption during battery voltage dip, ensuring clinical data integrity and regulatory compliance. |
Use Scenario: Portable ECG device operating from rechargeable Li-ion with sleep/wake cycles. IC Role / Device Role / Timing Role: Provides 150ms (min) reset hold time via CT=high to guarantee full µP initialization before ADC sampling begins. Use Value: Eliminates boot-time race conditions between power rail stabilization and analog front-end readiness. |
| MP3 Players | Smart Pagers |
|
Use Scenario: Flash-based audio player with dual-voltage (1.2V core / 3.3V I/O) architecture. IC Role / Device Role / Timing Role: Monitors 1.2V core rail using 1.575V threshold variant; CT pin set low for fast 10ms reset recovery after button wake-up. Use Value: Enables sub-100ms resume-from-sleep latency while maintaining safe core voltage margin. |
Use Scenario: Two-way pager with intermittent RF reception and long standby duration. IC Role / Device Role / Timing Role: Acts as primary reset supervisor for ARM Cortex-M0 host, asserting reset on VCC brownout and manual reset via tactile switch. Use Value: Guarantees deterministic state recovery after accidental power loss or user-initiated reboot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | Fixed 3.08V reset threshold; no CT pin; 200ms fixed timeout; 1.6µA ICC | Designed for 3.3V systems only; higher current draw limits battery lifetime in ultra-low-power designs | Select when 3.3V rail supervision is required and CT flexibility is unnecessary |
| MAX6315US29D3+ | 1.62V threshold; 200ms timeout; 1.2µA ICC; same SOT23-5 package | Higher supply current and fixed timeout reduce suitability for coin-cell medical devices | Choose for cost-sensitive industrial controls where 170nA is not mandatory |
Compared with TPS3836K33DBVR and MAX6315US29D3+, the MAX6861UK16-T delivers 10× lower supply current and unique CT-programmable reset timing-critical for extending battery life and optimizing boot sequence timing in portable healthcare electronics.
Availability
MAX6861UK16-T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and smart pagers requiring stable component supply with long-term lifecycle support and traceable sourcing.
Supply support for MAX6861UK16-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 communications applications.
The MAX6861UK16-T belongs to Maxim's nanopower µP supervisory family, designed specifically for battery-critical portable medical and consumer electronics requiring ultra-low ICC and precise, flexible reset control.
FAQ
What is the exact reset threshold voltage of the MAX6861UK16-T?
The MAX6861UK16-T has a factory-trimmed reset threshold of +1.575V, 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 "16" corresponds to 1.575V. The MAX6861UK16-T maintains this accuracy without external calibration.
How does the CT pin configure the reset timeout period on the MAX6861UK16-T?
On the MAX6861UK16-T, the CT pin selects between two minimum reset timeout periods: logic-low (≤0.2×VCC) configures 10ms (min), and logic-high (≥0.8×VCC) configures 150ms (min). This selection is latched internally and remains effective until changed; no external resistor or capacitor is needed, making the MAX6861UK16-T uniquely flexible among nanopower supervisors.
Does the MAX6861UK16-T include a watchdog timer function?
No, the MAX6861UK16-T does not include a watchdog timer. It belongs to the MAX6861/MAX6862/MAX6863 subgroup, which features manual reset and CT-selectable timeout but omits WDI functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants. The MAX6861UK16-T is strictly a voltage-monitoring and manual-reset supervisory circuit.
What is the maximum VCC transient duration the MAX6861UK16-T can tolerate without asserting reset?
The MAX6861UK16-T tolerates VCC transients up to 40µs in duration when the overdrive is 100mV (i.e., VCC dips 100mV below the 1.575V threshold), as shown in Figure MAX684 toc05. This transient immunity prevents spurious resets in electrically noisy environments, a key reliability feature confirmed in the Typical Operating Characteristics section of the MAX6861UK16-T datasheet.
Is the MAX6861UK16-T pin-compatible with other devices in the MAX68xx family?
Yes, the MAX6861UK16-T shares the same 5-pin SOT23-5 pinout as MAX6862UK16-T and MAX6863UK16-T, and is pin-compatible with TPS3836/TPS3837/TPS3838 series per the datasheet Feature list. However, pin functions differ across subgroups (e.g., CT replaces WDI or I.C.), so direct substitution requires verification of signal mapping and feature alignment for the specific MAX6861UK16-T use case.
MAX6861UK16-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.575V
- 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
MAX6861UK16-T FAQ
1.How can I place an order for MAX6861UK16-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6861UK16-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 MAX6861UK16-T reliable?
The price and inventory of MAX6861UK16-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6861UK16-T is usually 5 days.
3.What payment methods are accepted for MAX6861UK16-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6861UK16-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6861UK16-T?
MAX6861UK16-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6861UK16-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 MAX6861UK16-T?
For technical support, including MAX6861UK16-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6861UK16-T requirements.
6.How does Aetrix verify that MAX6861UK16-T is sourced from the original manufacturer or authorized distributors?
All MAX6861UK16-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 MAX6861UK16-T meets industry standards.
7.What is the process for return or replacement of MAX6861UK16-T?
All MAX6861UK16-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6861UK16-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 MAX6861UK16-T part is unused and in its original packaging.
Return procedure for MAX6861UK16-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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