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Analog Devices Inc./Maxim Integrated MAX6868UK29D3S+T
- Part No.:
- MAX6868UK29D3S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6868UK29D3S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,274
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Product details
Overview
The MAX6868UK29D3S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.925V reset threshold, 150ms minimum reset timeout (D3), and watchdog timer with 3.3s typical timeout (S suffix). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout or brownout - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6868UK29D3S+T datasheet, MAX6868UK29D3S+T pinout, MAX6868UK29D3S+T application, or MAX6868UK29D3S+T equivalent, key selection criteria include 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 noisy low-power embedded systems requiring deterministic reset timing.
Technical Context
The MAX6868UK29D3S+T integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. Its reset assertion logic combines VCC falling below 2.925V ±2.5%, MR low pulse ≥1µs, or WDI inactivity beyond 3.3s (typ), with reset deassertion delayed by 150ms (min) after VCC recovery and MR release.
It uses an internal 10kΩ pullup on MR and supports CMOS-level WDI transitions with 150ns minimum pulse width detection. The push-pull active-high RESET output drives high (≥0.8×VCC) when asserted and low (≤0.3V) when deasserted, with guaranteed operation across –40°C to +85°C and VCC = 1.2V to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V; enables multi-year battery life in always-on portable medical sensors. |
| Reset Threshold Voltage | 2.925V ±2.5%; factory-trimmed for precise brownout detection on 3.0V or 3.3V rails. |
| Reset Timeout Period | 150ms min (D3 option); ensures µP completes power-up initialization before release. |
| Watchdog Timeout | 3.3s typ (S suffix); balances fault detection speed against false trigger risk in firmware loops. |
| VCC Operating Range | 1.2V to 5.5V; supports wide-input battery systems including single-cell Li-ion and alkaline stacks. |
| Reset Validity Limit | Guaranteed to VCC = +1.1V; maintains reliable reset assertion during deep brownout conditions. |
| MR Input Pulse Width | ≥1µs minimum; accommodates mechanical switch bounce without external debouncing. |
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 | WDI | Watchdog input; rising/falling edge clears internal timer; must toggle within 3.3s to prevent reset. |
| 2 | GND | Ground reference for all internal circuits and reset output; requires low-impedance connection. |
| 3 | MR | Active-low manual reset; internally pulled up to VCC via 10kΩ; asserts reset when driven ≤0.3×VCC. |
| 4 | RESET | Push-pull active-high reset output; drives high (≥0.8×VCC) during reset, low (≤0.3V) otherwise. |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in wearable glucose monitors and patient telemetry. |
| Reset threshold accuracy | ±2.5% tolerance over temperature ensures consistent brownout response across –40°C to +85°C. |
| Watchdog glitch immunity | Detects WDI pulses as short as 150ns, rejecting EMI-induced false triggers in noisy medical environments. |
| No external components | Integrated MR pullup, precision voltage reference, and timeout generator eliminate BOM cost and layout area. |
| VCC transient immunity | Immune to 100mV VCC glitches <40µs duration, preventing spurious resets in switching power supply domains. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 7–14 days on lithium coin-cell power. IC Role / Device Role / Timing Role: Supervises MCU power-up, detects battery brownout, and resets firmware if sensor communication hangs. Use Value: Prevents missed glucose readings due to silent MCU lockup; 170nA ICC adds <0.5% annual battery drain. |
Use Scenario: Portable ECG/SpO₂ logger recording data every 30 seconds for 72-hour clinical studies. IC Role / Device Role / Timing Role: Monitors 3.0V LDO output, asserts reset on VCC dip below 2.925V, and watches WDI for firmware liveliness. Use Value: Ensures data integrity by forcing controlled reboot before corrupted memory writes occur. |
| Wireless Hearing Aids | Smart Inhaler Sensors |
|
Use Scenario: Rechargeable hearing aid with Bluetooth LE streaming and real-time audio processing. IC Role / Device Role / Timing Role: Provides 150ms reset hold time to stabilize RF subsystem clocks before MCU boot sequence begins. Use Value: Eliminates RF link dropouts caused by premature release of reset during power-rail settling. |
Use Scenario: Disposable inhaler with MEMS flow sensor and BLE reporting triggered per actuation. IC Role / Device Role / Timing Role: Watches WDI toggled by actuation counter firmware; resets MCU if sensor read fails or BLE stack stalls. Use Value: Guarantees accurate dose tracking by recovering from firmware faults without user intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK29D3S+T | Same 2.925V threshold, D3 timeout, S-watchdog, but push-pull active-low RESET output. | Requires inverted reset logic on host µP; not drop-in for active-high RESET designs. | Select MAX6864UK29D3S+T only if µP reset pin is active-low and board layout allows RESET polarity change. |
| TPS3836K29DBVR | 2.93V threshold, 200ms timeout, no watchdog; 1.5µA ICC (10× higher than MAX6868UK29D3S+T). | Suitable for simpler brownout-only supervision where ultra-low ICC is not critical. | Choose TPS3836K29DBVR only when watchdog functionality is unnecessary and 170nA ICC is not required. |
Compared with MAX6864UK29D3S+T and TPS3836K29DBVR, the MAX6868UK29D3S+T uniquely delivers active-high RESET, 170nA ICC, and integrated watchdog in one 5-pin SOT23 - enabling compact, long-life, fail-safe supervision for next-gen medical wearables.
Availability
MAX6868UK29D3S+T is available at Aetrix Electronics and suitable for glucose monitors, patient loggers, and wireless hearing aids requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6868UK29D3S+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 demanding industrial, medical, and communications applications.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-critical portable medical and consumer electronics, emphasizing nanoscale ICC and robust reset timing under dynamic VCC conditions.
FAQ
What is the exact reset threshold voltage of the MAX6868UK29D3S+T?
The MAX6868UK29D3S+T has a factory-trimmed reset threshold of 2.925V, 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 "29" corresponds to 2.925V nominal. The MAX6868UK29D3S+T maintains this accuracy without external calibration.
Does the MAX6868UK29D3S+T support active-high or active-low reset output?
The MAX6868UK29D3S+T features a push-pull active-high RESET output - it drives high (≥0.8×VCC) when reset is asserted and low (≤0.3V) when deasserted. This is confirmed in the Pin Description section for MAX6868 (page 9) and Selector Guide (page 16), where MAX6868 is marked under "Push-Pull ACTIVE HIGH".
What is the watchdog timeout period for the MAX6868UK29D3S+T?
The MAX6868UK29D3S+T has a watchdog timeout period of 3.3s (typical), specified by the "S" suffix in the part number. Table 3 (Watchdog Timeout) confirms "S" = 1.5s (min), 3.3s (typ), 7.75s (max). The timer resets on any WDI edge and expires only if WDI remains static beyond this window.
Can the MAX6868UK29D3S+T operate down to 1.2V supply voltage?
Yes, the MAX6868UK29D3S+T operates across VCC = 1.2V to 5.5V, with full functionality including reset assertion, MR response, and watchdog monitoring. Electrical Characteristics (page 2) specify VCC min = 1.2V for TA = –40°C to +85°C, and reset remains valid down to VCC = +1.1V - ensuring reliability during deep brownout.
Is the MAX6868UK29D3S+T pin-compatible with other devices in the MAX68xx family?
The MAX6868UK29D3S+T uses the standard 5-pin SOT23-5 package and shares identical pinout with MAX6867/MAX6869 (WDI on Pin 1, GND on Pin 2, MR on Pin 3, RESET on Pin 4, VCC on Pin 5). However, it is not pin-compatible with MAX6861–MAX6863 (CT on Pin 1) or MAX6864–MAX6866 (MR on Pin 3, WDI on Pin 4), as pin functions differ across subfamilies.
MAX6868UK29D3S+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:
- 2.925V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6868UK29D3S+T FAQ
1.How can I place an order for MAX6868UK29D3S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6868UK29D3S+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 MAX6868UK29D3S+T reliable?
The price and inventory of MAX6868UK29D3S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6868UK29D3S+T is usually 5 days.
3.What payment methods are accepted for MAX6868UK29D3S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6868UK29D3S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6868UK29D3S+T?
MAX6868UK29D3S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6868UK29D3S+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 MAX6868UK29D3S+T?
For technical support, including MAX6868UK29D3S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6868UK29D3S+T requirements.
6.How does Aetrix verify that MAX6868UK29D3S+T is sourced from the original manufacturer or authorized distributors?
All MAX6868UK29D3S+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 MAX6868UK29D3S+T meets industry standards.
7.What is the process for return or replacement of MAX6868UK29D3S+T?
All MAX6868UK29D3S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6868UK29D3S+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 MAX6868UK29D3S+T part is unused and in its original packaging.
Return procedure for MAX6868UK29D3S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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