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Analog Devices Inc./Maxim Integrated MAX6854UK20D1+T
- Part No.:
- MAX6854UK20D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6854UK20D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,947
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Product details
Overview
The MAX6854UK20D1+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and fixed 10ms minimum reset timeout. It asserts an active-low push-pull RESET when VCC drops below 2.000V (±2.5%), during MR assertion, or at power-up/brownout - guaranteeing valid reset down to VCC = +1.1V. It targets ultra-low-power portable systems such as glucose monitors and battery-powered PDAs.
For engineers reviewing the MAX6854UK20D1+T datasheet, MAX6854UK20D1+T pinout, MAX6854UK20D1+T application, or MAX6854UK20D1+T equivalent, key selection criteria include its 170nA typical supply current, factory-trimmed 2.000V reset threshold, 10ms reset timeout, MR input with 10kΩ internal pullup, and immunity to sub-40µs VCC transients - all critical for reliable low-voltage embedded reset management.
Technical Context
This device integrates a precision voltage comparator with hysteresis (0.5% of VTH), a digital reset timeout timer, and a noise-immune manual reset input with 200ns glitch rejection. Its internal 10kΩ MR pullup eliminates external components, and the push-pull RESET output drives directly into µP reset inputs without external pullups.
The MAX6854UK20D1+T operates across VCC = 1.2V to 5.5V and guarantees functional reset assertion down to VCC = 1.1V. It features no watchdog timer or CT pin - distinguishing it from MAX6861–MAX6869 and MAX6864–MAX6869 variants - and uses BiCMOS process technology for nanopower performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.000V ±2.5% - precisely monitors 2.0V rails; ensures reset before µP brownout |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in portable medical devices |
| Reset Timeout | 10ms (min) - meets fast-recovery requirements for low-latency embedded boot sequences |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail systems |
| RESET Output Type | Push-pull active-low - drives µP reset directly; no external pullup required |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies PCB layout; compatible with open-drain CMOS |
| Reset Valid Down To | VCC = +1.1V - ensures deterministic reset state even during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) optimized for space-constrained portable designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; sinks ≥50µA at VCC ≥1.1V; asserts during VCC drop, MR low, or power-up |
| 2 | GND | Ground reference for all internal circuitry; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS logic levels |
| 4 | GND | Second ground terminal - electrically tied to Pin 2; improves noise immunity in high-frequency layouts |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in always-on medical sensors and wearables |
| Guaranteed reset validity | Down to VCC = +1.1V - prevents undefined µP states during deep undervoltage conditions |
| No external components required | Integrated MR pullup and precision threshold - reduces BOM count and layout area |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - avoids spurious resets in noisy power environments |
| Fixed 10ms reset timeout | Meets JEDEC JESD78 reliability requirements for minimum reset pulse width |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission in disposable wearable patches. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset on battery voltage sag during RF transmission bursts. Use Value: Prevents firmware lockup during 1.8V brownout; 170nA quiescent current enables >2-year coin-cell operation. |
Use Scenario: Portable ECG/SpO₂ units powered by single AAA alkaline cells. IC Role / Device Role / Timing Role: Voltage monitor and manual reset enabler for clinical-grade boot integrity. Use Value: 2.000V threshold aligns with AAA end-of-life voltage; 10ms timeout satisfies IEC 62304 power-on self-test timing. |
| Smart Pagers | Industrial Handheld Terminals |
Use Scenario: Two-way pagers with intermittent GPS and cellular wake-up in remote field deployments. IC Role / Device Role / Timing Role: Brownout detector ensuring clean µP restart after cold temperature-induced voltage droop. Use Value: Valid reset down to 1.1V prevents corrupted RAM writes during -20°C battery discharge. |
Use Scenario: Ruggedized barcode scanners operating on rechargeable LiFePO₄ packs with wide VCC swing. IC Role / Device Role / Timing Role: Primary reset supervisor coordinating bootloader initialization after power recovery. Use Value: Push-pull RESET eliminates need for external pullup, reducing component count in IP67-sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K20DBVR | 2.0V reset threshold, 200ms min timeout, 1.2µA ICC - 7× higher supply current | Designed for industrial temp range (-40°C to +125°C); lacks MR input | Select if extended temperature range is required and longer timeout acceptable |
| STM6315SW12D6F | 2.0V threshold, 10ms timeout, 350nA ICC - 2× higher quiescent current | Open-drain RESET output; requires external pullup; no MR input | Select if open-drain interface is needed for level-shifting or wired-OR reset buses |
Compared with TPS3836K20DBVR and STM6315SW12D6F, the MAX6854UK20D1+T delivers the lowest supply current (170nA) and includes a dedicated MR input - making it optimal for battery-critical, user-resettable portable medical and consumer electronics where minimal BOM and guaranteed 1.1V reset validity are essential.
Availability
MAX6854UK20D1+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, smart pagers, and industrial handheld terminals requiring stable component supply with long-term lifecycle support.
Supply support for MAX6854UK20D1+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 connectivity in demanding industrial, medical, and automotive applications.
The MAX6854UK20D1+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for ultra-low-power portable electronics where battery longevity, small size, and robust brownout protection are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6854UK20D1+T?
The MAX6854UK20D1+T has a factory-trimmed reset threshold of 2.000V with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) where suffix "20" corresponds to 2.000V, and in Electrical Characteristics where VTH is specified as VTH ±2.5%. The device guarantees reset assertion when VCC falls below this threshold.
Does the MAX6854UK20D1+T include a watchdog timer?
No, the MAX6854UK20D1+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 and MAX6867–MAX6869 variants feature WDI input and watchdog functionality. The MAX6854UK20D1+T is a basic supervisory circuit with voltage monitoring and manual reset only - confirmed by its absence in the WDI-related tables and functional diagram branches.
What is the function of Pin 4 on the MAX6854UK20D1+T?
Pin 4 on the MAX6854UK20D1+T is a second GND terminal, electrically connected to Pin 2. As shown in the "MAX6854/MAX6855/MAX6856 Pin Description" table and top-view pinout, both Pins 2 and 4 are labeled GND. This dual-ground configuration improves noise immunity and thermal dissipation in high-density portable PCB layouts.
Can the MAX6854UK20D1+T operate with a 1.5V supply?
Yes, the MAX6854UK20D1+T supports VCC as low as 1.2V and guarantees valid reset operation down to 1.1V. At 1.5V supply, it remains fully functional: the 2.000V reset threshold is still monitored (asserting reset if VCC falls below that point), supply current is ~190nA (per Electrical Characteristics), and RESET output maintains VOL ≤0.3V with 50µA sink current - enabling use in single-alkaline or low-VCC energy-harvesting systems.
Is the MAX6854UK20D1+T pin-compatible with other devices in the MAX685x family?
The MAX6854UK20D1+T shares the same 5-pin SOT23-5 package and pinout (RESET–GND–MR–GND–VCC) with MAX6854, MAX6855, and MAX6856 variants. However, it is not pin-compatible with MAX6858/MAX6860 (which repurpose Pin 1 as I.C.) or MAX6861–MAX6869 (which use Pin 1 for CT or WDI). Compatibility is limited to the MAX6854-series base configuration per the Selector Guide and Pin Configurations diagrams.
MAX6854UK20D1+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:
- 2V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6854UK20D1+T FAQ
1.How can I place an order for MAX6854UK20D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6854UK20D1+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 MAX6854UK20D1+T reliable?
The price and inventory of MAX6854UK20D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6854UK20D1+T is usually 5 days.
3.What payment methods are accepted for MAX6854UK20D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6854UK20D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6854UK20D1+T?
MAX6854UK20D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6854UK20D1+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 MAX6854UK20D1+T?
For technical support, including MAX6854UK20D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6854UK20D1+T requirements.
6.How does Aetrix verify that MAX6854UK20D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6854UK20D1+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 MAX6854UK20D1+T meets industry standards.
7.What is the process for return or replacement of MAX6854UK20D1+T?
All MAX6854UK20D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6854UK20D1+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 MAX6854UK20D1+T part is unused and in its original packaging.
Return procedure for MAX6854UK20D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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