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Analog Devices Inc./Maxim Integrated MAX6855UK21D6+T
- Part No.:
- MAX6855UK21D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK21D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,353
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Product details
Overview
MAX6855UK21D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, providing ultra-low 170nA typical supply current, factory-trimmed 2.100V reset threshold (±2.5%), and 600–1200ms minimum reset timeout period. It features active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C for battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK21D6+T datasheet, MAX6855UK21D6+T pinout, MAX6855UK21D6+T application, or MAX6855UK21D6+T equivalent, this page delivers verified electrical parameters, functional pin definitions, real-world use cases in glucose monitors and PDAs, and validated alternative parts with documented timing and output differences.
Technical Context
The MAX6855UK21D6+T integrates voltage monitoring, manual reset assertion, and reset timeout generation - but excludes watchdog timer and CT select functionality. Its active-high push-pull RESET output drives directly to VCC and remains asserted for ≥600ms after VCC exceeds 2.100V and MR deasserts.
Reset validity is guaranteed down to VCC = +1.1V; it rejects VCC transients ≤40µs at 100mV overdrive and supports CMOS-level MR input with 10kΩ internal pullup and 1µs minimum pulse width.
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 | 2.100V ±2.5% (VTH falling); factory-trimmed for precise brownout detection at 2.1V systems. |
| Reset Timeout | 600–1200ms min (D6 option); ensures full µP initialization before release. |
| RESET Output Type | Active-high push-pull; eliminates external pullup and interfaces directly with µP reset inputs requiring high-active logic. |
| VCC Operating Range | 1.2V to 5.5V; supports Li-ion, alkaline, and regulated 1.8V/2.5V/3.3V rails. |
| Reset Validity Voltage | Guaranteed to VCC = +1.1V; maintains deterministic reset state during deep brownout. |
| MR Input Logic | Active-low with 10kΩ internal pullup; accepts CMOS levels and requires no external biasing. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, 2.9mm × 1.6mm footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high when VCC < 2.100V or MR low; holds high for ≥600ms after recovery. |
| 2, 4 | GND | Ground reference for all internal circuitry; must connect to system ground plane with low-inductance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); asserts reset when pulled ≤0.3×VCC. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF ceramic bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in glucose monitors and wearables beyond 5 years. |
| No external components | Integrated MR pullup, precision voltage reference, and timeout generator eliminate BOM cost and layout area. |
| VCC transient immunity | Rejects ≤40µs glitches at 100mV overdrive, preventing spurious resets in noisy portable environments. |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = +1.1V ensures reliable boot sequencing even during severe brownout. |
| CMOS-compatible MR | Accepts standard logic levels without level-shifting; compatible with FPGA I/O, microcontroller GPIO, and open-drain drivers. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Portable handheld glucose meter powered by CR2032 coin cell with 1.8V LDO-regulated µP core. IC Role / Device Role / Timing Role: Supervises 1.8V supply rail and provides clean, glitch-immune power-on reset to ARM Cortex-M0. Use Value: 170nA ICC preserves battery capacity; 2.100V threshold matches LDO dropout margin; D6 timeout ensures full ADC calibration before firmware execution. |
Use Scenario: Battery-backed ECG module operating in intermittent-scan mode with sleep currents <1µA. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and asserts active-high RESET to wake microcontroller from deep sleep on power restoration. Use Value: Push-pull output eliminates pullup resistor; 1.1V reset validity guarantees deterministic state during partial discharge; MR allows clinical staff-initiated recalibration. |
| PDAs / Handheld Terminals | MP3 Players with Flash Storage |
|
Use Scenario: Legacy PDA with dual-rail power (1.8V core, 3.3V I/O) and user-accessible reset button. IC Role / Device Role / Timing Role: Provides primary reset supervision for 3.3V rail and debounced manual reset via front-panel switch. Use Value: Internal 10kΩ MR pullup removes external resistor; 600ms D6 timeout accommodates slow LDO startup and NAND controller initialization. |
Use Scenario: Flash-based MP3 player using 2.5V NAND storage and 1.2V µP core, powered by single Li-ion cell. IC Role / Device Role / Timing Role: Supervises 2.5V NAND supply and generates synchronized reset to prevent flash corruption during brownout. Use Value: 2.100V threshold aligns with NAND Vcc(min) spec; 170nA ICC avoids parasitic drain during 30-day shelf life; GND/VCC pin separation minimizes noise coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K21QDBVR | 2.1V threshold, 600ms timeout, active-high push-pull, but 1.5µA ICC (10× higher than MAX6855UK21D6+T). | Not suitable for >5-year coin-cell applications; better for 3.3V industrial controllers with ample power budget. | Select when lower cost outweighs ultra-low-power requirement and board space permits larger footprint. |
| MAX6315US21D3+T | Same 2.1V threshold and SOT23-5 package, but 1.25µA ICC and only 10ms/100ms timeout options (no D6 600ms). | Lacks long timeout needed for complex bootloader sequences; unsuitable for NAND/SD card initialization. | Choose only for simple 8-bit µP systems where fast reset release is preferred and battery life is secondary. |
Compared with TPS3837K21QDBVR and MAX6315US21D3+T, the MAX6855UK21D6+T uniquely combines sub-200nA supply current, 2.100V precision threshold, and 600–1200ms configurable timeout - making it the sole fit for long-life medical and portable devices requiring both accuracy and ultra-low quiescent power.
Availability
MAX6855UK21D6+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and handheld terminals requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6855UK21D6+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 was engineered specifically for ultra-low-power microprocessor supervision in battery-critical portable and medical electronics, emphasizing nanoscale ICC, wide VCC range, and robust reset timing control.
FAQ
What is the exact reset threshold voltage of MAX6855UK21D6+T?
The MAX6855UK21D6+T has a factory-trimmed reset threshold of 2.100V ±2.5%, specified over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix '21' corresponds to 2.100V nominal. The device asserts reset when VCC falls below this threshold and holds reset for ≥600ms after VCC rises above it. The MAX6855UK21D6+T maintains this accuracy without external calibration.
Does MAX6855UK21D6+T include a watchdog timer?
No, the MAX6855UK21D6+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input and watchdog timeout functionality. The MAX6855UK21D6+T belongs to the MAX6854/MAX6855/MAX6856 group, which provides voltage monitoring and manual reset only - confirmed by absence of WDI pin and watchdog-related electrical specs in its parameter tables.
What is the function of Pin 1 on MAX6855UK21D6+T?
Pin 1 of the MAX6855UK21D6+T is the RESET output, configured as an active-high push-pull driver. As stated in the MAX6854/MAX6855/MAX6856 Pin Description table, it transitions from low to high when VCC drops below 2.100V or MR is pulled low, and remains high for the full D6 timeout period (600–1200ms) after recovery. This eliminates need for external pullup resistors and directly interfaces with µP reset inputs expecting high-active logic.
Can MAX6855UK21D6+T operate with VCC = 1.2V?
Yes, the MAX6855UK21D6+T is fully specified to operate with VCC as low as 1.2V, per the Absolute Maximum Ratings and Electrical Characteristics tables. Its reset output remains valid down to VCC = +1.1V, and supply current is characterized at 1.2V (190nA typ). This enables reliable use in ultra-low-voltage systems such as energy-harvesting sensors or single-cell alkaline devices where regulated rails dip near 1.2V.
What is the minimum pulse width required on MR for MAX6855UK21D6+T?
The MAX6855UK21D6+T requires a minimum MR pulse width of 1µs to reliably assert reset, as specified in the Electrical Characteristics table under "MR Minimum Pulse Width (tMPW)". This short requirement allows compatibility with fast GPIO toggling and eliminates need for external debounce circuits. The internal 10kΩ pullup ensures MR floats high when unused, and the 200ns glitch rejection prevents false triggers from noise.
MAX6855UK21D6+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:
- 2.1V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK21D6+T FAQ
1.How can I place an order for MAX6855UK21D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK21D6+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 MAX6855UK21D6+T reliable?
The price and inventory of MAX6855UK21D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK21D6+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK21D6+T?
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4.How is shipping managed for MAX6855UK21D6+T?
MAX6855UK21D6+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK21D6+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 MAX6855UK21D6+T?
For technical support, including MAX6855UK21D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK21D6+T requirements.
6.How does Aetrix verify that MAX6855UK21D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK21D6+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 MAX6855UK21D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK21D6+T?
All MAX6855UK21D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK21D6+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 MAX6855UK21D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK21D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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