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Analog Devices Inc./Maxim Integrated MAX6855UK16D3+T
- Part No.:
- MAX6855UK16D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK16D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,292
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Product details
Overview
The MAX6855UK16D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and factory-trimmed 1.575V reset threshold. It asserts reset during VCC brownout, manual trigger, or watchdog timeout (not applicable to this variant), with guaranteed reset validity down to VCC = +1.1V and ultra-low 170nA typical supply current. It is used in battery-powered medical monitors and portable electronics requiring reliable power-on reset and low-quiescent-current supervision.
For engineers reviewing the MAX6855UK16D3+T datasheet, MAX6855UK16D3+T pinout, MAX6855UK16D3+T application, or MAX6855UK16D3+T equivalent, key selection criteria include its 1.575V reset threshold, 150ms minimum reset timeout, active-high push-pull RESET output, MR input with internal 10kΩ pullup, and operation across –40°C to +85°C.
Technical Context
This device implements a precision voltage monitor with hysteresis (0.5% of VTH) and a fixed 150ms reset timeout timer. Its reset assertion logic combines VCC monitoring (with guaranteed validity to 1.1V) and asynchronous manual reset via MR - both triggering the same internal timeout counter before deassertion.
The MAX6855UK16D3+T lacks watchdog timer (WDI) and CT select inputs, distinguishing it from MAX686x variants. Its push-pull active-high RESET output is referenced to VCC and delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA, enabling direct interfacing with µP reset inputs without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V (factory-trimmed, ±2.5%), enabling precise brownout detection for 1.8V/2.5V systems |
| Reset Timeout | 150ms (min), ensuring µP initialization completes before release from reset |
| Supply Current | 170nA (typ) at VCC = 1.8V, supporting multi-year battery life in portable devices |
| Operating Range | –40°C to +85°C, qualified for industrial and medical portable equipment |
| RESET Output Type | Active-high push-pull, eliminating need for external pullup and ensuring fast, rail-to-rail logic levels |
| VCC Validity Limit | Reset remains valid down to VCC = +1.1V, guaranteeing deterministic behavior during deep brownout |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC, allowing direct switch-to-GND connection without external components |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high when VCC ≥ 1.575V and MR is high; sinks/source capability defined per VOH/VOL specs |
| 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); <1µs pulse width sufficient to trigger reset |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity and thermal dissipation |
| 5 | VCC | Supply and monitored voltage input; powers device and serves as reset threshold reference; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell–powered glucose monitors |
| No external components | Integrated MR pullup, precision voltage reference, and timeout oscillator eliminate BOM cost and layout area |
| Immunity to VCC transients | Rejects ≤40µs transients at 100mV overdrive, preventing false resets in noisy power environments |
| Guaranteed reset at low VCC | Valid RESET output asserted down to VCC = +1.1V ensures robustness during deep undervoltage conditions |
| SOT23-5 footprint | Industry-standard 5-pin package enables drop-in replacement and compatibility with automated assembly |
Applications
| Portable Medical Devices | Battery-Powered PDAs |
|---|---|
Use Scenario: Glucose meters and patient monitors powered by single CR2032 coin cells operating intermittently over multi-year lifetimes. IC Role / Device Role / Timing Role: Supervises VCC during power-up and brownout; provides clean, timed reset pulse to MCU after battery insertion or voltage recovery. Use Value: 170nA quiescent current extends battery life beyond 5 years; 1.575V threshold matches nominal 1.8V LDO output; 150ms timeout accommodates slow-start regulators. |
Use Scenario: Handheld PDAs with flash memory boot and real-time clock backup, requiring deterministic reset sequencing after wake-from-sleep. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and asserts active-high RESET to ARM Cortex-M0 during power transitions. Use Value: Push-pull output eliminates external pullup resistor; guaranteed reset validity to 1.1V prevents latch-up during partial discharge; MR allows user-initiated soft reset. |
| MP3 Players | Low-Power Sensor Nodes |
Use Scenario: Flash-based audio players using Li-ion batteries with dynamic voltage scaling (2.8V–4.2V range). IC Role / Device Role / Timing Role: Detects VCC crossing 1.575V during charge/discharge cycles and triggers MCU reset to prevent corrupted firmware execution. Use Value: Factory-trimmed threshold ensures consistent trip point across temperature; 150ms timeout exceeds NAND flash initialization time; no external RC network required. |
Use Scenario: Wireless environmental sensor nodes powered by energy harvesters with highly variable VCC (1.2V–2.5V). IC Role / Device Role / Timing Role: Provides fail-safe reset when harvested voltage dips below operational minimum, ensuring MCU reboots cleanly on recovery. Use Value: Operation down to 1.2V VCC and reset validity to 1.1V enable use with ultra-low-voltage boost converters; MR supports remote reset via GPIO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK16D3+T | Active-low push-pull RESET output; identical reset threshold (1.575V), timeout (150ms), and ICC (170nA) | Requires inverted reset logic on µP side; suitable where host design uses active-low reset input | Select when µP reset pin is active-low and board layout already accommodates push-pull drive |
| TPS3836K33DBVR | 1.6V reset threshold (±0.5%), 200ms timeout, 1.2µA ICC (typ), SOT23-5, no MR input | Lacks manual reset; higher supply current reduces battery lifetime in ultra-low-power applications | Choose only if MR functionality is unnecessary and 1.6V vs. 1.575V threshold tolerance is acceptable |
Compared with MAX6854UK16D3+T and TPS3836K33DBVR, the MAX6855UK16D3+T uniquely offers active-high push-pull RESET with MR support and nanopower consumption - making it optimal for battery-critical designs requiring user-reset capability and minimal component count.
Availability
MAX6855UK16D3+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered PDAs, and MP3 players requiring stable component supply with long-term lifecycle assurance.
Supply support for MAX6855UK16D3+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, with emphasis on low-power, high-reliability solutions.
The MAX685x family targets ultra-low-power microprocessor supervision in space-constrained, battery-operated systems - delivering nanopower operation, factory-trimmed accuracy, and integrated reset timing without external components.
FAQ
What is the reset threshold voltage of the MAX6855UK16D3+T?
The MAX6855UK16D3+T has a factory-trimmed reset threshold of +1.575V, with ±2.5% tolerance over temperature (–40°C to +85°C). This value is encoded in the "16" suffix per Maxim's Threshold Suffix Guide and is guaranteed to remain stable across its full operating range, enabling reliable brownout detection in 1.8V systems.
Does the MAX6855UK16D3+T include a watchdog timer?
No, the MAX6855UK16D3+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 series, which provide only voltage monitoring and manual reset functions. Watchdog capability is exclusive to MAX6864–MAX6869 variants, identifiable by "S" or "L" suffixes in the part number.
What is the function of Pin 1 on the MAX6855UK16D3+T?
Pin 1 of the MAX6855UK16D3+T is the RESET output, configured as an active-high push-pull driver. It transitions high when VCC rises above 1.575V and MR is deasserted, remaining high for the full 150ms reset timeout period before releasing the µP from reset - eliminating need for external pullup resistors.
Can the MAX6855UK16D3+T operate with VCC below 1.8V?
Yes, the MAX6855UK16D3+T operates with VCC as low as +1.2V and guarantees valid reset output down to +1.1V. Its 170nA typical supply current and functional reset assertion at sub-1.8V make it suitable for ultra-low-voltage systems such as energy-harvesting sensor nodes and coin-cell–powered wearables.
How is the reset timeout period set on the MAX6855UK16D3+T?
The reset timeout period of the MAX6855UK16D3+T is fixed at 150ms (minimum), encoded by the "D3" suffix in the part number per Maxim's Reset Timeout Period Table. Unlike MAX6861–MAX6863 variants, it has no CT pin - the timeout is factory-programmed and non-adjustable in-circuit.
MAX6855UK16D3+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:
- 1.575V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK16D3+T FAQ
1.How can I place an order for MAX6855UK16D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK16D3+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 MAX6855UK16D3+T reliable?
The price and inventory of MAX6855UK16D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK16D3+T is usually 5 days.
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MAX6855UK16D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK16D3+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 MAX6855UK16D3+T?
For technical support, including MAX6855UK16D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK16D3+T requirements.
6.How does Aetrix verify that MAX6855UK16D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK16D3+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 MAX6855UK16D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK16D3+T?
All MAX6855UK16D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK16D3+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 MAX6855UK16D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK16D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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