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Analog Devices Inc./Maxim Integrated MAX6855UK31D3+T
- Part No.:
- MAX6855UK31D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK31D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,854
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Product details
Overview
The MAX6855UK31D3+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 3.075V reset threshold (suffix "31"), and 150ms minimum reset timeout (suffix "D3"). It provides active-high push-pull RESET output, manual reset input (MR), and voltage monitoring for brownout detection - used in battery-powered medical and portable electronics to ensure reliable µP initialization.
For engineers reviewing the MAX6855UK31D3+T datasheet, MAX6855UK31D3+T pinout, MAX6855UK31D3+T application, or MAX6855UK31D3+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), push-pull active-high output logic, and compatibility with low-voltage systems operating from 1.2V to 5.5V.
Technical Context
This device integrates a precision voltage monitor, manual reset latch, and internal reset timeout timer - no external components required. Its BiCMOS process enables stable operation across -40°C to +85°C while maintaining nanoscale quiescent current.
The MAX6855UK31D3+T asserts RESET high when VCC falls below 3.075V or MR is pulled low; RESET remains high for ≥150ms after VCC rises above threshold and MR deasserts. Internal 10kΩ MR pullup eliminates need for external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V systems without level-shifting |
| Reset Threshold Voltage | 3.075V (±2.5%) - factory-trimmed for precise brownout detection at nominal 3.3V rail |
| Reset Timeout Period | 150ms (min) - ensures µP completes power-up sequencing before release |
| Supply Current | 170nA (typ) at 2.5V - extends battery life in always-on portable devices |
| Reset Output Type | Push-pull active-high - drives high-impedance µP reset inputs directly, no pullup needed |
| Minimum Valid VCC | +1.1V - guarantees RESET assertion integrity during deep brownout conditions |
| VCC Transient Immunity | Immune to ≤40µs transients at 100mV overdrive - suppresses false resets in noisy environments |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - asserts high during reset; sinks/source capability defined per VCC and load |
| 2, 4 | GND | Ground reference - both pins must be connected to common system ground for noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 5 | VCC | Supply voltage input - monitors own power rail; 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 devices |
| No external components | Integrated reset timer, MR pullup, and voltage reference eliminate BOM cost and layout area |
| Guaranteed reset down to VCC = +1.1V | Ensures deterministic reset behavior even during severe undervoltage events |
| Immunity to short VCC transients | Rejects glitches ≤40µs duration at 100mV overdrive - critical for automotive/industrial EMI resilience |
| Push-pull active-high RESET | Direct interface to µP reset pins requiring high-active assertion; no external pullup resistor needed |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose sensing in wearable patch pumps with CR2032 coin-cell power. IC Role / Device Role / Timing Role: Supervises 3.3V analog front-end and BLE SoC power rails; asserts RESET high on brownout to prevent corrupted sensor calibration data. Use Value: 170nA ICC extends battery life beyond 12 months; 150ms timeout accommodates slow LDO startup in low-power mode. |
Use Scenario: Battery-backed ECG/SpO₂ recorder deployed in home healthcare settings. IC Role / Device Role / Timing Role: Monitors main 3.0V supply and triggers controlled shutdown/reset when voltage drops below 3.075V during battery depletion. Use Value: Guaranteed reset validity to 1.1V prevents undefined µP state during final battery discharge phase. |
| Industrial Handheld Scanners | Low-Power Wireless Sensor Nodes |
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion with intermittent high-current motor pulses. IC Role / Device Role / Timing Role: Detects VCC sags caused by motor commutation; holds µP in reset until rail stabilizes post-pulse. Use Value: 40µs transient immunity rejects motor-induced noise without false triggering. |
Use Scenario: Sub-GHz IoT node sleeping >99% of time, waking every 5 minutes for sensor read and RF transmit. IC Role / Device Role / Timing Role: Ensures clean reset on cold start after long storage; monitors 1.8V regulator output for wake-up integrity. Use Value: Factory-trimmed 3.075V threshold matches 3.3V LDO tolerance; 150ms timeout aligns with MCU boot ROM execution window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK31D3+T | Active-low push-pull RESET output; identical threshold (3.075V), timeout (150ms), and ICC (170nA) | Requires µP with active-low reset input; incompatible with active-high reset logic without inversion | Select when target µP uses active-low reset and board layout already accommodates pull-down or inverter path |
| TPS3836K33DBVR | 3.08V threshold, 200ms timeout, 1.2µA ICC - higher quiescent current, same SOT23-5 footprint | Higher ICC reduces battery life in multi-year deployments; suitable for mains-powered or frequently charged systems | Choose if legacy design uses TI-supplied firmware expecting TPS3836 timing, or where 1.2µA ICC is acceptable |
Compared with MAX6855UK31D3+T, the MAX6854UK31D3+T offers identical supervision accuracy and timing but inverted reset polarity - requiring signal-level redesign. The TPS3836K33DBVR trades 7× higher supply current for broader vendor support and longer production lifecycle, but sacrifices nanopower advantage in energy-constrained applications.
Availability
MAX6855UK31D3+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and low-power industrial sensors requiring stable component supply with full traceability and long-term continuity.
Supply support for MAX6855UK31D3+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 management, sensing, and connectivity in demanding environments.
The MAX6854–MAX6869 family delivers nanopower supervision for space- and energy-constrained systems - targeting portable healthcare, wearables, and remote IoT endpoints where µA-level leakage is unacceptable.
FAQ
What is the exact reset threshold voltage of the MAX6855UK31D3+T?
The MAX6855UK31D3+T has a factory-trimmed reset threshold voltage of 3.075V, 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 "31" corresponds to 3.075V nominal. The MAX6855UK31D3+T maintains this accuracy without external calibration.
Does the MAX6855UK31D3+T include a watchdog timer function?
No, the MAX6855UK31D3+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants integrate WDI functionality. The MAX6855UK31D3+T provides voltage monitoring, manual reset (MR), and fixed 150ms reset timeout - consistent with its designation as a non-watchdog member of the family.
What is the reset output configuration of the MAX6855UK31D3+T?
The MAX6855UK31D3+T features an active-high push-pull RESET output, as confirmed in the MAX6855/MAX6856 Pin Description table and Selector Guide. Pin 1 delivers a logic-high signal during reset assertion and returns low after timeout completion - eliminating need for external pullup resistors and enabling direct connection to µP reset inputs requiring high-active assertion.
Can the MAX6855UK31D3+T operate reliably below 1.8V?
Yes, the MAX6855UK31D3+T operates from 1.2V to 5.5V and guarantees valid reset assertion down to VCC = +1.1V. Electrical Characteristics confirm RESET output voltage (VOH) remains ≥0.8 × VCC at VCC ≥ 1.71V with 200µA source current, and the device maintains functional reset timing integrity across the full specified range - making it suitable for 1.2V, 1.5V, and 1.8V logic domains.
Is the MAX6855UK31D3+T pin-compatible with other devices in the MAX68xx family?
The MAX6855UK31D3+T shares the same 5-pin SOT23-5 package and pinout (VCC, MR, GND, GND, RESET) with MAX6854, MAX6856, MAX6858, and MAX6860–MAX6863 variants. However, pin compatibility does not imply functional equivalence - e.g., MAX6854 outputs active-low RESET, while MAX6855UK31D3+T outputs active-high. Swapping requires verification of reset polarity and timing alignment in the target system.
MAX6855UK31D3+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:
- 3.075V
- 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
MAX6855UK31D3+T FAQ
1.How can I place an order for MAX6855UK31D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK31D3+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 MAX6855UK31D3+T reliable?
The price and inventory of MAX6855UK31D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK31D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK31D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK31D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK31D3+T?
MAX6855UK31D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK31D3+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 MAX6855UK31D3+T?
For technical support, including MAX6855UK31D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK31D3+T requirements.
6.How does Aetrix verify that MAX6855UK31D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK31D3+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 MAX6855UK31D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK31D3+T?
All MAX6855UK31D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK31D3+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 MAX6855UK31D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK31D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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