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Analog Devices Inc./Maxim Integrated MAX6855UK17D5+T
- Part No.:
- MAX6855UK17D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK17D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,564
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Product details
Overview
MAX6855UK17D5+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, providing active-high push-pull reset output, manual reset input (MR), and factory-trimmed 1.665V reset threshold with 300ms minimum reset timeout. It monitors VCC supply integrity for brownout detection and asserts reset during power-up, power-down, or MR activation. Designed for ultra-low-power portable systems including glucose monitors and patient monitors.
For engineers reviewing the MAX6855UK17D5+T datasheet, MAX6855UK17D5+T pinout, MAX6855UK17D5+T application, or MAX6855UK17D5+T equivalent, key selection criteria include its 170nA typical supply current, guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients, and compatibility with battery-powered systems requiring stable low-voltage supervision.
Technical Context
The MAX6855UK17D5+T implements a precision voltage monitor with ±2.5% reset threshold accuracy over temperature, paired with a fixed 300ms minimum reset timeout (D5 option) and active-high push-pull RESET output referenced to VCC. Its MR input features internal 10kΩ pullup and 250ns MR-to-reset delay.
Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6855UK17D5+T lacks WDI functionality and CT select input - it belongs to the base supervisory group (MAX6854/MAX6855/MAX6856) with no watchdog timer or pin-selectable timeout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.665V (factory-trimmed, ±2.5% tolerance) - ensures reliable brownout detection at 1.665V nominal supply level |
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries |
| Reset Timeout | 300ms minimum (D5 option) - guarantees µP initialization completes before release |
| Operating Voltage | 1.2V to 5.5V - supports single-cell Li-ion, NiMH, and 3.3V/5V logic rails |
| Reset Validity | Guaranteed to VCC = +1.1V - maintains valid reset assertion during deep brownout |
| Output Type | Active-high push-pull RESET - drives high without external pullup; compatible with µP reset inputs requiring active-high assertion |
| MR Input | Active-low with 10kΩ internal pullup - simplifies manual reset implementation using momentary switch to GND |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (+T suffix), -40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault conditions; sinks current when deasserted |
| 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; driven low to force reset |
| 5 | VCC | Supply voltage input - monitored for reset threshold violation; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in always-on medical and portable devices |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C - eliminates need for external trimming in production |
| VCC transient immunity | Immune to ≤40µs 100mV VCC glitches - prevents false resets in noisy environments |
| No external components required | Self-contained supervision - only 0.1µF VCC bypass needed; no resistors or capacitors for timing |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = +1.1V - ensures robust behavior during deep undervoltage |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing in handheld or wearable devices powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Supervises 1.8V analog front-end and 3.3V MCU supply; asserts active-high RESET to halt firmware execution during brownout. Use Value: 170nA quiescent current enables >5-year battery life; 1.665V threshold aligns with low-voltage ADC reference stability requirements. | Use Scenario: Portable ECG or SpO₂ units operating from dual AA alkaline cells with declining voltage profile. IC Role / Device Role / Timing Role: Monitors main 3.0V rail; triggers 300ms reset pulse to ensure full MCU reinitialization after power recovery. Use Value: Guaranteed reset validity to 1.1V prevents latch-up during battery depletion; push-pull output eliminates external pullup component. |
| MP3 Players | PDAs |
Use Scenario: Flash-based audio players with Li-ion battery and dynamic voltage scaling. IC Role / Device Role / Timing Role: Resets audio DSP and NAND controller when VCC drops below 1.665V during discharge cycle. Use Value: D5 300ms timeout accommodates slow-start DC-DC converters; MR input allows user-initiated soft reset via button. | Use Scenario: Legacy PDA platforms with 3.3V I/O and 1.8V core, relying on long-term field reliability. IC Role / Device Role / Timing Role: Provides deterministic power-on reset sequence and manual reset path for diagnostics. Use Value: Pin-compatible replacement for TPS3837; eliminates layout changes while improving current efficiency by 3×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.3V fixed reset threshold; 200ms timeout; 1.2µA supply current | Higher current draw limits use in multi-year battery applications | Select when 3.3V rail supervision is required and ultra-low ICC is not critical |
| MAX6315US29D3+ | 2.93V threshold; 200ms timeout; 1.1µA supply current; open-drain output | Lacks active-high push-pull output and MR input; requires external pullup | Select for cost-sensitive designs where MR and push-pull are unnecessary |
Compared with TPS3837K33DBVR and MAX6315US29D3+, the MAX6855UK17D5+T delivers 6.5× lower supply current and a precisely trimmed 1.665V threshold ideal for sub-2V systems, while its active-high push-pull output reduces BOM count and improves noise margin in compact portable layouts.
Availability
MAX6855UK17D5+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and MP3 players requiring stable component supply with long-term lifecycle support and lead-free compliance.
Supply support for MAX6855UK17D5+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and portable applications.
The MAX685x family was designed specifically for nanopower microprocessor supervision in battery-critical systems, emphasizing ultra-low ICC, guaranteed low-VCC reset validity, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK17D5+T?
The MAX6855UK17D5+T has a factory-trimmed reset threshold of 1.665V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "17" corresponds to 1.665V nominal. The MAX6855UK17D5+T maintains this accuracy without external calibration or trimming components.
Does the MAX6855UK17D5+T include a watchdog timer function?
No, the MAX6855UK17D5+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides only voltage monitoring and manual reset (MR) functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK16D3S). The MAX6855UK17D5+T pinout and functional diagram confirm absence of WDI terminal.
What does the "D5" in MAX6855UK17D5+T indicate?
The "D5" suffix in MAX6855UK17D5+T specifies the reset timeout period: 300ms minimum (with typical 450ms and maximum 600ms values per Table 4). This timeout begins after VCC rises above the 1.665V threshold and MR is deasserted, ensuring sufficient hold time for microprocessor initialization before release. D5 is one of six fixed timeout options available across the MAX685x family.
Is the MAX6855UK17D5+T pin-compatible with other MAX685x devices?
Yes, the MAX6855UK17D5+T shares the same 5-pin SOT23-5 package and pinout as all MAX6854/MAX6855/MAX6856 variants: Pin 1 = RESET (active-high push-pull), Pins 2 & 4 = GND, Pin 3 = MR, Pin 5 = VCC. However, it is not pin-compatible with MAX6861–MAX6869 (which use Pin 1 for CT) or MAX6864–MAX6869 (which use Pin 1 for WDI).
What is the maximum VCC voltage the MAX6855UK17D5+T can monitor?
The MAX6855UK17D5+T supports a supply voltage range of 1.2V to 5.5V, meaning it can monitor VCC rails up to 5.5V. Absolute maximum rating is +6.0V on VCC, but operational specification guarantees performance only within 1.2V–5.5V. For 5V systems, the 1.665V threshold remains valid, and the device draws only 170nA typical current - making it suitable for mixed-voltage supervision without level-shifting.
MAX6855UK17D5+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:
- 1.665V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK17D5+T FAQ
1.How can I place an order for MAX6855UK17D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK17D5+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 MAX6855UK17D5+T reliable?
The price and inventory of MAX6855UK17D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK17D5+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK17D5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK17D5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK17D5+T?
MAX6855UK17D5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK17D5+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 MAX6855UK17D5+T?
For technical support, including MAX6855UK17D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK17D5+T requirements.
6.How does Aetrix verify that MAX6855UK17D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK17D5+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 MAX6855UK17D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK17D5+T?
All MAX6855UK17D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK17D5+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 MAX6855UK17D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK17D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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