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Analog Devices Inc./Maxim Integrated MAX6855UK17D1+T
- Part No.:
- MAX6855UK17D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK17D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,699
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Product details
Overview
The MAX6855UK17D1+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.665V reset threshold (suffix D1), and 10ms minimum reset timeout period. It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C for reliable power-up/brownout monitoring in battery-critical systems.
For engineers reviewing the MAX6855UK17D1+T datasheet, MAX6855UK17D1+T pinout, MAX6855UK17D1+T application, or MAX6855UK17D1+T equivalent, this device serves as a low-quiescent-current voltage monitor with deterministic reset timing, MR-initiated recovery, and guaranteed RESET validity down to VCC = +1.1V - key for portable medical and handheld electronics design validation.
Technical Context
The MAX6855UK17D1+T implements a precision bandgap-based voltage detector with ±2.5% reset threshold accuracy over temperature, coupled with a fixed 10ms reset timeout timer. Its active-high push-pull RESET output is referenced to VCC and sinks up to 1.2mA at VCC ≥ 2.38V while maintaining VOL ≤ 0.3V.
It includes an internally pulled-up MR input (10kΩ to VCC) with 1µs minimum pulse width support and 250ns MR-to-reset delay. Immunity to short VCC transients is ensured via built-in glitch rejection, with no external components required for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V; enables multi-year battery life in always-on monitoring applications. |
| Reset Threshold | 1.665V (factory-trimmed, ±2.5%); matches 1.8V I/O rail brownout detection with hysteresis of 0.5% VTH. |
| Reset Timeout | 10ms minimum (D1 option); ensures µP reset assertion long enough for full core initialization before release. |
| RESET Output Type | Active-high push-pull; eliminates need for external pullup and supports direct interface to CMOS inputs. |
| VCC Operating Range | 1.2V to 5.5V; valid RESET assertion guaranteed down to VCC = 1.1V for fail-safe behavior during deep undervoltage. |
| MR Input Logic | Active-low with internal 10kΩ pullup to VCC; accepts CMOS-level signals and requires no external biasing. |
| Temperature Range | -40°C to +85°C; qualified for industrial and portable medical equipment deployment. |
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 reset output; drives high when VCC ≥ 1.665V and MR is deasserted, remains high for 10ms after valid conditions are met. |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); asserts RESET when pulled ≤ 0.3×VCC. |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity in noisy PCB layouts. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF ceramic bypass capacitor to GND for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell-powered glucose monitors. |
| Guaranteed RESET down to VCC = 1.1V | Ensures deterministic reset assertion even during severe brownout, preventing undefined µP states. |
| No external components required | Reduces BOM count and PCB area; eliminates calibration drift and component tolerance dependencies. |
| Immunity to short VCC transients | Rejects <40µs glitches at 100mV overdrive, avoiding spurious resets in electrically noisy environments. |
| MR glitch rejection | 200ns filtering prevents false resets from ESD or switching noise on manual reset lines. |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 1.8V analog front-end and BLE SoC power rails; asserts active-high RESET to hold system in known state until stable VCC ≥ 1.665V. Use Value: 170nA quiescent current extends battery life beyond 2 years; 10ms timeout ensures ADC and radio initialization completes before firmware execution. |
Use Scenario: Wearable ECG patch recording heart rate and SpO₂ for 72-hour clinical studies. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output powering MCU and sensor interface; triggers reset on battery sag below 1.665V during peak transmit bursts. Use Value: Guaranteed RESET validity to VCC = 1.1V prevents data corruption during rapid discharge; MR allows clinician-initiated recalibration without power cycle. |
| Industrial Handheld Scanners | Low-Power Wireless Sensors |
|
Use Scenario: Rugged barcode scanner using AA batteries and cold-cranking in warehouse freezers (-20°C). IC Role / Device Role / Timing Role: Detects 1.8V logic rail collapse during motor-induced voltage dip; holds MCU in reset until rail recovers and stabilizes for 10ms. Use Value: ±2.5% threshold accuracy over -40°C to +85°C ensures consistent trip point across operating range; dual-GND pins reduce ground bounce in high-current switching environments. |
Use Scenario: Soil moisture node transmitting LoRaWAN packets every 15 minutes using alkaline AA cells. IC Role / Device Role / Timing Role: Supervises buck converter output feeding ultra-low-power MCU; asserts RESET if input voltage drops below 1.665V during cold start or aging battery discharge. Use Value: No external components simplify conformal coating and IP67 sealing; 250ns MR-to-reset delay enables fast hardware-triggered diagnostics mode entry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | Fixed 3.08V reset threshold; 200nA ICC; open-drain RESET output requiring external pullup. | Lacks MR input; not suitable where manual reset initiation is required. | Select only if system uses 3.3V rail monitoring and can accommodate open-drain interface. |
| MAX6361KA29D3+T | 1.625V threshold (±1.5%); 1.2µA ICC; 150ms reset timeout; same SOT23-5 package. | Higher supply current reduces battery lifetime; longer timeout may delay system recovery unnecessarily. | Choose only if tighter threshold tolerance is critical and 10ms timeout is insufficient for target µP startup sequence. |
Compared with TPS3837K33DBVR and MAX6361KA29D3+T, the MAX6855UK17D1+T uniquely combines ultra-low 170nA current, 1.665V precision threshold, active-high push-pull output, and MR support in one 5-pin SOT23 - enabling compact, long-life designs where manual reset and minimal BOM are mandatory.
Availability
MAX6855UK17D1+T is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld scanners, and low-power wireless sensors requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6855UK17D1+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 interface applications in industrial, medical, and communications markets.
The MAX6855UK17D1+T belongs to the nanopower µP supervisory family engineered specifically for battery-constrained portable electronics, delivering ultra-low ICC, factory-trimmed thresholds, and robust reset timing without external components.
FAQ
What is the exact reset threshold voltage of the MAX6855UK17D1+T?
The MAX6855UK17D1+T has a factory-trimmed reset threshold of 1.665V (typical), with ±2.5% tolerance over -40°C to +85°C. This value is defined by the "17" suffix per Maxim's Threshold Suffix Guide (Table 2), and is validated across voltage and temperature per the Electrical Characteristics table. The MAX6855UK17D1+T guarantees RESET assertion when VCC falls below this threshold and maintains it for the full 10ms timeout after recovery.
Does the MAX6855UK17D1+T include a watchdog timer function?
No, the MAX6855UK17D1+T does not include a watchdog timer. It is part of the MAX6854/MAX6855/MAX6856 series, which provide voltage monitoring and manual reset only. Watchdog functionality is reserved for MAX6864–MAX6869 variants (e.g., MAX6864UK16D3S). The MAX6855UK17D1+T pinout lacks WDI, and its functional diagram confirms absence of watchdog circuitry.
What is the RESET output configuration of the MAX6855UK17D1+T?
The MAX6855UK17D1+T features an active-high push-pull RESET output (Pin 1), as confirmed by its Selector Guide entry and Pin Description table. Unlike open-drain versions, it sources current when asserted and requires no external pullup resistor. VOH is guaranteed ≥ 0.8×VCC at ISOURCE = 500µA, making it directly compatible with standard CMOS inputs.
Can the MAX6855UK17D1+T operate with supply voltages below 1.8V?
Yes, the MAX6855UK17D1+T operates from VCC = 1.2V to 5.5V and guarantees valid RESET assertion down to VCC = 1.1V. At 1.2V supply, ICC is 190nA (typ), and RESET remains functional with VOL ≤ 0.3V at ISINK = 100µA. This makes the MAX6855UK17D1+T suitable for single-cell LiFePO₄ or NiMH systems where rail voltage decays below 1.8V.
Is the MR input of the MAX6855UK17D1+T internally pulled up?
Yes, the MR input (Pin 3) of the MAX6855UK17D1+T includes an internal 10kΩ pullup resistor to VCC, as documented in the Pin Description and Applications Information sections. This allows MR to be left unconnected when unused, or driven low via a momentary switch to GND without external biasing. MR accepts CMOS logic levels and rejects glitches shorter than 200ns.
MAX6855UK17D1+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:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK17D1+T FAQ
1.How can I place an order for MAX6855UK17D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK17D1+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 MAX6855UK17D1+T reliable?
The price and inventory of MAX6855UK17D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK17D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK17D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK17D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK17D1+T?
MAX6855UK17D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK17D1+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 MAX6855UK17D1+T?
For technical support, including MAX6855UK17D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK17D1+T requirements.
6.How does Aetrix verify that MAX6855UK17D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK17D1+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 MAX6855UK17D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK17D1+T?
All MAX6855UK17D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK17D1+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 MAX6855UK17D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK17D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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