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Analog Devices Inc./Maxim Integrated MAX6855UK24D5+T
- Part No.:
- MAX6855UK24D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK24D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,404
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Product details
Overview
MAX6855UK24D5+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and factory-trimmed 2.4V reset threshold (±2.5%). It provides 450ms minimum reset timeout, ultra-low 170nA typical supply current at VCC = 1.8V, and guaranteed reset validity down to VCC = 1.1V. It is used in battery-powered medical monitors and portable electronics for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6855UK24D5+T datasheet, MAX6855UK24D5+T pinout, MAX6855UK24D5+T application, or MAX6855UK24D5+T equivalent, key selection criteria include reset threshold accuracy, timeout period stability over temperature, MR glitch rejection (200ns), open-drain/push-pull output compatibility, and immunity to sub-40µs VCC transients at 100mV overdrive.
Technical Context
The MAX6855UK24D5+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and a monolithic reset timeout generator. Its internal 10kΩ MR pullup enables direct connection to momentary switches without external components, and its reset assertion logic ensures deassertion only after both VCC exceeds 2.4V and MR is released, followed by the full 450ms timeout.
This variant belongs to the MAX6854–MAX6869 family with no watchdog timer or CT pin - it is a dedicated manual-reset supervisory IC with fixed 2.4V threshold and D5 (450ms) timeout. Its push-pull active-high RESET output drives directly into µP reset inputs requiring high-level assertion, eliminating need for external pullups or level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.4V ±2.5% (factory-trimmed); ensures reliable detection of 2.4V supply brownout before µP operation becomes unstable. |
| Reset Timeout Period | 450ms min (D5 option); guarantees µP remains held in reset long enough for power rails and clocks to stabilize post-brownout. |
| Supply Current | 170nA typ at VCC = 1.8V; enables multi-year battery life in glucose monitors and pagers with no duty-cycle trade-offs. |
| VCC Operating Range | 1.2V to 5.5V; supports single-cell Li-ion (3.0–4.2V), coin-cell (1.5–3.0V), and 3.3V/5V systems without external regulation. |
| Reset Validity Limit | Guaranteed to VCC = 1.1V; maintains valid active-high RESET signal even during deep brownout, preventing spurious release. |
| MR Glitch Rejection | 200ns; suppresses noise-induced false resets from ESD or switching transients on manual reset lines. |
| Output Type | Push-pull active-high RESET; sinks 500µA at VOH ≥ 0.8×VCC - compatible with standard CMOS µP reset inputs without pullup resistors. |
Pinout & Package
Package: 5-pin SOT23-5 (2.9mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; asserts high when VCC < 2.4V or MR is low; remains high for 450ms after recovery. |
| 2 | GND | Ground reference for all internal circuits and reset timing; must be connected to system ground plane. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic or open-drain signals. |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity in high-frequency layouts. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF ceramic bypass capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year shelf life in battery-backed medical devices. |
| No external components | Integrated MR pullup, precision voltage reference, and timeout oscillator eliminate BOM cost and layout area. |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents false resets in noisy automotive or industrial environments. |
| Guaranteed reset down to 1.1V | Ensures deterministic µP behavior during deep undervoltage events, critical for data integrity in patient monitors. |
| SOT23-5 footprint | Industry-standard 5-pin package enables drop-in replacement for TPS3837 and other supervisory ICs. |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) device powered by CR2032 coin cell, operating across -20°C to +50°C ambient. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to ARM Cortex-M0 during cold-start and battery sag below 2.4V. Use Value: 170nA ICC extends battery life beyond 2 years; 450ms timeout ensures ADC and RF subsystems fully initialize before firmware execution. |
Use Scenario: Portable ECG/SpO₂ logger with flash memory retention during intermittent power loss. IC Role / Device Role / Timing Role: Voltage monitor and reset controller holding microcontroller in known state during 100ms–500ms brownouts. Use Value: Guaranteed reset validity to VCC = 1.1V prevents partial writes to flash memory, preserving clinical data integrity. |
| Industrial Handheld Scanners | Smart Wearable Sensors |
|
Use Scenario: Rugged barcode scanner using LiPo battery and exposed to ESD and motor-switching noise. IC Role / Device Role / Timing Role: Brownout protector and MR interface for service-mode reset via physical button. Use Value: 200ns MR glitch rejection blocks ESD-induced false resets; dual-GND pins reduce ground bounce in noisy 3.3V systems. |
Use Scenario: Bluetooth-enabled temperature/humidity sensor worn on-body, powered by thin-film battery. IC Role / Device Role / Timing Role: Power-on supervisor ensuring clean boot sequence after battery insertion or wake-from-hibernate. Use Value: 2.4V threshold matches regulated 2.4V LDO output; 170nA ICC avoids measurable impact on 10µA sleep current budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K24DBVR | 2.4V threshold, 350ms timeout, 1.8–6V VCC range, 3.5µA ICC - 20× higher quiescent current than MAX6855UK24D5+T. | Acceptable in mains-powered or short-life battery designs; unsuitable for >1-year coin-cell applications. | Select when board space allows larger SOT-23-5 and higher ICC is acceptable for cost-sensitive consumer products. |
| ADM6805S24ARTZ-RL | 2.4V threshold, 200ms timeout, 1.2–5.5V VCC, 1.5µA ICC - lacks MR input and has shorter timeout. | Only suitable where manual reset is unnecessary and faster reset release is acceptable (e.g., non-critical peripherals). | Choose only if MR functionality is omitted from system design and 200ms timeout satisfies µP initialization requirements. |
Compared with TPS3837K24DBVR and ADM6805S24ARTZ-RL, the MAX6855UK24D5+T delivers 20× lower ICC and integrated MR support - making it the sole viable choice for long-life, manually resettable medical and portable equipment where power and reliability are co-constrained.
Availability
MAX6855UK24D5+T is available at Aetrix Electronics and suitable for glucose monitors, patient loggers, industrial scanners, and smart wearables requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK24D5+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 communications markets.
The MAX6854–MAX6869 product line was designed specifically for ultra-low-power microprocessor supervision in battery-critical applications - emphasizing nanoscale ICC, wide VCC range, and robust reset timing under transient conditions.
FAQ
What is the exact reset threshold voltage of the MAX6855UK24D5+T?
The MAX6855UK24D5+T has a factory-trimmed reset threshold of 2.4V with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "24" corresponds to VTH = 2.4V nominal. The MAX6855UK24D5+T maintains this specification without external calibration or trimming components.
Does the MAX6855UK24D5+T include a watchdog timer function?
No, the MAX6855UK24D5+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides only voltage monitoring and manual reset functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants (denoted by "S" or "L" suffixes in ordering code). The MAX6855UK24D5+T pinout and functional diagram confirm absence of WDI pin.
What is the meaning of "D5" in the MAX6855UK24D5+T part number?
"D5" specifies the reset timeout period option: 450ms minimum (typical 600ms, maximum 1200ms per Table 4). This timeout begins when VCC rises above 2.4V and MR is deasserted, and ensures the microprocessor remains held in reset long enough for power rails, clocks, and peripherals to stabilize. The MAX6855UK24D5+T uses this fixed timeout - no external capacitor or configuration pin adjusts it.
Can the MAX6855UK24D5+T operate with a 1.5V supply?
Yes, the MAX6855UK24D5+T operates down to VCC = 1.2V and guarantees valid reset assertion down to VCC = 1.1V. At 1.5V, it delivers 170nA typical supply current and maintains full functionality - including MR detection, reset timing accuracy, and push-pull output drive strength (VOH ≥ 0.8×VCC). This makes the MAX6855UK24D5+T suitable for single alkaline or silver-oxide battery systems.
Is the MAX6855UK24D5+T pin-compatible with other SOT23-5 supervisors?
Yes, the MAX6855UK24D5+T uses standard SOT23-5 pinout (Pin 1 = RESET, Pins 2&4 = GND, Pin 3 = MR, Pin 5 = VCC) and is explicitly noted as pin-compatible with TPS3836/TPS3837/TPS3838 in the datasheet Features section. Its dual-GND configuration enhances noise immunity versus single-GND alternatives, but PCB footprint and solder pad layout match industry-standard 5-pin SOT23.
MAX6855UK24D5+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:
- 2.4V
- 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
MAX6855UK24D5+T FAQ
1.How can I place an order for MAX6855UK24D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK24D5+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 MAX6855UK24D5+T reliable?
The price and inventory of MAX6855UK24D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK24D5+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK24D5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK24D5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK24D5+T?
MAX6855UK24D5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK24D5+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 MAX6855UK24D5+T?
For technical support, including MAX6855UK24D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK24D5+T requirements.
6.How does Aetrix verify that MAX6855UK24D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK24D5+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 MAX6855UK24D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK24D5+T?
All MAX6855UK24D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK24D5+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 MAX6855UK24D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK24D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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