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Analog Devices Inc./Maxim Integrated MAX6855UK28D6+T
- Part No.:
- MAX6855UK28D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK28D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,649
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Product details
Overview
The MAX6855UK28D6+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 2.800V reset threshold (suffix "28"), and 600ms–1200ms minimum reset timeout (suffix "D6"). It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C - used for reliable power-on reset and brownout protection in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK28D6+T datasheet, MAX6855UK28D6+T pinout, MAX6855UK28D6+T application, or MAX6855UK28D6+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 µP systems requiring minimal quiescent current.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and timing-controlled reset deassertion into a single monolithic BiCMOS IC. Its internal reset timeout generator ensures deterministic reset pulse width after VCC recovery or MR release, independent of external components.
The MAX6855UK28D6+T uses a precision bandgap reference and comparator to monitor VCC against a ±2.5% accurate 2.800V threshold, with 0.5% hysteresis. Its MR input features 10kΩ internal pullup, 1µs minimum pulse width support, and 200ns glitch rejection - enabling robust reset initiation in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.800V ±2.5% - precisely holds µP in reset until VCC stabilizes above nominal supply rail for stable boot. |
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries in always-on patient monitors. |
| Reset Timeout | 600–1200ms min - ensures sufficient time for µP clock stabilization and peripheral initialization before release. |
| Operating Voltage | 1.2V to 5.5V - supports direct integration with 1.8V, 2.5V, 3.3V, and 5V logic domains without level-shifting. |
| Reset Validity | Guaranteed to VCC = +1.1V - maintains valid active-high RESET signal during deep brownout, preventing undefined µP state. |
| Output Type | Push-pull active-high - drives RESET high without external pullup; sinks 500µA at VOH ≥ 0.8×VCC for direct µP reset pin interface. |
| Temperature Range | -40°C to +85°C - qualified for industrial and portable medical equipment operating in uncontrolled ambient conditions. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm height - optimized for space-constrained portable designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault/brownout; deasserts low after timeout; no external pullup required. |
| 2 | GND | Ground reference - must be connected to system ground plane for accurate voltage monitoring and noise immunity. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS-level signals; initiates reset when pulled low. |
| 4 | GND | Second ground terminal - improves thermal dissipation and reduces ground impedance in high-noise layouts. |
| 5 | VCC | Supply voltage input - monitored for reset assertion; requires 0.1µF ceramic bypass capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in glucose meters and wearable health sensors beyond 5 years. |
| VCC transient immunity | Rejects <40µs VCC glitches at 100mV overdrive - prevents spurious resets in electrically noisy handheld devices. |
| Reset validity to 1.1V | Guaranteed RESET functionality down to VCC = +1.1V - ensures deterministic µP behavior during deep undervoltage events. |
| No external components | Self-contained supervision - eliminates BOM cost and PCB area for RC timing networks or pullup resistors. |
| Factory-trimmed accuracy | ±2.5% reset threshold tolerance - removes need for calibration or trimming in production test, reducing manufacturing overhead. |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission in disposable patch form factor. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM Cortex-M0+ MCU during battery insertion and low-VCC brownout. Use Value: 170nA ICC enables >7-year shelf life on CR2032; 2.800V threshold matches LiMnO₂ primary cell discharge profile. |
Use Scenario: Portable ECG/SpO₂ recorder with 72-hour battery runtime and auto-power-off on idle. IC Role / Device Role / Timing Role: Power-on reset generator and brownout detector interfacing directly to MSP430FR5994 µP reset pin. Use Value: Guaranteed RESET validity to 1.1V prevents MCU latch-up during partial battery depletion; 600ms timeout allows full ADC calibration sequence. |
| Industrial Handheld Scanners | Low-Power Wireless Sensors |
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion with cold-temperature operation requirement. IC Role / Device Role / Timing Role: Voltage supervisor ensuring clean µP reset across -20°C to +60°C ambient, including during USB hot-plug events. Use Value: -40°C to +85°C rating covers extended industrial range; MR input enables hardware-triggered factory reset via front-panel button. |
Use Scenario: LoRaWAN soil moisture node deployed in remote agricultural fields with 10-year battery target. IC Role / Device Role / Timing Role: Nanopower reset controller holding nRF52840 in reset until LDO output reaches 3.0V, then releasing after 1200ms stabilization delay. Use Value: D6 timeout option (600–1200ms) accommodates slow-ramping energy-harvesting power supplies; 1.2V min VCC supports ultra-low-power buck converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K28QDBVR | 2.8V threshold, 200ms fixed timeout, open-drain active-low output, 1.5µA ICC | Requires external pullup; higher ICC limits use in >5-year battery applications; lacks MR input | Select when board already uses open-drain reset architecture and timeout budget permits shorter duration. |
| MAX6369KA28+T | 2.8V threshold, 140ms timeout, push-pull active-low, 1.2µA ICC, no MR input | Lower ICC than TPS3837 but still 7× higher than MAX6855; active-low logic incompatible without inverter | Choose only if active-low reset polarity is mandatory and MR functionality is unnecessary. |
Compared with TPS3837K28QDBVR and MAX6369KA28+T, the MAX6855UK28D6+T uniquely combines ultra-low 170nA current, active-high push-pull output, integrated MR input, and long 600–1200ms timeout - making it the sole fit for multi-year, MR-enabled, low-voltage medical devices requiring zero external components.
Availability
MAX6855UK28D6+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6855UK28D6+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 MAX6855UK28D6+T belongs to the MAX68xx nanopower supervisory family, designed specifically for battery-critical applications where µP reliability must be maintained over multi-year deployments with minimal quiescent power draw.
FAQ
What is the exact reset threshold voltage of the MAX6855UK28D6+T?
The MAX6855UK28D6+T has a factory-trimmed reset threshold of 2.800V, with ±2.5% accuracy over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "28" corresponds to 2.800V nominal. The MAX6855UK28D6+T maintains this precision without external calibration, ensuring consistent power-on behavior across production units.
Does the MAX6855UK28D6+T include a watchdog timer function?
No, the MAX6855UK28D6+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input and watchdog timeout capability. The MAX6855UK28D6+T is a manual-reset-only supervisory circuit with VCC monitoring and reset timing - confirmed by absence of WDI pin and watchdog-related electrical characteristics in its specification tables.
What is the meaning of the "D6" suffix in MAX6855UK28D6+T?
The "D6" suffix in MAX6855UK28D6+T specifies the reset timeout period: D6 corresponds to a minimum reset timeout of 600ms, with typical 900ms and maximum 1200ms (Table 4). This timeout begins when VCC rises above the 2.800V threshold or MR is released, and ensures the µP remains held in reset long enough for clock stabilization and memory initialization before execution resumes.
Can the MAX6855UK28D6+T operate with a 1.5V supply?
Yes, the MAX6855UK28D6+T operates down to VCC = +1.2V per Absolute Maximum Ratings and Electrical Characteristics tables. At 1.5V, it guarantees RESET validity and monitors VCC against the 2.800V threshold - however, since 1.5V < 2.800V, the device will assert RESET continuously. It is intended for use with supplies ≥2.8V; operation below threshold serves only brownout detection, not functional supervision.
Is the MAX6855UK28D6+T pin-compatible with other MAX68xx devices?
The MAX6855UK28D6+T shares the same 5-pin SOT23-5 pinout as MAX6854, MAX6856, MAX6861–MAX6863, and MAX6864–MAX6869 variants - all use Pin 1=RESET, Pin 2=GND, Pin 3=MR, Pin 4=GND, Pin 5=VCC. However, output polarity differs: MAX6855UK28D6+T provides active-high push-pull RESET (Pin 1), while MAX6854/MAX6856 offer active-low variants - direct replacement requires verifying µP reset pin polarity compatibility.
MAX6855UK28D6+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:
- 2.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK28D6+T FAQ
1.How can I place an order for MAX6855UK28D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK28D6+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 MAX6855UK28D6+T reliable?
The price and inventory of MAX6855UK28D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK28D6+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK28D6+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK28D6+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK28D6+T?
MAX6855UK28D6+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK28D6+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 MAX6855UK28D6+T?
For technical support, including MAX6855UK28D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK28D6+T requirements.
6.How does Aetrix verify that MAX6855UK28D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK28D6+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 MAX6855UK28D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK28D6+T?
All MAX6855UK28D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK28D6+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 MAX6855UK28D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK28D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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