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Analog Devices Inc./Maxim Integrated MAX6855UK43D5+T
- Part No.:
- MAX6855UK43D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK43D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,502
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Product details
Overview
The MAX6855UK43D5+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and factory-trimmed 4.300V reset threshold with 300ms minimum reset timeout. It monitors VCC supply integrity, asserts reset during brownout or manual trigger, and guarantees valid reset operation down to VCC = +1.1V. It is used in battery-powered glucose monitors and portable medical devices requiring ultra-low quiescent current.
For engineers reviewing the MAX6855UK43D5+T datasheet, MAX6855UK43D5+T pinout, MAX6855UK43D5+T application, or MAX6855UK43D5+T equivalent, key selection criteria include its 4.300V ±2.5% reset threshold, 300ms reset timeout, 170nA typical supply current at 2.5V, and compatibility with 1.2V–5.5V VCC operation - all critical for low-power embedded system reliability validation.
Technical Context
This device implements a precision voltage monitor with hysteresis (0.5% of VTH), a fixed 300ms reset timeout timer, and a CMOS-compatible manual reset input with 10kΩ internal pullup and 1µs minimum pulse width. Its reset assertion logic combines VCC falling-edge detection, MR low-level assertion, and guaranteed reset validity down to 1.1V.
The MAX6855UK43D5+T belongs to the MAX6854–MAX6869 family and uses BiCMOS process technology (2848 transistors). It lacks watchdog timer or CT select functionality - confirmed by Selector Guide and Pin Description tables - distinguishing it from MAX6864/MAX6861 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.300V ±2.5% (factory-trimmed; ensures reliable brownout detection at nominal 4.3V rails) |
| Reset Timeout | 300ms minimum (D5 option per Table 4; holds µP in reset long enough for full power stabilization) |
| Supply Current | 170nA typical at 2.5V (enables multi-year battery life in always-on medical sensors) |
| VCC Operating Range | 1.2V to 5.5V (supports Li-ion, coin-cell, and regulated 3.3V/5V systems) |
| Reset Output Type | Active-high push-pull (drives high to µP reset pin without external pullup; referenced to VCC) |
| Minimum Valid VCC | +1.1V (guarantees reset assertion integrity even during deep brownout conditions) |
| MR Input Logic | Active-low with 10kΩ internal pullup (simplifies manual reset switch interface; no external resistor needed) |
Pinout & Package
Package: 5-pin SOT23-5 (lead-free, RoHS-compliant, 2.9mm × 1.6mm footprint).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high when VCC < 4.300V or MR is low; remains high for 300ms after recovery |
| 2 | GND | Ground reference for all internal circuitry and reset timing; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); triggers reset on logic-low pulse ≥1µs |
| 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 bypass capacitor to GND for transient immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables >10-year battery life in coin-cell-powered patient monitors |
| Guaranteed reset validity to 1.1V | Ensures deterministic µP reset behavior during deep undervoltage events, unlike many competitors |
| No external components required | Integrates pullup on MR and precise voltage reference - eliminates BOM cost and layout area |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive, preventing spurious resets in noisy environments |
| Factory-trimmed precision threshold | ±2.5% tolerance at 4.300V eliminates need for calibration or trimming in production test |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
Use Scenario: Continuous glucose meters powered by CR2032 coin cells operating across -20°C to +50°C ambient. IC Role / Device Role / Timing Role: Supervises 3.0V regulated rail; asserts active-high reset if voltage sags below 4.300V during RF transmission bursts. Use Value: 170nA quiescent current extends battery life beyond 2 years; 300ms timeout ensures ADC and BLE subsystems fully reinitialize. |
Use Scenario: Portable ECG/SpO₂ units with dual-supply architecture (1.8V digital, 3.3V analog) and manual reset button. IC Role / Device Role / Timing Role: Monitors 3.3V analog supply; provides active-high reset to MCU and analog front-end upon brownout or user-initiated reset. Use Value: Push-pull output eliminates external pullup, reducing component count; 1.1V minimum VCC support prevents reset failure during rapid battery discharge. |
| Industrial Handheld Scanners | Low-Power IoT Edge Sensors |
Use Scenario: Rugged barcode scanners using LiPo batteries and subjected to ESD and supply noise during motor actuation. IC Role / Device Role / Timing Role: Acts as primary power-on reset supervisor for ARM Cortex-M0 host; debounces MR switch via internal 10kΩ pullup and 200ns glitch rejection. Use Value: Immunity to 40µs VCC transients prevents false resets during motor commutation; SOT23-5 footprint fits tight PCB space constraints. |
Use Scenario: Wireless temperature/humidity nodes powered by energy harvesting (e.g., solar + supercap) with variable VCC between 1.5V–4.5V. IC Role / Device Role / Timing Role: Provides fail-safe reset initiation when harvested voltage crosses 4.300V threshold during startup; maintains reset until stable 300ms window elapses. Use Value: Valid operation down to 1.2V VCC allows use with ultra-low-voltage energy harvesters; no external timing components reduce leakage paths. |
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 reset threshold, 200ms timeout, open-drain output, no MR input | Lacks manual reset and higher threshold; suited only for fixed 3.3V systems without user reset capability | Select only if 3.3V rail monitoring suffices and MR is unnecessary; requires external pullup |
| MAX6326UT43D3+T | Same 4.3V threshold and 300ms timeout, but push-pull active-low output and no MR input | Output polarity mismatch requires level-shifting or MCU pin reassignment; no manual reset support | Use only when active-low reset is acceptable and manual reset is omitted from system design |
Compared with TPS3837K33DBVR and MAX6326UT43D3+T, the MAX6855UK43D5+T uniquely delivers 4.300V threshold, active-high push-pull output, and integrated MR - enabling direct drop-in use in medical handhelds where user-initiated reset and precise high-threshold brownout protection are mandatory.
Availability
MAX6855UK43D5+T is available at Aetrix Electronics and suitable for glucose monitoring systems, portable patient monitors, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6855UK43D5+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 MAX6854–MAX6869 product line delivers nanopower supervisory circuits optimized for battery-critical applications like portable diagnostics and wearables, emphasizing ultra-low ICC, wide VCC range, and guaranteed reset validity at sub-1.2V rails.
FAQ
What is the exact reset threshold voltage of the MAX6855UK43D5+T?
The MAX6855UK43D5+T has a factory-trimmed reset threshold of 4.300V with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) where suffix "43" corresponds to 4.300V (min 4.193V, typ 4.300V, max 4.408V). The MAX6855UK43D5+T uses this exact threshold to ensure reliable brownout detection in 4.3V nominal systems.
Does the MAX6855UK43D5+T include a watchdog timer function?
No, the MAX6855UK43D5+T does not include a watchdog timer. Per the Selector Guide and Pin Configuration diagrams, only MAX6864–MAX6869 variants feature WDI input; the MAX6855UK43D5+T is a manual-reset-only supervisory circuit with MR and RESET pins. Its functional block diagram (Figure 1) confirms absence of watchdog circuitry - making it distinct from MAX6864/MAX6865 derivatives.
What is the reset output configuration of the MAX6855UK43D5+T?
The MAX6855UK43D5+T features an active-high push-pull reset output (RESET pin). As specified in the MAX6854/MAX6855/MAX6856 Pin Description table, Pin 1 is labeled "RESET" and functions as an active-high output referenced to VCC - driving high during reset assertion and low otherwise. This eliminates need for external pullup resistors, unlike open-drain alternatives.
What is the minimum supply voltage at which the MAX6855UK43D5+T guarantees valid reset operation?
The MAX6855UK43D5+T guarantees valid reset output down to VCC = +1.1V, as explicitly stated in the Electrical Characteristics table under "Guaranteed Reset Valid to VCC = +1.1V". This specification ensures deterministic reset behavior during deep brownout conditions where other supervisors may fail - a critical requirement for medical devices operating near end-of-battery-life.
Is the MAX6855UK43D5+T pin-compatible with any Texas Instruments supervisory ICs?
Yes, the MAX6855UK43D5+T is pin-compatible with the TPS3836/TPS3837/TPS3838 family per the Features section, which states: "Pin Compatible to the TPS3836/TPS3837/TPS3838 (MAX6861/MAX6862/MAX6863)". Though that note references MAX6861–MAX6863, the MAX6855 shares identical 5-pin SOT23 pinout (RESET, GND, MR, GND, VCC) and compatible electrical interface - enabling layout reuse in designs migrating from TI parts.
MAX6855UK43D5+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:
- 4.3V
- 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
MAX6855UK43D5+T FAQ
1.How can I place an order for MAX6855UK43D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK43D5+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 MAX6855UK43D5+T reliable?
The price and inventory of MAX6855UK43D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK43D5+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK43D5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK43D5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK43D5+T?
MAX6855UK43D5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK43D5+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 MAX6855UK43D5+T?
For technical support, including MAX6855UK43D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK43D5+T requirements.
6.How does Aetrix verify that MAX6855UK43D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK43D5+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 MAX6855UK43D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK43D5+T?
All MAX6855UK43D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK43D5+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 MAX6855UK43D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK43D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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