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Analog Devices Inc./Maxim Integrated MAX6855UK24D6+T
- Part No.:
- MAX6855UK24D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK24D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,460
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Product details
Overview
The MAX6855UK24D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and active-low push-pull reset output. It asserts reset when VCC drops below its factory-trimmed 2.400V threshold, when MR is pulled low, or during power-up/brownout - with guaranteed reset validity down to VCC = +1.1V and a 600ms minimum timeout period. It targets ultra-low-power portable systems such as glucose monitors and battery-powered PDAs.
For engineers reviewing the MAX6855UK24D6+T datasheet, MAX6855UK24D6+T pinout, MAX6855UK24D6+T application, or MAX6855UK24D6+T equivalent, key selection criteria include its 170nA typical supply current, 2.400V ±2.5% reset threshold, 600–1200ms reset timeout range, immunity to short VCC transients (<40µs at 100mV overdrive), and compatibility with 1.2V–5.5V supply rails.
Technical Context
This device integrates a precision voltage monitor with hysteresis (0.5% of VTH), a monolithic reset timeout generator, and an internally pulled-up manual reset input (10kΩ). Its push-pull active-high RESET output is referenced to VCC and delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V) and VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V).
No external components are required. The circuit operates across –40°C to +85°C and maintains functional reset assertion down to VCC = +1.1V - critical for brownout detection in Li-ion or coin-cell powered systems where supply collapse must be reliably captured before logic failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation on coin cells without compromising supervision reliability. |
| Reset Threshold Voltage | 2.400V ±2.5% - factory-trimmed for precise brownout detection at 2.4V rail; supports 1.575V–4.625V variants via suffix. |
| Reset Timeout Period | 600ms (min), 900ms (typ), 1200ms (max) - ensures µP completes full initialization before release from reset. |
| VCC Operating Range | 1.2V to 5.5V - compatible with 1.8V, 2.5V, 3.3V, and 5V logic domains and mixed-voltage systems. |
| Reset Output Type | Push-pull active-high - eliminates need for external pullup; drives high to VCC with rail-to-rail VOH ≥ 0.8×VCC. |
| MR Input Behavior | Active-low, internally pulled up to VCC (10kΩ); accepts CMOS levels; 1µs minimum pulse width; 250ns MR-to-reset delay. |
| Guaranteed Reset Validity | Down to VCC = +1.1V - ensures deterministic reset assertion even during deep brownout conditions. |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (+T suffix), footprint-compatible with industry-standard 5-pin SOT23 layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - transitions high when VCC falls below 2.400V or MR is asserted; remains high for full timeout after recovery. |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return for all internal functions. |
| 3 | MR | Active-low manual reset input - initiates reset when pulled low; internally pulled up to VCC (10kΩ); no external pullup needed. |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity and thermal dissipation in high-density layouts. |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF capacitor to GND for noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in portable medical and wearables beyond 5 years on CR2032. |
| Reset threshold accuracy | ±2.5% over –40°C to +85°C - eliminates need for external trimming or calibration in production test. |
| Transient immunity | Immune to VCC glitches <40µs at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments. |
| No external components | Self-contained supervision - reduces BOM count, PCB area, and qualification effort versus discrete RC-based solutions. |
| Wide VCC range | Operates from 1.2V to 5.5V - supports single-supply designs across 1.8V microcontrollers and legacy 5V peripherals. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Battery-powered handheld glucose meter operating from a single 3V coin cell with intermittent sensor activation. IC Role / Device Role / Timing Role: Supervises 3V rail integrity and provides clean, glitch-immune reset to ARM Cortex-M0 MCU during cold start and low-battery brownout. Use Value: 170nA ICC extends usable battery life to >3 years; 2.400V threshold matches nominal 3V supply sag profile; 600ms timeout accommodates slow analog sensor wake-up. |
Use Scenario: Portable ECG patch with Bluetooth LE connectivity, powered by rechargeable LiPo and requiring fail-safe boot sequencing. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and asserts reset if voltage dips below 2.400V during RF transmission bursts or battery discharge. Use Value: Guaranteed reset validity to VCC = +1.1V ensures deterministic behavior during deep discharge; push-pull RESET avoids pullup resistor in space-constrained flex PCB layout. |
| MP3 Players | Smart Pagers |
|
Use Scenario: Flash-based audio player using 1.8V SoC and dual-voltage display, powered by 3.7V Li-ion with buck converter. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for 1.8V core domain, triggered by 2.400V monitored rail derived from converter output. Use Value: 1.2V–5.5V operating range allows direct monitoring of post-regulator rail; 250ns MR-to-reset delay enables fast hardware-initiated recovery from frozen UI states. |
Use Scenario: Two-way pager with real-time OS, low-power sleep mode, and periodic network polling - powered by AA alkaline cells. IC Role / Device Role / Timing Role: Supervises 3V main rail and generates reliable reset during battery swap or voltage sag caused by RF transmit pulses. Use Value: Immunity to <40µs transients prevents false resets during GSM burst transmission; 600ms timeout ensures full bootloader execution before application launch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | Fixed 3.08V reset threshold; 200ms timeout; 1.6µA ICC (10× higher than MAX6855UK24D6+T) | Higher supply current limits battery life in multi-year devices; lacks 2.4V option and transient immunity spec | Select only if 3.08V threshold aligns with system rail and µA-level ICC suffices. |
| ADM6805-24ARTZ-RL | 2.40V threshold; 200ms timeout; 1.5µA ICC; open-drain output requires pullup | Shorter timeout may not satisfy bootloader timing; open-drain adds component and layout overhead | Prefer only when open-drain interface is mandatory and timeout margin is verified. |
Compared with TPS3836K33DBVR and ADM6805-24ARTZ-RL, the MAX6855UK24D6+T delivers 10× lower ICC, guaranteed reset validity to 1.1V, and superior transient immunity - making it the optimal choice for long-life, low-voltage, and noise-sensitive portable medical and consumer electronics.
Availability
MAX6855UK24D6+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, and smart pagers requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6855UK24D6+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 applications.
The MAX6854–MAX6869 family was designed specifically for ultra-low-power microprocessor supervision in battery-critical portable equipment - emphasizing nanoscale ICC, wide VCC range, and robust reset timing under brownout and noise stress.
FAQ
What is the exact reset threshold voltage of the MAX6855UK24D6+T?
The MAX6855UK24D6+T has a factory-trimmed reset threshold voltage of 2.400V, with a tolerance of ±2.5% 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 "24" corresponds to 2.400V nominal. The device guarantees reset assertion when VCC falls below this threshold and deassertion only after VCC exceeds it plus hysteresis (0.5% of VTH).
Does the MAX6855UK24D6+T include a watchdog timer function?
No, the MAX6855UK24D6+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 functionality. The MAX6855UK24D6+T belongs to the MAX6854/MAX6855/MAX6856 group, which provides voltage monitoring and manual reset only - confirmed by its pinout (no WDI pin) and absence of watchdog-related electrical specs in its parameter tables.
What is the reset timeout period for the MAX6855UK24D6+T?
The MAX6855UK24D6+T has a minimum reset timeout period of 600ms, with typical and maximum values of 900ms and 1200ms respectively. This is defined by the "D6" suffix in the part number and verified in Table 4 (Reset Timeout Periods), where D6 maps to 600/900/1200ms. The timeout begins after VCC rises above the 2.400V threshold and MR is deasserted, ensuring sufficient hold time for microcontroller initialization.
Is the MAX6855UK24D6+T pin-compatible with other supervisory ICs?
The MAX6855UK24D6+T uses a standard 5-pin SOT23-5 package with Pin 1 = RESET (active-high push-pull), Pins 2 & 4 = GND, Pin 3 = MR, and Pin 5 = VCC. It is explicitly noted as pin-compatible with TPS3836/TPS3837/TPS3838 devices per the Features section - but only for the MAX6861/MAX6862/MAX6863 variants. For MAX6855, pin compatibility is structural (same footprint), not functional - RESET polarity and MR behavior match TPS3836K33DBVR only if configured for active-high output.
What is the supply current specification for the MAX6855UK24D6+T at 1.8V?
At VCC = 1.8V and TA = +25°C, the MAX6855UK24D6+T draws 170nA typical supply current (ICC), as specified in the Electrical Characteristics table under "Supply Current" with condition VCC = 1.8V. This ultra-low ICC is maintained across –40°C to +85°C and is critical for multi-year battery operation - confirmed by Typical Operating Characteristics plot "ICC vs. Temperature" showing <220nA across the full range when RESET is not asserted.
MAX6855UK24D6+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:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK24D6+T FAQ
1.How can I place an order for MAX6855UK24D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK24D6+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 MAX6855UK24D6+T reliable?
The price and inventory of MAX6855UK24D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK24D6+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK24D6+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK24D6+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK24D6+T?
MAX6855UK24D6+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK24D6+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 MAX6855UK24D6+T?
For technical support, including MAX6855UK24D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK24D6+T requirements.
6.How does Aetrix verify that MAX6855UK24D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK24D6+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 MAX6855UK24D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK24D6+T?
All MAX6855UK24D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK24D6+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 MAX6855UK24D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK24D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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