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Analog Devices Inc./Maxim Integrated MAX6855UK35D6+T
- Part No.:
- MAX6855UK35D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK35D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,206
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Product details
Overview
The MAX6855UK35D6+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 a factory-trimmed 3.5V reset threshold (±2.5%). It delivers ultra-low 170nA typical supply current and guarantees valid reset assertion down to VCC = +1.1V. It is designed for reliable power-up/power-down monitoring in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK35D6+T datasheet, MAX6855UK35D6+T pinout, MAX6855UK35D6+T application, or MAX6855UK35D6+T equivalent, this page provides verified functional identity, exact reset timing behavior (600–1200ms timeout), MR interface logic levels, and confirmed compatibility with 1.2V–5.5V supply rails - all critical for low-power embedded system validation.
Technical Context
The MAX6855UK35D6+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and a fixed-reset-timeout generator. Its MR input features internal 10kΩ pullup, 1µs minimum pulse width, and 200ns glitch rejection - enabling robust manual reset initiation without external components.
Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6855UK35D6+T excludes WDI functionality and CT select input; it belongs to the core supervisory subset offering only VCC monitoring, MR, and push-pull active-high RESET. Its reset deassertion delay (tRD = 40µs) and guaranteed operation at VCC ≥ 1.1V support brownout resilience in deep-sleep systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.500V ±2.5% (factory-trimmed; ensures precise brownout detection at nominal 3.3V rail) |
| Supply Current (typ) | 170nA at VCC = 1.8V (enables multi-year battery life in glucose monitors and pagers) |
| Reset Timeout Period | 600–1200ms (D6 option; holds µP in reset long enough for full power stabilization) |
| Reset Output Type | Push-pull active-high (drives high to µP's active-high reset pin; no external pullup required) |
| Operating Voltage Range | 1.2V to 5.5V (supports single-cell Li-ion, 3.3V, and 5V systems without level-shifting) |
| Reset Valid Down To | VCC = +1.1V (guarantees deterministic reset state even during deep brownout) |
| MR Input Logic | Active-low, internally pulled up to VCC via 10kΩ (allows direct switch-to-GND connection; no external resistor needed) |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output driven high during reset assertion; sinks current when deasserted; referenced to VCC |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane |
| 3 | MR (manual reset) | Active-low input; initiates reset when pulled ≤0.3×VCC; internally pulled up to VCC (10kΩ) |
| 4 | NC / Not Connected | No internal connection; left floating per datasheet; not used in MAX6855 configuration |
| 5 | VCC | Primary supply input monitored for reset trigger; requires 0.1µF bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in always-on medical sensors |
| Immunity to VCC transients | Rejects <40µs glitches at 100mV overdrive - prevents spurious resets in noisy automotive/industrial environments |
| No external components | Integrated MR pullup, precision voltage reference, and timeout timer eliminate BOM cost and layout area |
| Guaranteed reset validity | RESET remains well-defined down to VCC = +1.1V - critical for low-voltage microcontrollers and energy-harvesting systems |
| CMOS-compatible MR interface | Accepts standard logic-low signals (≤0.3×VCC); supports direct connection to GPIO or momentary switches |
Applications
| Portable Glucose Monitors | PDA Power Sequencing |
|---|---|
|
Use Scenario: Continuous glucose sensing with intermittent wireless transmission and deep-sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V rail during wake-up from sub-1µA sleep; asserts active-high RESET until stable VCC and clock are established. Use Value: Prevents firmware crash during cold-start by enforcing ≥600ms reset hold time while LDO settles and RF oscillator stabilizes. |
Use Scenario: Multi-rail PDA with separate 1.8V core, 3.3V I/O, and 5V USB charging path. IC Role / Device Role / Timing Role: Monitors main 3.3V supply; triggers active-high RESET to ARM processor on undervoltage or user-initiated MR press. Use Value: Eliminates need for discrete RC reset network - reduces component count and improves timing repeatability across temperature (-40°C to +85°C). |
| Wireless Patient Monitors | Low-Power MP3 Players |
|
Use Scenario: Battery-powered ECG patch transmitting data via BLE every 30 seconds. IC Role / Device Role / Timing Role: Provides fail-safe reset during battery voltage sag below 3.5V; MR allows clinical staff to force reboot without opening enclosure. Use Value: 170nA ICC extends usable battery life by >18 months vs. legacy 5µA supervisors; 3.5V threshold matches LiPo discharge knee. |
Use Scenario: Flash-based audio player operating from single 3.7V Li-ion cell with buck-boost regulator. IC Role / Device Role / Timing Role: Asserts active-high RESET to DSP during regulator startup transient and low-battery shutdown. Use Value: Guaranteed reset validity to VCC = 1.1V ensures clean shutdown before flash corruption occurs at end-of-discharge. |
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 fixed threshold (not 3.5V); 200ms timeout (vs. 600–1200ms); 1.6V min VCC | Suitable for 3.3V-only systems requiring shorter reset hold; lacks VCC = 1.1V guarantee | Select if matching TI-based BOMs or needing tighter 3.3V tolerance; verify timeout sufficiency for your power rail settling time. |
| ADM6805-3ARTZ-RL7 | 3.08V threshold; open-drain active-low RESET; 240ms timeout; 1µA ICC | Requires external pullup; higher ICC reduces battery life; better for legacy µPs with active-low reset inputs | Choose only if interfacing to older microcontrollers requiring active-low reset and can tolerate 6× higher supply current. |
Compared with TPS3837K33DBVR and ADM6805-3ARTZ-RL7, the MAX6855UK35D6+T uniquely combines 3.5V precision threshold, ultra-low 170nA ICC, 600–1200ms configurable timeout, and guaranteed operation down to 1.1V - making it optimal for next-generation medical wearables where battery longevity and brownout resilience are non-negotiable.
Availability
MAX6855UK35D6+T is available at Aetrix Electronics and suitable for portable glucose monitors, wireless patient monitors, and low-power MP3 players requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK35D6+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 leader specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.
The MAX6854–MAX6869 family was engineered specifically for nanopower supervisory functions in battery-critical applications - delivering precision voltage monitoring, manual reset, and configurable timing in minimal 5-pin SOT23 packages.
FAQ
What is the exact reset threshold voltage of the MAX6855UK35D6+T?
The MAX6855UK35D6+T has a factory-trimmed reset threshold of 3.500V with ±2.5% tolerance (i.e., 3.413V to 3.588V). This value is defined in Table 2 of the datasheet under suffix "35" and is measured during VCC fall. The MAX6855UK35D6+T maintains this accuracy across -40°C to +85°C, with normalized VTH drift <±0.5% over temperature.
Does the MAX6855UK35D6+T include a watchdog timer function?
No, the MAX6855UK35D6+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides only VCC monitoring, manual reset (MR), and reset timeout - without WDI input or watchdog circuitry. Watchdog capability is exclusive to MAX6864–MAX6869 variants, as confirmed in the Selector Guide and Pin Descriptions.
What is the function of Pin 4 on the MAX6855UK35D6+T?
Pin 4 on the MAX6855UK35D6+T is unconnected (NC) - it has no internal bond wire and must be left floating. This is explicitly stated in the MAX6854/MAX6855/MAX6856 Pin Description table and confirmed in the SOT23 top-view diagram. Connecting Pin 4 may cause unpredictable behavior or damage.
Can the MAX6855UK35D6+T operate with a 1.2V supply?
Yes, the MAX6855UK35D6+T operates with VCC as low as 1.2V (absolute minimum rating is 1.2V per Electrical Characteristics table). Crucially, its RESET output remains valid down to VCC = +1.1V - meaning it can assert a clean active-high reset signal even during severe brownout conditions below its operational floor.
What is the reset timeout period for the MAX6855UK35D6+T?
Per the ordering code "D6", the MAX6855UK35D6+T has a minimum reset timeout period of 600ms, typical 900ms, and maximum 1200ms. This timeout begins after VCC rises above the 3.5V threshold and MR is deasserted, ensuring sufficient hold time for power rail stabilization and µP initialization before release.
MAX6855UK35D6+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:
- 3.5V
- 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
MAX6855UK35D6+T FAQ
1.How can I place an order for MAX6855UK35D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK35D6+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 MAX6855UK35D6+T reliable?
The price and inventory of MAX6855UK35D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK35D6+T is usually 5 days.
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Once your MAX6855UK35D6+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 MAX6855UK35D6+T?
For technical support, including MAX6855UK35D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK35D6+T requirements.
6.How does Aetrix verify that MAX6855UK35D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK35D6+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 MAX6855UK35D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK35D6+T?
All MAX6855UK35D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK35D6+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 MAX6855UK35D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK35D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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