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Analog Devices Inc./Maxim Integrated MAX6855UK35D3+T
- Part No.:
- MAX6855UK35D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK35D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,314
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Product details
Overview
The MAX6855UK35D3+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 3.5V reset threshold (±2.5%), and 150ms minimum reset timeout period. It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C - designed for reliable power-up/brownout monitoring in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK35D3+T datasheet, MAX6855UK35D3+T pinout, MAX6855UK35D3+T application, or MAX6855UK35D3+T equivalent, key selection criteria include its guaranteed RESET validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), MR glitch rejection (200ns), and compatibility with CMOS-level manual reset sources without external pullup.
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 hold time after VCC recovery or MR release, independent of external components.
The active-high push-pull RESET output is referenced to VCC and guarantees VOH ≥ 0.8×VCC (ISOURCE = 500µA) and VOL ≤ 0.3V (ISINK = 1.2mA), enabling direct interfacing with µP reset inputs requiring high-true logic. MR features an internal 10kΩ pullup and accepts CMOS-compatible low-voltage assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries without compromising reset reliability. |
| Reset Threshold Voltage | 3.500V ±2.5% (VTH = +3.5V) - factory-trimmed for precise brownout detection at nominal 3.3V system rails. |
| Reset Timeout Period | 150ms minimum (D3 option) - ensures µP completes power stabilization and internal initialization before release. |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and supports direct connection to µP nRESET pins. |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input systems including Li-ion, alkaline, and regulated 1.8V/2.5V/3.3V/5V rails. |
| RESET Validity Limit | Guaranteed to VCC = +1.1V - maintains valid logic state during deep brownout, preventing spurious release. |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies manual reset implementation using momentary switch to GND. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during reset assertion; requires no external pullup; sinks/source capability defined per electrical specs. |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return for all internal circuitry. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); asserts reset when pulled ≤0.3×VCC for ≥1µs. |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity and thermal dissipation. |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF ceramic capacitor to GND for noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in glucose monitors and wearables beyond 5 years on CR2032. |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C - eliminates need for system-level calibration in portable medical devices. |
| Transient immunity | Immune to VCC glitches <40µs at 100mV overdrive - prevents false resets in noisy automotive or industrial environments. |
| No external components | Self-contained supervision - removes BOM cost and layout area for RC networks or discrete comparators. |
| Guaranteed RESET down to 1.1V | Valid logic state maintained during deep undervoltage - ensures deterministic µP behavior even during catastrophic rail collapse. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power MCU sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V rail during battery discharge and wake-from-sleep transitions; asserts RESET if VCC drops below 3.5V threshold. Use Value: Prevents corrupted sensor readings or failed BLE handshakes by ensuring MCU only resumes operation after stable power restoration. |
Use Scenario: Portable ECG and SpO₂ units powered by rechargeable Li-ion cells with dynamic load profiles. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and triggers 150ms reset hold to allow analog front-end settling and ADC calibration post-power-up. Use Value: Eliminates startup artifacts and baseline drift by guaranteeing clean µP initialization before signal acquisition begins. |
| MP3 Players | Smart Pagers |
Use Scenario: Flash-based audio players with dual-voltage logic (1.8V core, 3.3V I/O) and mechanical button interface. IC Role / Device Role / Timing Role: Provides active-high RESET to 3.3V I/O domain; MR pin wired to power-on button for user-initiated hard reset. Use Value: Enables one-button recovery from firmware lockups without removing batteries or opening enclosure. |
Use Scenario: Two-way pagers with intermittent RF transmission, EEPROM logging, and long standby duration. IC Role / Device Role / Timing Role: Supervises 3.3V supply during RF burst transmission; uses 150ms timeout to accommodate transient voltage sag without false reset. Use Value: Maintains message integrity and clock synchronization by avoiding unintended resets during high-current TX events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.08V fixed threshold (±1.5%), 200ms timeout, open-drain RESET, 1.6µA ICC | Lacks MR input; requires external pullup; higher supply current limits battery lifetime | Choose only if 3.08V threshold matches system rail and open-drain interface is required. |
| MAX6315US35D3+ | 3.5V threshold (±2.0%), 140ms timeout, push-pull active-low RESET, 1.2µA ICC | Active-low output incompatible with µPs requiring high-true reset; higher ICC reduces battery runtime | Select only for legacy designs using active-low reset architecture and where 1.2µA ICC is acceptable. |
Compared with TPS3837K33DBVR and MAX6315US35D3+, the MAX6855UK35D3+T delivers superior energy efficiency (170nA vs >1µA), guaranteed 1.1V RESET validity, integrated MR with internal pullup, and active-high push-pull output - making it optimal for next-generation ultra-low-power medical and portable electronics.
Availability
MAX6855UK35D3+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, and smart pagers requiring stable component supply with long-term lifecycle support and traceable sourcing.
Supply support for MAX6855UK35D3+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 precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX685x family was designed specifically for nanopower microprocessor supervision in battery-critical portable equipment - emphasizing ultra-low ICC, wide VCC range, and robust reset timing under transient conditions.
FAQ
What is the exact reset threshold voltage of the MAX6855UK35D3+T?
The MAX6855UK35D3+T has a factory-trimmed reset threshold of 3.500V with ±2.5% tolerance 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 '35' corresponds to VTH = 3.500V. The MAX6855UK35D3+T maintains this accuracy without external calibration or trimming components.
Does the MAX6855UK35D3+T include a watchdog timer function?
No, the MAX6855UK35D3+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 MAX6855UK35D3+T provides voltage monitoring, manual reset (MR), and fixed reset timeout - but no watchdog circuitry.
What is the function of Pin 1 and Pin 4 on the MAX6855UK35D3+T?
On the MAX6855UK35D3+T, Pin 1 is the active-high push-pull RESET output, and Pin 4 is a second ground (GND) terminal - electrically tied to Pin 2. This dual-GND configuration improves noise immunity and thermal performance in compact PCB layouts. The MAX6855UK35D3+T pinout is explicitly shown in the "MAX6854/MAX6855/MAX6856 Pin Description" section of the datasheet.
Can the MAX6855UK35D3+T operate reliably below 1.8V supply voltage?
Yes, the MAX6855UK35D3+T operates from VCC = 1.2V to 5.5V and guarantees valid RESET output down to VCC = +1.1V. Electrical Characteristics confirm supply voltage range (MIN = 1.2V, TYP = 2.5V, MAX = 5.5V), and the "RESET Valid to VCC = +1.1V" feature ensures deterministic behavior during deep brownout - critical for low-voltage battery systems.
Is the MAX6855UK35D3+T pin-compatible with other devices in the MAX685x family?
The MAX6855UK35D3+T shares the same 5-pin SOT23-5 package and pinout as MAX6854 and MAX6856 variants, but differs in RESET polarity: MAX6855UK35D3+T uses active-high push-pull (Pin 1), while MAX6854 uses active-low push-pull and MAX6856 uses active-low open-drain. Direct substitution requires verification of RESET polarity and output drive requirements in the target design.
MAX6855UK35D3+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:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK35D3+T FAQ
1.How can I place an order for MAX6855UK35D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK35D3+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 MAX6855UK35D3+T reliable?
The price and inventory of MAX6855UK35D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK35D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK35D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK35D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK35D3+T?
MAX6855UK35D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK35D3+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 MAX6855UK35D3+T?
For technical support, including MAX6855UK35D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK35D3+T requirements.
6.How does Aetrix verify that MAX6855UK35D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK35D3+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 MAX6855UK35D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK35D3+T?
All MAX6855UK35D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK35D3+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 MAX6855UK35D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK35D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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