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Analog Devices Inc./Maxim Integrated MAX6855UK22D3+T
- Part No.:
- MAX6855UK22D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK22D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,035
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Product details
Overview
The MAX6855UK22D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 2.235V reset threshold (suffix '22'), and a 150ms minimum reset timeout (suffix 'D3'). It provides active-high push-pull RESET output, manual reset input (MR), and operates across –40°C to +85°C for battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK22D3+T datasheet, MAX6855UK22D3+T pinout, MAX6855UK22D3+T application, or MAX6855UK22D3+T equivalent, this page delivers verified electrical parameters, functional pin mapping, real-world use cases in glucose monitors and PDAs, and validated alternative parts with documented differences in reset polarity and timeout options.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and reset timing control-without watchdog or CT functionality-making it a dedicated VCC supervisor for deterministic power-up sequencing. Its active-high push-pull RESET output ensures direct compatibility with µP reset inputs requiring high-asserted initialization, and guaranteed reset validity down to VCC = 1.1V supports brownout resilience.
The MAX6855UK22D3+T uses internal trimming to fix its 2.235V reset threshold with ±2.5% tolerance over temperature, and its 150ms minimum reset timeout (D3 option) is factory-set-not user-selectable-ensuring consistent system boot hold time without external components or configuration pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C; enables multi-year operation on coin-cell batteries in portable medical devices. |
| Reset Threshold | 2.235V (±2.5%); precisely matches 2.2V–2.3V rail supervision for low-power µPs and ADCs. |
| Reset Timeout | 150ms minimum; holds reset long enough for slow-ramping supplies and oscillator stabilization. |
| Operating Voltage | 1.2V to 5.5V; supports supervision of sub-1.8V logic rails and legacy 3.3V/5V systems. |
| Reset Output Type | Active-high push-pull; eliminates need for external pullup and drives µP reset directly. |
| Reset Validity | Guaranteed to VCC = +1.1V; ensures reliable reset assertion during deep brownout conditions. |
| MR Input Logic | Active-low with 10kΩ internal pullup; accepts CMOS-level signals and momentary switch closure to GND. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint-compatible with industry-standard 5-pin supervisory ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; asserts high during reset, deasserts low after timeout; referenced to VCC. |
| 2, 4 | GND | Ground reference for all internal circuits; must be connected to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; initiates reset when pulled ≤0.3×VCC. |
| 5 | VCC | Supply voltage input and monitored rail; 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 glucose monitors using CR2032 cells. |
| No external components | Factory-trimmed threshold and fixed timeout eliminate resistors, capacitors, or configuration jumpers. |
| Immunity to short transients | Rejects VCC glitches ≤40µs at 100mV overdrive, preventing spurious resets in noisy portable environments. |
| Guaranteed reset down to 1.1V | Ensures µP remains held in reset until supply stabilizes above functional logic threshold. |
| SOT23-5 footprint | Enables drop-in replacement in space-constrained designs where board area is <10mm² per IC. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Portable handheld glucose meters powered by single CR2032 coin cell with intermittent usage over 2+ years. IC Role / Device Role / Timing Role: Supervises 2.2V analog front-end and µP supply; asserts active-high RESET during cold start and brownout. Use Value: 170nA ICC extends battery life beyond 24 months; 150ms timeout ensures ADC reference and sensor bias settle before µP release. |
Use Scenario: Battery-backed bedside patient monitor with dual-supply architecture (1.8V logic, 3.3V analog). IC Role / Device Role / Timing Role: Monitors primary 2.2V µP rail; generates clean, glitch-immune reset pulse on power-up and fault recovery. Use Value: Guaranteed reset validity to 1.1V prevents erratic behavior during partial discharge; push-pull output drives reset net without pullup resistor. |
| PDAs | MP3 Players |
Use Scenario: Legacy PDA with ARM7-based SoC and Li-ion battery with aging-induced voltage sag. IC Role / Device Role / Timing Role: Acts as primary VCC supervisor for 2.2V core rail; MR pin enables hardware reset button integration. Use Value: 2.235V threshold aligns with SoC's minimum operating voltage; MR debounce handled internally-no RC network needed. |
Use Scenario: Flash-based MP3 player with burst-mode audio decoding and variable load current causing supply droop. IC Role / Device Role / Timing Role: Detects VCC dip below 2.235V during high-current decode bursts and asserts RESET for 150ms. Use Value: Immunity to ≤40µs transients avoids false resets during normal playback; SOT23-5 fits tight PCB layouts near battery connector. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK22D3+T | Active-low open-drain RESET output; requires external pullup resistor; same 2.235V threshold and 150ms timeout. | Suitable where µP reset input is active-low and system already includes pullup; not compatible with active-high-only reset nets. | Select if existing design uses open-drain topology or needs level-shifting capability via external pullup. |
| TPS3837K22DBVR | 2.2V threshold, 200ms timeout, active-low push-pull RESET; 1.5µA ICC (vs. 170nA); same SOT23-5 package. | Higher supply current limits battery life in ultra-low-power applications; no MR input-only VCC monitoring. | Choose only for cost-sensitive, non-battery-critical industrial controls where 10× higher ICC is acceptable. |
Compared with MAX6855UK22D3+T, the MAX6854UK22D3+T offers identical supervision specs but requires external biasing, while the TPS3837K22DBVR trades nanopower efficiency for lower unit cost and omits manual reset-making both unsuitable as drop-in replacements without schematic or firmware revision.
Availability
MAX6855UK22D3+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and portable PDAs requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6855UK22D3+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 consumer systems.
The MAX685x family targets ultra-low-power microprocessor supervision in battery-operated equipment, emphasizing nanoscale ICC, factory-trimmed accuracy, and minimal external component count for rapid, reliable system boot.
FAQ
What is the exact reset threshold voltage of the MAX6855UK22D3+T?
The MAX6855UK22D3+T has a factory-trimmed reset threshold of 2.235V, 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 '22' corresponds to 2.235V nominal. The MAX6855UK22D3+T maintains this specification without calibration or external adjustment.
Does the MAX6855UK22D3+T include a watchdog timer function?
No, the MAX6855UK22D3+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 logic. The MAX6855UK22D3+T is a dedicated VCC supervisor with manual reset (MR) and fixed reset timeout-no watchdog-related pins or timing parameters apply.
What is the function of Pin 1 on the MAX6855UK22D3+T?
Pin 1 of the MAX6855UK22D3+T is the RESET output terminal, configured as an active-high push-pull driver. When asserted, it outputs a logic high (≈VCC); when deasserted, it outputs a logic low (≤0.3V). This differs from MAX6854 (open-drain) and MAX6856 (open-drain) variants, and is explicitly defined in the MAX6855-specific Pin Description table on page 6 of the datasheet.
Can the reset timeout period of the MAX6855UK22D3+T be changed externally?
No, the reset timeout period of the MAX6855UK22D3+T is fixed at 150ms minimum (suffix 'D3') and cannot be modified externally. Unlike MAX6861–MAX6863 variants with CT pin selectability, the MAX6855UK22D3+T has no configuration pin or resistor/capacitor interface for timeout adjustment-the D3 option is factory-programmed and immutable in-circuit.
Is the MAX6855UK22D3+T RoHS-compliant and lead-free?
Yes, the MAX6855UK22D3+T is lead-free and RoHS-compliant. The '+T' suffix explicitly denotes lead-free packaging per Maxim's ordering conventions (stated in the Ordering Information section). It meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
MAX6855UK22D3+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:
- 2.188V
- 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
MAX6855UK22D3+T FAQ
1.How can I place an order for MAX6855UK22D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK22D3+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 MAX6855UK22D3+T reliable?
The price and inventory of MAX6855UK22D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK22D3+T is usually 5 days.
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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 MAX6855UK22D3+T?
For technical support, including MAX6855UK22D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK22D3+T requirements.
6.How does Aetrix verify that MAX6855UK22D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK22D3+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 MAX6855UK22D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK22D3+T?
All MAX6855UK22D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK22D3+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 MAX6855UK22D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK22D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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