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Analog Devices Inc./Maxim Integrated MAX6855UK24D2+T
- Part No.:
- MAX6855UK24D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK24D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,927
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Product details
Overview
The MAX6855UK24D2+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 2.4V reset threshold (±2.5%), and 40ms minimum reset timeout period. It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C - used for reliable power-on reset and brownout protection in battery-powered medical sensors.
For engineers reviewing the MAX6855UK24D2+T datasheet, MAX6855UK24D2+T pinout, MAX6855UK24D2+T application, or MAX6855UK24D2+T equivalent, key selection criteria include its 2.4V VTH tolerance, guaranteed RESET validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, and compatibility with CMOS-level MR signaling without external pullup.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and reset timing control into a single die. Its internal comparator monitors VCC against a precision bandgap-derived 2.4V threshold, triggering an active-high push-pull RESET output that remains asserted for ≥40ms after VCC exceeds VTH and MR deasserts.
The MR input features 10kΩ internal pullup, 0.3×VCC/0.7×VCC logic thresholds, 1µs minimum pulse width support, and 200ns glitch rejection - enabling direct interface with momentary switches or CMOS outputs without debounce circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VTH) | 2.4V ±2.5% - factory-trimmed for accurate brownout detection at nominal 2.4V rail |
| Reset Timeout (tRP) | 40ms min - ensures µP reset hold time meets boot initialization requirements |
| Supply Current (ICC) | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries |
| VCC Validity Range | 1.1V to 5.5V - RESET remains functional even during deep brownout conditions |
| MR Input Logic | Active-low, 0.3×VCC/0.7×VCC thresholds - compatible with standard CMOS I/O |
| RESET Output Type | Push-pull active-high - eliminates need for external pullup resistor |
| VCC Transient Immunity | No reset for ≤40µs transients at 100mV overdrive - suppresses noise-induced false resets |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high when VCC < VTH or MR low; no external pullup needed |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold reference |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 4 | GND | Second ground terminal - improves noise immunity; connect to same ground as Pin 2 |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical - extends battery life in portable glucose monitors and patient telemetry devices |
| Guaranteed RESET at VCC = 1.1V | Ensures deterministic reset behavior during deep undervoltage events before µP lockup |
| No external components required | Integrates pullup on MR, precision VTH reference, and timing capacitor - reduces BOM count and PCB area |
| Immunity to short VCC transients | Rejects glitches ≤40µs at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments |
| CMOS-compatible MR interface | Accepts standard logic levels without level-shifting - simplifies connection to µP GPIO or switch inputs |
Applications
| Portable Medical Sensors | Battery-Powered PDAs |
|---|---|
Use Scenario: Continuous glucose monitoring patch with CR2032 coin cell powering ARM Cortex-M0 MCU and analog front-end. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to hold MCU in reset until regulated 2.4V rail stabilizes post-power-up. Use Value: 170nA ICC minimizes quiescent drain; 40ms tRP guarantees full LDO settling and clock stabilization before firmware execution. |
Use Scenario: Handheld PDA using dual-supply architecture with 2.4V core rail and 3.3V I/O rail. IC Role / Device Role / Timing Role: Voltage monitor on 2.4V core rail generating active-high RESET signal synchronized to MR button press. Use Value: Internal 10kΩ MR pullup eliminates discrete resistor; push-pull output interfaces directly to µP's active-high reset pin. |
| Low-Power Wearables | Remote Patient Monitors |
Use Scenario: ECG patch with Bluetooth LE radio and ultra-low-power sensor hub operating from 2.4V Li-SOCl₂ battery. IC Role / Device Role / Timing Role: Brownout detector ensuring MCU reset occurs before analog sensor ADC reference collapses below specification. Use Value: 2.4V VTH ±2.5% matches battery discharge curve midpoint; RESET valid to 1.1V prevents undefined state during end-of-life voltage sag. |
Use Scenario: Cellular-connected blood pressure cuff with intermittent measurement cycles and sleep mode between readings. IC Role / Device Role / Timing Role: Power supervisor asserting RESET on wake-up to guarantee clean boot sequence after long sleep periods. Use Value: 40ms tRP accommodates slow-starting PMICs; MR input allows clinical staff to force hard reset via front-panel button. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K24DBVR | 2.4V threshold, 40ms timeout, open-drain active-low RESET, 1.2µA ICC | Requires external pullup; higher ICC limits battery lifetime in multi-year deployments | Select when legacy board uses open-drain RESET and existing pullup resistor can be reused |
| MAX6316LUK24D2+T | 2.4V threshold, 40ms timeout, active-low push-pull RESET, 800nA ICC | Active-low output requires µP reset pin compatibility check; higher ICC than MAX6855 | Choose if system design mandates active-low RESET and lower cost is prioritized over nanopower operation |
Compared with TPS3837K24DBVR and MAX6316LUK24D2+T, the MAX6855UK24D2+T delivers the lowest ICC (170nA vs. 1.2µA/800nA) and native active-high push-pull output - eliminating pullup resistors and maximizing battery service life in always-on medical wearables.
Availability
MAX6855UK24D2+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered PDAs, low-power wearables, and remote patient monitors requiring stable component supply with long-term lifecycle support.
Supply support for MAX6855UK24D2+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, sensing, and connectivity applications in industrial, medical, and consumer markets.
The MAX6854–MAX6869 family targets ultra-low-power microprocessor supervision in space-constrained, battery-operated systems where nanoscale ICC and guaranteed reset validity at low VCC are critical.
FAQ
What is the exact reset threshold voltage of the MAX6855UK24D2+T?
The MAX6855UK24D2+T has a factory-trimmed reset threshold voltage of 2.4V with ±2.5% tolerance over temperature (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "24" corresponds to 2.4V nominal VTH. The device guarantees valid RESET assertion down to VCC = +1.1V, making it suitable for deep brownout detection scenarios.
Does the MAX6855UK24D2+T require an external pullup resistor on the MR pin?
No, the MAX6855UK24D2+T includes an internal 10kΩ pullup resistor from MR to VCC. The MR pin is active-low with logic thresholds of 0.3×VCC (VIL) and 0.7×VCC (VIH), allowing direct connection to CMOS outputs or momentary switches to GND. Leaving MR unconnected defaults to high, disabling manual reset - no external components are needed for basic operation.
What is the function of the RESET output on the MAX6855UK24D2+T?
The RESET output of the MAX6855UK24D2+T is an active-high push-pull driver. It transitions high when VCC drops below 2.4V or when MR is pulled low, and remains high for ≥40ms after VCC rises above VTH and MR is released. Because it is push-pull, no external pullup resistor is required - unlike open-drain alternatives - simplifying PCB layout and reducing component count.
Can the MAX6855UK24D2+T operate with supply voltages below 2.4V?
Yes, the MAX6855UK24D2+T operates with VCC from 1.1V to 5.5V. Its reset function remains fully specified down to VCC = +1.1V, ensuring deterministic behavior during brownout conditions. Below 1.1V, RESET output may become invalid, but the device continues to draw only 170nA typical current - supporting graceful shutdown sequencing in ultra-low-voltage systems.
How does the MAX6855UK24D2+T handle short-duration supply transients?
The MAX6855UK24D2+T rejects VCC transients ≤40µs in duration when the overdrive is 100mV (i.e., VCC dips 100mV below 2.4V threshold), as shown in Figure MAX684 toc05. This transient immunity prevents false resets caused by switching noise or load dump events, making it robust in electrically noisy portable medical and industrial environments.
MAX6855UK24D2+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:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK24D2+T FAQ
1.How can I place an order for MAX6855UK24D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK24D2+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 MAX6855UK24D2+T reliable?
The price and inventory of MAX6855UK24D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK24D2+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK24D2+T?
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4.How is shipping managed for MAX6855UK24D2+T?
MAX6855UK24D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK24D2+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 MAX6855UK24D2+T?
For technical support, including MAX6855UK24D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK24D2+T requirements.
6.How does Aetrix verify that MAX6855UK24D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK24D2+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 MAX6855UK24D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK24D2+T?
All MAX6855UK24D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK24D2+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 MAX6855UK24D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK24D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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