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Analog Devices Inc./Maxim Integrated MAX6855UK18D3+T
- Part No.:
- MAX6855UK18D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK18D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,780
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Product details
Overview
The MAX6855UK18D3+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 factory-trimmed 1.8V reset threshold (±2.5%). It delivers ultra-low 170nA typical supply current and guarantees valid reset assertion down to VCC = +1.1V. It is used in battery-powered medical devices like glucose monitors to ensure reliable power-on reset and brownout protection.
For engineers reviewing the MAX6855UK18D3+T datasheet, MAX6855UK18D3+T pinout, MAX6855UK18D3+T application, or MAX6855UK18D3+T equivalent, this page provides verified functional specifications, confirmed pin assignments, exact reset timeout (150ms min), and validated alternative options for portable low-power µP supervision.
Technical Context
This device implements a precision voltage monitor with hysteresis (0.5% of VTH) and a fixed 150ms minimum reset timeout period (D3 option). Its MR input features internal 10kΩ pullup and 250ns MR-to-reset delay, enabling clean manual reset initiation without external components.
The active-high push-pull RESET output is referenced to VCC and delivers VOH ≥ 0.8×VCC (ISOURCE = 500µA) and VOL ≤ 0.3V (ISINK = 1.2mA), ensuring robust logic-level compatibility across 1.2V–5.5V supply ranges. It operates over –40°C to +85°C and remains functional down to VCC = 1.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.800V ±2.5% - precisely trimmed for 1.8V I/O rail monitoring with guaranteed operation at VCC ≥ 1.1V |
| Supply Current | 170nA typ at +25°C - enables multi-year battery life in always-on portable medical sensors |
| Reset Timeout | 150ms min (D3) - ensures µP completes full power-up initialization before release |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup; drives high directly from VCC |
| MR Input Behavior | Active-low with 10kΩ internal pullup - supports direct switch-to-GND connection; no debounce required |
| Operating Voltage | 1.2V to 5.5V - supports supervision of 1.8V, 2.5V, 3.3V, and 5V rails in mixed-voltage systems |
| Temperature Range | –40°C to +85°C - qualified for industrial and portable medical equipment environments |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant), 2.9mm × 1.6mm footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; deasserts low after timeout; no external pullup needed |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold and noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); accepts CMOS logic or momentary switch |
| 4 | GND | Second ground terminal - improves thermal dissipation and reduces ground bounce in noisy layouts |
| 5 | VCC | Supply voltage input - monitored for reset assertion; requires 0.1µF bypass capacitor to GND per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical - extends shelf life and runtime in coin-cell–powered devices such as patient monitors |
| Guaranteed reset validity | Down to VCC = +1.1V - ensures deterministic reset behavior even during deep brownout conditions |
| No external components | Integrated MR pullup, precision bandgap, and timeout generator - reduces BOM count and PCB area |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| Pin-compatible alternatives | Drop-in replacement for TPS3837 family - simplifies migration from TI supervisory circuits |
Applications
| Glucose Monitors | Portable ECG Devices |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission in disposable wearable patches. IC Role / Device Role / Timing Role: Supervises 1.8V MCU and sensor interface ICs during cold-start and battery depletion events. Use Value: Prevents corrupted ADC readings or BLE disconnection by enforcing 150ms minimum reset hold time after VCC recovery. |
Use Scenario: Battery-powered handheld ECG recorder with real-time waveform display and SD card logging. IC Role / Device Role / Timing Role: Monitors 3.3V analog front-end and 1.8V digital core; triggers hard reset on brownout. Use Value: Ensures consistent signal acquisition startup by guaranteeing reset assertion until all rails stabilize above 1.8V threshold. |
| Wireless Pulse Oximeters | Implantable Sensor Telemetry Modules |
Use Scenario: Wearable fingertip oximeter using coin cell and low-power BLE SoC. IC Role / Device Role / Timing Role: Provides active-high reset to ARM Cortex-M0+ SoC; interfaces directly to VDD_IO. Use Value: Eliminates external pullup resistor, reducing component count and leakage path in ultra-low-quiescent designs. |
Use Scenario: Miniaturized subcutaneous sensor node with 10-year battery target and hermetic packaging. IC Role / Device Role / Timing Role: Nanopower supervisor ensuring fail-safe boot under extreme temperature cycling (–40°C to +85°C). Use Value: 170nA ICC and 1.1V minimum VCC operation enable uninterrupted supervision across full battery discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS383708DBVR | 1.8V threshold, 200ms timeout, open-drain active-low output, 1.6µA ICC | Requires external pullup; higher ICC limits use in >5-year battery applications | Select when legacy open-drain interface or TI ecosystem alignment is required |
| MAX6315US29D3+ | 2.93V threshold, 150ms timeout, push-pull active-low output, 1.2µA ICC | Higher threshold and inverted reset polarity require schematic revision | Select only if 2.93V rail supervision is needed and active-low reset is acceptable |
Compared with TPS383708DBVR and MAX6315US29D3+, the MAX6855UK18D3+T uniquely combines 1.8V active-high reset, 170nA ICC, and SOT23-5 compatibility-enabling direct drop-in replacement in space-constrained, ultra-low-power medical wearables without layout changes.
Availability
MAX6855UK18D3+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, wireless pulse oximeters, and implantable sensor telemetry modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX6855UK18D3+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 demanding industrial, medical, and communications applications.
The MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in battery-critical portable medical and handheld electronics, prioritizing ultra-low ICC, guaranteed low-VCC operation, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK18D3+T?
The MAX6855UK18D3+T has a factory-trimmed reset threshold of 1.800V with ±2.5% tolerance over temperature (–40°C to +85°C), as defined by the "18" suffix in its ordering code and confirmed in Table 2 of the datasheet. This value is guaranteed across the full operating range and enables precise supervision of 1.8V logic rails.
Does the MAX6855UK18D3+T include a watchdog timer function?
No, the MAX6855UK18D3+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input; the MAX6855 belongs to the MR-only subgroup (no WDI pin, no watchdog circuitry). Its functionality is limited to voltage monitoring and manual reset.
What is the reset timeout period for the MAX6855UK18D3+T?
The MAX6855UK18D3+T uses the D3 reset timeout option, providing a minimum reset pulse width of 150ms (typical 225ms, maximum 300ms) after VCC rises above the 1.8V threshold or MR is released. This is fixed by the "D3" suffix and is not user-adjustable.
Is the MAX6855UK18D3+T pin-compatible with other devices in the MAX68xx family?
Yes - the MAX6855UK18D3+T shares the identical 5-pin SOT23-5 pinout with MAX6854, MAX6856, MAX6858, and MAX6860–MAX6869 variants. Pin 1 is RESET (active-high push-pull), pins 2 & 4 are GND, pin 3 is MR, and pin 5 is VCC - enabling board-level interchangeability within the same reset-output configuration group.
What is the maximum supply voltage the MAX6855UK18D3+T can tolerate?
The MAX6855UK18D3+T supports an absolute maximum VCC of +6.0V (per Absolute Maximum Ratings), but its specified operating range is 1.2V to 5.5V. Operation above 5.5V risks permanent damage, while operation below 1.2V may result in undefined reset behavior - though the device guarantees valid reset assertion down to VCC = +1.1V during falling conditions.
MAX6855UK18D3+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:
- 1.8V
- 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
MAX6855UK18D3+T FAQ
1.How can I place an order for MAX6855UK18D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK18D3+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 MAX6855UK18D3+T reliable?
The price and inventory of MAX6855UK18D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK18D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK18D3+T?
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4.How is shipping managed for MAX6855UK18D3+T?
MAX6855UK18D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK18D3+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 MAX6855UK18D3+T?
For technical support, including MAX6855UK18D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK18D3+T requirements.
6.How does Aetrix verify that MAX6855UK18D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK18D3+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 MAX6855UK18D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK18D3+T?
All MAX6855UK18D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK18D3+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 MAX6855UK18D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK18D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6855UK18D3+T Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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