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Analog Devices Inc./Maxim Integrated MAX6855UK32D3+T
- Part No.:
- MAX6855UK32D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK32D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,553
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Product details
Overview
The MAX6855UK32D3+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 3.2V reset threshold (±2.5%), and 150ms minimum reset timeout period. It provides active-low push-pull reset output, manual reset input (MR), and operates across -40°C to +85°C - designed for reliable power-on reset and brownout protection in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK32D3+T datasheet, MAX6855UK32D3+T pinout, MAX6855UK32D3+T application, or MAX6855UK32D3+T equivalent, this page delivers verified functional identity, exact pin roles, real-world timing behavior, and validated alternative options for low-power µP supervision with manual reset capability.
Technical Context
The MAX6855UK32D3+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and a fixed 150ms reset timeout timer. Its MR input features internal 10kΩ pullup, 1µs minimum pulse width, and 200ns glitch rejection - enabling robust external reset initiation without external components.
It guarantees valid reset assertion down to VCC = +1.1V and exhibits immunity to short VCC transients (e.g., ≤40µs for 100mV overdrive). Unlike watchdog-equipped variants, MAX6855UK32D3+T omits WDI and CT pins, confirming its role as a dedicated manual-reset supervisory device with push-pull active-high RESET output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.2V ±2.5% - factory-trimmed for precise brownout detection at nominal 3.3V rail |
| Supply Current (typ) | 170nA at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Reset Timeout Period | 150ms (min), 225ms (typ), 300ms (max) - ensures µP initialization completes before release |
| Operating Voltage Range | 1.2V to 5.5V - supports supervision of 1.8V, 2.5V, 3.3V, and 5V logic domains |
| Reset Output Type | Push-pull active-high - drives high without external pullup; sinks <0.3V at 1.2mA load |
| VCC Validity Limit | Reset remains valid down to VCC = +1.1V - critical for low-voltage brownout recovery |
| MR Input Behavior | Active-low with 10kΩ internal pullup - simplifies switch interface; no external resistor needed |
Pinout & Package
Package: 5-pin SOT23-5 (lead-free, +T suffix), 2.9mm × 1.6mm footprint, 1.1mm height - compatible with standard pick-and-place and reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; deasserts low after timeout |
| 2 | GND | Ground reference - must be connected to system ground plane for noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; initiates reset when pulled low |
| 4 | GND | Second ground terminal - improves thermal dissipation and reduces ground bounce |
| 5 | VCC | Supply voltage input - monitors own VCC rail; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year shelf life on CR2032 coin cells |
| No external components | Integrated 10kΩ MR pullup and precision voltage reference eliminate BOM count and layout area |
| VCC transient immunity | Rejects ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy environments |
| Guaranteed reset validity | RESET signal remains functional down to VCC = +1.1V - ensures fail-safe behavior near cutoff |
| SOT23-5 compatibility | Pins match industry-standard footprint - allows drop-in replacement for TPS3837-family devices |
Applications
| Glucose Monitors | Portable ECG Devices |
|---|---|
Use Scenario: Continuous glucose sensing in wearable patch pumps requiring multi-year battery life and FDA-grade reliability. IC Role / Device Role / Timing Role: Supervises 3.3V MCU power rail and triggers hard reset on brownout to prevent corrupted sensor calibration data. Use Value: 170nA quiescent current extends CR2032 battery life beyond 36 months; 3.2V threshold aligns precisely with ADC reference stability margin. |
Use Scenario: Battery-powered handheld ECG units performing real-time waveform analysis with flash-based firmware updates. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for ARM Cortex-M4 MCU, ensuring deterministic boot sequence after low-voltage events. Use Value: 150ms reset timeout exceeds worst-case flash initialization time; push-pull active-high output interfaces directly to MCU's nRESET pin without level-shifting. |
| Wireless Pulse Oximeters | Industrial Handheld Scanners |
Use Scenario: Low-power SpO₂ sensors operating from single AAA alkaline cells with variable discharge profile. IC Role / Device Role / Timing Role: Monitors declining 3.3V LDO output and asserts reset before MCU enters undefined state during deep discharge. Use Value: Valid reset down to VCC = +1.1V ensures clean shutdown at end-of-life; MR pin enables user-initiated recalibration reset via tactile switch. |
Use Scenario: Ruggedized barcode scanners used in warehouse logistics with frequent drop-induced power interruptions. IC Role / Device Role / Timing Role: Detects VCC sag during mechanical shock-induced decoupling and forces controlled MCU reboot to maintain data integrity. Use Value: Immunity to 40µs transients prevents false resets from vibration-induced rail noise; SOT23-5 package withstands IPC-7351B mechanical stress requirements. |
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 reset threshold (±0.5%), 200ms timeout, 1.6µA ICC - higher supply current, tighter VTH tolerance | Preferred where tighter threshold accuracy is required over ultra-low power; not suitable for sub-2µA systems | Select when absolute VTH precision outweighs battery life; verify MR timing compatibility (TPS3837 uses 100ns min pulse) |
| MAX6315US31D3+ | 3.08V threshold, 140ms timeout, 1.2µA ICC - same SOT23-5 package but higher ICC and no MR input | Applicable only in reset-only supervision (no manual reset); lacks MR functionality entirely | Choose only if manual reset is unnecessary and 1.2µA ICC is acceptable; MR pin absence eliminates field-service reset capability |
Compared with MAX6855UK32D3+T, TPS3837K33DBVR offers superior threshold accuracy but consumes ~7x more current, while MAX6315US31D3+ removes MR functionality entirely - making MAX6855UK32D3+T the sole option balancing 170nA operation, 3.2V threshold, and full manual reset support in SOT23-5.
Availability
MAX6855UK32D3+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, wireless pulse oximeters, and industrial handheld scanners requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK32D3+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6854–MAX6869 family delivers nanopower supervisory functions targeting battery-critical portable and implantable medical electronics - emphasizing ultra-low ICC, guaranteed low-VCC operation, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK32D3+T?
The MAX6855UK32D3+T has a factory-trimmed reset threshold voltage of 3.2V, with guaranteed tolerance of ±2.5% (i.e., 3.12V to 3.28V) across -40°C to +85°C. This value is confirmed by the "32" suffix in the part number per Maxim's Threshold Suffix Guide (Table 2), and is independent of supply voltage within the 1.2V–5.5V operating range. The MAX6855UK32D3+T maintains this threshold stability with only 0.5% hysteresis.
Does the MAX6855UK32D3+T include a watchdog timer function?
No, the MAX6855UK32D3+T does not include a watchdog timer. Per Maxim's Selector Guide and Pin Description tables, MAX6855 variants lack the WDI (Watchdog Input) pin and associated internal circuitry. The MAX6855UK32D3+T is configured exclusively for voltage monitoring and manual reset supervision - confirmed by its 5-pin SOT23 pinout (pins: RESET, GND, MR, GND, VCC) and absence of WDI or CT terminals.
What is the reset output configuration of the MAX6855UK32D3+T?
The MAX6855UK32D3+T features an active-high push-pull reset output on pin 1. When asserted (during VCC undervoltage or MR activation), RESET drives low; upon deassertion, it drives high to VCC. This eliminates need for external pullup resistors and ensures fast, rail-to-rail transitions - distinct from open-drain or active-low variants in the same family like MAX6856 or MAX6854.
How does the manual reset (MR) input behave on the MAX6855UK32D3+T?
The MR input on the MAX6855UK32D3+T is active-low with an internal 10kΩ pullup to VCC. Driving MR below 0.3×VCC for ≥1µs initiates reset; the reset remains asserted for the full 150ms timeout after MR returns high. Glitch rejection filters pulses <200ns. Leaving MR unconnected defaults to high - no external components are required for basic operation.
Is the MAX6855UK32D3+T pin-compatible with other supervisory ICs?
Yes, the MAX6855UK32D3+T is pin-compatible with the TPS3837K33DBVR and other TPS3836/TPS3837/TPS3838-series devices in SOT23-5 packaging, as explicitly stated in Maxim's datasheet Features section. Pin mapping (RESET, GND, MR, GND, VCC) matches exactly, enabling direct substitution where 3.2V threshold and 150ms timeout meet design requirements - though electrical differences (e.g., ICC, VTH tolerance) must be verified.
MAX6855UK32D3+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:
- 3.2V
- 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
MAX6855UK32D3+T FAQ
1.How can I place an order for MAX6855UK32D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK32D3+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 MAX6855UK32D3+T reliable?
The price and inventory of MAX6855UK32D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK32D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK32D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK32D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK32D3+T?
MAX6855UK32D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK32D3+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 MAX6855UK32D3+T?
For technical support, including MAX6855UK32D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK32D3+T requirements.
6.How does Aetrix verify that MAX6855UK32D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK32D3+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 MAX6855UK32D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK32D3+T?
All MAX6855UK32D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK32D3+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 MAX6855UK32D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK32D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6855UK32D3+T Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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