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Analog Devices Inc./Maxim Integrated MAX6855UK29D1+T
- Part No.:
- MAX6855UK29D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK29D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,171
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Product details
Overview
The MAX6855UK29D1+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing active-high push-pull reset output, manual reset input (MR), and factory-trimmed 2.925V reset threshold with 10ms minimum reset timeout. It monitors VCC for brownout detection, asserts reset during power-up/down, and guarantees valid reset operation down to VCC = +1.1V - ideal for low-power portable medical devices and battery-powered instrumentation.
For engineers reviewing the MAX6855UK29D1+T datasheet, MAX6855UK29D1+T pinout, MAX6855UK29D1+T application, or MAX6855UK29D1+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing behavior, real-world use cases, and validated alternative options - all grounded in Maxim's official documentation and electrical specifications.
Technical Context
The MAX6855UK29D1+T implements a precision voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, paired with a fixed 10ms minimum reset timeout after VCC recovery or MR deassertion. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load, ensuring reliable µP initialization without external pullups.
It features an internally pulled-up MR input (10kΩ to VCC) with 1µs minimum pulse width support and 250ns MR-to-reset delay, enabling clean manual reset triggering. Immunity to short VCC transients (<40µs at 100mV overdrive) and guaranteed operation down to VCC = +1.1V make it suitable for ultra-low-voltage systems where supply stability is marginal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.925V (factory-trimmed, ±2.5% tolerance) - sets precise brownout detection point for 3.0V/3.3V rail monitoring |
| Reset Timeout Period | 10ms (minimum) - ensures µP remains held in reset long enough for stable clock and power settling |
| Supply Current | 170nA typical at +25°C - enables multi-year battery life in always-on portable health monitors |
| Operating Voltage Range | 1.2V to 5.5V - supports direct integration into 1.8V, 2.5V, 3.3V, and 5V systems without level-shifting |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies interface to µP reset pin |
| VCC Validity Limit | Guaranteed RESET validity down to VCC = +1.1V - ensures deterministic reset assertion even during deep brownout |
| MR Input Behavior | Internally pulled up to VCC (10kΩ); accepts CMOS logic levels; 1µs minimum pulse width - compatible with tactile switches and digital logic |
Pinout & Package
Package: 5-pin SOT23-5 (lead-free, RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high when VCC ≥ 2.925V and MR is inactive; sinks ≤0.3V at 1.2mA when asserted low |
| 2, 4 | GND | Ground reference - both pins must be connected to common system ground for proper noise immunity and reset timing |
| 3 | MR | Active-low manual reset input - pulling low initiates reset; internally pulled up to VCC (10kΩ); 250ns propagation delay to RESET |
| 5 | VCC | Supply voltage input - monitored for reset generation; requires 0.1µF bypass capacitor to GND for noise rejection |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in glucose meters and wearable patient monitors beyond 5 years |
| Factory-trimmed reset threshold | 2.925V ±2.5% - eliminates external resistor network and calibration effort for 3.0V system supervision |
| Fixed 10ms reset timeout | Guaranteed minimum duration - satisfies µP power-on reset timing requirements without external RC components |
| Active-high push-pull RESET | No external pullup required - reduces BOM count and PCB footprint vs. open-drain alternatives |
| VCC = +1.1V reset validity | Ensures deterministic reset assertion during deep undervoltage - critical for fail-safe behavior in medical devices |
| MR glitch rejection | 200ns - prevents spurious resets from ESD or switching noise on manual reset line |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous glucose sensing in handheld or wearable units powered by coin-cell batteries. IC Role / Device Role / Timing Role: Supervises 3.0V analog front-end and MCU supply; asserts active-high RESET to hold system in known state during battery voltage sag. Use Value: 170nA quiescent current enables >5-year battery life; 2.925V threshold matches nominal 3.0V rail; 10ms timeout satisfies ADuCM355 and similar MCU reset timing. |
Use Scenario: Portable ECG or SpO₂ monitors operating from single Li-ion or alkaline cells. IC Role / Device Role / Timing Role: Monitors main 3.3V system rail and triggers reset if voltage drops below safe operating level during RF transmission or sensor activation. Use Value: Guaranteed RESET validity down to VCC = +1.1V prevents undefined MCU behavior during deep discharge; GND-connected pins minimize layout sensitivity to noise. |
| Industrial Handheld Terminals | Low-Power IoT Sensors |
|
Use Scenario: Ruggedized barcode scanners or field service terminals using replaceable AA/AAA batteries. IC Role / Device Role / Timing Role: Provides power-on reset and manual reset via button press; interfaces directly to ARM Cortex-M0+ reset pin with no level translation. Use Value: Active-high push-pull output eliminates pullup resistor; MR internal 10kΩ pullup simplifies switch interface; 250ns MR-to-reset delay ensures responsive user reset. |
Use Scenario: Battery-powered environmental sensors transmitting data via BLE or LoRaWAN every 5–60 minutes. IC Role / Device Role / Timing Role: Supervises 1.8V or 2.5V MCU and sensor supply; holds reset until regulated rail stabilizes post-wakeup from deep sleep. Use Value: 1.2V–5.5V operating range supports diverse supply architectures; 40µs VCC-to-reset delay ensures fast response to brownout events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K29QDBVR | 2.93V reset threshold, 200ms min timeout, open-drain active-low RESET, 1.6µA ICC | Requires external pullup; longer timeout may delay system boot; higher current impacts ultra-low-power designs | Choose only if open-drain interface or longer reset hold time is required; not drop-in due to output polarity and timing mismatch |
| MAX6315US29D3+ | 2.93V threshold, 10ms timeout, active-low open-drain RESET, 1.2µA ICC, SOT23-5 | Active-low output conflicts with MAX6855UK29D1+T's active-high logic; higher supply current reduces battery life | Select when legacy active-low reset architecture exists; verify µP reset pin compatibility and recalculate pullup values |
Compared with TPS3837K29QDBVR and MAX6315US29D3+, the MAX6855UK29D1+T offers the lowest supply current (170nA vs. >1.2µA), active-high push-pull output eliminating external components, and tighter reset threshold tolerance (±2.5% vs. ±3.5%), making it optimal for space-constrained, battery-critical medical and portable instrumentation.
Availability
MAX6855UK29D1+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, industrial handheld terminals, and low-power IoT sensors requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK29D1+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 communications markets.
The MAX6855UK29D1+T belongs to the MAX6854–MAX6869 nanopower supervisory family, engineered specifically for ultra-low-current, high-reliability reset supervision in battery-powered portable equipment where long service life and deterministic fail-safe behavior are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6855UK29D1+T?
The MAX6855UK29D1+T has a factory-trimmed reset threshold voltage of 2.925V, with guaranteed tolerance of ±2.5% over the full -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the official Maxim datasheet, where suffix "29" corresponds to 2.925V nominal. The MAX6855UK29D1+T maintains this accuracy without external calibration.
Does the MAX6855UK29D1+T include a watchdog timer function?
No, the MAX6855UK29D1+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input and watchdog functionality. The MAX6855UK29D1+T provides voltage monitoring, manual reset (MR), and fixed 10ms reset timeout - confirming it is a dedicated supervisory circuit without watchdog capability.
What is the RESET output configuration of the MAX6855UK29D1+T?
The MAX6855UK29D1+T features an active-high push-pull RESET output, as explicitly stated in the MAX6854/MAX6855/MAX6856 Pin Description table and Selector Guide. Pin 1 delivers RESET high when VCC ≥ 2.925V and MR is inactive; it drives low during reset assertion. This eliminates the need for an external pullup resistor, distinguishing it from open-drain or active-low variants in the same family.
Can the MAX6855UK29D1+T operate reliably below 1.8V supply?
Yes, the MAX6855UK29D1+T operates reliably down to VCC = +1.2V (minimum specified), and its RESET output remains valid down to VCC = +1.1V - confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This allows use in 1.2V, 1.5V, and 1.8V systems, including ultra-low-voltage MCUs like the MSP430FRxx series, without compromising reset integrity.
Is the MR input of the MAX6855UK29D1+T internally pulled up?
Yes, the MR input of the MAX6855UK29D1+T is internally pulled up to VCC through a 10kΩ resistor, as documented in the Pin Description section and Applications Information. This allows direct connection of a momentary switch from MR to GND for manual reset, with no external components required. The internal pullup ensures MR remains inactive (high) when unconnected or tied to VCC.
MAX6855UK29D1+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:
- 2.925V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK29D1+T FAQ
1.How can I place an order for MAX6855UK29D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK29D1+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 MAX6855UK29D1+T reliable?
The price and inventory of MAX6855UK29D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK29D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK29D1+T?
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MAX6855UK29D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK29D1+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 MAX6855UK29D1+T?
For technical support, including MAX6855UK29D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK29D1+T requirements.
6.How does Aetrix verify that MAX6855UK29D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK29D1+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 MAX6855UK29D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK29D1+T?
All MAX6855UK29D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK29D1+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 MAX6855UK29D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK29D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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