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Analog Devices Inc./Maxim Integrated MAX6855UK38D3+T
- Part No.:
- MAX6855UK38D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK38D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,843
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Product details
Overview
The MAX6855UK38D3+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 3.800V reset threshold (suffix D3), and 150ms minimum reset timeout period. It monitors VCC, provides manual reset input (MR), and asserts an active-high push-pull RESET output - designed for reliable power-on reset and brownout protection in battery-critical systems like glucose monitors and portable medical devices.
For engineers reviewing the MAX6855UK38D3+T datasheet, MAX6855UK38D3+T pinout, MAX6855UK38D3+T application, or MAX6855UK38D3+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), push-pull active-high output logic, and compatibility with CMOS-level MR drive without external pullup required.
Technical Context
This device implements a precision voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, coupled with a fixed 150ms (min) reset timeout timer that holds RESET high after VCC recovers above 3.800V and MR deasserts. Its internal 10kΩ MR pullup eliminates external components, and the push-pull active-high RESET output delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V).
No watchdog timer or CT pin is present - the MAX6855UK38D3+T belongs to the MR-only, active-high RESET variant group (per Selector Guide). It shares pinout and functional behavior with MAX6854/MAX6856 but differs in output polarity and absence of open-drain or active-low options.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.800V (factory-trimmed, ±2.5% tolerance) - ensures deterministic reset assertion during VCC brownout below nominal 3.3V/3.6V rails. |
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries in always-on patient monitoring equipment. |
| Reset Timeout Period | 150ms minimum - guarantees µP reset hold time sufficient for full power stabilization and oscillator startup in low-power MCUs. |
| RESET Output Type | Push-pull active-high - drives high without external pullup; sinks <0.3V at 1.2mA load, simplifies interface to µP reset inputs requiring active-high assertion. |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input voltage designs including single-cell Li-ion (3.0–4.2V) and dual-cell alkaline (2.0–3.2V) systems. |
| Reset Validity Limit | Guaranteed to VCC = +1.1V - maintains valid RESET state deeper into undervoltage than most competitors, improving system robustness. |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC - allows direct connection to open-drain GPIO or momentary switch to GND; no external resistor needed. |
Pinout & Package
Package: 5-pin SOT23-5 (lead-free, +T suffix), footprint-compatible with industry-standard 5-lead SOT-23 layouts. Thermal pad not present; standard reflow profile applies.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; requires no external pullup; drives µP reset pin directly. |
| 2 | GND | Ground reference for all internal circuits and reset timing; must connect to system ground plane with low-inductance path. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; driven low by switch or GPIO to force reset independent of VCC level. |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity and thermal dissipation in high-density layouts. |
| 5 | VCC | Supply voltage input and monitored rail - bypass with 0.1µF ceramic capacitor to GND close to the pin for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in intermittent-sampling medical sensors. |
| No external components | Integrated 10kΩ MR pullup and precision voltage reference eliminate BOM cost and layout area for discrete biasing. |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments. |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = +1.1V - ensures fail-safe behavior even during deep brownout conditions. |
| SOT23-5 footprint | Industry-standard 5-pin package enables drop-in replacement for TPS3837 and similar supervisory ICs in space-constrained PCBs. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous glucose sensing patch with Bluetooth LE transmission, powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output; asserts active-high RESET to ARM Cortex-M0+ MCU on power-up and brownout. Use Value: 170nA ICC extends battery life beyond 2 years; 150ms timeout ensures stable clock and ADC initialization before firmware execution. |
Use Scenario: Portable ECG/SpO₂ recorder with sleep-mode wake-up every 5 minutes for 30-second measurement burst. IC Role / Device Role / Timing Role: Supervises main 3.6V supply rail; triggers hardware reset if VCC drops below 3.800V during cold-start or battery depletion. Use Value: Guaranteed reset validity to 1.1V prevents MCU lockup during final battery discharge phase; MR pin enables clinical staff-initiated recalibration reset. |
| Industrial Handheld Scanners | Smart Wearable Sensors |
|
Use Scenario: Rugged barcode scanner operating across -20°C to +60°C ambient, powered by rechargeable Li-Polymer pack. IC Role / Device Role / Timing Role: Provides power-on reset and brownout detection for the scanning engine's microcontroller; MR connected to service button. Use Value: ±2.5% VTH tolerance ensures consistent reset point across temperature; 5-pin SOT23 fits tight mechanical envelope beneath keypad. |
Use Scenario: Fitness tracker with optical heart-rate sensor, using single-cell 3.0V Li-ion battery and aggressive duty cycling. IC Role / Device Role / Timing Role: Resets application SoC during cold boot and low-VCC events; active-high RESET matches SoC's native reset polarity. Use Value: Eliminates need for level-shifting or inverter logic; 170nA ICC contributes <0.01% to total sleep-mode current budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.3V reset threshold, 200ms timeout, open-drain active-low RESET, 1.5µA ICC | Requires external pullup and level-shifting for active-high µP interfaces; higher ICC reduces battery life in ultra-low-power designs. | Select only if system uses open-drain reset architecture and 3.3V rail monitoring is mandatory. |
| MAX6315US38D3+T | Same 3.800V threshold and 150ms timeout, but push-pull active-low RESET output and 1.6µA ICC | Output polarity mismatch requires inverter or µP configuration change; 10× higher ICC impacts long-life battery operation. | Consider only when active-low reset is required and power budget allows 1.6µA quiescent draw. |
Compared with TPS3837K33DBVR and MAX6315US38D3+T, the MAX6855UK38D3+T uniquely combines ultra-low 170nA ICC, precise 3.800V threshold, 150ms timeout, and active-high push-pull RESET - eliminating external components and maximizing battery runtime in medical and portable electronics.
Availability
MAX6855UK38D3+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and industrial handheld scanners requiring stable component supply with guaranteed long-term manufacturability and lead-free compliance.
Supply support for MAX6855UK38D3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX6855UK38D3+T belongs to the MAX68xx nanopower supervisory family, engineered specifically for ultra-low-power, battery-operated medical and portable electronics where reset reliability and multi-year battery life are critical design requirements.
FAQ
What is the exact reset threshold voltage of the MAX6855UK38D3+T?
The MAX6855UK38D3+T has a factory-trimmed reset threshold voltage of 3.800V, with ±2.5% tolerance over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "38" corresponds to 3.800V nominal. The device asserts RESET high when VCC falls below this threshold and holds it for the 150ms timeout after recovery.
Does the MAX6855UK38D3+T include a watchdog timer function?
No, the MAX6855UK38D3+T does not include a watchdog timer. Per the Selector Guide and Pin Description tables, it belongs to the MAX6854/MAX6855/MAX6856 group - which provide only VCC monitoring and manual reset (MR) functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants, identifiable by "S" or "L" suffixes in the ordering code.
What is the RESET output configuration of the MAX6855UK38D3+T?
The MAX6855UK38D3+T features a push-pull active-high RESET output. As documented in the MAX6854/MAX6855/MAX6856 Pin Description table, Pin 1 is labeled "RESET" with function "Active-High Push-Pull Reset Output". It drives high during reset assertion and low when deasserted, requiring no external pullup resistor and compatible with µPs accepting active-high reset signals.
Can the MAX6855UK38D3+T operate reliably at VCC = 1.2V?
Yes, the MAX6855UK38D3+T is fully specified to operate down to VCC = 1.2V, with guaranteed reset functionality valid to VCC = +1.1V. Electrical Characteristics confirm supply voltage range of 1.2V to 5.5V, and the "Reset Valid to VCC = +1.1V" feature ensures deterministic behavior during deep brownout - critical for maintaining system integrity in fading battery conditions.
Is the MR input of the MAX6855UK38D3+T internally pulled up?
Yes, the MR input of the MAX6855UK38D3+T includes an internal 10kΩ pullup resistor to VCC, as stated in the Pin Description table and Applications Information section. This eliminates the need for an external pullup, allowing direct connection of a momentary switch to GND or interfacing with open-drain GPIO outputs without additional components.
MAX6855UK38D3+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:
- 3.8V
- 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
MAX6855UK38D3+T FAQ
1.How can I place an order for MAX6855UK38D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK38D3+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 MAX6855UK38D3+T reliable?
The price and inventory of MAX6855UK38D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK38D3+T is usually 5 days.
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Once your MAX6855UK38D3+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 MAX6855UK38D3+T?
For technical support, including MAX6855UK38D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK38D3+T requirements.
6.How does Aetrix verify that MAX6855UK38D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK38D3+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 MAX6855UK38D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK38D3+T?
All MAX6855UK38D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK38D3+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 MAX6855UK38D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK38D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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