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Analog Devices Inc./Maxim Integrated MAX6855UK16D5+T
- Part No.:
- MAX6855UK16D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK16D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,937
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Product details
Overview
The MAX6855UK16D5+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, 1.575V factory-trimmed reset threshold, 450ms minimum reset timeout (D5), and manual reset input (MR). It monitors VCC supply integrity, asserts reset during brownout or manual trigger, and guarantees valid reset down to VCC = +1.1V - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6855UK16D5+T datasheet, MAX6855UK16D5+T pinout, MAX6855UK16D5+T application, or MAX6855UK16D5+T equivalent, key selection criteria include its ultra-low 170nA typical supply current, fixed 1.575V reset threshold with ±2.5% tolerance, 450ms reset timeout, MR input with 10kΩ internal pullup, and compatibility with 1.2V–5.5V VCC operation.
Technical Context
This device implements a precision voltage monitor with hysteresis (0.5% of VTH) and a digital reset timeout timer. The reset assertion logic combines VCC falling-edge detection, MR low-level assertion, and guaranteed reset deassertion delay after VCC recovery - all operating without external components.
Its push-pull active-high RESET output is referenced to VCC and delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V), while VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V). Immunity to short VCC transients (<40µs at 100mV overdrive) ensures robust operation in noisy portable environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V (factory-trimmed, ±2.5% tolerance) - sets precise brownout detection point for 1.8V/2.5V system rails |
| Reset Timeout | 450ms (min, D5 option) - ensures µP completes power-up initialization before release |
| Supply Current | 170nA (typ at +25°C) - enables multi-year battery life in always-on medical sensors |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail embedded systems |
| Reset Valid Down To | VCC = +1.1V - guarantees reliable reset assertion even during deep brownout |
| MR Input Logic | Active-low, internally pulled up to VCC via 10kΩ - eliminates need for external pullup in manual reset switches |
| Output Type | Push-pull active-high RESET - drives µP reset pin directly without external pullup resistor |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output asserted high during reset; sinks current when deasserted; no external pullup required |
| 2 | GND | Ground reference for all internal circuitry and reset timing accuracy |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS logic or open-drain signals |
| 4 | GND | Second ground terminal - improves noise immunity and thermal performance in compact layouts |
| 5 | VCC | Supply input monitored for reset; bypass with 0.1µF capacitor to GND for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell-powered devices |
| No external components | Integrated reset timer, pullup, and voltage reference eliminate BOM cost and PCB area |
| VCC transient immunity | Rejects <40µs VCC glitches at 100mV overdrive - prevents spurious resets in EMI-prone environments |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V - critical for safe shutdown in low-voltage medical systems |
| MR glitch rejection | 200ns minimum pulse rejection on MR input - suppresses contact bounce and ESD-induced false triggers |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 7–14 days on lithium coin-cell power. IC Role / Device Role / Timing Role: Supervises VCC during RF transmission bursts and sensor biasing; asserts RESET if battery drops below 1.6V. Use Value: Prevents corrupted sensor data writes to flash memory during brownout, ensuring regulatory compliance (FDA/IEC 62304). |
Use Scenario: Portable ECG/SpO₂ logger with sleep mode and wake-on-event functionality. IC Role / Device Role / Timing Role: Monitors main 3.3V rail; holds µP in reset until stable post-battery insertion or wake-up event. Use Value: Eliminates boot-time race conditions between ADC calibration and µP firmware execution. |
| Smart Hearing Aids | Wearable Fitness Trackers |
|
Use Scenario: Rechargeable hearing aid using 1.2V NiMH cell with tight voltage margin. IC Role / Device Role / Timing Role: Provides 1.575V reset threshold aligned to battery end-of-discharge; 450ms timeout accommodates DSP warm-up. Use Value: Avoids audible artifacts caused by partial µP initialization during low-VCC transitions. |
Use Scenario: Multi-sensor wristband powered by 3.7V LiPo with dynamic voltage scaling. IC Role / Device Role / Timing Role: Detects 3.3V LDO dropout during peak BLE transmission; asserts reset before firmware crash. Use Value: Reduces field failure rate from unhandled brownout-induced memory corruption by >99.7%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | 3.3V fixed reset threshold; 200ms timeout; 1.2µA ICC (typ); SOT23-5 | Designed for 3.3V systems only; higher quiescent current limits battery lifetime | Select when system uses stable 3.3V rail and ultra-low ICC is not required |
| MAX6361KA29D3+T | 2.93V reset threshold; 200ms timeout; 1.1µA ICC (typ); same SOT23-5 footprint | Higher threshold and shorter timeout - unsuitable for 1.8V/2.5V brownout detection | Choose only if legacy design requires pin-compatible replacement with tighter VTH tolerance (±0.5%) |
Compared with TPS3836K33DBVR and MAX6361KA29D3+T, the MAX6855UK16D5+T uniquely delivers 1.575V threshold + 450ms timeout + 170nA ICC in one SOT23-5 package - making it the sole fit for long-life, low-voltage medical wearables requiring precise sub-2V brownout protection.
Availability
MAX6855UK16D5+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered patient monitors, and low-power wearable electronics requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK16D5+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 MAX685x family targets ultra-low-power supervisory functions in space-constrained, battery-operated systems - emphasizing nanopower operation, guaranteed reset validity at low VCC, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK16D5+T?
The MAX6855UK16D5+T has a factory-trimmed reset threshold of +1.575V, 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 datasheet, where suffix "16" corresponds to 1.575V. The device asserts reset when VCC falls below this threshold and maintains reset for the full 450ms timeout after VCC recovers.
Does the MAX6855UK16D5+T include a watchdog timer function?
No, the MAX6855UK16D5+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input and watchdog timeout capability. The MAX6855UK16D5+T belongs to the MAX6854/MAX6855/MAX6856 group, which provides voltage monitoring and manual reset only - confirmed by absence of WDI pin and watchdog-related electrical characteristics in its datasheet tables.
What is the function of Pin 1 on the MAX6855UK16D5+T?
Pin 1 of the MAX6855UK16D5+T is the active-high push-pull RESET output. Unlike open-drain variants, this pin drives high during reset assertion and low when deasserted - eliminating need for an external pullup resistor. Its VOH is guaranteed ≥0.8×VCC at 500µA source current (VCC ≥ 2.38V), and VOL ≤ 0.3V at 1.2mA sink current (VCC ≥ 2.38V), enabling direct interface to µP reset inputs.
Can the MAX6855UK16D5+T operate with a 1.2V supply?
Yes, the MAX6855UK16D5+T operates with VCC as low as 1.2V, and its reset output remains valid down to VCC = +1.1V. Electrical Characteristics table confirms functional operation across 1.2V–5.5V, with supply current specified at 1.2V (7µA typ when reset asserted, 170nA typ when deasserted). This makes it suitable for single-cell NiMH or low-VCC energy-harvesting systems.
What does the "D5" in MAX6855UK16D5+T indicate?
The "D5" suffix in MAX6855UK16D5+T specifies the reset timeout period: D5 corresponds to a minimum timeout of 450ms, with typical 600ms and maximum 900ms (per Table 4, Reset Timeout Periods). This timeout begins when VCC rises above the 1.575V threshold or MR is released, ensuring sufficient hold time for µP power-up sequencing and peripheral initialization before release.
MAX6855UK16D5+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:
- 1.575V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK16D5+T FAQ
1.How can I place an order for MAX6855UK16D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK16D5+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 MAX6855UK16D5+T reliable?
The price and inventory of MAX6855UK16D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK16D5+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK16D5+T?
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4.How is shipping managed for MAX6855UK16D5+T?
MAX6855UK16D5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK16D5+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 MAX6855UK16D5+T?
For technical support, including MAX6855UK16D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK16D5+T requirements.
6.How does Aetrix verify that MAX6855UK16D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK16D5+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 MAX6855UK16D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK16D5+T?
All MAX6855UK16D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK16D5+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 MAX6855UK16D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK16D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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