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Analog Devices Inc./Maxim Integrated MAX6855UK27D3+T
- Part No.:
- MAX6855UK27D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK27D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,511
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Product details
Overview
The MAX6855UK27D3+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 2.700V reset threshold (suffix "27"). It delivers ultra-low 170nA typical supply current, guarantees valid reset down to VCC = +1.1V, and provides 150ms minimum reset timeout (suffix "D3"). It is used in battery-powered medical monitors and portable electronics to ensure reliable power-on reset and brownout protection.
For engineers reviewing the MAX6855UK27D3+T datasheet, MAX6855UK27D3+T pinout, MAX6855UK27D3+T application, or MAX6855UK27D3+T equivalent, this page provides verified functional specifications, confirmed pin roles, exact reset timing behavior, and validated alternative options for low-power µP supervision in space-constrained, long-life systems.
Technical Context
The MAX6855UK27D3+T implements a precision voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, coupled with a fixed 150ms 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 when asserted.
It includes an internally pulled-up MR input (10kΩ to VCC) with 250ns MR-to-reset delay and 1µs minimum pulse width support. Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6855UK27D3+T lacks WDI and CT pins - confirming it is a manual-reset-only, non-watchdog supervisory device within the MAX685x family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.700V ±2.5% - precisely matches 2.7V rail supervision for Li-ion or regulated 2.7V systems |
| Supply Current | 170nA typical at +25°C - enables >10-year battery life in coin-cell-powered devices |
| Reset Timeout | 150ms minimum - ensures µP initialization completes before release from reset |
| Operating Voltage | 1.2V to 5.5V - supports operation down to near-dead battery levels while maintaining reset validity to 1.1V |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup; drives high directly to VCC |
| MR Input Behavior | Active-low with 10kΩ internal pullup - simplifies manual reset switch interface without external components |
| VCC Immunity | Immune to transients ≤40µs at 100mV overdrive - prevents false resets in noisy power environments |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint-compatible with industry-standard 5-pin SOT23 layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; requires no external pullup; referenced to VCC |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold and timing |
| 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 - electrically tied to Pin 2 internally; improves noise immunity in high-frequency layouts |
| 5 | VCC | Supply and monitored voltage input - powers device and serves as reset trigger source; bypass with 0.1µF to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical - extends shelf life and runtime in energy-harvesting and implantable medical sensors |
| Guaranteed reset validity | Valid down to VCC = +1.1V - ensures deterministic reset assertion even during deep brownout |
| No external components | Integrated MR pullup and precision voltage reference - reduces BOM count and PCB area |
| Transient immunity | Rejects VCC glitches ≤40µs at 100mV overdrive - eliminates need for additional RC filtering |
| SOT23-5 footprint | 1.6mm × 2.9mm × 1.1mm - enables integration into ultra-compact wearables and hearing aids |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing in disposable patch-style wearables powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Supervises 2.7V regulated rail; asserts active-high RESET on power-up and brownout to hold MCU in reset until stable. Use Value: 170nA supply current extends battery life beyond 12 months; 150ms timeout ensures ADC and RF startup complete before firmware execution. |
Use Scenario: Portable ECG/SpO₂ units with dual power sources (battery + USB). IC Role / Device Role / Timing Role: Monitors main 2.7V system rail; generates clean, glitch-immune reset signal during battery switchover events. Use Value: Immunity to ≤40µs transients prevents spurious resets during USB insertion; VCC = 1.1V validity covers full discharge curve. |
| Smart Hearing Aids | Industrial Handheld Scanners |
Use Scenario: Rechargeable hearing aids using single-cell Li-ion (2.7–4.2V range). IC Role / Device Role / Timing Role: Provides precise 2.700V undervoltage lockout and power-on reset via active-high push-pull output. Use Value: Eliminates external pullup resistor - saves space in 3.2mm × 3.2mm module; push-pull drive ensures fast, rail-to-rail reset edge for low-voltage MCUs. |
Use Scenario: Ruggedized barcode scanners operating in variable-temperature warehouses (-20°C to +60°C). IC Role / Device Role / Timing Role: Supervises 2.7V logic rail; initiates controlled reset on cold-start or vibration-induced power droop. Use Value: ±2.5% threshold accuracy over -40°C to +85°C ensures consistent trip point across environmental extremes; SOT23-5 withstands reflow and mechanical shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K27QDBVR | 2.7V threshold, 200ms timeout, open-drain active-low output, 1.5µA ICC | Requires external pullup; higher supply current reduces battery life in multi-year deployments | Select when interfacing with legacy µPs requiring active-low reset and board already includes pullup |
| MAX6315US27D3+ | 2.7V threshold, 140ms timeout, push-pull active-low output, 800nA ICC | Active-low output conflicts with MAX6855UK27D3+T's active-high logic; different pinout (Pin 1 = GND) | Choose only if redesign allows pinout change and system reset architecture uses active-low assertion |
Compared with TPS3837K27QDBVR and MAX6315US27D3+, the MAX6855UK27D3+T uniquely combines ultra-low 170nA current, active-high push-pull output (no pullup needed), and guaranteed 1.1V reset validity - making it optimal for space- and energy-constrained medical and wearable designs where layout area and battery longevity are critical.
Availability
MAX6855UK27D3+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, smart hearing aids, and industrial handheld scanners requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6855UK27D3+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 MAX685x family was designed specifically for nanopower microprocessor supervision in battery-critical portable and medical electronics, emphasizing ultra-low ICC, precise threshold accuracy, and robust transient immunity in minimal footprints.
FAQ
What is the exact reset threshold voltage of the MAX6855UK27D3+T?
The MAX6855UK27D3+T has a factory-trimmed reset threshold of 2.700V, with ±2.5% tolerance over the full -40°C to +85°C operating range. This value is confirmed by the "27" suffix in the part number per Maxim's Threshold Suffix Guide (Table 2), and is validated in the Electrical Characteristics table under VTH parameter. The MAX6855UK27D3+T maintains this accuracy without external calibration.
Does the MAX6855UK27D3+T include a watchdog timer function?
No, the MAX6855UK27D3+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which offers only voltage monitoring and manual reset (MR) functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants, identifiable by "S" or "L" suffixes in the ordering code - absent in MAX6855UK27D3+T.
What is the reset output configuration of the MAX6855UK27D3+T?
The MAX6855UK27D3+T features an active-high push-pull reset output on Pin 1. When asserted (during VCC undervoltage or MR activation), RESET goes high to VCC; when deasserted, it drives low. This eliminates the need for an external pullup resistor and ensures rail-to-rail logic compatibility with modern low-voltage MCUs.
What is the minimum reset timeout period for the MAX6855UK27D3+T?
The MAX6855UK27D3+T has a minimum reset timeout period of 150ms, indicated by the "D3" suffix per Table 4 (Reset Timeout Periods). This duration is guaranteed after VCC rises above the 2.700V threshold or after MR is released, ensuring sufficient time for power stabilization and µP internal initialization before firmware execution resumes.
Is the MAX6855UK27D3+T pin-compatible with other SOT23-5 supervisors?
The MAX6855UK27D3+T uses a standard 5-pin SOT23-5 footprint but is not pin-compatible with all SOT23 supervisors. Its Pin 1 = RESET (active-high), Pin 2 = GND, Pin 3 = MR, Pin 4 = GND, Pin 5 = VCC. This differs from common alternatives like TPS3837 (Pin 1 = VDD) or MAX6315 (Pin 1 = GND), requiring PCB layout verification before substitution.
MAX6855UK27D3+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:
- 2.7V
- 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
MAX6855UK27D3+T FAQ
1.How can I place an order for MAX6855UK27D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK27D3+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 MAX6855UK27D3+T reliable?
The price and inventory of MAX6855UK27D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK27D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK27D3+T?
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4.How is shipping managed for MAX6855UK27D3+T?
MAX6855UK27D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK27D3+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 MAX6855UK27D3+T?
For technical support, including MAX6855UK27D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK27D3+T requirements.
6.How does Aetrix verify that MAX6855UK27D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK27D3+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 MAX6855UK27D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK27D3+T?
All MAX6855UK27D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK27D3+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 MAX6855UK27D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK27D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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