My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6855UK27D5+T
- Part No.:
- MAX6855UK27D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK27D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,080
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6855UK27D5+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 with 300ms minimum reset timeout. It monitors VCC down to 1.1V, consumes only 170nA typical supply current, and asserts reset during power-up, brownout, or MR activation - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6855UK27D5+T datasheet, MAX6855UK27D5+T pinout, MAX6855UK27D5+T application, or MAX6855UK27D5+T equivalent, key selection criteria include its 2.700V ±2.5% reset threshold, guaranteed reset validity at VCC = 1.1V, 300ms reset timeout (D5 option), and compatibility with low-voltage µP reset inputs requiring active-high logic levels.
Technical Context
This device implements a precision voltage monitor with hysteresis (0.5% of VTH) and a digital reset timer that holds RESET high for ≥300ms after VCC exceeds 2.700V and MR deasserts. The internal 10kΩ MR pullup enables direct connection to momentary switches without external components.
Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6855UK27D5+T lacks WDI and CT pins - it is a dedicated voltage-monitoring + manual-reset IC with fixed timing and no programmable timeout or watchdog functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.700V ±2.5% - precisely triggers reset when VCC falls below this level; stable over -40°C to +85°C. |
| Reset Timeout | 300ms min - ensures µP remains held in reset long enough for full power stabilization before boot. |
| Supply Current | 170nA typ at 2.5V - enables multi-year operation on coin-cell batteries in portable medical devices. |
| Operating Voltage | 1.2V to 5.5V - supports single-cell Li-ion, 2xAA, or 3.3V/5V system rails with valid reset down to 1.1V. |
| Reset Output Type | Active-high push-pull - drives RESET high without external pullup; compatible with µP reset inputs requiring HI-active assertion. |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies manual reset implementation using a switch to GND. |
| Reset Delay (tRD) | 40µs max - guarantees fast response to VCC transients while rejecting sub-40µs noise spikes. |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during reset; sinks current when deasserted; no external pullup required. |
| 2 | GND | Ground reference for all internal circuitry and reset timing; must be connected to system ground plane. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); assert by pulling to GND for ≥1µs. |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in high-frequency environments. |
| 5 | VCC | Supply voltage input and monitored rail - powers the IC and serves as the voltage source for reset threshold detection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in always-on wearable health monitors. |
| VCC Immunity | Guaranteed reset validity down to VCC = 1.1V ensures reliable operation during deep brownout conditions. |
| No External Components | Integrated MR pullup and precision voltage reference eliminate need for external resistors or capacitors. |
| Transient Rejection | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents false resets in noisy power environments. |
| Small Footprint | 5-pin SOT23-5 (2.9mm × 1.6mm) saves PCB space in compact portable electronics designs. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous glucose sensing systems powered by CR2032 coin cells with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises VCC during battery discharge and sensor wake-up cycles; asserts active-high RESET to hold MCU until stable 3.0V rail is confirmed. Use Value: Prevents corrupted ADC readings or BLE packet loss caused by premature MCU boot during voltage sag. |
Use Scenario: Portable ECG patch with low-power ARM Cortex-M0+ MCU and analog front-end. IC Role / Device Role / Timing Role: Monitors 1.8V LDO output supplying the MCU core; provides 300ms reset hold time to ensure clock PLL lock and memory initialization. Use Value: Eliminates boot failures due to slow-ramping power rails in ultra-low-power clinical-grade wearables. |
| Smart Inhalers | Wireless Pulse Oximeters |
|
Use Scenario: Bluetooth-enabled metered-dose inhaler tracking usage via MEMS motion sensor and flash storage. IC Role / Device Role / Timing Role: Detects VCC drop below 2.700V during battery insertion or low-battery warning; initiates controlled shutdown sequence via MR-triggered reset. Use Value: Ensures data integrity in flash memory by preventing write operations during unstable supply conditions. |
Use Scenario: Single-use disposable pulse oximeter with photodiode array and red/IR LEDs powered by button cell. IC Role / Device Role / Timing Role: Provides active-high reset to TI MSP430F2xx MCU; leverages 170nA ICC to extend shelf life and operational runtime. Use Value: Meets IEC 60601-2-61 requirements for fail-safe power-on reset behavior in Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K27DBVR | 2.7V reset threshold, 200ms timeout, open-drain active-low output; 1.6µA ICC - 10× higher quiescent current than MAX6855UK27D5+T. | Requires external pullup resistor and level-shifting for active-high µP interfaces; unsuitable for <2µA battery budget designs. | Select only if open-drain flexibility and TI supply chain preference outweigh nanopower requirement. |
| ADM6805S27ARTZ-RL | 2.7V threshold, 240ms timeout, push-pull active-low output; 1.2µA ICC; operates down to 1.0V - slightly lower VCC limit but higher ICC. | Active-low output conflicts with µPs requiring active-high reset; requires board-level inversion or redesign. | Choose only when active-low reset is already implemented in existing layout and 1.2µA ICC is acceptable. |
Compared with TPS3837K27DBVR and ADM6805S27ARTZ-RL, the MAX6855UK27D5+T uniquely delivers 2.7V supervision with active-high push-pull output and true nanopower (170nA) operation - enabling direct interface to modern ultra-low-power MCUs without additional components or current overhead.
Availability
MAX6855UK27D5+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, smart inhalers, and wireless pulse oximeters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6855UK27D5+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, sensing, and interface applications in industrial, medical, and communications systems.
The MAX6854–MAX6869 family delivers nanopower supervisory functions for battery-critical portable electronics, emphasizing ultra-low ICC, wide VCC range, and guaranteed reset validity at sub-1.2V rails.
FAQ
What is the exact reset threshold voltage of the MAX6855UK27D5+T?
The MAX6855UK27D5+T has a factory-trimmed reset threshold of 2.700V with ±2.5% tolerance across -40°C to +85°C. This value is defined in Table 2 (Threshold Suffix Guide) where "27" corresponds to 2.700V nominal, and electrical characteristics confirm VTH = 2.700V ±2.5% under all operating conditions. The MAX6855UK27D5+T does not drift beyond this spec.
Does the MAX6855UK27D5+T include a watchdog timer function?
No, the MAX6855UK27D5+T does not include a watchdog timer. Per the Selector Guide and Pin Description, only MAX6864–MAX6869 variants feature WDI input; the MAX6855UK27D5+T is a voltage-monitoring + manual-reset IC with no watchdog circuitry, no WDI pin, and no watchdog timeout configuration.
What is the reset timeout period for the MAX6855UK27D5+T?
The MAX6855UK27D5+T has a 300ms minimum reset timeout period (D5 option), as indicated by the "D5" suffix. Electrical Characteristics specify tRP = 300ms (min), 450ms (typ), and 600ms (max) at VCC = VTH + 150mV. This ensures sufficient hold time for µP power stabilization and clock initialization.
Can the MAX6855UK27D5+T operate with VCC below 1.2V?
Yes - the MAX6855UK27D5+T guarantees valid reset operation down to VCC = 1.1V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.2V, the reset output remains functional, though sink/source capability degrades gradually; it is fully specified and tested at 1.1V.
What is the function of Pin 4 on the MAX6855UK27D5+T?
Pin 4 on the MAX6855UK27D5+T is a second GND terminal, electrically connected to Pin 2 internally. Its inclusion improves noise immunity and thermal performance in high-density layouts by providing dual ground paths - critical for stable reset timing in sensitive medical instrumentation.
MAX6855UK27D5+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:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK27D5+T FAQ
1.How can I place an order for MAX6855UK27D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK27D5+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 MAX6855UK27D5+T reliable?
The price and inventory of MAX6855UK27D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK27D5+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK27D5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK27D5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK27D5+T?
MAX6855UK27D5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK27D5+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 MAX6855UK27D5+T?
For technical support, including MAX6855UK27D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK27D5+T requirements.
6.How does Aetrix verify that MAX6855UK27D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK27D5+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 MAX6855UK27D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK27D5+T?
All MAX6855UK27D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK27D5+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 MAX6855UK27D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK27D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6855UK27D5+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
