My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6855UK22D1+T
- Part No.:
- MAX6855UK22D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK22D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,615
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6855UK22D1+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 2.235V reset threshold (suffix "22"), and 10ms minimum reset timeout (suffix "D1"). It provides active-high push-pull RESET output, manual reset input (MR), and operates across –40°C to +85°C for reliable power-up/brownout monitoring in battery-critical systems.
For engineers reviewing the MAX6855UK22D1+T datasheet, MAX6855UK22D1+T pinout, MAX6855UK22D1+T application, or MAX6855UK22D1+T equivalent, this device serves as a low-quiescent-current voltage monitor with deterministic reset timing and MR-initiated recovery - essential for portable medical sensors, wearables, and energy-harvesting endpoints where supply stability and reset validity down to VCC = 1.1V are mandatory.
Technical Context
The MAX6855UK22D1+T implements a precision bandgap-based voltage comparator with 2.5% threshold accuracy over temperature, coupled to a monolithic RC timer for fixed 10ms reset assertion after VCC recovery or MR deassertion. Its active-high push-pull RESET output is referenced to VCC and guarantees valid logic levels down to VCC = 1.1V.
No watchdog timer or CT pin is present - per Selector Guide and Pin Description, MAX6855 variants lack WDI and CT functionality and exclusively support MR-triggered and VCC-fall-triggered reset assertion. The internal 10kΩ MR pullup ensures robust noise immunity without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.235V (factory-trimmed, ±2.5% over –40°C to +85°C) - sets precise brownout detection point for 2.5V/3.3V rail monitoring |
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries in always-on monitoring applications |
| Reset Timeout | 10ms minimum (D1 option) - ensures µP reset pulse exceeds minimum processor reset hold time requirements |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and interfaces directly with CMOS µP reset inputs |
| VCC Validity Range | Guaranteed RESET validity down to VCC = 1.1V - supports reset assertion during deep brownout conditions before system collapse |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC - allows direct switch-to-GND implementation without external biasing |
| Operating Temp | –40°C to +85°C - qualified for industrial and portable medical environments including patient monitors |
Pinout & Package
Package: 5-pin SOT23-5 (lead-free, +T suffix), 2.9mm × 1.6mm footprint, 1.1mm height - compatible with high-density PCB layouts and automated assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin high during fault; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold reference |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; momentary GND connection initiates system reset |
| 4 | GND | Second ground terminal - improves noise immunity and thermal dissipation in SOT23 package |
| 5 | VCC | Supply voltage input - monitored rail; requires 0.1µF bypass capacitor to GND for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in glucose monitors and wearable ECG sensors beyond 5 years |
| Reset threshold accuracy | ±2.5% over full temperature range - eliminates need for external calibration in field-deployed devices |
| No external components | Integrated MR pullup, precision reference, and timing - reduces BOM count and layout area vs. discrete solutions |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in electrically noisy portable equipment |
| Valid RESET at low VCC | Guaranteed operation down to VCC = 1.1V - ensures fail-safe reset assertion during critical brownout recovery |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission and low-power MCU sleep/wake cycles. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to ARM Cortex-M0+ during VCC brownout or user-initiated recalibration. Use Value: 170nA quiescent current preserves CR2032 battery life >3 years; 2.235V threshold matches 2.5V analog front-end rail tolerance. |
Use Scenario: Portable vital signs monitor with ECG, SpO₂, and temperature acquisition running on rechargeable Li-ion. IC Role / Device Role / Timing Role: Voltage supervisor ensuring deterministic MCU reset during battery voltage sag under pulse oximetry LED load switching. Use Value: 10ms reset timeout satisfies ARM reset hold-time spec; VCC = 1.1V validity prevents lockup during deep discharge. |
| MP3 Players | PDAs |
Use Scenario: Flash-based audio player with SD card interface and headphone amplifier, powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Reset generator triggered by VCC drop below 2.235V during battery depletion or USB disconnect. Use Value: Push-pull active-high RESET directly drives baseband processor reset pin without level-shifting components. |
Use Scenario: Legacy PDA with MMC/SD host controller, touchscreen controller, and RF transceiver operating from 3.3V rail. IC Role / Device Role / Timing Role: Supervisory circuit providing MR-initiated reset via stylus button and brownout protection during hot-swap battery replacement. Use Value: Internal 10kΩ MR pullup eliminates discrete resistor; SOT23-5 footprint fits tight space constraints near connector. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K22DBVR | 2.2V threshold, 200ms min timeout, open-drain RESET, 1.2µA ICC | Higher supply current limits battery lifetime; open-drain requires pullup for active-high logic | Select only if longer timeout or TI ecosystem alignment outweighs 7× higher ICC and added component count |
| MAX6315US22D1+T | Same 2.235V threshold and 10ms timeout, but push-pull active-low RESET output | Requires inverter or µP with active-low reset input; identical quiescent current and package | Choose when existing design uses active-low reset architecture and board layout cannot accommodate signal inversion |
Compared with TPS3837K22DBVR and MAX6315US22D1+T, the MAX6855UK22D1+T delivers the lowest ICC (170nA vs. 1.2µA or 1.1µA), native active-high push-pull output eliminating external components, and tighter threshold accuracy - making it optimal for multi-year battery-powered medical and audio endpoints.
Availability
MAX6855UK22D1+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and MP3 players requiring stable component supply with guaranteed long-term manufacturability and lead-free compliance.
Supply support for MAX6855UK22D1+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 consumer systems.
The MAX6854–MAX6869 family targets ultra-low-power supervisory functions in battery-constrained devices, emphasizing nanopower operation, factory-trimmed thresholds, and minimal external component count for rapid, reliable system reset control.
FAQ
What is the exact reset threshold voltage of the MAX6855UK22D1+T?
The MAX6855UK22D1+T has a factory-trimmed reset threshold of 2.235V, with ±2.5% tolerance over –40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "22" corresponds to 2.235V nominal. The MAX6855UK22D1+T uses this precise threshold to monitor 2.5V rails in portable medical and audio devices without external calibration.
Does the MAX6855UK22D1+T include a watchdog timer function?
No, the MAX6855UK22D1+T does not include a watchdog timer. Per the Selector Guide and Pin Description section, MAX6855 variants support only VCC monitoring and manual reset (MR) - they lack the WDI pin and associated watchdog circuitry found in MAX6864–MAX6869 devices. The MAX6855UK22D1+T relies solely on voltage supervision and MR input for reset generation.
What is the function of Pin 1 and Pin 4 on the MAX6855UK22D1+T?
Pin 1 is the active-high push-pull RESET output, which drives high during reset assertion and low otherwise. Pin 4 is a second GND terminal - both GND pins (2 and 4) must be connected to the same system ground plane to ensure stable reference and thermal performance. This dual-GND configuration improves noise immunity in the 5-pin SOT23 package of the MAX6855UK22D1+T.
Can the MAX6855UK22D1+T operate with supply voltages below 1.8V?
Yes, the MAX6855UK22D1+T operates with VCC as low as 1.2V (minimum specified) and guarantees valid RESET output down to VCC = 1.1V. Electrical Characteristics confirm functionality at 1.2V, and the "Guaranteed Reset Valid to VCC = +1.1V" feature ensures deterministic reset behavior during deep brownout - a key capability for the MAX6855UK22D1+T in single-cell Li-ion and coin-cell applications.
Is the MAX6855UK22D1+T pin-compatible with other devices in the MAX6854–MAX6869 family?
The MAX6855UK22D1+T shares the same 5-pin SOT23-5 package and pinout (RESET, GND, MR, GND, VCC) with MAX6854, MAX6856, MAX6861–MAX6863, and MAX6864–MAX6869 variants. However, functional pin assignments differ: MAX6855 uses Pin 1 for active-high RESET, while MAX6854 uses Pin 1 for active-low RESET or open-drain. Thus, physical pin compatibility exists, but electrical interface must be verified per variant - especially for RESET polarity and presence of WDI/CT pins.
MAX6855UK22D1+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:
- 2.188V
- 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
MAX6855UK22D1+T FAQ
1.How can I place an order for MAX6855UK22D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK22D1+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 MAX6855UK22D1+T reliable?
The price and inventory of MAX6855UK22D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK22D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK22D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK22D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK22D1+T?
MAX6855UK22D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK22D1+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 MAX6855UK22D1+T?
For technical support, including MAX6855UK22D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK22D1+T requirements.
6.How does Aetrix verify that MAX6855UK22D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK22D1+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 MAX6855UK22D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK22D1+T?
All MAX6855UK22D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK22D1+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 MAX6855UK22D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK22D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6855UK22D1+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…
