My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6855UK28D1+T
- Part No.:
- MAX6855UK28D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK28D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,876
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6855UK28D1+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 2.800V reset threshold (suffix D1), and 10ms 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 portable systems.
For engineers reviewing the MAX6855UK28D1+T datasheet, MAX6855UK28D1+T pinout, MAX6855UK28D1+T application, or MAX6855UK28D1+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 configuration, and compatibility with low-voltage µP interfaces in space-constrained designs.
Technical Context
This device implements a precision voltage monitor with ±2.5% reset threshold tolerance over -40°C to +85°C, combined with a fixed 10ms reset timeout timer and MR-triggered reset assertion. Its internal 10kΩ MR pullup eliminates external components, and the push-pull active-high RESET output drives directly to VCC without requiring external biasing.
The MAX6855UK28D1+T belongs to the MAX6854–MAX6869 family but excludes watchdog timer (WDI) and CT-selectable timeout functionality - distinguishing it from MAX6864–MAX6869 and MAX6861–MAX6863 variants. It shares pinout and core supervision logic with MAX6854/MAX6856 but differs in RESET polarity and output type.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.800V (factory-trimmed, ±2.5% tolerance); ensures deterministic reset initiation during VCC brownout at precisely defined rail level |
| 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); guarantees sufficient µP hold time after VCC recovery before release |
| RESET Output Type | Push-pull active-high; provides rail-to-rail drive strength without external pullup, compatible with CMOS µP reset inputs |
| VCC Validity Range | RESET asserted valid down to VCC = +1.1V; supports robust reset behavior even during deep undervoltage conditions |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC; allows direct switch-to-GND implementation with no external resistor |
| Operating Temp | -40°C to +85°C; qualified for industrial and portable consumer environments without derating |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high when VCC ≥ 2.800V and MR is deasserted; sinks/source capability specified per VOL/VOH tables |
| 2, 4 | GND | Ground reference for all internal circuitry; must be connected to system ground plane for stable threshold and timing accuracy |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; 1µs minimum pulse width; rejects <200ns glitches |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for noise immunity and accurate threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors and wearables |
| No external components | Integrated MR pullup and precision voltage reference eliminate BOM count and layout area |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy power rails |
| Guaranteed RESET validity | RESET remains functional down to VCC = +1.1V, ensuring fail-safe behavior during deep brownout |
| SOT23-5 footprint | Industry-standard 5-pin package enables drop-in replacement and automated assembly compatibility |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 14 days on a single CR2032 cell. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to ARM Cortex-M0+ during cold start and low-battery brownout. Use Value: 170nA ICC extends battery life beyond clinical requirement; 2.800V threshold aligns with Li-ion discharge knee; 10ms timeout ensures full µP initialization. | Use Scenario: LoRaWAN soil moisture sensor deployed in remote fields with AA alkaline cells. IC Role / Device Role / Timing Role: Power-on supervisor holding µP in reset until regulated 3.3V rail stabilizes after boost converter startup. Use Value: Push-pull active-high RESET eliminates need for external pullup, reducing leakage paths; VCC = +1.1V validity ensures reset integrity during end-of-life battery sag. |
| Industrial Handheld Terminals | Low-Power Wearables |
Use Scenario: Ruggedized barcode scanner operating across -20°C to +70°C ambient with intermittent charging. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown and restart when 3.6V Li-ion drops below 2.800V. Use Value: ±2.5% VTH tolerance over temperature prevents false resets; MR pin enables hardware-initiated firmware update reset via front-panel button. | Use Scenario: ECG patch sampling biopotentials every 5 seconds, sleeping between measurements. IC Role / Device Role / Timing Role: Reset controller asserting active-high signal to ultra-low-power MSP430FR59xx during wake-up from LPM4.5. Use Value: 10ms minimum timeout accommodates slow clock stabilization; SOT23-5 footprint fits within 8mm × 8mm PCB area budget. |
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 threshold, 200ms timeout, open-drain active-low RESET, 1.6µA ICC | Requires external pullup; higher ICC limits battery life; suited for systems with 3.3V-only rails and legacy µP reset polarity | Select if board already uses TPS383x footprint and µP requires active-low reset; verify VTH alignment with system brownout point |
| MAX6361KA29D3+T | 2.93V threshold, 10ms timeout, push-pull active-low RESET, 1.2µA ICC | Same package but active-low output; higher ICC reduces battery runtime; lacks MR glitch rejection spec | Choose only if active-low RESET is mandatory and 2.93V threshold better matches system VDD tolerance stack-up |
Compared with TPS3836K33DBVR and MAX6361KA29D3+T, the MAX6855UK28D1+T delivers 7× lower supply current and precise 2.800V threshold - critical for long-life medical and sensor applications where µP reset polarity and ultra-low ICC dominate selection.
Availability
MAX6855UK28D1+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, industrial handheld terminals, and low-power wearables requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for MAX6855UK28D1+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6854–MAX6869 product line delivers nanopower supervisory circuits optimized for battery longevity and reliability in portable and implantable electronics - emphasizing ultra-low ICC, wide VCC validity, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK28D1+T?
The MAX6855UK28D1+T has a factory-trimmed reset threshold of 2.800V, 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 "28" corresponds to 2.800V nominal. The MAX6855UK28D1+T maintains this accuracy without calibration or external components.
Does the MAX6855UK28D1+T include a watchdog timer function?
No, the MAX6855UK28D1+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input; the MAX6855UK28D1+T belongs to the MAX6854/MAX6855/MAX6856 group, which supports voltage monitoring and manual reset only. Its pinout omits WDI, confirming absence of watchdog functionality.
What is the RESET output configuration of the MAX6855UK28D1+T?
MAX6855UK28D1+T features an active-high push-pull RESET output (Pin 1). Unlike open-drain or active-low variants, this configuration drives high when VCC exceeds 2.800V and MR is inactive, eliminating need for external pullup resistors. Electrical specs confirm VOH ≥ 0.8×VCC at ISOURCE = 500µA, validating true push-pull drive capability.
Can the MAX6855UK28D1+T operate reliably below 1.8V supply?
Yes - the MAX6855UK28D1+T guarantees RESET validity down to VCC = +1.1V, and its supply range is specified from 1.2V to 5.5V. At 1.2V, ICC remains only 190nA (typ), and reset assertion/deassertion timing remains functional. This makes MAX6855UK28D1+T suitable for single-cell LiFePO₄ or deeply discharged alkaline systems.
Is the MAX6855UK28D1+T pin-compatible with other devices in the MAX6854–MAX6869 family?
Yes, the MAX6855UK28D1+T uses the standard 5-pin SOT23-5 package shared across the MAX6854–MAX6869 family. Pin 1 is RESET, Pins 2/4 are GND, Pin 3 is MR, and Pin 5 is VCC - matching MAX6854, MAX6856, MAX6861–MAX6863, and MAX6864–MAX6869. However, output polarity (active-high vs. active-low) and presence of WDI/CT pins differ by variant, so electrical interface must be verified.
MAX6855UK28D1+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:
- 2.8V
- 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
MAX6855UK28D1+T FAQ
1.How can I place an order for MAX6855UK28D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK28D1+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 MAX6855UK28D1+T reliable?
The price and inventory of MAX6855UK28D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK28D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK28D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK28D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK28D1+T?
MAX6855UK28D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK28D1+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 MAX6855UK28D1+T?
For technical support, including MAX6855UK28D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK28D1+T requirements.
6.How does Aetrix verify that MAX6855UK28D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK28D1+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 MAX6855UK28D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK28D1+T?
All MAX6855UK28D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK28D1+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 MAX6855UK28D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK28D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6855UK28D1+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…
