My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6855UK30D3+T
- Part No.:
- MAX6855UK30D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK30D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,866
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6855UK30D3+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 a fixed 300ms minimum reset timeout period. It monitors VCC with a factory-trimmed 3.000V reset threshold (±2.5%), asserts reset down to VCC = +1.1V, and draws only 170nA typical supply current - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6855UK30D3+T datasheet, MAX6855UK30D3+T pinout, MAX6855UK30D3+T application, or MAX6855UK30D3+T equivalent, key selection criteria include its 3.0V threshold accuracy, guaranteed reset validity at low VCC, immunity to short VCC transients (<40µs at 100mV overdrive), and compatibility with CMOS-level MR signaling without external pullup.
Technical Context
This device implements a precision voltage monitor with hysteresis (0.5% of VTH) and a monolithic reset timeout generator. Its internal 10kΩ MR pullup enables direct connection to momentary switches or open-drain logic, eliminating external components. The active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load when asserted.
No watchdog timer or CT pin is present - the MAX6855UK30D3+T belongs to the base supervisory subset (no WDI, no timeout select). It operates across -40°C to +85°C and guarantees functional reset assertion even as VCC falls through 1.1V, supporting reliable brownout recovery in ultra-low-power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.000V ±2.5% - precise brownout detection point for 3.3V systems with margin |
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries |
| Reset Timeout | 150ms min / 300ms typ - ensures µP initialization completes before release |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, 2xAA, and 3.3V/5V rails |
| Reset Valid Down To | VCC = +1.1V - maintains deterministic reset state during deep brownout |
| MR Input Logic | Active-low, internally pulled up to VCC (10kΩ) - accepts CMOS or switch inputs without external bias |
| RESET Output Type | Push-pull active-high - drives µP reset pin directly; no external pullup required |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin high during fault; no external pullup needed |
| 2 | GND | Ground reference - must be connected to system ground plane for noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; assert low ≥1µs to trigger reset |
| 4 | GND | Second ground terminal - electrically tied to Pin 2; improves thermal dissipation and noise rejection |
| 5 | VCC | Supply voltage input - monitored rail; bypass with 0.1µF ceramic capacitor to GND for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in always-on medical sensors |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C - eliminates need for external trimming in production |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in noisy environments |
| No external components | Integrated MR pullup (10kΩ) and precision voltage reference - reduces BOM count and PCB area |
| Low-VCC reset guarantee | Valid RESET assertion down to VCC = +1.1V - ensures robust power-fail response in deep brownout |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 7–14 days on single CR2032 cell. IC Role / Device Role / Timing Role: Supervises 3.0V regulated rail; triggers hard reset on battery sag below 3.0V to prevent corrupted sensor calibration data. Use Value: 170nA ICC extends usable battery life by >12% vs. comparable supervisors; 300ms timeout ensures ADC and BLE radio initialize fully before firmware launch. |
Use Scenario: Portable ECG/SpO₂ logger capturing 24-hour patient data in clinical home settings. IC Role / Device Role / Timing Role: Monitors main 3.3V supply; asserts active-high RESET to ARM Cortex-M0+ upon undervoltage, enabling safe shutdown and nonvolatile memory write completion. Use Value: Guaranteed reset validity to 1.1V prevents MCU lockup during battery swap; MR pin allows clinician-initiated recalibration via tactile button. |
| Smart Hearing Aids | Wearable Fitness Trackers |
Use Scenario: Rechargeable hearing aid with dual-cell LiPo (3.6V nominal) and ultra-low-power DSP. IC Role / Device Role / Timing Role: Detects 3.0V brownout during high-current audio processing bursts; holds DSP in reset until stable supply returns. Use Value: 0.5% VTH hysteresis prevents oscillation near threshold; push-pull RESET eliminates pullup resistor, saving 0.2mm² PCB area per unit. |
Use Scenario: Waterproof fitness band powered by 120mAh LiPo, requiring 2-year shelf life and instant wake-on-motion. IC Role / Device Role / Timing Role: Supervises 3.0V LDO output; initiates controlled boot sequence after button-press MR event or power-up. Use Value: Internal 10kΩ MR pullup removes external component; 150ms min timeout accommodates slow-crystal startup in real-time clock subsystem. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.08V threshold (±0.5%), 200ms timeout, open-drain active-low RESET | Requires external pullup; less accurate threshold but tighter tolerance; lower ICC (120nA) | Choose for cost-sensitive, low-noise 3.3V systems where active-low reset polarity is acceptable |
| MAX6315US30D3+ | 3.0V threshold (±2.0%), 200ms timeout, push-pull active-low RESET, -40°C to +125°C rating | Higher temperature grade; active-low output requires level-shifting for µPs with active-high reset pins | Choose for automotive or industrial environments exceeding +85°C ambient |
Compared with TPS3837K33DBVR and MAX6315US30D3+, the MAX6855UK30D3+T uniquely delivers active-high push-pull RESET with no external components while maintaining 170nA ICC and 3.000V ±2.5% threshold - optimizing for space-, power-, and BOM-constrained portable medical designs.
Availability
MAX6855UK30D3+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and smart hearing aids requiring stable component supply with long-term lifecycle support and traceable sourcing.
Supply support for MAX6855UK30D3+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 management, sensing, and interface applications in industrial, medical, and communications markets.
The MAX685x family targets ultra-low-power microprocessor supervision in battery-critical portable equipment, emphasizing nanopower operation, guaranteed low-VCC reset validity, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK30D3+T?
The MAX6855UK30D3+T has a factory-trimmed reset threshold of 3.000V 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 "30" corresponds to 3.000V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for brownout protection in 3.3V systems with significant supply droop.
Does the MAX6855UK30D3+T include a watchdog timer?
No, the MAX6855UK30D3+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 base series, which provides only voltage monitoring and manual reset functionality. Watchdog capability is exclusive to the MAX6864–MAX6869 variants (e.g., MAX6864UK30D3S+T), identifiable by the "S" or "L" suffix in the ordering code. The MAX6855UK30D3+T pinout lacks a WDI terminal.
What is the function of Pin 4 on the MAX6855UK30D3+T?
Pin 4 on the MAX6855UK30D3+T is a second GND terminal, electrically connected to Pin 2. This dual-ground configuration improves thermal performance and reduces ground impedance in high-noise portable applications. It must be soldered to the PCB ground plane - leaving it floating degrades noise immunity and may cause erratic reset behavior during transient events.
Can the MAX6855UK30D3+T drive a microcontroller reset pin directly?
Yes, the MAX6855UK30D3+T can drive a microcontroller reset pin directly via its active-high push-pull RESET output (Pin 1). Unlike open-drain supervisors, it requires no external pullup resistor. When asserted, RESET outputs a logic high referenced to VCC; when deasserted, it drives low. This matches the active-high reset input requirements of many modern MCUs, including STM32L4 and nRF52 series.
What is the minimum pulse width required on the MR pin to trigger reset in the MAX6855UK30D3+T?
According to the Electrical Characteristics table, the MR minimum pulse width for the MAX6855UK30D3+T is 1µs. The device also provides 200ns glitch rejection, meaning brief noise spikes shorter than 200ns on the MR line will not cause unintended reset assertion. For reliable manual reset initiation, a clean low pulse ≥1µs duration applied to Pin 3 is sufficient - compatible with standard tactile switches and GPIO-driven reset circuits.
MAX6855UK30D3+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:
- 3V
- 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
MAX6855UK30D3+T FAQ
1.How can I place an order for MAX6855UK30D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK30D3+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 MAX6855UK30D3+T reliable?
The price and inventory of MAX6855UK30D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK30D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK30D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK30D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK30D3+T?
MAX6855UK30D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK30D3+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 MAX6855UK30D3+T?
For technical support, including MAX6855UK30D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK30D3+T requirements.
6.How does Aetrix verify that MAX6855UK30D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK30D3+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 MAX6855UK30D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK30D3+T?
All MAX6855UK30D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK30D3+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 MAX6855UK30D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK30D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6855UK30D3+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…
