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Analog Devices Inc./Maxim Integrated MAX6306UK28D3+T
- Part No.:
- MAX6306UK28D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6306UK28D3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,928
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Product details
Overview
MAX6306UK28D3+T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC supply voltage and provides a push/pull active-low reset output. It features a factory-set 2.8V reset threshold (±2.5% over temperature), 140ms minimum reset timeout, manual reset input (MR), and guaranteed RESET assertion down to VCC = 1V. Used in multivoltage embedded systems for reliable power-on and brownout reset generation.
For engineers reviewing the MAX6306UK28D3+T datasheet, MAX6306UK28D3+T pinout, MAX6306UK28D3+T application, or MAX6306UK28D3+T equivalent, key selection criteria include its 2.8V VCC monitoring threshold, 140ms factory-programmed timeout, MR input compatibility with TTL/CMOS logic, immunity to fast VCC transients, and guaranteed operation across 0°C to +70°C.
Technical Context
The MAX6306UK28D3+T uses an internal factory-trimmed resistor divider to monitor VCC against a precision 2.8V threshold, with ±2.5% tolerance over full temperature range. Its reset generator asserts active-low RESET for ≥140ms after all monitored supplies stabilize above threshold.
This device integrates a manual-reset input (MR) with internal 63.5kΩ pull-up, supporting direct switch connection or logic-level assertion. It ignores short-duration negative VCC transients - up to ~200µs at 2.8V overdrive - and guarantees valid RESET output down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.8V nominal, ±2.5% over -40°C to +85°C - sets precise undervoltage detection point for 3.3V systems |
| Reset Timeout Period | 140ms minimum - ensures µP reset pulse meets typical boot initialization timing requirements |
| Supply Current | 8µA typical at +25°C - enables battery-powered and low-power portable designs |
| Operating Temperature | 0°C to +70°C - suitable for commercial-grade embedded control and computing applications |
| RESET Output Type | Push/pull active-low - drives reset line directly without external pull-up; sinks 3.2mA at VCC > 4.25V |
| MR Input Logic Levels | VIL ≤ 0.8V, VIH ≥ 0.7×VCC - compatible with 3.3V CMOS and 5V TTL logic sources |
| Guaranteed RESET Validity | Valid down to VCC = 1V - ensures deterministic reset behavior during deep brownout conditions |
Pinout & Package
MAX6306UK28D3+T is housed in a lead-free 5-pin SOT23 package (package code U5+1), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads optimized for automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Drives microprocessor reset pin directly; sinks 3.2mA at VCC > 4.25V; no external pull-up required |
| 2 - GND | System ground reference | Return path for internal comparators, reset generator, and MR input; must be low-impedance |
| 3 - RST IN | Adjustable undervoltage reset input | Monitors secondary supply via external resistor divider; asserts reset when input falls below 1.23V threshold |
| 4 - MR | Manual reset input | Pull low to force system reset; internal 63.5kΩ pull-up allows switch-to-ground interface without external components |
| 5 - VCC | Main supply input and monitored rail | Power source and primary voltage monitor; device operates from 2.5V to 5.5V, monitors itself at 2.8V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 2.8V threshold | Eliminates external resistor network for VCC monitoring - reduces BOM count and layout area |
| 140ms minimum reset timeout | Meets JEDEC JESD78 and common µP reset hold-time requirements without external timing components |
| Immunity to fast VCC transients | Rejects <200µs negative glitches at 2.8V overdrive - prevents spurious resets in noisy power environments |
| Manual reset input with internal pull-up | Enables momentary switch interface without external resistor - simplifies front-panel or debug reset implementation |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset assertion during severe brownout - critical for fail-safe embedded control |
Applications
| Industrial PLC I/O Module | Medical Patient Monitor |
|---|---|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted I/O modules with dual 5V/24V supplies. IC Role / Device Role / Timing Role: Primary VCC supervisor for 5V logic rail; asserts reset on 5V brownout while enabling secondary monitoring of 24V field power via RST IN. Use Value: Prevents firmware corruption during industrial power fluctuations; 140ms timeout aligns with FPGA configuration time. |
Use Scenario: Battery-backed vital signs acquisition unit requiring fail-safe restart after low-battery shutdown. IC Role / Device Role / Timing Role: Monitors main 3.3V supply derived from Li-ion battery; MR input supports clinician-initiated soft reset without power cycle. Use Value: 8µA quiescent current extends battery life; guaranteed RESET down to VCC = 1V ensures reset validity during final battery discharge phase. |
| Network Router Control Board | Automotive Infotainment Head Unit |
Use Scenario: Multirail power management on router CPU board with 1.2V core, 3.3V I/O, and 5V USB supplies. IC Role / Device Role / Timing Role: Supervises 3.3V I/O rail; RST IN monitors 5V USB supply; MR input interfaces with system watchdog MCU. Use Value: Dual-supply monitoring avoids false resets during USB hot-plug events; transient immunity prevents glitches from switching regulator noise. |
Use Scenario: Cold-cranking and load-dump tolerant infotainment system powered from 12V automotive battery. IC Role / Device Role / Timing Role: Monitors 3.3V domain derived from buck converter; MR input tied to ignition signal for cold-start reset synchronization. Use Value: 2.8V threshold matches 3.3V rail dropout margin; 0°C to +70°C rating covers cabin temperature range; lead-free +T suffix complies with automotive RoHS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6306UK28D2+T | 20ms minimum reset timeout vs. 140ms | Shorter reset pulse; suited for fast-boot µPs or systems with tight timing budgets | Select when faster release from reset is required and 20ms meets µP tRST specification |
| TPS3808G33DBVR | 2.93V fixed threshold, 200ms timeout, 1.8–6V VCC range, 2.5µA ICC | Higher threshold and longer timeout; lower supply current; wider VCC range | Prefer for ultra-low-power applications or where 2.93V threshold better matches 3.3V rail tolerance |
Compared with MAX6306UK28D2+T and TPS3808G33DBVR, the MAX6306UK28D3+T offers a balanced trade-off of mid-range timeout (140ms), precise 2.8V threshold for 3.3V systems, and proven transient immunity - making it optimal for general-purpose embedded reset supervision where reliability under brownout and noise is prioritized.
Availability
MAX6306UK28D3+T is available at Aetrix Electronics and suitable for industrial PLCs, medical patient monitors, network routers, and automotive infotainment head units requiring stable component supply and long-term production continuity.
Supply support for MAX6306UK28D3+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, computing, and communications markets.
The MAX6305–MAX6313 family was engineered specifically for multivoltage microprocessor supervision - delivering factory-programmable thresholds, multiple reset inputs, and robust transient immunity in minimal SOT23 packaging.
FAQ
What is the exact reset threshold voltage for MAX6306UK28D3+T?
The MAX6306UK28D3+T has a factory-trimmed nominal reset threshold of 2.8V, with ±2.5% tolerance over the full operating temperature range of 0°C to +70°C. This value is set by an internal precision resistor divider and is confirmed in the Electrical Characteristics table of the official datasheet (Rev 6, page 2). The 2.8V threshold is optimized for reliable supervision of standard 3.3V logic rails.
Does MAX6306UK28D3+T support manual reset functionality?
Yes, MAX6306UK28D3+T includes a dedicated MR (manual reset) input on pin 4. A logic-low pulse ≥1.5µs asserts RESET for the full timeout period (140ms min). The pin features an internal 63.5kΩ pull-up resistor, allowing direct connection to a normally-open momentary switch tied to GND - no external components are needed. MR accepts TTL/CMOS logic levels depending on VCC.
What is the reset timeout duration for MAX6306UK28D3+T?
The MAX6306UK28D3+T provides a factory-programmed minimum reset timeout of 140ms, denoted by the "D3" suffix in the part number. This value is guaranteed across temperature and process variation, and is designed to exceed typical microprocessor reset-hold requirements per JEDEC JESD78. The actual timeout may vary slightly but remains ≥140ms under all specified conditions.
Can MAX6306UK28D3+T monitor voltages other than VCC?
Yes, MAX6306UK28D3+T includes an adjustable RST IN input (pin 3) that can monitor a secondary supply using an external resistor divider. The internal comparator references 1.23V, so a custom threshold (e.g., 5V or 12V) is set by selecting R1/R2 values per the formula VTH = ((R1+R2)/R2) × 1.23V. This enables dual-supply supervision - for example, monitoring both 3.3V (via VCC) and 5V (via RST IN) rails simultaneously.
Is MAX6306UK28D3+T compatible with 3.3V and 5V systems?
Yes, MAX6306UK28D3+T operates from VCC = 2.5V to 5.5V and is explicitly designed for multivoltage systems including 3.3V/5V combinations. Its 2.8V reset threshold targets 3.3V rails with appropriate margin, while the MR input adapts to 3.3V CMOS (VIH ≥ 0.7×VCC) or 5V TTL (VIH ≥ 2.4V) logic. The push/pull RESET output drives cleanly across this range, sinking 3.2mA at VCC > 4.25V and 1.2mA at VCC > 2.5V.
MAX6306UK28D3+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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.8V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6306UK28D3+T FAQ
1.How can I place an order for MAX6306UK28D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6306UK28D3+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 MAX6306UK28D3+T reliable?
The price and inventory of MAX6306UK28D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6306UK28D3+T is usually 5 days.
3.What payment methods are accepted for MAX6306UK28D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6306UK28D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6306UK28D3+T?
MAX6306UK28D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6306UK28D3+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 MAX6306UK28D3+T?
For technical support, including MAX6306UK28D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6306UK28D3+T requirements.
6.How does Aetrix verify that MAX6306UK28D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6306UK28D3+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 MAX6306UK28D3+T meets industry standards.
7.What is the process for return or replacement of MAX6306UK28D3+T?
All MAX6306UK28D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6306UK28D3+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 MAX6306UK28D3+T part is unused and in its original packaging.
Return procedure for MAX6306UK28D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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