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Analog Devices Inc./Maxim Integrated MAX6306UK25D3-T
- Part No.:
- MAX6306UK25D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6306UK25D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX6306UK25D3-T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC for undervoltage conditions and asserts an active-low push/pull RESET signal when the supply falls below its factory-set 2.5V threshold. It features a 140ms (min) reset timeout, manual reset input (MR), and guaranteed RESET validity down to VCC = 1V. Designed for multivoltage embedded systems, it ensures reliable microprocessor reset during power-up, brownout, or transient events in portable computers and intelligent instruments.
For engineers reviewing the MAX6306UK25D3-T datasheet, MAX6306UK25D3-T pinout, MAX6306UK25D3-T application, or MAX6306UK25D3-T equivalent, key selection criteria include its 2.5V ±2.5% reset threshold over temperature, 8µA supply current, immunity to fast VCC transients, and compatibility with 3.3V/5V dual-rail systems requiring deterministic reset timing and manual intervention capability.
Technical Context
The MAX6306UK25D3-T uses an internal factory-trimmed resistor divider to monitor VCC against a precision 2.5V threshold, with ±2.5% tolerance over –40°C to +85°C. Its reset assertion is synchronized to VCC crossing the threshold and held for a factory-programmed minimum 140ms timeout after all monitored supplies stabilize.
It integrates a manual-reset input (MR) with internal 63.5kΩ pull-up, TTL/CMOS-compatible logic thresholds, and glitch rejection of ≤0.1µs. The push/pull RESET output sinks ≥1.2mA at VCC > 2.5V and sources ≥500µA, eliminating external pull-up requirements while maintaining valid logic levels down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.5V ±2.5% over –40°C to +85°C - sets precise undervoltage detection point for 3.3V systems without external components |
| Reset Timeout Period | 140ms (min) - ensures µP remains held in reset long enough for stable clock and supply settling before release |
| Supply Current | 8µA (typ) at VCC = 5.5V - enables battery-powered operation with minimal quiescent drain |
| RESET Output Type | Active-low push/pull - drives low/high actively; no external pull-up needed; compatible with bidirectional µP reset pins |
| MR Input Logic | TTL/CMOS-compatible with 0.3×VCC VIH/0.8V VIL - supports direct interface to 3.3V or 5V logic without level shifting |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade industrial and computing applications |
| VCC Range | 2.525V to +5.5V - supports monitoring of 3.3V rails while tolerating 5V system supplies |
Pinout & Package
Package: 5-pin SOT23 (U5+1), 1.6mm × 2.9mm footprint, lead-free RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Drives low to assert reset; sources current to release; valid down to VCC = 1V; no external pull-up required |
| 2 - GND | System ground reference | Return path for internal comparators, MR input, and RESET driver; must be low-impedance connection |
| 3 - RST IN | Adjustable undervoltage reset input | Monitors external voltage via resistor divider; asserts reset when input falls below 1.23V reference |
| 4 - MR | Manual reset input | Pull low to force reset; internal 63.5kΩ pull-up allows NC or VCC tie; 1.5µs min pulse width required |
| 5 - VCC | Primary supply input and monitored rail | Power source and monitored voltage; internal trimmed divider sets 2.5V reset threshold; operates down to 2.525V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 2.5V threshold | Eliminates external resistor network; ±2.5% accuracy over full temperature range ensures consistent trip point in 3.3V systems |
| 140ms minimum reset timeout | Guarantees µP reset hold time exceeds typical oscillator start-up and power-supply stabilization delays |
| Push/pull RESET output | Removes dependency on external pull-up resistors; reduces BOM count and PCB area in space-constrained designs |
| Immunity to short VCC transients | Rejects glitches ≤0.1µs duration - prevents spurious resets during switching noise or ESD events |
| Manual reset with internal pull-up | Enables momentary switch interface without external biasing; simplifies front-panel or debug reset implementation |
Applications
| Portable Computers | Intelligent Instruments |
|---|---|
Use Scenario: Power management in clamshell laptops with dual 3.3V/5V rails and battery-backed real-time clocks. IC Role / Device Role / Timing Role: Monitors 3.3V core supply and asserts RESET if voltage sags below 2.5V during sleep/wake transitions. Use Value: Prevents firmware corruption by ensuring CPU reset occurs before 3.3V rail recovers to valid operating range. |
Use Scenario: Calibration-critical handheld test equipment powered by Li-ion batteries with variable discharge profiles. IC Role / Device Role / Timing Role: Supervises main 3.3V supply and triggers controlled shutdown/reset when battery drops near end-of-life (2.5V threshold). Use Value: Maintains measurement integrity by halting acquisition before analog front-end bias voltages drift out of spec. |
| Embedded Control Systems | Multivoltage Industrial Controllers |
Use Scenario: PLC I/O modules with isolated 3.3V logic and 24V field-side power, requiring deterministic boot sequencing. IC Role / Device Role / Timing Role: Generates 140ms reset pulse synchronized to 3.3V rail stabilization, enabling safe FPGA configuration load. Use Value: Eliminates race conditions between power-good signals and configuration clocks in Xilinx Spartan-6-based controllers. |
Use Scenario: Motor drive control boards with 5V logic, 3.3V MCU, and 12V gate drivers sharing common ground. IC Role / Device Role / Timing Role: Monitors 3.3V MCU supply only; ignores 5V/12V transients via internal hysteresis and glitch rejection. Use Value: Avoids false resets caused by switching noise on higher-voltage rails while protecting sensitive 3.3V logic domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6306UK25D2-T | Same 2.5V threshold but 20ms (min) reset timeout - shorter hold time than D3's 140ms | Suitable for µPs with faster clock startup (e.g., ARM Cortex-M0); insufficient for oscillators requiring >100ms stabilization | Select D2 only if system timing budget permits shorter reset assertion; verify µP datasheet tRESET requirement |
| TPS3808G125DBVR | 2.5V threshold, 200ms (typ) timeout, 1.8µA ICC, SOT23-6 package - lower current but different pinout and extra EN pin | Requires PCB redesign due to 6-pin layout and enable functionality not present in MAX6306UK25D3-T | Choose TPS3808G125DBVR only for ultra-low-power designs where 8µA vs. 1.8µA matters and layout change is acceptable |
Compared with MAX6306UK25D2-T and TPS3808G125DBVR, the MAX6306UK25D3-T uniquely balances 140ms deterministic reset hold time, push/pull output convenience, and proven transient immunity in compact 5-pin SOT23 - making it optimal for cost-sensitive, space-constrained 3.3V embedded systems needing manual reset capability.
Availability
The MAX6306UK25D3-T is available at Aetrix Electronics and suitable for portable computers, intelligent instruments, and embedded control systems requiring stable component supply across commercial temperature ranges and long production lifecycles.
Supply support for MAX6306UK25D3-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space-constrained, battery-sensitive applications - delivering precision reset thresholds, low quiescent current, and robust transient immunity in 5-pin SOT23 packages.
FAQ
What is the exact reset threshold voltage for MAX6306UK25D3-T and how tightly is it specified?
The MAX6306UK25D3-T has a factory-programmed nominal reset threshold of 2.5V, with a guaranteed tolerance of ±2.5% over the full operating temperature range of 0°C to +70°C. This means the actual trip point falls between 2.4375V and 2.5625V under worst-case conditions - sufficient for reliable supervision of standard 3.3V supplies where dropout below ~2.5V indicates failure.
Does MAX6306UK25D3-T require external components to function as a basic VCC supervisor?
No, the MAX6306UK25D3-T requires no external components for basic VCC supervision. Its 2.5V reset threshold is factory-trimmed into an internal resistor divider, and the 140ms reset timeout is programmed internally. Only decoupling capacitance (recommended 0.1µF near VCC/GND) and optional MR pull-down switch are needed - enabling minimal BOM count and rapid integration.
How does the manual reset (MR) input behave on MAX6306UK25D3-T during power-up?
The MR input on MAX6306UK25D3-T features an internal 63.5kΩ pull-up resistor, so it defaults to logic high at power-up - preventing unintended reset assertion. When pulled low (e.g., via momentary switch to GND), it forces RESET active immediately and holds it asserted for the full 140ms timeout after MR returns high. This behavior is fully functional even if VCC is below nominal, as long as it exceeds 2.525V.
Can MAX6306UK25D3-T monitor voltages other than VCC?
Yes, the MAX6306UK25D3-T includes a dedicated RST IN pin that accepts an externally divided voltage. By connecting a resistor divider from a secondary supply (e.g., 12V or 5V rail) to RST IN and GND, the device can assert reset when that supply falls below a user-defined threshold - while still independently monitoring VCC at 2.5V. This enables dual-rail supervision in a single 5-pin IC.
What is the guaranteed operating VCC range for MAX6306UK25D3-T?
The MAX6306UK25D3-T is guaranteed to operate with VCC between 2.525V and +5.5V. The lower limit derives from the 2.5V threshold plus 1% margin (2.5V × 1.01 = 2.525V), ensuring accurate comparison; the upper limit aligns with absolute maximum ratings. Operation below 2.525V may result in undefined reset behavior, though RESET remains valid down to VCC = 1V once asserted.
MAX6306UK25D3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.5V
- 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
MAX6306UK25D3-T FAQ
1.How can I place an order for MAX6306UK25D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6306UK25D3-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 MAX6306UK25D3-T reliable?
The price and inventory of MAX6306UK25D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6306UK25D3-T is usually 5 days.
3.What payment methods are accepted for MAX6306UK25D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6306UK25D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6306UK25D3-T?
MAX6306UK25D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6306UK25D3-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 MAX6306UK25D3-T?
For technical support, including MAX6306UK25D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6306UK25D3-T requirements.
6.How does Aetrix verify that MAX6306UK25D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6306UK25D3-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 MAX6306UK25D3-T meets industry standards.
7.What is the process for return or replacement of MAX6306UK25D3-T?
All MAX6306UK25D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6306UK25D3-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 MAX6306UK25D3-T part is unused and in its original packaging.
Return procedure for MAX6306UK25D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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