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Analog Devices Inc./Maxim Integrated MAX6306UK31D3-T
- Part No.:
- MAX6306UK31D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6306UK31D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,939
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Product details
Overview
The MAX6306UK31D3-T from Maxim Integrated is a 5-pin SOT23 programmable reset IC designed to monitor VCC and one external undervoltage input (RST IN), asserting an active-low push/pull RESET signal when either falls below its threshold. It features a factory-set 3.08V ±2.5% VCC reset threshold, 140ms (min) reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. It is used in portable computers and multivoltage embedded systems for reliable power-on and brownout reset generation.
For engineers reviewing the MAX6306UK31D3-T datasheet, MAX6306UK31D3-T pinout, MAX6306UK31D3-T application, or MAX6306UK31D3-T equivalent, key selection criteria include its dual-supply monitoring capability (VCC + RST IN), manual reset input (MR), immunity to fast transients, and compatibility with 3.3V/5V system rails requiring stable, low-power supervisory logic.
Technical Context
The MAX6306UK31D3-T implements a precision internal voltage divider to monitor VCC against a factory-trimmed 3.08V threshold, while simultaneously comparing an external voltage at RST IN to a 1.23V internal reference via resistor-divider programming. Its reset generator includes a temperature-stable timeout timer and glitch-immune comparators.
It features a push/pull RESET output capable of sourcing 800µA and sinking 3.2mA, a manual-reset input (MR) with 63.5kΩ internal pull-up and 1.5µs minimum pulse width, and operates across 0°C to +70°C with VCC ranging from (3.08V + 2.5%) to 5.5V - ensuring robustness in battery-powered and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V ±2.5% (factory-trimmed); ensures accurate brownout detection on main supply rail |
| Reset Timeout Period | 140ms (min); guarantees µP remains held in reset long enough for stable power ramp-up |
| Supply Current | 8µA (typ); enables use in always-on, battery-critical applications without significant drain |
| RESET Output Type | Active-low push/pull; eliminates need for external pull-up and supports direct drive of CMOS/TTL inputs |
| Operating Temperature | 0°C to +70°C; suitable for commercial-grade computing and instrumentation equipment |
| VCC Operating Range | (3.08V + 2.5%) to 5.5V; defines minimum valid supply for functional reset assertion |
| MR Input Logic | TTL/CMOS-compatible with internal 63.5kΩ pull-up; allows momentary switch or logic-level reset initiation |
Pinout & Package
Package: 5-pin SOT23 (U5+1), surface-mount, RoHS-compliant lead-free variant indicated by "+T" suffix; footprint compatible with standard 0.95mm pitch land pattern (Maxim land pattern no. 90-0174).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Drives µP reset pin directly; sinks 3.2mA / sources 800µA; valid down to VCC = 1V |
| 2 - GND | System ground reference | Return path for all internal comparators and output stage; must be low-impedance |
| 3 - RST IN | Adjustable undervoltage reset input | Compares external voltage (via resistor divider) to 1.23V reference; asserts reset if input falls below threshold |
| 4 - MR | Manual reset input | Logic-low active; internally pulled up to VCC; initiates reset for duration of timeout after release |
| 5 - VCC | Main supply input and monitored rail | Power source and primary supervision target; internal divider sets 3.08V reset point |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply monitoring | Simultaneously supervises VCC (3.08V threshold) and external rail via RST IN with independent comparator |
| Transient immunity | Guaranteed immunity to fast negative-going VCC transients ≤100ns at 5.0V overdrive (per TOC7) |
| No external components required | Factory-programmed threshold and timeout eliminate need for timing capacitors or trimming resistors |
| Guaranteed RESET validity | RESET output remains logically valid (VOL ≤0.4V, VOH ≥0.8×VCC) down to VCC = 1V |
| Manual reset integration | MR pin includes internal 63.5kΩ pull-up and 1.5µs glitch rejection - supports switch or logic interface without debounce |
Applications
| Portable Computers | Industrial Controllers |
|---|---|
Use Scenario: Power sequencing during battery-to-AC switchover in notebook PCs. IC Role / Device Role / Timing Role: Monitors both 3.3V core and 5V I/O rails; asserts RESET if either dips during transition. Use Value: Prevents firmware corruption by holding µP in reset until both supplies stabilize post-switchover. |
Use Scenario: Brownout protection in PLC I/O modules powered from unregulated 24V DC. IC Role / Device Role / Timing Role: Supervises 5V logic rail derived from 24V; uses RST IN to monitor auxiliary 3.3V sensor supply. Use Value: Ensures deterministic restart after line sag - critical for safety-critical control loop integrity. |
| Intelligent Instruments | Multivoltage Embedded Systems |
Use Scenario: Power-up initialization in handheld test meters with dual 3.3V/5V analog/digital domains. IC Role / Device Role / Timing Role: Resets microcontroller only after both domains exceed thresholds and timeout expires. Use Value: Eliminates race conditions between analog front-end settling and digital boot sequence. |
Use Scenario: System-level reset coordination in FPGA-based communication gateways with 1.2V, 3.3V, and 5V rails. IC Role / Device Role / Timing Role: Uses RST IN to monitor auxiliary 3.3V rail while VCC monitors primary 5V domain. Use Value: Enables single-chip supervision of heterogeneous voltage domains without additional comparators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6306UK31D2-T | Same 3.08V VCC threshold and pinout, but 20ms (min) reset timeout instead of 140ms | Suitable for faster-boot systems where shorter reset hold time is acceptable | Select when µP startup time < 20ms and longer timeout risks unnecessary delay |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms default timeout, 1.6µA quiescent current, SOT23-5 package | Lacks RST IN input and manual reset; optimized for ultra-low-power single-rail monitoring | Choose for cost-sensitive, single-supply designs where external rail monitoring is not required |
Compared with MAX6306UK31D2-T and TPS3808G33DBVR, the MAX6306UK31D3-T uniquely balances extended reset hold time (140ms), dual-supply supervision (VCC + RST IN), and integrated manual reset - making it optimal for portable and multivoltage systems demanding robust, field-serviceable reset behavior.
Availability
The MAX6306UK31D3-T is available at Aetrix Electronics and suitable for portable computers, industrial controllers, and intelligent instruments requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for MAX6306UK31D3-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 U.S.-based 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 supervisory applications - delivering precision reset thresholds, transient immunity, and flexible input configurations in minimal SOT23 packaging.
FAQ
What is the factory-set reset threshold voltage for the MAX6306UK31D3-T?
The MAX6306UK31D3-T has a factory-set VCC reset threshold of 3.08V with ±2.5% tolerance over temperature (0°C to +70°C). This value is trimmed using an internal resistor divider and corresponds to the "31" in the part number per Table 1 of the datasheet. The threshold applies specifically to the VCC pin; RST IN uses a separate 1.23V internal reference.
Does the MAX6306UK31D3-T support manual reset functionality?
Yes, the MAX6306UK31D3-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) after MR returns high. An internal 63.5kΩ pull-up resistor allows direct connection of a momentary switch to GND without external components.
What is the minimum VCC voltage at which the MAX6306UK31D3-T guarantees valid RESET output?
The MAX6306UK31D3-T guarantees RESET output validity (VOL ≤0.4V, VOH ≥0.8×VCC) down to VCC = 1V. Below 1V, output drive capability degrades significantly. This specification ensures reliable reset assertion during slow power-down sequences common in battery-backed systems.
Can the MAX6306UK31D3-T monitor a second voltage rail besides VCC?
Yes, the MAX6306UK31D3-T monitors a second rail via the RST IN pin (pin 3), which compares an externally divided voltage to a 1.23V internal reference. This enables supervision of auxiliary supplies such as 3.3V, 2.5V, or 1.8V rails - independent of the 3.08V VCC threshold - with no additional ICs required.
What are the key differences between the MAX6306UK31D3-T and MAX6306UK31D2-T?
The MAX6306UK31D3-T and MAX6306UK31D2-T share identical VCC threshold (3.08V), package (SOT23-5), and pinout, but differ in reset timeout: D3 denotes 140ms (min), while D2 specifies 20ms (min). This makes the D3 variant suitable for systems requiring longer reset hold times, such as those with slow-starting regulators or complex boot sequences.
MAX6306UK31D3-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:
- 3.08V, 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
MAX6306UK31D3-T FAQ
1.How can I place an order for MAX6306UK31D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6306UK31D3-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 MAX6306UK31D3-T reliable?
The price and inventory of MAX6306UK31D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6306UK31D3-T is usually 5 days.
3.What payment methods are accepted for MAX6306UK31D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6306UK31D3-T transactions.
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4.How is shipping managed for MAX6306UK31D3-T?
MAX6306UK31D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6306UK31D3-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 MAX6306UK31D3-T?
For technical support, including MAX6306UK31D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6306UK31D3-T requirements.
6.How does Aetrix verify that MAX6306UK31D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6306UK31D3-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 MAX6306UK31D3-T meets industry standards.
7.What is the process for return or replacement of MAX6306UK31D3-T?
All MAX6306UK31D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6306UK31D3-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 MAX6306UK31D3-T part is unused and in its original packaging.
Return procedure for MAX6306UK31D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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