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Analog Devices Inc./Maxim Integrated MAX6305UK00D3+T
- Part No.:
- MAX6305UK00D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6305UK00D3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,775
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Product details
Overview
The MAX6305UK00D3+T from Maxim Integrated is a 5-pin SOT23 programmable reset IC designed to monitor VCC and two adjustable undervoltage inputs (RST IN1/RST IN2) in multivoltage systems. It asserts an active-low open-drain RESET output when any monitored supply falls below its threshold, features a factory-set 2.5V VCC reset threshold (±1.5% at +25°C), 140ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. It is used in portable computers and embedded control systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6305UK00D3+T datasheet, MAX6305UK00D3+T pinout, MAX6305UK00D3+T application, or MAX6305UK00D3+T equivalent, key selection considerations include its dual adjustable reset inputs, immunity to fast VCC transients (<100ns), factory-trimmed 2.5V threshold, SOT23-5 package compatibility, and support for 0°C to +70°C industrial temperature operation.
Technical Context
The MAX6305UK00D3+T implements a CMOS supervisory architecture with three independent reset comparators: one internal factory-trimmed VCC monitor set to 2.5V, and two external resistor-programmable undervoltage inputs (RST IN1 and RST IN2) referenced to a 1.23V internal bandgap. Its reset generator enforces a fixed 140ms minimum timeout after all monitored supplies return to regulation.
It uses an open-drain N-channel RESET output with guaranteed VOL ≤ 0.3V at ISINK = 50µA and VCC ≥ 1.0V, and incorporates transient immunity circuitry that ignores negative-going VCC glitches up to 100µs duration when overdriven by 100mV below threshold - critical for noisy power rails in portable equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.5V ±1.5% (25°C), factory-trimmed - ensures precise power-fail detection without external components |
| Reset Timeout Period | 140ms minimum - guarantees sufficient µP initialization time after power stabilization |
| Supply Current | 8µA typical at VCC = 5.5V - enables battery longevity in portable/battery-powered systems |
| Operating Temperature | 0°C to +70°C - validated for commercial/industrial embedded applications |
| RESET Output Type | Active-low, open-drain - supports wired-OR configuration and bidirectional µP reset pins |
| Input Leakage Current | ±25nA max on RST IN1/RST IN2 - permits use of high-value resistor dividers for low-power monitoring |
| VCC Validity Range | RESET asserted valid down to VCC = 1.0V - maintains system reliability during deep brownout conditions |
Pinout & Package
Package: 5-pin SOT23 (U5+1), 2.9mm × 1.6mm footprint, lead-free (RoHS-compliant) with +T suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives external pull-up; asserts low during reset; compatible with bidirectional µP reset I/O (e.g., Motorola 68HC11) |
| 2 - GND | System ground reference | Return path for all internal comparators and reset generator; must be low-impedance for noise immunity |
| 3 - RST IN1 | Adjustable undervoltage reset input #1 | Monitors external rail via resistor divider; triggers reset when voltage falls below 1.23V reference |
| 4 - RST IN2 | Adjustable undervoltage reset input #2 | Independent second monitoring channel; enables dual-rail supervision (e.g., 3.3V + 5V) without extra ICs |
| 5 - VCC | Main supply and primary monitored rail | Power source and input to factory-trimmed 2.5V threshold comparator; operates from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs | RST IN1 and RST IN2 accept resistor-divided external rails - eliminates need for separate supervisors in multivoltage systems |
| Factory-trimmed 2.5V VCC threshold | ±1.5% accuracy at +25°C, ±2.5% over 0°C to +70°C - removes calibration overhead and improves BOM consistency |
| 140ms minimum reset timeout | Guaranteed assertion period after power recovery - ensures µP completes boot sequence before release |
| 8µA supply current | Enables >10-year battery life in coin-cell–powered devices - critical for portable instrumentation and remote sensors |
| Transient-immune architecture | Rejects VCC glitches <100µs wide (at 100mV overdrive) - prevents spurious resets in electrically noisy environments |
Applications
| Portable Computers | Embedded Control Systems |
|---|---|
Use Scenario: Power sequencing and brownout detection in clamshell laptops with dual 3.3V/5V rails. IC Role / Device Role / Timing Role: Primary VCC supervisor monitoring main 5V supply while RST IN1 tracks 3.3V core logic rail. Use Value: Prevents corrupted firmware execution during AC adapter disconnect or battery sag by asserting RESET until both rails stabilize for ≥140ms. |
Use Scenario: Reliable startup and fault recovery in industrial PLC I/O modules with isolated 24V field power and 5V logic. IC Role / Device Role / Timing Role: Monitors 5V logic rail (VCC) and 24V field supply (via RST IN2 divider) to detect simultaneous undervoltage events. Use Value: Enables deterministic system reset on dual-rail failure - avoids undefined state in safety-critical control loops. |
| Intelligent Instruments | Multivoltage Systems |
Use Scenario: Battery-backed handheld test equipment requiring low-quiescent-current supervision. IC Role / Device Role / Timing Role: Supervises 3.3V microcontroller rail (VCC) and 1.8V ADC reference rail (RST IN1) using high-R dividers. Use Value: 8µA ICC extends AA/AAA battery life beyond 5 years in sleep mode while maintaining accurate 2.5V threshold detection. |
Use Scenario: Power management in telecom line cards with mixed 12V, 5V, and 3.3V domains. IC Role / Device Role / Timing Role: One MAX6305UK00D3+T per card monitors 5V (VCC) and 12V (RST IN2 via 4:1 divider) for coordinated reset. Use Value: Reduces component count vs. discrete supervisors - single IC replaces two dedicated reset ICs with matched timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6306UK25D3+T | Same SOT23-5 package and 140ms timeout, but factory-set VCC threshold is 2.5V (identical), and includes manual-reset (MR) input - MAX6305 lacks MR | Required where operator-initiated reset is needed (e.g., field-serviceable instruments); not drop-in due to extra MR pin function | Select MAX6306UK25D3+T only if manual reset capability is mandatory; otherwise MAX6305UK00D3+T offers simpler interface with dual RST IN |
| TPS3808G125DBVR | 3-pin SOT23, fixed 1.25V threshold, 200ms timeout, 1.6µA ICC - lower current but no adjustable inputs or dual monitoring | Suitable only for single-rail 1.25V systems; cannot replace dual-input functionality of MAX6305UK00D3+T | Choose TPS3808G125DBVR for ultra-low-power single-supply apps; MAX6305UK00D3+T remains preferred for multivoltage supervision |
Compared with MAX6306UK25D3+T, the MAX6305UK00D3+T trades manual reset for dual adjustable inputs - enabling true multirail monitoring without external logic. Against TPS3808G125DBVR, it provides higher threshold flexibility and dual-rail capability at the cost of 6.4µA higher quiescent current.
Availability
The MAX6305UK00D3+T is available at Aetrix Electronics and suitable for portable computers, embedded control systems, intelligent instruments, and multivoltage systems requiring stable component supply across commercial temperature ranges.
Supply support for MAX6305UK00D3+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, with emphasis on high-reliability industrial and computing solutions.
The MAX6305–MAX6313 family was engineered specifically for multivoltage microprocessor supervision in space-constrained, battery-sensitive systems - delivering factory-trimmed accuracy, ultra-low ICC, and robust transient immunity in SOT23-5.
FAQ
What is the factory-set reset threshold voltage for the MAX6305UK00D3+T?
The MAX6305UK00D3+T has a factory-set VCC reset threshold of 2.5V, with ±1.5% tolerance at +25°C and ±2.5% over the full 0°C to +70°C operating range. This value is laser-trimmed during production and does not require external calibration. The "UK00" in the part number explicitly denotes the 2.5V nominal threshold per Maxim's ordering convention.
Does the MAX6305UK00D3+T support manual reset functionality?
No, the MAX6305UK00D3+T does not include a manual-reset (MR) input. It belongs to the MAX6305/MAX6308/MAX6311 subgroup, which features two adjustable undervoltage inputs (RST IN1/RST IN2) but omits the MR pin. For manual reset capability, consider the pin-compatible MAX6306UK25D3+T - same 2.5V threshold and 140ms timeout, but adds MR functionality at Pin 3.
What are the absolute maximum ratings for VCC on the MAX6305UK00D3+T?
The MAX6305UK00D3+T has an absolute maximum VCC rating of +6V, with recommended operating range from +1.0V to +5.5V. Operation below 1.0V disables internal comparators and invalidates RESET assertion; above 5.5V risks permanent damage. The device guarantees RESET validity down to VCC = 1.0V, making it suitable for deep brownout detection in battery-powered systems.
Can the MAX6305UK00D3+T monitor both 3.3V and 5V rails simultaneously?
Yes, the MAX6305UK00D3+T can monitor both rails: its VCC pin monitors the 5V supply directly (with 2.5V threshold), while RST IN1 and RST IN2 accept resistor-divided inputs - e.g., a 2:1 divider on the 3.3V rail yields 1.65V at RST IN1, triggering reset when 3.3V drops below ~3.1V. This dual-input architecture enables true multivoltage supervision without additional ICs.
What is the guaranteed reset timeout period for the MAX6305UK00D3+T?
The MAX6305UK00D3+T guarantees a minimum reset timeout period of 140ms, corresponding to the "D3" suffix in its part number (D1 = 1ms, D2 = 20ms, D3 = 140ms, D4 = 1120ms). This timeout begins when all monitored supplies (VCC, RST IN1, RST IN2) exceed their respective thresholds and ensures µP firmware initializes fully before release.
MAX6305UK00D3+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:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- Adjustable/Selectable
- 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
MAX6305UK00D3+T FAQ
1.How can I place an order for MAX6305UK00D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6305UK00D3+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 MAX6305UK00D3+T reliable?
The price and inventory of MAX6305UK00D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6305UK00D3+T is usually 5 days.
3.What payment methods are accepted for MAX6305UK00D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6305UK00D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6305UK00D3+T?
MAX6305UK00D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6305UK00D3+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 MAX6305UK00D3+T?
For technical support, including MAX6305UK00D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6305UK00D3+T requirements.
6.How does Aetrix verify that MAX6305UK00D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6305UK00D3+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 MAX6305UK00D3+T meets industry standards.
7.What is the process for return or replacement of MAX6305UK00D3+T?
All MAX6305UK00D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6305UK00D3+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 MAX6305UK00D3+T part is unused and in its original packaging.
Return procedure for MAX6305UK00D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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