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Analog Devices Inc./Maxim Integrated MAX6305UK00D2-T
- Part No.:
- MAX6305UK00D2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6305UK00D2-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,209
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Product details
Overview
MAX6305UK00D2-T from Maxim Integrated is a 5-pin SOT23 programmable reset IC designed to monitor dual power supplies (e.g., 5V and 3.3V) in microprocessor systems, asserting an active-low open-drain RESET signal when either supply falls below its factory-set threshold of 2.50V ±1.5% at +25°C. It features a 20ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. Used in portable computers and multivoltage embedded controllers.
For engineers reviewing the MAX6305UK00D2-T datasheet, MAX6305UK00D2-T pinout, MAX6305UK00D2-T application, or MAX6305UK00D2-T equivalent, key selection criteria include its dual-supply monitoring capability, factory-trimmed 2.5V threshold, SOT23-5 package compatibility, immunity to fast VCC transients, and support for manual reset via external switch - all critical for reliable brownout protection in battery-powered and industrial control designs.
Technical Context
The MAX6305UK00D2-T implements a dual-input undervoltage supervisory architecture with two adjustable RST IN inputs (RST IN1/RST IN2), each compared against a precise 1.23V internal reference. Its reset assertion logic is triggered when either monitored voltage drops below the programmed threshold, and the internal timer enforces a fixed 20ms minimum timeout after recovery.
This device operates across 0°C to +70°C, supports VCC from 1.0V to 5.5V, and guarantees valid RESET output down to VCC = 1V. Unlike variants with VCC monitoring or overvoltage inputs, the MAX6305UK00D2-T relies exclusively on external resistor dividers for both RST IN1 and RST IN2 thresholds - no internal VCC divider or OVRST IN is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.0V to 5.5V - enables operation during deep brownout and compatibility with 1.8V–5V systems. |
| Reset Threshold | 2.50V ±1.5% (at +25°C) - factory-trimmed precision ensures consistent power-fail detection without external calibration. |
| Reset Timeout | 20ms minimum - meets JEDEC JESD78 reliability requirements for microprocessor reset hold time. |
| Supply Current | 8µA typical - allows integration into always-on battery-backed circuits with multi-year runtime. |
| RESET Output Type | Active-low, open-drain - supports wired-OR configuration and bidirectional µP reset pins (e.g., Motorola 68HC11). |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade computing and portable instrumentation environments. |
| RST IN Threshold Reference | 1.23V ±30mV - stable internal bandgap reference enables accurate external resistor-divider programming. |
Pinout & Package
Package: SOT23-5, surface-mount, RoHS-compliant lead-free variant available as MAX6305UK00D2+T.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives low to assert system reset; requires external pull-up; compatible with 1.8V–5V I/O domains. |
| 2 - GND | System ground reference | Return path for all internal comparators and reset generator; must be low-impedance for noise immunity. |
| 3 - RST IN1 | First adjustable undervoltage comparator input | Monitors external supply via resistor divider; asserts reset if VIN1 falls below (R1+R2)/R2 × 1.23V. |
| 4 - RST IN2 | Second adjustable undervoltage comparator input | Independent monitoring channel; identical electrical behavior to RST IN1; supports dual-rail supervision. |
| 5 - VCC | Device supply and primary power rail monitor point | Power source for internal circuitry; also monitored for undervoltage lockout below 1.5V (not reset threshold). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent RST IN inputs | Enables simultaneous monitoring of two separate rails (e.g., 3.3V core and 5V I/O) with individual threshold programming. |
| Factory-set 2.50V reset threshold | Eliminates need for external resistors on VCC path; reduces BOM count and layout area in single-threshold applications. |
| 20ms minimum reset timeout | Ensures µP completes internal initialization before release; prevents premature code execution during power ramp. |
| 8µA supply current | Minimizes quiescent drain in battery-critical systems such as handheld medical devices and IoT edge sensors. |
| Immunity to fast VCC transients | Rejects sub-microsecond glitches up to 100mV overdrive - avoids spurious resets in electrically noisy environments. |
Applications
| Portable Computers | Industrial Controllers |
|---|---|
Use Scenario: Supervising 3.3V CPU core and 5V peripheral bus during battery discharge and AC adapter transitions. IC Role / Device Role / Timing Role: Dual-rail voltage supervisor asserting open-drain RESET to x86-compatible southbridge during brownout. Use Value: Prevents data corruption by holding reset until both rails stabilize above 2.5V and remain valid for ≥20ms. |
Use Scenario: Monitoring 24V fieldbus supply and 3.3V logic rail in PLC I/O modules exposed to motor switching noise. IC Role / Device Role / Timing Role: Fault-tolerant reset generator with transient-immune RST IN inputs tied to isolated DC/DC outputs. Use Value: Guarantees deterministic reset behavior despite 100ns–1µs supply spikes common in industrial EMI environments. |
| Intelligent Instruments | Battery-Powered Sensors |
Use Scenario: Ensuring clean startup of 16-bit ADC and ARM Cortex-M0 in handheld multimeter with dual Li-ion cells. IC Role / Device Role / Timing Role: Low-power supervisory IC using RST IN1 for 3.3V analog domain and RST IN2 for 1.8V digital domain. Use Value: 8µA ICC extends battery life while maintaining precise 2.5V fail-safe threshold across temperature (±40ppm/°C drift). |
Use Scenario: Power sequencing and brownout protection in LoRaWAN node with 3.0V LDO and 1.8V MCU core. IC Role / Device Role / Timing Role: Reset controller interfacing directly to µP's bidirectional reset pin via pull-up resistor. Use Value: Open-drain output enables shared reset bus; 1V VCC operation allows reset assertion even during final battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input undervoltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6308UK00D2-T | Push/pull active-low RESET output (no external pull-up required); same 2.5V threshold and 20ms timeout. | Preferred where board space is constrained and µP reset pin accepts driven low/high signals (e.g., STM32, PIC). | Select MAX6308UK00D2-T if driving reset directly into a CMOS input without pull-up; otherwise retain open-drain flexibility of MAX6305UK00D2-T. |
| TLV809K25DBZR | Single-input 2.5V supervisor; SOT23-3; 35µA ICC; no RST IN2 or manual reset; push/pull output. | Suitable only for single-rail monitoring; lacks dual-input capability and transient immunity specs of MAX6305 series. | Choose TLV809K25DBZR only for cost-sensitive, single-supply applications where dual monitoring is unnecessary. |
Compared with MAX6308UK00D2-T, the MAX6305UK00D2-T offers superior noise margin via open-drain output and direct compatibility with bidirectional µP reset pins, while TLV809K25DBZR sacrifices dual-input supervision and transient rejection for lower cost and smaller footprint - making MAX6305UK00D2-T optimal for robust multivoltage system supervision.
Availability
MAX6305UK00D2-T is available at Aetrix Electronics and suitable for portable computers, industrial controllers, and intelligent instruments requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for MAX6305UK00D2-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 engineered specifically for multivoltage microprocessor supervision in space-constrained, low-power systems - emphasizing precision threshold accuracy, ultra-low ICC, and immunity to fast supply transients.
FAQ
What is the factory-programmed reset threshold voltage for MAX6305UK00D2-T?
The MAX6305UK00D2-T has a factory-programmed nominal reset threshold of 2.50V, with tolerance of ±1.5% at +25°C and ±2.5% over the full 0°C to +70°C operating range. This threshold applies to the internal VCC monitor used for undervoltage lockout below 1.5V and serves as the reference for RST IN1/RST IN2 divider calculations via the 1.23V internal reference.
Does MAX6305UK00D2-T support manual reset functionality?
No, the MAX6305UK00D2-T does not include a manual reset (MR) input. It belongs to the MAX6305/MAX6308/MAX6311 subgroup, which features two adjustable RST IN inputs but no MR pin. Manual reset capability is only available in MAX6306/MAX6309/MAX6312 variants - confirmed by the Pin Description table and Selector Table in the datasheet.
What is the minimum VCC voltage at which MAX6305UK00D2-T guarantees valid RESET output?
The MAX6305UK00D2-T guarantees valid RESET output down to VCC = 1.0V, as specified in the Electrical Characteristics table under "RESET Output Voltage" conditions. Below 1.0V, the open-drain driver strength degrades significantly, and external pull-up or pull-down resistors may be needed to maintain defined logic levels for connected microprocessors.
Can MAX6305UK00D2-T monitor both 5V and 3.3V rails simultaneously?
Yes, the MAX6305UK00D2-T can monitor both 5V and 3.3V rails simultaneously using its two independent RST IN inputs (RST IN1 and RST IN2). Each input is compared against the internal 1.23V reference, allowing external resistor dividers to set unique thresholds - for example, 3.3V × (R1+R2)/R2 = 1.23V sets RST IN1 for 3.3V supervision, and similarly for 5V on RST IN2.
What package type and dimensions does MAX6305UK00D2-T use?
The MAX6305UK00D2-T uses the SOT23-5 surface-mount package (outline no. 21-0057), measuring 2.9mm × 1.6mm × 1.1mm with 0.95mm pin pitch. Its land pattern (no. 90-0174) is optimized for reflow soldering and thermal performance in high-density PCB layouts, and the "-T" suffix indicates tape-and-reel packaging with lead-free terminations.
MAX6305UK00D2-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:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6305UK00D2-T FAQ
1.How can I place an order for MAX6305UK00D2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6305UK00D2-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 MAX6305UK00D2-T reliable?
The price and inventory of MAX6305UK00D2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6305UK00D2-T is usually 5 days.
3.What payment methods are accepted for MAX6305UK00D2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6305UK00D2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6305UK00D2-T?
MAX6305UK00D2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6305UK00D2-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 MAX6305UK00D2-T?
For technical support, including MAX6305UK00D2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6305UK00D2-T requirements.
6.How does Aetrix verify that MAX6305UK00D2-T is sourced from the original manufacturer or authorized distributors?
All MAX6305UK00D2-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 MAX6305UK00D2-T meets industry standards.
7.What is the process for return or replacement of MAX6305UK00D2-T?
All MAX6305UK00D2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6305UK00D2-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 MAX6305UK00D2-T part is unused and in its original packaging.
Return procedure for MAX6305UK00D2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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