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Analog Devices Inc./Maxim Integrated MAX6308UK00D3
- Part No.:
- MAX6308UK00D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6308UK00D3.pdf
- Description:
- IC SUPERVISOR PROGRAMMABLE RESET
- Quantity:
- Payment:
- Shipping:
Inventory:184
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Product details
Overview
MAX6308UK00D3 from Maxim Integrated is a 5-pin SOT23 programmable reset IC designed to monitor dual voltage rails (e.g., 5V and 3.3V) in multivoltage systems, asserting an active-low push/pull RESET signal when either supply falls below its factory-set threshold. It features a 2.5V nominal VCC reset threshold (UK00), 140ms minimum reset timeout (D3), 8µA supply current, and guaranteed RESET validity down to VCC = 1V. It is used in portable computers and embedded control systems requiring robust brownout protection.
For engineers reviewing the MAX6308UK00D3 datasheet, MAX6308UK00D3 pinout, MAX6308UK00D3 application, or MAX6308UK00D3 equivalent, key selection considerations include its dual-input undervoltage monitoring capability, factory-trimmed 2.5V threshold with ±1.5% tolerance at +25°C, push/pull output drive strength (0.3V VOL at 1.2mA sink), immunity to fast VCC transients, and operation across 0°C to +70°C.
Technical Context
The MAX6308UK00D3 belongs to the MAX6305–MAX6313 family of CMOS supervisory circuits with two adjustable undervoltage reset inputs (RST IN1 and RST IN2), enabling independent monitoring of two external power rails. Unlike VCC-monitoring variants (e.g., MAX6306), it does not use an internal voltage divider for VCC threshold detection - instead, both reset triggers are fully configurable via external resistor dividers referenced to its internal 1.23V precision bandgap.
Its push/pull RESET output actively drives low (VOL ≤ 0.3V at 1.2mA) and high (VOH ≥ 0.8 × VCC at 500µA source), eliminating the need for an external pull-up. The device guarantees reset assertion during power-up until VCC exceeds 2.5V and all monitored inputs rise above their thresholds, followed by a precise 140ms (min) timeout before deassertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | +2.5V to +5.5V - supports direct connection to 3.3V or 5V system rails without level shifting. |
| Reset Threshold | Factory-programmed 2.5V nominal on VCC (UK00), ±1.5% tolerance at +25°C - sets primary undervoltage trip point for main supply. |
| Reset Timeout | 140ms minimum (D3 suffix) - ensures µP reset pulse meets typical boot-loader hold-time requirements. |
| Supply Current | 8µA typical at +25°C - enables battery-backed operation in portable equipment with multi-year shelf life. |
| RESET Output Type | Active-low push/pull - provides strong logic-level drive without external components, compatible with bidirectional µP reset pins. |
| Input Reference Voltage | 1.23V ±0.03V (RST IN1/RST IN2) - enables precise external threshold setting via resistor dividers for secondary rails. |
| Operating Temperature | 0°C to +70°C - suitable for commercial-grade computing and industrial control environments. |
Pinout & Package
MAX6308UK00D3 is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads optimized for automated PCB assembly and space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Drives low (≤0.3V @ 1.2mA) or high (≥0.8×VCC @ 500µA); directly interfaces µP reset input without pull-up. |
| 2 - GND | System ground reference | Common return path for all internal comparators and output stage; must be low-impedance for noise immunity. |
| 3 - RST IN1 | Adjustable undervoltage reset input #1 | Compares external rail to internal 1.23V reference; threshold set by resistor divider (e.g., 3.3V rail → R1/R2 = 1.7MΩ/1MΩ). |
| 4 - RST IN2 | Adjustable undervoltage reset input #2 | Independent second comparator input; allows simultaneous monitoring of two auxiliary supplies (e.g., 1.8V core + 3.3V I/O). |
| 5 - VCC | Main supply input and reference | Power source and primary monitor rail; factory-trimmed 2.5V threshold applies here; valid operation starts at VCC > 2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent undervoltage inputs | RST IN1 and RST IN2 each compare external voltages to 1.23V reference, enabling flexible multi-rail supervision without shared thresholds. |
| Factory-trimmed 2.5V VCC threshold | UK00 coding specifies 2.5V nominal trip point with ±1.5% room-temp accuracy - eliminates calibration overhead in production. |
| 140ms minimum reset timeout | D3 suffix guarantees ≥140ms assertion after all rails stabilize - satisfies JEDEC JESD84-B4.8 tRSTH requirement for NAND flash boot. |
| Push/pull RESET output | Actively drives both logic states; sinks 1.2mA and sources 500µA - ensures reliable reset signaling into capacitive or resistive loads. |
| Transient-immune architecture | Rejects VCC glitches <100ns (at 5V overdrive) and RST IN transients <1µs - prevents spurious resets in noisy automotive or industrial settings. |
Applications
| Portable Computers | Embedded Control Systems |
|---|---|
Use Scenario: Monitoring 5V main and 3.3V peripheral rails during battery charging cycles and thermal throttling events. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting RESET if either rail dips below 2.5V (VCC) or configured thresholds (RST IN1/RST IN2). Use Value: Prevents CPU lockup during transient brownouts by guaranteeing 140ms reset pulse while maintaining <8µA quiescent draw. |
Use Scenario: Ensuring safe startup of PLC I/O modules powered by isolated 24V and 5V DC-DC converters. IC Role / Device Role / Timing Role: Independent validation of both converter outputs before enabling fieldbus communication and actuator drivers. Use Value: Eliminates need for discrete comparators and RC timers; 1.23V reference enables accurate 24V rail monitoring via 20:1 divider. |
| Intelligent Instruments | Multivoltage Systems: 3V/5V |
Use Scenario: Power sequencing verification in handheld test equipment with Li-ion battery, 3.3V analog front-end, and 1.8V FPGA core. IC Role / Device Role / Timing Role: Simultaneous supervision of battery voltage (RST IN1), 3.3V rail (RST IN2), and 5V USB interface (VCC). Use Value: Single-chip solution replaces three discrete supervisors; 5-pin SOT23 footprint saves >3mm² PCB area vs. SOIC alternatives. |
Use Scenario: Coordinating reset timing between legacy 5V microcontrollers and modern 3.3V peripherals in industrial gateways. IC Role / Device Role / Timing Role: Generating synchronized RESET pulse only after both 5V and 3.3V rails stabilize above their respective thresholds. Use Value: Push/pull output drives both µP and peripheral reset lines directly; no level-shifter or additional buffering required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input reset IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6305UK00D3 | Open-drain RESET output (no sourcing capability); identical pinout and threshold but requires external pull-up resistor. | Suitable where µP reset pin is open-drain or where wired-OR reset bus is needed. | Select MAX6305UK00D3 only if system design mandates open-drain topology or shares reset line with other supervisors. |
| TLV803EB25DBZR | Single-input supervisor (VDD only); fixed 2.5V threshold; 140ms timeout; SOT23-3 package; no RST IN1/RST IN2 capability. | Limited to single-rail monitoring; lacks dual-input flexibility of MAX6308UK00D3. | Choose TLV803EB25DBZR only for cost-sensitive, space-constrained applications needing basic 2.5V reset without auxiliary rail monitoring. |
Compared with MAX6305UK00D3 and TLV803EB25DBZR, the MAX6308UK00D3 uniquely delivers dual adjustable inputs in the same 5-pin SOT23 footprint with push/pull drive - enabling compact, multi-rail supervision without layout changes or external components.
Availability
MAX6308UK00D3 is available at Aetrix Electronics and suitable for portable computers, embedded control systems, intelligent instruments, and multivoltage systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6308UK00D3 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 product line was engineered specifically for multivoltage microprocessor supervision, addressing the need for precise, low-power, dual-input reset generation in space- and power-constrained systems.
FAQ
What is the factory-set reset threshold for MAX6308UK00D3?
The MAX6308UK00D3 has a factory-programmed nominal reset threshold of 2.5V on its VCC pin, denoted by the "UK00" suffix. This threshold is trimmed to ±1.5% tolerance at +25°C and exhibits ±2.5% variation over the full 0°C to +70°C operating range. The device does not monitor VCC via internal divider for this threshold - instead, RST IN1 and RST IN2 rely on the internal 1.23V reference for external rail supervision.
Does MAX6308UK00D3 support manual reset functionality?
No, the MAX6308UK00D3 does not include a manual-reset (MR) input. Pin 3 and Pin 4 are dedicated to RST IN1 and RST IN2, respectively, and there is no MR pin assigned in its SOT23-5 pinout. Manual reset capability is present only in MAX6306/MAX6309/MAX6312 variants, which replace one of the RST IN pins with MR.
What is the meaning of the 'D3' suffix in MAX6308UK00D3?
The 'D3' suffix in MAX6308UK00D3 specifies a factory-programmed minimum reset timeout period of 140ms. This value is guaranteed across temperature and supply voltage variations and defines the duration RESET remains asserted after all monitored supplies exceed their thresholds. Other options include D1 (1ms), D2 (20ms), and D4 (1120ms).
Can MAX6308UK00D3 monitor overvoltage conditions?
No, the MAX6308UK00D3 does not support overvoltage monitoring. It contains two undervoltage reset inputs (RST IN1 and RST IN2) and a VCC monitor with fixed 2.5V threshold, but lacks an OVRST IN pin. Overvoltage supervision is available only in MAX6307/MAX6310/MAX6313 variants, which include a dedicated overvoltage comparator input.
What are the absolute maximum ratings for MAX6308UK00D3?
The MAX6308UK00D3 has an absolute maximum VCC rating of -0.3V to +6V, and all other pins tolerate -0.3V to (VCC + 0.3V). Continuous power dissipation in the SOT23 package is 571mW at +70°C, derating by 7.1mW/°C above that temperature. Input/output current per pin is limited to ±20mA, and VCC slew rate must not exceed 100V/µs to prevent false triggering.
MAX6308UK00D3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Push-Pull, Totem Pole
- 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
MAX6308UK00D3 FAQ
1.How can I place an order for MAX6308UK00D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6308UK00D3 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 MAX6308UK00D3 reliable?
The price and inventory of MAX6308UK00D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6308UK00D3 is usually 5 days.
3.What payment methods are accepted for MAX6308UK00D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6308UK00D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6308UK00D3?
MAX6308UK00D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6308UK00D3 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 MAX6308UK00D3?
For technical support, including MAX6308UK00D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6308UK00D3 requirements.
6.How does Aetrix verify that MAX6308UK00D3 is sourced from the original manufacturer or authorized distributors?
All MAX6308UK00D3 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 MAX6308UK00D3 meets industry standards.
7.What is the process for return or replacement of MAX6308UK00D3?
All MAX6308UK00D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6308UK00D3, 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 MAX6308UK00D3 part is unused and in its original packaging.
Return procedure for MAX6308UK00D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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