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Analog Devices Inc./Maxim Integrated MAX6345ZUT
- Part No.:
- MAX6345ZUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6345ZUT.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:858
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Product details
Overview
MAX6345ZUT from Maxim Integrated is a precision 6-pin SOT23 microprocessor supervisory circuit with dual reset outputs (active-high push-pull RESET and active-low push-pull RESET), factory-trimmed 2.33V VCC reset threshold, +1.25V power-fail comparator input (PFI), and guaranteed reset assertion down to VCC = +1V. It monitors supply integrity in battery-powered embedded systems requiring reliable power-up sequencing and early power-fail warning.
For engineers reviewing the MAX6345ZUT datasheet, MAX6345ZUT pinout, MAX6345ZUT application, or MAX6345ZUT equivalent, key selection criteria include its dual active push-pull reset outputs, 2.33V reset threshold tolerance (±25mV over -40°C to +125°C), 100ms minimum reset timeout, PFI/PFO monitoring capability, and SOT23-6 package compatibility with space-constrained portable designs.
Technical Context
The MAX6345ZUT integrates two independent reset generators: one asserting RESET high upon VCC rise above 2.33V or MR deassertion, and another asserting RESET low under identical conditions - both with 100–280ms timeout. Its internal +1.25V reference enables precise PFI-based voltage monitoring for power-fail or low-battery detection independent of the main reset function.
It operates across full industrial temperature range (-40°C to +125°C) with supply voltage from +1.0V to +5.5V, guarantees valid logic-level reset outputs down to VCC = +1V, and features debounced CMOS-compatible MR input with 1µs minimum pulse width and 0.1µs glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.33V ±25mV (–40°C to +125°C); ensures reliable reset assertion during brownout at ultra-low supply voltages |
| Reset Timeout Period | 100ms min / 280ms max; provides sufficient hold time for µP initialization before release |
| Supply Voltage Range | +1.0V to +5.5V; supports operation down to near-dead-battery conditions while maintaining valid reset output |
| PFI Threshold | +1.25V ±100mV; enables accurate power-fail or secondary supply monitoring via external resistor divider |
| Output Drive | RESET: VOH ≥ 0.8×VCC @ 50µA sink; RESET: VOL ≤ 0.4V @ 1.2mA sink; ensures robust interfacing with diverse µP reset inputs |
| MR Input Logic | VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC; compatible with standard CMOS logic and pushbutton interfaces without level-shifting |
| Quiescent Current | 25µA typ @ VCC = 3V; minimizes standby power in battery-critical applications |
Pinout & Package
MAX6345ZUT is housed in a miniature 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts in portable and space-constrained systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Main supply input | Accepts +1.0V to +5.5V; powers internal comparators, reference, and output drivers |
| 2 - GND | Ground reference | Common return path for all internal circuitry and external PFI/PFO connections |
| 3 - PFI | Power-fail monitor input | Compares external voltage (via divider) against +1.25V reference; asserts PFO low when below threshold |
| 4 - PFO | Power-fail output | Active-low open-drain signal indicating PFI < 1.25V; used for µP interrupt or system shutdown prep |
| 5 - RESET | Active-high push-pull reset | Drives high for ≥100ms after VCC > 2.33V or MR release; directly drives µP reset pins requiring active-high assertion |
| 6 - RESET | Active-low push-pull reset | Drives low for ≥100ms after VCC > 2.33V or MR release; compatible with standard µP active-low reset inputs |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-high and active-low push-pull signals eliminate need for external inverters or level translators |
| Factory-trimmed 2.33V threshold | Eliminates external resistor networks and calibration; reduces BOM count and improves long-term stability |
| +1.25V precision PFI reference | Enables accurate monitoring of secondary supplies (e.g., +3.3V, +2.5V) or battery voltage with <1% error |
| Guaranteed operation down to VCC = +1V | Ensures deterministic reset behavior during deep brownout or end-of-life battery discharge |
| Debounced manual-reset input | Hardware filtering removes switch bounce; eliminates need for firmware debounce or external RC network |
Applications
| Portable/Battery-Powered Equipment | Telecom Equipment |
|---|---|
Use Scenario: Handheld medical devices operating from single-cell Li-ion batteries with tight voltage margins. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and monitors battery voltage via PFI to trigger graceful shutdown before cutoff. Use Value: Dual reset outputs interface natively with mixed-signal SoCs having both active-high and active-low reset domains; 2.33V threshold aligns precisely with Li-ion discharge knee. | Use Scenario: Remote radio units powered by PoE-derived +5V with backup supercapacitor holdup. IC Role / Device Role / Timing Role: Detects primary supply sag using VCC monitoring and triggers PFO interrupt to initiate capacitor discharge management. Use Value: PFI comparator operates independently of reset state, enabling real-time power-fail response without affecting µP reset timing integrity. |
| Multivoltage Systems | Embedded Control Systems |
Use Scenario: Industrial PLC modules with separate +5V, +3.3V, and +1.8V rails. IC Role / Device Role / Timing Role: Uses resistor divider on PFI to monitor +1.8V rail while VCC tied to +3.3V; asserts RESET/RESET only when +3.3V is stable and +1.8V is within spec. Use Value: Eliminates need for multiple supervisors; single IC ensures coordinated reset release across voltage domains with no timing skew. | Use Scenario: Automotive body control module with cold-cranking immunity requirements. IC Role / Device Role / Timing Role: Guarantees valid reset assertion even during VCC dips to +1.0V during cranking transients. Use Value: 100ms reset timeout and +1V operational floor prevent spurious resets during engine start, improving system robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6342ZUT-T | Single active-low push-pull reset output; includes MR input but no second reset output | Lacks dual-reset capability; requires external inverter if active-high reset needed | Select when only one reset polarity is required and board space is extremely constrained |
| TPS3808G12DBVR | Single active-low open-drain reset; 1.2V threshold; no PFI/PFO functionality | No power-fail monitoring; different reset architecture (no MR input on base variant) | Select for cost-sensitive, single-rail applications where PFI functionality is unnecessary |
Compared with MAX6342ZUT-T and TPS3808G12DBVR, the MAX6345ZUT uniquely delivers dual push-pull reset outputs and integrated PFI/PFO monitoring in the same SOT23-6 footprint - enabling compact, feature-rich supervision without external components or layout compromises.
Availability
MAX6345ZUT is available at Aetrix Electronics and suitable for portable computers, telecom equipment, and multivoltage systems requiring stable component supply, extended temperature support (–40°C to +125°C), and precision reset threshold accuracy.
Supply support for MAX6345ZUT 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, automotive, and communications markets.
The MAX6342–MAX6345 family was designed specifically for microprocessor supervision in battery-powered and multivoltage digital systems, emphasizing precision threshold accuracy, ultra-low supply operation, and integrated power-fail warning capability.
FAQ
What is the exact reset threshold voltage of the MAX6345ZUT and how tightly is it specified?
The MAX6345ZUT has a factory-trimmed nominal VCC reset threshold of 2.33V, with a maximum deviation of ±25mV over the full operating temperature range of –40°C to +125°C. This specification is guaranteed in production test and documented in the Electrical Characteristics table of the official datasheet. The 'Z' suffix explicitly denotes this 2.33V variant, and the MAX6345ZUT maintains this threshold stability without external calibration.
Does the MAX6345ZUT provide both active-high and active-low reset outputs simultaneously?
Yes, the MAX6345ZUT provides two independent, simultaneous reset outputs: pin 5 (RESET) is an active-high push-pull output, and pin 6 (RESET) is an active-low push-pull output. Both assert for a minimum of 100ms after VCC rises above 2.33V or after the MR input transitions from low to high. This dual-output architecture eliminates the need for external inverters or level shifters in systems requiring both reset polarities, and is a defining functional difference between MAX6345ZUT and other members of the MAX6342–MAX6345 family.
Can the MAX6345ZUT monitor a secondary voltage such as +1.8V or battery voltage?
Yes, the MAX6345ZUT can monitor secondary voltages using its PFI (pin 3) and PFO (pin 4) terminals. By connecting a resistor divider from the target voltage to PFI, the device compares that divided voltage against its internal +1.25V reference. For example, to monitor +1.8V, a divider ratio yielding 1.25V at PFI when the input is 1.8V will cause PFO to go low when the monitored voltage drops below ~1.8V. This function operates independently of the main reset generator, allowing concurrent power-fail warning and reset control in the MAX6345ZUT.
What is the minimum supply voltage at which the MAX6345ZUT guarantees valid reset output levels?
The MAX6345ZUT guarantees valid logic-level reset outputs down to VCC = +1.0V. Specifically, RESET (pin 5) maintains VOH ≥ 0.8×VCC when sourcing 50µA, and RESET (pin 6) maintains VOL ≤ 0.4V when sinking 1.2mA - both specifications holding true at VCC = +1.0V. This capability ensures deterministic reset behavior during deep brownout or end-of-battery conditions, a critical feature confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections of the MAX6345ZUT datasheet.
Is the MR (manual reset) input on the MAX6345ZUT debounced, and what are its electrical characteristics?
Yes, the MR input (pin 5 on MAX6342/MAX6343/MAX6344, not present on MAX6345ZUT) is debounced internally - however, the MAX6345ZUT does not include an MR input. Per the Pin Description and Selector Guide, MAX6345 replaces the MR pin with the second reset output (RESET). Therefore, the MAX6345ZUT has no MR terminal; its reset initiation relies solely on VCC monitoring and PFI-triggered PFO-to-MR feedback (if externally wired). This structural difference is fundamental to the MAX6345ZUT's dual-reset architecture and must be accounted for in schematic design.
MAX6345ZUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.33V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6345ZUT FAQ
1.How can I place an order for MAX6345ZUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6345ZUT 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 MAX6345ZUT reliable?
The price and inventory of MAX6345ZUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6345ZUT is usually 5 days.
3.What payment methods are accepted for MAX6345ZUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6345ZUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6345ZUT?
MAX6345ZUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6345ZUT 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 MAX6345ZUT?
For technical support, including MAX6345ZUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6345ZUT requirements.
6.How does Aetrix verify that MAX6345ZUT is sourced from the original manufacturer or authorized distributors?
All MAX6345ZUT 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 MAX6345ZUT meets industry standards.
7.What is the process for return or replacement of MAX6345ZUT?
All MAX6345ZUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6345ZUT, 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 MAX6345ZUT part is unused and in its original packaging.
Return procedure for MAX6345ZUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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