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Analog Devices Inc./Maxim Integrated MAX6345SUT+
- Part No.:
- MAX6345SUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6345SUT+.pdf
- Description:
- IC RESET MPU W/COMP SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,637
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Product details
Overview
MAX6345SUT+ from Maxim Integrated is a dual-output microprocessor supervisory circuit in SOT23-6 package, providing both active-high push-pull RESET and active-low push-pull RESET outputs with factory-trimmed 2.93V VCC reset threshold, guaranteed reset assertion down to VCC = +1V, and integrated 1.25V power-fail comparator for low-battery or auxiliary supply monitoring - used in portable telecom and multivoltage embedded systems.
For engineers reviewing the MAX6345SUT+ datasheet, MAX6345SUT+ pinout, MAX6345SUT+ application, or MAX6345SUT+ equivalent, key selection criteria include dual-reset polarity support, PFI/PFO voltage monitoring capability, 100ms minimum reset timeout, SOT23-6 footprint compatibility, and operation across –40°C to +125°C industrial temperature range.
Technical Context
The MAX6345SUT+ integrates two independent reset generators: one asserting high upon VCC rise above 2.93V (±1.5% over temp), the other asserting low under same condition, both with 100–280ms timeout. Its dedicated PFI input compares against an internal 1.25V reference to drive PFO, enabling early-warning detection of falling auxiliary supplies or battery voltage.
No manual reset (MR) input is present - unlike MAX6342–MAX6344 - freeing Pin 5 for second reset output. The device operates from 1.0V to 5.5V supply, maintains valid logic levels on both RESET outputs down to VCC = +1V, and features glitch-immune reset timing with 12µs rejection of 100mV VCC transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V ±1.5% (factory-trimmed; ensures reliable µP startup at precise supply level) |
| Reset Timeout Period | 100ms min (guaranteed hold time prevents premature release during brownout recovery) |
| Supply Voltage Range | +1.0V to +5.5V (supports ultra-low-voltage logic and standard 3.3V/5V systems) |
| PFI Threshold | +1.25V (enables accurate power-fail or low-battery warning via external resistor divider) |
| Operating Temperature | –40°C to +125°C (qualified for harsh industrial and automotive under-hood environments) |
| Supply Current | 25µA typ at +3V (ultra-low quiescent current extends battery life in portable equipment) |
| RESET Output Drive | Push-pull, VOH ≥0.8×VCC @ 50µA / VOL ≤0.4V @ 1.2mA (direct interface to CMOS inputs without pull resistors) |
Pinout & Package
Package: 6-pin SOT23-6, surface-mount, lead-free (RoHS-compliant), 2.9mm × 1.6mm × 1.1mm body height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Positive supply input | Primary power rail connection; powers internal comparators, reset generator, and outputs |
| 2 - GND | Ground reference | Common return path for all internal circuitry and output sinks/sources |
| 3 - PFI | Power-fail monitor input | Connects to voltage divider for monitoring secondary supply; trips PFO when <1.25V |
| 4 - PFO | Power-fail comparator output | Active-low open-drain signal indicating auxiliary supply drop; requires external pull-up |
| 5 - RESET | Active-high push-pull reset output | Drives high for ≥100ms after VCC exceeds 2.93V; directly drives µP reset pin |
| 6 - RESET | Active-low push-pull reset output | Drives low for ≥100ms after VCC exceeds 2.93V; compatible with legacy active-low µP inputs |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-high and active-low signals eliminate need for external inverters or level shifters |
| Factory-trimmed 2.93V threshold | Eliminates external resistor networks and calibration; reduces BOM count and layout area |
| Guaranteed reset validity to VCC = +1V | Ensures deterministic reset behavior during deep brownout or ultra-low-power wake-up sequences |
| Integrated 1.25V PFI comparator | Enables autonomous power-fail detection without additional voltage references or op-amps |
| SOT23-6 footprint | Minimizes PCB real estate in space-constrained portable and IoT devices |
Applications
| Portable Telecom Equipment | Battery-Powered Embedded Controllers |
|---|---|
|
Use Scenario: Compact 4G/LTE base station modules requiring stable reset sequencing during battery backup switchover. IC Role / Device Role / Timing Role: Dual-reset supervisor ensuring simultaneous initialization of RF SoC and baseband processor upon main supply restoration. Use Value: Eliminates race conditions between active-high and active-low reset domains using single IC, reducing interconnect complexity and board area. |
Use Scenario: Industrial sensor node powered by Li-ion battery with undervoltage cutoff and graceful shutdown logic. IC Role / Device Role / Timing Role: Monitors main VCC (2.93V trip) and battery voltage (via PFI divider) to trigger coordinated reset and PFO interrupt before critical brownout. Use Value: Enables firmware-controlled shutdown within 100ms window, preserving nonvolatile memory integrity and preventing corrupted state transitions. |
| Multivoltage System Power Sequencing | Networking Edge Device Supervision |
|
Use Scenario: FPGA-based gateway with 1.2V core, 3.3V I/O, and 5V PHY rails requiring synchronized reset release. IC Role / Device Role / Timing Role: Primary VCC supervisor for 3.3V rail; PFI monitors 5V PHY supply to assert PFO and force system-level reset if 5V fails first. Use Value: Prevents partial initialization where FPGA configures while PHY remains unpowered, avoiding bus contention and latch-up risk. |
Use Scenario: Small-form-factor Ethernet switch operating in uncontrolled ambient environments with wide temperature swings. IC Role / Device Role / Timing Role: Ensures reliable µP reset across –40°C to +125°C; dual outputs interface natively to management MCU (active-high) and PHY (active-low). Use Value: Guarantees deterministic boot at temperature extremes without derating or external timing components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6342SUT+ | Single active-low push-pull RESET; includes MR input; no second RESET output | Lacks dual-reset capability; requires external inverter for active-high reset | Select when manual reset control is required and only one reset polarity is needed |
| TLV809E29DBZR | Single active-low open-drain RESET; no PFI/PFO; 2.93V threshold; SOT23-3 package | No power-fail monitoring; smaller footprint but no auxiliary supply supervision | Select for cost-sensitive, single-rail applications where PFI functionality is unnecessary |
Compared with MAX6342SUT+ and TLV809E29DBZR, the MAX6345SUT+ uniquely delivers dual-polarity reset outputs and integrated PFI/PFO monitoring in the same SOT23-6 footprint - enabling compact, robust supervision of multirail systems without external components or layout compromises.
Availability
MAX6345SUT+ is available at Aetrix Electronics and suitable for portable telecom equipment, battery-powered embedded controllers, multivoltage system power sequencing, networking edge devices, and industrial sensor nodes requiring stable component supply across extended temperature ranges.
Supply support for MAX6345SUT+ 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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.
The MAX6342–MAX6345 family was engineered specifically for high-reliability microprocessor supervision in space- and power-constrained systems, emphasizing factory-trimmed accuracy, wide supply range, and integrated power-fail warning capability.
FAQ
What is the reset threshold voltage for MAX6345SUT+?
The MAX6345SUT+ has a factory-trimmed VCC reset threshold of 2.93V, with ±1.5% tolerance over the full –40°C to +125°C temperature range. This value is laser-trimmed during production and specified in the Electrical Characteristics table of the MAX6345SUT+ datasheet. It ensures precise, repeatable reset activation without external calibration components.
Does MAX6345SUT+ include a manual reset (MR) input?
No, the MAX6345SUT+ does not include a manual reset (MR) input. Unlike the MAX6342/MAX6343/MAX6344 variants, the MAX6345SUT+ repurposes Pin 5 as a second reset output (active-high push-pull), resulting in dual-reset functionality but no MR capability. This design choice prioritizes dual-polarity reset generation over user-triggered reset.
How does the PFI/PFO function work in MAX6345SUT+?
In the MAX6345SUT+, the PFI pin connects to an internal 1.25V comparator reference. When the voltage at PFI falls below 1.25V, the PFO output goes low - enabling early-warning detection of failing auxiliary supplies or battery depletion. PFO is open-drain and requires an external pull-up resistor; it operates independently of the reset outputs and supports monitoring of any DC voltage via a resistor divider.
What are the output types for the two RESET pins on MAX6345SUT+?
The MAX6345SUT+ provides two push-pull reset outputs: Pin 5 (RESET) is active-high, driving high for ≥100ms after VCC rises above 2.93V; Pin 6 (RESET) is active-low, driving low for ≥100ms under the same condition. Both outputs are fully buffered, capable of sourcing ≥50µA and sinking ≥1.2mA, eliminating need for external pull resistors in most CMOS interfacing scenarios.
Is MAX6345SUT+ qualified for automotive applications?
The MAX6345SUT+ is rated for operation from –40°C to +125°C and meets industrial reliability standards, but it is not AEC-Q200 qualified or marketed by Maxim/Analog Devices for automotive use. For automotive-grade supervision, designers should consider explicitly qualified alternatives such as the MAX6369 or ADMP441-series supervisors, which undergo full automotive qualification testing.
MAX6345SUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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-6
MAX6345SUT+ FAQ
1.How can I place an order for MAX6345SUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6345SUT+ 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 MAX6345SUT+ reliable?
The price and inventory of MAX6345SUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6345SUT+ is usually 5 days.
3.What payment methods are accepted for MAX6345SUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6345SUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6345SUT+?
MAX6345SUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6345SUT+ 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 MAX6345SUT+?
For technical support, including MAX6345SUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6345SUT+ requirements.
6.How does Aetrix verify that MAX6345SUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6345SUT+ 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 MAX6345SUT+ meets industry standards.
7.What is the process for return or replacement of MAX6345SUT+?
All MAX6345SUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6345SUT+, 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 MAX6345SUT+ part is unused and in its original packaging.
Return procedure for MAX6345SUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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