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Analog Devices Inc./Maxim Integrated MAX6345MUT
- Part No.:
- MAX6345MUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6345MUT.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6345MUT from Maxim Integrated is a precision 6-pin SOT23 microprocessor supervisory circuit with dual push-pull reset outputs (active-high RESET and active-low RESET), factory-trimmed 4.38V VCC reset threshold, +1.25V power-fail comparator input (PFI), and guaranteed reset assertion down to VCC = +1V. It monitors supply integrity in multivoltage embedded systems and provides early power-fail warning for orderly shutdown.
For engineers reviewing the MAX6345MUT datasheet, MAX6345MUT pinout, MAX6345MUT application, or MAX6345MUT equivalent, key selection criteria include dual-reset output polarity, 4.38V threshold accuracy over -40°C to +125°C, PFI/PFO monitoring capability, 100ms minimum reset timeout, and SOT23-6 package compatibility with space-constrained portable designs.
Technical Context
The MAX6345MUT integrates two independent reset generators: one asserting active-high RESET on VCC rise above 4.38V (±2.5% over temp), and another asserting active-low RESET under identical conditions. Its dedicated PFI input connects to an internal +1.25V reference, enabling precise external voltage monitoring via resistor dividers.
Unlike MAX6342/MAX6343/MAX6344 variants, MAX6345MUT replaces the manual-reset (MR) input with a second reset output - eliminating user-triggered reset but enabling simultaneous high/low logic-level reset signaling to multiple downstream components without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.38V ±2.5% over -40°C to +125°C - ensures reliable µP reset at defined supply rail margin |
| Reset Timeout Period | 100ms min - guarantees sufficient hold time for full µP initialization after power-up |
| Supply Voltage Range | +1.0V to +5.5V - supports operation during brownout and low-battery conditions |
| PFI Input Threshold | +1.25V ±10mV - enables accurate power-fail or secondary supply monitoring |
| RESET Output Drive | Push-pull, VOH ≥0.8×VCC @ 50µA, VOL ≤0.4V @ 1.2mA - drives standard CMOS loads directly |
| RESET Output Drive | Push-pull, VOH ≥0.8×VCC @ 50µA, VOL ≤0.4V @ 1.2mA - compatible with µP reset inputs requiring active-low assertion |
| Operating Temperature | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6345MUT is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and exposed pad not present. Pin 1 marked by dot; pin numbering follows standard SOT23 counterclockwise from mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Supply Input | Primary power rail input; powers internal comparators and reset generators; operates from +1.0V to +5.5V |
| 2 - GND | Ground Reference | Analog and digital ground return; must be low-impedance connection to system ground plane |
| 3 - PFI | Power-Fail Input | Inverting input of comparator referenced to +1.25V; asserts PFO when voltage falls below threshold |
| 4 - PFO | Power-Fail Output | Open-drain output active-low when PFI < 1.25V; used for interrupt or secondary reset triggering |
| 5 - RESET | Active-High Reset Output | Push-pull output asserted high for ≥100ms after VCC exceeds 4.38V or after recovery from brownout |
| 6 - RESET | Active-Low Reset Output | Push-pull output asserted low for ≥100ms under same VCC recovery condition; no MR pin required |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-high and active-low signals eliminate need for external inverters or level shifters in mixed-logic systems |
| Factory-trimmed 4.38V threshold | ±2.5% tolerance over full temperature range ensures consistent reset point without calibration |
| +1.25V precision PFI reference | Enables accurate monitoring of secondary supplies (e.g., +3.3V, +2.5V) using simple resistor dividers |
| Guaranteed operation to VCC = +1V | Ensures valid reset state during deep brownout - critical for data retention and safe shutdown sequencing |
| 100ms minimum reset pulse width | Meets JEDEC JESD88 and most µP reset timing requirements without external RC timing components |
Applications
| Portable/Battery-Powered Equipment | Telecom Equipment |
|---|---|
Use Scenario: Battery-powered handheld test instrument operating from single-cell Li-ion (2.7–4.2V) with backup SRAM and real-time clock. IC Role / Device Role / Timing Role: Supervises main 3.3V LDO output and triggers controlled shutdown when battery drops below 3.0V via PFI divider; asserts dual RESET to preserve register state and halt CPU before voltage collapse. Use Value: Prevents memory corruption and undefined µP behavior during gradual discharge by providing deterministic reset timing and early power-fail warning. |
Use Scenario: Line card in carrier-grade Ethernet switch with dual 12V/3.3V rails and hot-swap controller. IC Role / Device Role / Timing Role: Monitors 3.3V core supply with 4.38V threshold (via scaled divider); uses PFO to signal power management ASIC before VCC dropout; dual RESET outputs coordinate FPGA and PHY reset sequencing. Use Value: Enables synchronized, glitch-free reset across heterogeneous logic domains while supporting IEEE 802.3af power negotiation timing windows. |
| Multivoltage Systems | Embedded Control Systems |
Use Scenario: Industrial PLC module with isolated 24V, 5V, and 3.3V domains powering MCU, I/O drivers, and analog front-end. IC Role / Device Role / Timing Role: Uses PFI to monitor 5V rail with 1.25V reference; asserts both RESET and RESET to ensure all voltage domains initialize coherently; tolerates 1V brownout on 3.3V rail without false trigger. Use Value: Eliminates race conditions between µP boot and peripheral enable by guaranteeing monotonic reset deassertion across rails. |
Use Scenario: Automotive body control module (BCM) with CAN interface, operating at -40°C to +125°C ambient. IC Role / Device Role / Timing Role: Provides fail-safe reset supervision for 5V MCU supply; dual outputs drive both MCU reset pin and watchdog timer enable; PFO monitors 12V battery via resistive divider for low-voltage warning. Use Value: Meets AEC-Q100 Grade 1 thermal requirements and supports ISO 16750-2 load-dump immunity through robust reset timing and voltage threshold stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6342MUT-T | Single active-low push-pull RESET output; includes MR input instead of second RESET; same 4.38V threshold and PFI/PFO | Requires external inverter or logic to generate active-high reset; supports manual reset via pushbutton | Select when system requires user-initiated reset and only one reset polarity is needed |
| TPS3808G33DBVR | Single open-drain active-low RESET; 3.3V fixed threshold; no PFI/PFO; 200ms reset timeout; SOT23-6 | Lacks dual-output capability and power-fail monitoring; optimized for simpler 3.3V-only applications | Select when cost-sensitive design needs basic reset only and secondary voltage monitoring is handled elsewhere |
Compared with MAX6342MUT-T and TPS3808G33DBVR, MAX6345MUT uniquely delivers concurrent active-high and active-low reset signaling without external components, making it optimal for systems requiring strict reset coordination across mixed-logic families while retaining power-fail warning capability.
Availability
MAX6345MUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, telecom infrastructure, and multivoltage embedded systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant operation.
Supply support for MAX6345MUT 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 demanding industrial, automotive, and communications applications.
The MAX6342–MAX6345 family was engineered specifically for high-reliability microprocessor supervision in space- and power-constrained systems, emphasizing threshold accuracy, wide supply range, and integrated power-fail detection.
FAQ
What is the exact reset threshold voltage of MAX6345MUT and how is it designated?
The MAX6345MUT has a factory-trimmed VCC reset threshold of 4.38V, indicated by the "M" suffix in its part number per Maxim's Selector Guide. This value is guaranteed within ±2.5% over the full -40°C to +125°C operating temperature range and is confirmed in the Electrical Characteristics table of the official datasheet. The threshold is laser-trimmed during production and does not require external calibration.
Does MAX6345MUT support manual reset functionality like other members of the MAX6342–MAX6345 family?
No, MAX6345MUT does not include a manual-reset (MR) input. Unlike MAX6342/MAX6343/MAX6344, the MAX6345 variant replaces the MR pin with a second reset output (active-high RESET). Therefore, MAX6345MUT cannot be triggered externally via pushbutton; reset assertion is solely governed by VCC crossing the 4.38V threshold or PFO-driven events routed externally to other logic.
How is the PFI input used in MAX6345MUT, and what voltage does it compare against?
The PFI input of MAX6345MUT compares the applied voltage against an internal +1.25V precision reference. When the voltage at PFI falls below +1.25V, the PFO output goes low. This allows monitoring of secondary supplies (e.g., 3.3V or 2.5V rails) using a resistor divider - for example, a 250kΩ/100kΩ divider on a 3.3V rail yields ~0.95V at PFI, triggering PFO well before the main VCC drops.
What are the drive capabilities of the two reset outputs on MAX6345MUT?
Both RESET (active-high) and RESET (active-low) outputs on MAX6345MUT are push-pull with guaranteed performance: VOH ≥ 0.8×VCC at 50µA source current, and VOL ≤ 0.4V at 1.2mA sink current. These specifications allow direct interfacing with standard CMOS µP reset inputs without pull-up/pull-down resistors - unlike open-drain alternatives such as MAX6343.
Is MAX6345MUT suitable for automotive applications, and what temperature range does it support?
Yes, MAX6345MUT is rated for -40°C to +125°C operation and is widely deployed in automotive body electronics and infotainment modules. Its guaranteed reset threshold stability, 100ms minimum timeout, and operation down to VCC = +1V meet key requirements for AEC-Q100 Grade 1 qualification. While the device itself is not AEC-Q100 certified, its electrical specs and packaging align with automotive design practices.
MAX6345MUT 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:
- 4.38V
- 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
MAX6345MUT FAQ
1.How can I place an order for MAX6345MUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6345MUT 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 MAX6345MUT reliable?
The price and inventory of MAX6345MUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6345MUT is usually 5 days.
3.What payment methods are accepted for MAX6345MUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6345MUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6345MUT?
MAX6345MUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6345MUT 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 MAX6345MUT?
For technical support, including MAX6345MUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6345MUT requirements.
6.How does Aetrix verify that MAX6345MUT is sourced from the original manufacturer or authorized distributors?
All MAX6345MUT 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 MAX6345MUT meets industry standards.
7.What is the process for return or replacement of MAX6345MUT?
All MAX6345MUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6345MUT, 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 MAX6345MUT part is unused and in its original packaging.
Return procedure for MAX6345MUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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