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Analog Devices Inc./Maxim Integrated MAX6343SUT+T
- Part No.:
- MAX6343SUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6343SUT+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,756
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Product details
Overview
MAX6343SUT+T from Maxim Integrated is an active-low, open-drain microprocessor supervisory circuit in a 6-pin SOT23 package, designed to monitor VCC supply voltage (1.0V–5.5V) and provide reset assertion when VCC falls below a factory-trimmed 2.93V threshold. It includes a dedicated power-fail comparator (PFI/PFO) with 1.25V internal reference for low-battery or auxiliary supply monitoring, and features a debounced manual-reset input (MR). It is used in portable/battery-powered equipment requiring reliable brownout protection and early power-fail warning.
For engineers reviewing the MAX6343SUT+T datasheet, MAX6343SUT+T pinout, MAX6343SUT+T application, or MAX6343SUT+T equivalent, key selection criteria include its open-drain RESET output compatibility with mixed-voltage systems, guaranteed reset validity down to VCC = +1V, 100ms minimum reset timeout, and precise 2.93V ±1.5% reset threshold over –40°C to +125°C.
Technical Context
The MAX6343SUT+T implements a precision bandgap-based voltage detector for VCC supervision and a separate comparator for PFI monitoring against a stable 1.25V reference. Its open-drain RESET output requires an external pull-up resistor and supports interfacing with logic supplies up to +5.5V independent of VCC.
It integrates MR input debouncing via internal timing (1µs min pulse rejection), guarantees reset assertion during VCC ramp-up and brownout, and maintains functional reset behavior across full industrial temperature range (–40°C to +125°C) with supply current as low as 1.2µA at VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V ±1.5% - factory-trimmed for accurate brownout detection at nominal 2.93V supply level |
| Supply Voltage Range | +1.0V to +5.5V - enables operation directly from low-voltage battery rails or post-regulator supplies |
| Reset Timeout Period | 100ms min - ensures µP remains held in reset long enough for stable power rail establishment |
| PFI Threshold | +1.25V ±100mV - fixed internal reference for reliable power-fail or low-battery warning generation |
| RESET Output Type | Active-low, open-drain - allows wired-OR configuration and level-shifting across multiple supply domains |
| Supply Current | 1.2µA typical at VCC = 1V - ultra-low quiescent current critical for battery longevity in portable systems |
| Operating Temperature | –40°C to +125°C - qualified for harsh environments including automotive under-hood and industrial control |
Pinout & Package
Package: 6-pin SOT23-6, surface-mount, lead-free (RoHS-compliant), 1.6mm × 2.9mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Positive supply input | Primary power rail input (1.0V–5.5V); powers internal circuitry and resets µP when below 2.93V |
| 2 - GND | Ground reference | System ground return path; required for all internal comparators and output stage biasing |
| 3 - PFI | Power-fail input | Monitors external voltage divider; asserts PFO when voltage drops below 1.25V for early-warning shutdown |
| 4 - PFO | Power-fail output | Open-drain output active-low when PFI < 1.25V; used to trigger µP interrupt or backup system action |
| 5 - MR | Manual-reset input | CMOS-compatible active-low input; debounced internally; forces reset on button press or system-initiated recovery |
| 6 - RESET | Reset output | Active-low open-drain output; requires external pull-up; asserts for ≥100ms after VCC rise or MR release |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.93V with ±1.5% tolerance over temperature - eliminates external resistor calibration and improves system-level voltage margin accuracy |
| Guaranteed reset validity to VCC = +1V | Ensures clean, logic-valid reset signal even during deep brownout or ultra-low-power wake-up sequences |
| Dedicated power-fail comparator | Independent 1.25V reference and PFI/PFO pair - enables dual-supply monitoring without sharing reset timing or thresholds |
| Debounced MR input | 1µs minimum glitch rejection - removes mechanical switch bounce without external RC filtering or firmware overhead |
| SOT23-6 footprint | Miniature 1.6mm × 2.9mm package - saves PCB area in space-constrained portable and IoT edge devices |
Applications
| Portable/Battery-Powered Equipment | Telecom Equipment |
|---|---|
Use Scenario: Battery-powered handheld test instrument operating from single-cell Li-ion (2.7V–4.2V) with real-time clock and flash memory. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and monitors battery voltage decay via PFI divider to trigger graceful shutdown before data corruption. Use Value: Prevents firmware crash and NAND write corruption by asserting RESET before VCC drops below µP operational minimum, while PFO initiates save-to-EEPROM sequence. |
Use Scenario: Line card in carrier-grade Ethernet switch with dual 3.3V/1.2V supplies and hot-swap capability. IC Role / Device Role / Timing Role: Monitors 3.3V auxiliary rail and uses PFO to flag 1.2V core supply degradation before thermal throttling occurs. Use Value: Enables predictive maintenance alert via PFO-driven I²C interrupt, avoiding ungraceful link-down events during voltage sag. |
| Multivoltage Systems | Embedded Control Systems |
Use Scenario: Industrial PLC module with isolated 5V, 3.3V, and 2.5V domains powering FPGA, MCU, and analog front-end. IC Role / Device Role / Timing Role: Uses open-drain RESET pulled to 5V to coordinate reset across all domains; PFI monitors 2.5V rail via resistor divider. Use Value: Ensures synchronized, glitch-free power-on reset across heterogeneous voltage domains without level translators. |
Use Scenario: Automotive body controller with CAN interface, operating from 12V battery (via 5V LDO) and requiring fail-safe boot sequencing. IC Role / Device Role / Timing Role: Provides VCC supervision and MR-triggered recovery after CAN bus fault-induced reboot; PFO tied to watchdog timer enable. Use Value: Guarantees deterministic boot state after transient faults, meeting ISO 16750-2 pulse immunity requirements for reset integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6342SUT+T | Active-low push-pull RESET output; includes MR input; no PFO output | Lacks power-fail warning capability; suitable only where reset coordination without auxiliary monitoring is sufficient | Select when system requires simpler reset signaling without interrupt-driven shutdown logic |
| TLV809KDBZR | 2.63V fixed reset threshold; push-pull active-low RESET; no PFI/PFO or MR input; SOT23-3 package | Smaller footprint but no manual reset or power-fail monitoring; limited to single-rail supervision | Choose for cost-sensitive, space-constrained designs needing only basic VCC reset without advanced features |
Compared with MAX6343SUT+T, MAX6342SUT+T provides push-pull drive but omits PFO functionality, while TLV809KDBZR reduces size and cost but sacrifices MR and power-fail warning-making MAX6343SUT+T optimal for systems requiring coordinated reset + predictive power management.
Availability
MAX6343SUT+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, telecom equipment, multivoltage systems, and embedded control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6343SUT+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX6342–MAX6345 family was designed specifically for robust, low-power microprocessor supervision in battery-critical and thermally demanding applications, integrating precision reset, power-fail warning, and manual reset in minimal footprint.
FAQ
What is the exact reset threshold voltage of the MAX6343SUT+T?
The MAX6343SUT+T has a factory-trimmed VCC reset threshold of 2.93V with a tolerance of ±1.5% over the full operating temperature range (–40°C to +125°C). This value is laser-trimmed during production and specified in the Electrical Characteristics table of the official Maxim datasheet. The 'S' suffix in MAX6343SUT+T explicitly denotes the 2.93V variant.
Does the MAX6343SUT+T support operation down to 1.0V supply voltage?
Yes, the MAX6343SUT+T is fully specified to operate with VCC as low as +1.0V. Its internal circuitry-including the reset generator and PFI comparator-remains functional and guarantees valid logic-level RESET assertion down to this voltage. This feature ensures reliable brownout detection in ultra-low-power or energy-harvesting systems where supply rails dip near 1V.
How does the open-drain RESET output of the MAX6343SUT+T interface with different logic families?
The MAX6343SUT+T's open-drain RESET output requires an external pull-up resistor to a logic supply (up to +5.5V), enabling direct interfacing with 1.8V, 3.3V, or 5V µPs without level shifters. The pull-up value (typically 4.7kΩ–10kΩ) is selected to ensure VOL ≤ 0.4V at ISINK = 100µA while minimizing standby current. This architecture supports wired-OR reset buses in multi-processor systems.
Can the PFI input of the MAX6343SUT+T monitor negative voltages?
Yes, the MAX6343SUT+T's PFI input can monitor negative supplies using an external resistor network and NPN transistor as shown in Maxim's Figure 8. The circuit converts negative rail degradation into a rising PFI voltage above 1.25V, causing PFO to go high and assert RESET via MR tieback. Accuracy depends on resistor tolerance and PFI threshold stability, but the method is validated in the datasheet for –5V to –12V rails.
What is the minimum pulse width required on the MR input of the MAX6343SUT+T to trigger a reset?
The MAX6343SUT+T requires a minimum MR low pulse width of 1µs to guarantee reset assertion, due to internal debouncing circuitry. Pulses shorter than this may be rejected as noise. The MR input is CMOS-compatible (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC) and features 100kΩ internal pull-up when left floating, allowing direct connection to a momentary switch without external components.
MAX6343SUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- 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
MAX6343SUT+T FAQ
1.How can I place an order for MAX6343SUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6343SUT+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 MAX6343SUT+T reliable?
The price and inventory of MAX6343SUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6343SUT+T is usually 5 days.
3.What payment methods are accepted for MAX6343SUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6343SUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6343SUT+T?
MAX6343SUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6343SUT+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 MAX6343SUT+T?
For technical support, including MAX6343SUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6343SUT+T requirements.
6.How does Aetrix verify that MAX6343SUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6343SUT+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 MAX6343SUT+T meets industry standards.
7.What is the process for return or replacement of MAX6343SUT+T?
All MAX6343SUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6343SUT+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 MAX6343SUT+T part is unused and in its original packaging.
Return procedure for MAX6343SUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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