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Analog Devices Inc./Maxim Integrated MAX6743XKLTD3+T
- Part No.:
- MAX6743XKLTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6743XKLTD3+T.pdf
- Description:
- IC SUPERVISOR MPU LP SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX6743XKLTD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 4.625V, VTH2 = 3.075V) and one user-adjustable RSTIN input (488mV threshold), push-pull active-low RESET output, no manual reset pin, and no power-fail or POK functionality. It operates from 1.2V to 5.5V supply, draws only 6µA quiescent current, and delivers 150ms minimum reset timeout - ideal for space-constrained, battery-powered multivoltage systems requiring reliable power-on reset sequencing.
For engineers reviewing the MAX6743XKLTD3+T datasheet, MAX6743XKLTD3+T pinout, MAX6743XKLTD3+T application, or MAX6743XKLTD3+T equivalent, key selection considerations include its SC70-5 package footprint, triple-supply monitoring capability with fixed + adjustable thresholds, push-pull RESET drive strength, absence of MR/PFI/POK features, and guaranteed operation across –40°C to +85°C.
Technical Context
The MAX6743XKLTD3+T implements a triple-supply supervisory architecture: VCC1 monitors primary I/O supply (e.g., 5V or 3.3V), VCC2 monitors secondary core supply (e.g., 3.075V), and RSTIN monitors a third voltage via external resistor divider referenced to a precise 488mV internal bandgap. Reset assertion occurs when any monitored voltage falls below its threshold, and RESET remains low for ≥150ms after all voltages recover.
Its push-pull RESET output is referenced to VCC1 and drives high to ≥0.8×VCC1 (800µA source) and low to ≤0.4V (1.2mA sink), eliminating need for external pullup. The device lacks MR, PFI, PFO, and POK1 pins - distinguishing it from other MAX674x variants - and relies solely on supply voltage monitoring and RSTIN for fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold (VTH1) | 4.625V ±75mV over –40°C to +85°C - sets reset point for primary I/O rail (e.g., 5V system) |
| VCC2 Threshold (VTH2) | 3.075V ±50mV over –40°C to +85°C - sets reset point for secondary core rail (e.g., 3.3V or 3.0V domain) |
| RSTIN Threshold | 488mV ±12mV - enables monitoring of third supply (e.g., 1.2V, 1.8V) via external resistor divider |
| Reset Timeout Period | 150ms minimum - ensures µP remains held in reset long enough for stable power-up of all rails |
| Supply Current (ICC1) | 6µA typical at +25°C - enables multi-year battery life in portable equipment |
| Operating Temperature | –40°C to +85°C - qualified for industrial and extended commercial environments |
| Package | 5-pin SC70 - 2.0mm × 1.25mm footprint, compatible with high-density PCB layouts |
Pinout & Package
MAX6743XKLTD3+T uses a 5-pin SC70-5 package with exposed pad (no thermal pad connection required). Pin 1 is RESET (push-pull active-low), Pin 2 is GND, Pin 3 is VCC2, Pin 4 is RSTIN, and Pin 5 is VCC1. No MR, PFI, PFO, or POK1 terminals are present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Push-pull active-low reset output | Drives µP reset pin directly without external pullup; sinks 1.2mA / sources 800µA |
| 2 - GND | Analog/digital ground reference | Common return path for all internal comparators and output stage |
| 3 - VCC2 | Secondary supply voltage input | Monitored against 3.075V threshold; supports 0.9V–3.3V range |
| 4 - RSTIN | Adjustable reset threshold input | Internal 488mV comparator reference; connects to external resistor divider for third-rail monitoring |
| 5 - VCC1 | Primary supply voltage input | Monitored against 4.625V threshold; supports 1.8V–5.0V range |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC1 (4.625V), VCC2 (3.075V), and RSTIN (488mV) - eliminates need for three discrete supervisors |
| Factory-trimmed precision thresholds | VTH1 = 4.625V and VTH2 = 3.075V specified over full temperature range - reduces BOM count and calibration effort |
| Adjustable third-input monitoring | RSTIN accepts external resistor-divider to monitor any supply ≥0.5V - extends flexibility beyond fixed thresholds |
| Ultra-low 6µA supply current | Enables use in always-on, energy-harvesting, or coin-cell-powered applications without compromising reset reliability |
| Push-pull RESET output | Eliminates external pullup resistor and associated board area - simplifies layout and improves noise immunity |
Applications
| Industrial PLC I/O Modules | Medical Wearable Sensors |
|---|---|
Use Scenario: Monitoring dual-rail power (5V I/O + 3.3V MCU core) while also verifying analog front-end bias voltage (1.2V). IC Role / Device Role / Timing Role: Triple-supply supervisor asserting RESET until all three rails stabilize post-power-up. Use Value: Prevents firmware execution before analog sensor bias settles, avoiding corrupted ADC readings during boot. | Use Scenario: Battery-powered ECG patch requiring guaranteed reset if main Li-ion drops below 3.0V or regulated 1.8V LDO fails. IC Role / Device Role / Timing Role: Supervises VCC1 (3.075V), VCC2 (1.8V), and RSTIN (1.2V reference) with 150ms timeout. Use Value: 6µA quiescent current extends single-charge runtime by >20% versus discrete solutions. |
| Automotive Infotainment Head Units | Edge AI Accelerator Cards |
Use Scenario: Ensuring safe boot sequence across 5V USB-C PD input, 3.3V SoC I/O, and 1.2V GPU core rails. IC Role / Device Role / Timing Role: Monitors VCC1 (4.625V), VCC2 (3.075V), and RSTIN (1.2V) to guarantee synchronized reset release. Use Value: Push-pull RESET drives SoC reset pin directly - avoids contention with bidirectional reset I/O ports. | Use Scenario: Validating power integrity across FPGA core (0.85V), I/O bank (1.8V), and auxiliary 3.3V management rail. IC Role / Device Role / Timing Role: Uses RSTIN to monitor 0.85V via resistor divider (VEXT_TH = 0.488V × (R1+R2)/R2). Use Value: Factory-trimmed VTH1/VTH2 eliminate calibration steps; SC70-5 footprint fits tight FPGA power delivery zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6740XKLTD3+T | Open-drain RESET output with internal 50kΩ pullup to VCC1; includes manual reset detect function on RESET pin | Supports momentary pushbutton reset without dedicated MR pin; requires external pullup for bidirectional µP interfaces | Select when manual reset capability is needed and open-drain interface is acceptable |
| TPS3808G33DBVR | Dual-supply supervisor (3.3V + adjustable); no RSTIN input; 350ms timeout; 1.8µA ICC | Lacks third-rail monitoring; optimized for ultra-low-power dual-rail systems only | Select when only two supplies require supervision and sub-2µA current is critical |
Compared with MAX6740XKLTD3+T and TPS3808G33DBVR, the MAX6743XKLTD3+T uniquely provides push-pull RESET drive, factory-set dual thresholds (4.625V/3.075V), and RSTIN-based third-rail monitoring - making it optimal for compact, triple-rail systems where external pullups are undesirable and precise timing is required.
Availability
MAX6743XKLTD3+T is available at Aetrix Electronics and suitable for industrial control panels, portable medical diagnostics, automotive infotainment modules, and edge AI accelerators requiring stable component supply, guaranteed -40°C to +85°C operation, and SC70-5 footprint compatibility.
Supply support for MAX6743XKLTD3+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6736–MAX6745 family delivers low-power, multi-rail µP supervisors in ultra-small SC70 packages - engineered specifically for portable, battery-operated, and space-constrained embedded systems needing reliable power-on reset and supply monitoring.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6743XKLTD3+T?
The MAX6743XKLTD3+T has a factory-trimmed VCC1 reset threshold of 4.625V, with tolerance of ±75mV over the full –40°C to +85°C operating temperature range. This value is encoded in the "LT" suffix per Table 1 of the datasheet and applies specifically to the MAX6743XKLTD3+T variant.
Does the MAX6743XKLTD3+T include a manual reset (MR) input pin?
No, the MAX6743XKLTD3+T does not include a manual reset (MR) input. Its pinout consists only of RESET, GND, VCC2, RSTIN, and VCC1. Manual reset functionality is absent - unlike MAX6740/MAX6741 variants - and cannot be added externally without redesigning the supervisory logic.
What is the purpose of the RSTIN pin on the MAX6743XKLTD3+T?
The RSTIN pin on the MAX6743XKLTD3+T provides an adjustable reset input with a precise 488mV internal reference. By connecting an external resistor divider between VCC1 and GND, designers can monitor a third supply voltage (e.g., 1.2V, 1.8V) and trigger RESET if that voltage falls below the derived threshold - extending supervision beyond the two fixed thresholds.
Can the MAX6743XKLTD3+T be used in a system requiring power-fail detection?
No, the MAX6743XKLTD3+T does not support power-fail detection. It lacks both PFI (power-fail input) and PFO (power-fail output) pins. For power-fail functionality, consider the MAX6742/MAX6745 variants, which integrate a dedicated 488mV comparator with PFI/PFO terminals - a feature omitted from the MAX6743XKLTD3+T design.
What is the reset timeout period for the MAX6743XKLTD3+T, and is it configurable?
The MAX6743XKLTD3+T has a fixed 150ms minimum reset timeout period, indicated by the "D3" suffix in its part number. This value is not user-configurable - unlike the D7 option (1200ms) offered in other MAX674x variants. The timeout begins after all monitored supplies exceed their thresholds and is guaranteed over –40°C to +85°C.
MAX6743XKLTD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6743XKLTD3+T FAQ
1.How can I place an order for MAX6743XKLTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6743XKLTD3+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 MAX6743XKLTD3+T reliable?
The price and inventory of MAX6743XKLTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6743XKLTD3+T is usually 5 days.
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Once your MAX6743XKLTD3+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 MAX6743XKLTD3+T?
For technical support, including MAX6743XKLTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6743XKLTD3+T requirements.
6.How does Aetrix verify that MAX6743XKLTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6743XKLTD3+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 MAX6743XKLTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6743XKLTD3+T?
All MAX6743XKLTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6743XKLTD3+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 MAX6743XKLTD3+T part is unused and in its original packaging.
Return procedure for MAX6743XKLTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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