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Analog Devices Inc./Maxim Integrated MAX6744XKLTD3
- Part No.:
- MAX6744XKLTD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6744XKLTD3.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,225
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Product details
Overview
MAX6744XKLTD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull reset output, VCC1 power-OK (POK1) output, and factory-trimmed thresholds of 4.625V (VTH1) and 3.075V (VTH2). It monitors primary I/O (VCC1) and secondary core (VCC2) supplies, asserts reset if either falls below threshold, and maintains reset for ≥150ms after recovery. Designed for power-supply sequencing in portable multivoltage systems.
For engineers reviewing the MAX6744XKLTD3 datasheet, MAX6744XKLTD3 pinout, MAX6744XKLTD3 application, or MAX6744XKLTD3 equivalent, key selection criteria include its dual fixed-threshold supervision, POK1 timing (37.5–75ms), 6µA supply current, SC70-5 package, and -40°C to +85°C operation - all critical for battery-powered sequenced power rails.
Technical Context
The MAX6744XKLTD3 implements independent dual-supply monitoring with precision voltage comparators referencing internal bandgap references. Its POK1 output activates only after VCC1 exceeds 4.625V for ≥37.5ms, enabling controlled enablement of downstream VCC2 regulators without requiring external timing components.
Reset assertion is synchronized across VCC1 and VCC2 inputs with hysteresis (0.5%) and glitch immunity; the push-pull RESET output drives high to VCC1 (≥0.8×VCC1 at 800µA) and low to ≤0.4V (at 3.2mA), eliminating need for external pullup resistors in most µP interface configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTH1 / VTH2 | 4.625V / 3.075V - factory-trimmed thresholds for I/O and core supply monitoring, specified over full temperature range |
| Reset timeout (tRP) | 150ms min - ensures stable processor initialization after power recovery before release |
| POK1 timeout (tPOKP) | 37.5ms min - guarantees VCC1 stability before enabling VCC2 regulator via open-drain POK1 |
| Supply current (ICC1) | 6µA typical - enables multi-year battery life in always-on portable equipment |
| Operating temp | -40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
| Package | 5-pin SC70 - 2.0mm × 1.25mm footprint ideal for space-constrained PCBs |
| RESET output type | Push-pull - eliminates external pullup resistor, simplifies µP reset interface and reduces BOM count |
Pinout & Package
MAX6744XKLTD3 is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for high-density portable designs. Pin functions are validated per Maxim's official pin configuration diagram for MAX6744.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; no external pullup needed; logic-high = VCC1 (≥0.8×), logic-low ≤0.4V at 3.2mA |
| 2 - GND | Ground reference | Common return for all internal comparators, timers, and output drivers; must be low-impedance connection |
| 3 - VCC2 | Secondary supply input | Monitors core voltage (0.9V–3.3V range); reset asserted if VCC2 < 3.075V |
| 4 - POK1 | VCC1 power-OK open-drain output | Active-high signal (pulled up externally) indicating VCC1 > 4.625V for ≥37.5ms - used to sequence VCC2 enable |
| 5 - VCC1 | Primary supply input | Monitors I/O voltage (1.8V–5.0V range); reset asserted if VCC1 < 4.625V; powers internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold supervision | Simultaneously monitors VCC1 (4.625V) and VCC2 (3.075V) with guaranteed accuracy over -40°C to +85°C - eliminates need for external resistor dividers or trimming |
| VCC1 Power-OK (POK1) output | Provides clean, timed enable signal for downstream VCC2 regulators - removes requirement for discrete RC timing networks or additional supervisors |
| 150ms reset timeout | Ensures µP completes internal state initialization before release - prevents premature execution during marginal power-up conditions |
| 6µA quiescent current | Reduces standby power in battery-backed systems - extends operational lifetime without compromising supervision reliability |
| SC70-5 package | Minimizes PCB area vs. SOT23-5 (≈40% smaller footprint) while maintaining compatible reflow profile and test accessibility |
Applications
| Power-Supply Sequencing | Battery-Powered Multivoltage Systems |
|---|---|
Use Scenario: Dual-rail processor (e.g., ARM Cortex-A series) requiring I/O supply (VCC1) to stabilize before enabling core supply (VCC2). IC Role / Device Role / Timing Role: MAX6744XKLTD3 monitors VCC1 and asserts POK1 only after ≥37.5ms of valid VCC1 (>4.625V), enabling VCC2 regulator via POK1-controlled EN pin. Use Value: Prevents core logic corruption during asymmetric power-up; eliminates need for discrete timing circuits or firmware-based sequencing delays. | Use Scenario: Handheld medical monitor with separate 3.3V I/O and 1.2V core rails powered by single Li-ion cell and dual DC/DC converters. IC Role / Device Role / Timing Role: MAX6744XKLTD3 supervises both rails and asserts push-pull RESET if either drops below threshold; 6µA ICC1 minimizes battery drain during sleep mode. Use Value: Guarantees reliable cold-start and brownout recovery while extending battery runtime beyond 3 years in low-duty-cycle operation. |
| Notebook Platform Voltage Monitoring | Industrial Controller Power Integrity |
Use Scenario: Embedded x86 controller board with 5V auxiliary, 3.3V I/O, and 1.8V core supplies derived from multiphase VRMs. IC Role / Device Role / Timing Role: MAX6744XKLTD3 monitors primary 3.3V rail (VCC1 = 4.625V threshold) and secondary 1.8V rail (VCC2 = 3.075V threshold), asserting RESET on any undervoltage event. Use Value: Detects VRM faults or capacitor aging before system lockup; push-pull RESET ensures fast, deterministic deassertion without pullup resistor tolerance drift. | Use Scenario: Programmable logic controller (PLC) module operating in factory environments with noisy 24V DC input feeding isolated DC/DC converters. IC Role / Device Role / Timing Role: MAX6744XKLTD3 provides fail-safe reset initiation when input-derived VCC1 or VCC2 sags due to line transients or load surges. Use Value: 0.5% threshold hysteresis and 35µs propagation delay ensure immunity to sub-100ns noise spikes while responding within microseconds to true brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6741XKLTD3 | Identical pinout and thresholds, but open-drain RESET (requires external pullup) and same POK1 functionality | Suitable where µP reset pin requires open-drain interface or level translation; adds one resistor to BOM | Select MAX6741XKLTD3 only if legacy design uses open-drain reset or needs manual reset detect on RESET (not present in MAX6744XKLTD3) |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only), no POK1 output, 1.6µA ICC, SOT23-6 package | Lacks dual-monitoring and sequencing capability; requires second IC for VCC2 supervision | Choose only for cost-sensitive single-rail applications where VCC2 monitoring is handled separately or unnecessary |
Compared with MAX6741XKLTD3, MAX6744XKLTD3 eliminates the external pullup resistor and simplifies layout; versus TPS3808G33DBVR, it delivers integrated dual-rail supervision and power-sequencing in one SC70-5 device - reducing component count, board area, and qualification effort for multivoltage systems.
Availability
MAX6744XKLTD3 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, notebook computers, and industrial controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6744XKLTD3 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 and mixed-signal ICs for power, sensing, and connectivity applications, with deep expertise in supervisory and power-management solutions.
The MAX6736–MAX6745 family was engineered specifically for low-power, space-constrained multivoltage systems - delivering dual/triple supply monitoring, sequencing outputs, and ultra-low ICC in miniature SC70 packages for portable and embedded platforms.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6744XKLTD3?
The MAX6744XKLTD3 has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, as defined by the "LT" suffix in its part number and confirmed in Table 1 of the official datasheet. These values are guaranteed over the full -40°C to +85°C operating temperature range with ±2.5% tolerance.
Does the MAX6744XKLTD3 require an external pullup resistor on the RESET pin?
No, the MAX6744XKLTD3 features a push-pull RESET output, so it does not require an external pullup resistor. The output actively drives high to VCC1 (≥0.8×VCC1 at 800µA) and low to ≤0.4V (at 3.2mA), enabling direct connection to most microprocessor reset inputs without additional components.
How is the POK1 output used in power-supply sequencing with the MAX6744XKLTD3?
The POK1 output on the MAX6744XKLTD3 is an open-drain active-high signal that remains low until VCC1 exceeds 4.625V for ≥37.5ms. Once asserted, POK1 can enable a downstream VCC2 regulator (e.g., via EN pin), ensuring strict I/O-before-core power sequencing without external timing elements.
What is the supply current consumption of the MAX6744XKLTD3 under typical operating conditions?
The MAX6744XKLTD3 draws only 6µA of supply current (ICC1) when VCC1 = 3.3V and no reset is asserted, as specified in the Electrical Characteristics table. This ultra-low quiescent current is maintained across the full operating temperature range and enables multi-year battery life in always-on portable devices.
Is the MAX6744XKLTD3 pin-compatible with other devices in the MAX6736–MAX6745 family?
Yes, the MAX6744XKLTD3 shares the identical 5-pin SC70-5 package and pinout with MAX6741, MAX6742, and MAX6745 variants. However, functionally it differs - MAX6744XKLTD3 provides push-pull RESET and POK1, whereas MAX6741 offers open-drain RESET with POK1, and MAX6742 provides power-fail comparator inputs instead.
MAX6744XKLTD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6744XKLTD3 FAQ
1.How can I place an order for MAX6744XKLTD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6744XKLTD3 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 MAX6744XKLTD3 reliable?
The price and inventory of MAX6744XKLTD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6744XKLTD3 is usually 5 days.
3.What payment methods are accepted for MAX6744XKLTD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6744XKLTD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6744XKLTD3?
MAX6744XKLTD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6744XKLTD3 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 MAX6744XKLTD3?
For technical support, including MAX6744XKLTD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6744XKLTD3 requirements.
6.How does Aetrix verify that MAX6744XKLTD3 is sourced from the original manufacturer or authorized distributors?
All MAX6744XKLTD3 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 MAX6744XKLTD3 meets industry standards.
7.What is the process for return or replacement of MAX6744XKLTD3?
All MAX6744XKLTD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6744XKLTD3, 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 MAX6744XKLTD3 part is unused and in its original packaging.
Return procedure for MAX6744XKLTD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6744XKLTD3 Tags
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MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
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APX803L20-29SA-7
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V6340RSP3B+
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MCP130T-315I/TT
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MCP120T-475I/TT
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