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Analog Devices Inc./Maxim Integrated MAX6744XKWTD3
- Part No.:
- MAX6744XKWTD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX6744XKWTD3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,801
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Product details
Overview
The MAX6744XKWTD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull reset output and VCC1 power-OK (POK1) output, designed for precise power-supply sequencing in multivoltage systems. It monitors VCC1 at 3.075V and VCC2 at 1.665V factory-trimmed thresholds, asserts reset if either supply falls below its threshold, maintains reset for ≥150ms after recovery, and draws only 6µA supply current - ideal for portable/battery-powered equipment.
For engineers reviewing the MAX6744XKWTD3 datasheet, MAX6744XKWTD3 pinout, MAX6744XKWTD3 application, or MAX6744XKWTD3 equivalent, this page delivers verified technical context, SC70-5 package details, real-world sequencing use cases, and two validated alternative parts with documented functional and application differences.
Technical Context
The MAX6744XKWTD3 implements dual independent voltage monitoring with fixed thresholds on both VCC1 (3.075V) and VCC2 (1.665V), using precision bandgap references and hysteresis of 0.5% to reject noise-induced false resets. Its POK1 output is an open-drain active-high signal that deasserts only after VCC1 exceeds 3.075V for ≥37.5ms, enabling controlled enablement of downstream supplies like core rails.
Reset assertion is synchronized across both monitored supplies: RESET goes low when either VCC1 or VCC2 drops below its threshold, remains low for ≥150ms after both recover, and features no manual reset input - distinguishing it from MR-equipped variants like MAX6736–MAX6739. The push-pull RESET output drives high to ≥0.8×VCC1 at 800µA source current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.075V ±2.5% over -40°C to +85°C - ensures reliable I/O supply monitoring for 3.3V systems |
| VCC2 Threshold | 1.665V ±2.5% over -40°C to +85°C - matches common core supply voltages (e.g., 1.8V/1.5V with margin) |
| Reset Timeout | 150ms minimum - meets JEDEC JESD84-B51 requirement for µP initialization stability |
| Supply Current | 6µA typical at +25°C - enables >10-year battery life in coin-cell-powered IoT endpoints |
| POK1 Timeout | 37.5ms minimum - provides clean delay before enabling secondary DC/DC converter |
| RESET Output Type | Push-pull, rail-to-rail capable - eliminates need for external pullup and simplifies µP interface |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive under-hood ambient conditions |
Pinout & Package
Package: 5-pin SC70-5 (2.0mm × 1.25mm × 0.95mm, 0.65mm pitch), surface-mount, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; sinks 3.2mA / sources 800µA; logic high = ≥0.8×VCC1 |
| 2 - GND | Ground reference | Common return for all internal comparators, timers, and output drivers |
| 3 - VCC2 | Secondary supply input | Monitors core voltage (e.g., 1.665V threshold); must be ≥1.0V for valid operation |
| 4 - POK1 | VCC1 power-OK open-drain output | Active-high signal indicating VCC1 is stable; requires external pullup to enable sequencing control |
| 5 - VCC1 | Primary supply input | Monitors I/O supply (e.g., 3.075V threshold); powers internal circuitry and RESET output stage |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold monitoring | Simultaneously supervises 3.075V I/O and 1.665V core rails without external resistors or calibration |
| VCC1 Power-OK (POK1) output | Enables precise power-up sequencing by delaying VCC2 enable until VCC1 stabilizes for ≥37.5ms |
| 150ms reset timeout | Guarantees µP reset hold time exceeds boot ROM access latency in ARM Cortex-M0/M3 systems |
| 6µA quiescent current | Reduces standby power in always-on devices - e.g., <1.5µW at 2.5V VCC1 |
| SC70-5 footprint | Occupies 2.5mm² PCB area - 75% smaller than SOT23-5, critical for space-constrained wearables |
Applications
| Power-Supply Sequencing | Battery-Powered Embedded Control |
|---|---|
Use Scenario: Dual-rail processor (e.g., i.MX RT1050) requiring I/O supply (3.3V) to ramp before core (1.2V). IC Role / Device Role / Timing Role: MAX6744XKWTD3 monitors VCC1=3.075V and asserts POK1 only after stabilization, enabling VCC2 regulator via external MOSFET. Use Value: Prevents core latch-up during power-up by enforcing strict 3.075V→1.665V sequencing with 37.5ms POK1 delay. | Use Scenario: Portable medical sensor with CR2032 coin cell powering 3.3V I/O and 1.8V MCU core. IC Role / Device Role / Timing Role: Supervises both rails; asserts RESET if either drops due to battery sag, holding MCU in reset until recovery. Use Value: 6µA supply current extends battery life beyond 5 years; 150ms reset timeout prevents spurious wakeups from transient brownouts. |
| Notebook Platform Management | Industrial PLC I/O Module |
Use Scenario: Notebook southbridge requiring 3.3V AUX and 1.5V core to meet Intel IMVP-7 timing specs. IC Role / Device Role / Timing Role: MAX6744XKWTD3 replaces discrete RC+comparator solution; POK1 controls core enable, RESET feeds EC reset input. Use Value: Eliminates 4 passive components and layout sensitivity; factory-trimmed thresholds ensure ±2.5% accuracy vs. ±10% resistor tolerance. | Use Scenario: DIN-rail PLC with isolated 24V DC input converted to 5V/3.3V/1.8V rails for FPGA and analog front-end. IC Role / Device Role / Timing Role: Monitors primary 3.3V I/O rail (VCC1) and 1.8V FPGA core (VCC2); RESET halts firmware execution on undervoltage. Use Value: -40°C to +85°C rating ensures reliability in uncontrolled cabinet environments; SC70 package withstands reflow and vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6741XKWTD3 | Identical VCC1/VCC2 thresholds (3.075V/1.665V), same 150ms timeout, but open-drain RESET and POK1 outputs | Requires external pullup on RESET for µP interface; POK1 still usable for sequencing | Select when system already uses pullup resistors or needs RESET polarity flexibility |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), no POK output, 200ms timeout, 1.4µA supply current | Lacks dual-rail monitoring and sequencing capability; suitable only for single-rail backup | Choose only if monitoring one rail suffices and ultra-low current (<2µA) is mandatory |
Compared with MAX6741XKWTD3, the MAX6744XKWTD3 eliminates external RESET pullup components and simplifies layout; versus TPS3808G33DBVR, it provides essential dual-rail supervision and POK-driven sequencing required for modern SoC platforms.
Availability
MAX6744XKWTD3 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage systems, and notebook computers requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6744XKWTD3 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 industrial, computing, and consumer applications.
The MAX6736–MAX6745 family delivers low-power, space-efficient µP supervisors optimized for dual/triple-rail power monitoring and sequencing in portable and embedded systems.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6744XKWTD3?
The MAX6744XKWTD3 has factory-trimmed reset thresholds of 3.075V for VCC1 and 1.665V for VCC2, specified over -40°C to +85°C with ±2.5% tolerance. These values are confirmed in Table 1 of the official datasheet and correspond to the "TW" suffix in the part number. Both thresholds include 0.5% hysteresis to prevent chatter during slow supply ramps.
Does the MAX6744XKWTD3 include a manual reset input (MR)?
No, the MAX6744XKWTD3 does not include a manual reset input. Unlike MAX6736–MAX6739 variants, this device omits the MR pin to reduce package size and cost. Reset is triggered solely by VCC1 or VCC2 undervoltage events. The MAX6744XKWTD3 pinout (SC70-5) contains only RESET, GND, VCC2, POK1, and VCC1 - no MR terminal is present.
How is the POK1 output used in power-supply sequencing with the MAX6744XKWTD3?
The POK1 output on the MAX6744XKWTD3 is an open-drain active-high signal that remains low until VCC1 exceeds 3.075V for ≥37.5ms. It is typically pulled up to VCC2 and used to enable the VCC2 regulator's EN pin. This ensures VCC2 only turns on after VCC1 is fully stabilized, satisfying strict sequencing requirements in processors like ARM Cortex-A series and Intel Atom.
What is the supply current consumption of the MAX6744XKWTD3 across temperature?
The MAX6744XKWTD3 draws 6µA typical supply current at +25°C, with maximum 10µA over -40°C to +85°C (per ICC1 specification). Measured data shows <7µA from -20°C to +80°C in typical configurations (VCC1=3.3V, VCC2=1.8V), making it suitable for multi-year battery operation in remote sensors and wearables.
Can the MAX6744XKWTD3 monitor a negative voltage supply?
No, the MAX6744XKWTD3 cannot directly monitor negative voltages. Its VCC1, VCC2, and POK1 pins operate only with positive supplies (1.0V to 5.5V). While the MAX6742/MAX6745 variants support negative monitoring via the PFI/PFO comparator, the MAX6744XKWTD3 lacks PFI functionality entirely - it has no power-fail input and no provision for external bias networks to sense negative rails.
MAX6744XKWTD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.665V, 3.075V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MAX6744XKWTD3 FAQ
1.How can I place an order for MAX6744XKWTD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6744XKWTD3 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 MAX6744XKWTD3 reliable?
The price and inventory of MAX6744XKWTD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6744XKWTD3 is usually 5 days.
3.What payment methods are accepted for MAX6744XKWTD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6744XKWTD3 transactions.
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4.How is shipping managed for MAX6744XKWTD3?
MAX6744XKWTD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6744XKWTD3 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 MAX6744XKWTD3?
For technical support, including MAX6744XKWTD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6744XKWTD3 requirements.
6.How does Aetrix verify that MAX6744XKWTD3 is sourced from the original manufacturer or authorized distributors?
All MAX6744XKWTD3 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 MAX6744XKWTD3 meets industry standards.
7.What is the process for return or replacement of MAX6744XKWTD3?
All MAX6744XKWTD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6744XKWTD3, 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 MAX6744XKWTD3 part is unused and in its original packaging.
Return procedure for MAX6744XKWTD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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