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Analog Devices Inc./Maxim Integrated MAX6744XKZGD3+
- Part No.:
- MAX6744XKZGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX6744XKZGD3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:546
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Product details
Overview
The MAX6744XKZGD3+ from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull reset output, VCC1 power-OK (POK1) output, and factory-trimmed reset thresholds of 2.313V (VTH1) and 1.575V (VTH2). It monitors primary I/O supply (VCC1) and secondary core supply (VCC2), asserts reset if either falls below its threshold, and maintains reset for ≥150ms after recovery. It is used in multivoltage portable systems requiring precise power sequencing.
For engineers reviewing the MAX6744XKZGD3+ datasheet, MAX6744XKZGD3+ pinout, MAX6744XKZGD3+ application, or MAX6744XKZGD3+ equivalent, key selection criteria include its dual fixed-threshold supervision, POK1 output for VCC1-to-VCC2 sequencing, 6µA supply current, SC70-5 package, and -40°C to +85°C operating range.
Technical Context
The MAX6744XKZGD3+ implements independent voltage monitoring for VCC1 and VCC2 using precision bandgap references, with reset assertion triggered by either supply falling below its factory-set threshold. Its internal timer guarantees a minimum 150ms reset timeout period after all monitored supplies recover above threshold.
It features an open-drain POK1 output that deasserts high only after VCC1 exceeds 2.313V for ≥37.5ms, enabling controlled power-up sequencing. The push-pull RESET output is referenced to VCC1 and requires no external pullup, simplifying interface with microprocessors lacking dedicated reset pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTH1 / VCC1 Threshold | 2.313V ±0.100V - factory-trimmed for reliable I/O supply monitoring at nominal 2.5V systems |
| VTH2 / VCC2 Threshold | 1.575V ±0.075V - factory-trimmed for core supply monitoring in 1.6V/1.8V processor domains |
| Reset Timeout (tRP) | 150ms min - ensures µP remains held in reset long enough for stable power rail settling |
| POK1 Timeout (tPOKP) | 37.5ms min - provides clean enable signal to downstream DC/DC converter after VCC1 stabilization |
| Supply Current (ICC1) | 6µA typical at +25°C - enables battery-powered operation with negligible quiescent drain |
| Operating Temp Range | -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 portable PCB layouts |
Pinout & Package
MAX6744XKZGD3+ is housed in a 5-pin SC70-5 package with exposed pad (no thermal pad connection required). Pin 1 is RESET, Pin 2 is GND, Pin 3 is VCC2, Pin 4 is POK1, Pin 5 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Push-pull active-low reset output | Drives low when VCC1 or VCC2 drops below threshold; actively drives high when deasserted - no external pullup needed |
| 2 - GND | Analog/digital ground reference | Common return path for all internal comparators and output drivers; must be connected to system ground plane |
| 3 - VCC2 | Secondary supply input (core voltage) | Monitored against 1.575V threshold; powers internal circuitry for VCC2 comparator and timing logic |
| 4 - POK1 | Open-drain active-high power-OK output | Stays low until VCC1 >2.313V for ≥37.5ms; used to enable VCC2 regulator in sequenced power-up |
| 5 - VCC1 | Primary supply input (I/O voltage) | Monitored against 2.313V threshold; powers main supervisory circuitry and RESET output driver |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold supervision | Simultaneously monitors 2.313V (VCC1) and 1.575V (VCC2) without external resistors - eliminates BOM cost and layout area for threshold-setting networks |
| VCC1 Power-OK (POK1) output | Provides clean, timed enable signal to control VCC2 regulator startup - prevents race conditions during dual-rail power-up |
| Push-pull RESET output | Eliminates need for external pullup resistor - reduces component count and improves noise immunity on reset line |
| 6µA supply current | Enables multi-year battery life in always-on portable devices - critical for GPS trackers and IoT edge sensors |
| SC70-5 package | 2.0mm × 1.25mm footprint saves >60% board area vs. SOT23-5 - essential for ultra-compact handheld designs |
Applications
| Portable Power Sequencing | Industrial Dual-Rail Controllers |
|---|---|
Use Scenario: Battery-powered handheld instrument with separate 2.5V I/O and 1.6V core rails. IC Role / Device Role / Timing Role: MAX6744XKZGD3+ monitors both rails and asserts RESET until both are stable; POK1 enables core regulator only after I/O rail reaches 2.313V for 37.5ms. Use Value: Prevents core logic from powering up before I/O interfaces are ready - avoids bus contention and initialization failures. | Use Scenario: Programmable logic controller with isolated 3.3V field I/O and 1.8V FPGA core. IC Role / Device Role / Timing Role: MAX6744XKZGD3+ supervises both supplies and holds FPGA in reset until both exceed thresholds; POK1 controls sequencing of auxiliary 1.8V LDO. Use Value: Ensures deterministic power-up order across temperature (-40°C to +85°C), eliminating boot hangs in harsh environments. |
| Medical Sensor Modules | POS Terminal Power Management |
Use Scenario: Wearable ECG sensor with coin-cell battery, 2.2V analog front-end, and 1.5V MCU core. IC Role / Device Role / Timing Role: MAX6744XKZGD3+ uses 2.313V/1.575V thresholds to detect brownout on both rails; 6µA ICC1 extends battery runtime. Use Value: Guarantees safe shutdown before supply collapse - preserves sensor calibration data and prevents corrupted memory writes. | Use Scenario: Retail point-of-sale terminal with 5V USB host, 3.3V display interface, and 1.2V SoC core. IC Role / Device Role / Timing Role: MAX6744XKZGD3+ configured for 2.313V/1.575V thresholds monitors scaled-down rails; POK1 enables core only after I/O rail stabilizes. Use Value: Eliminates need for discrete sequencing ICs - reduces BOM cost and design complexity while meeting EN55032 EMC requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6741XKZGD3+ | Identical dual-fixed thresholds (2.313V/1.575V), same SC70-5 package, but open-drain RESET output requiring external pullup | Lacks push-pull RESET - adds component and routing overhead where µP lacks internal pullup | Select MAX6744XKZGD3+ when push-pull RESET simplifies design; choose MAX6741XKZGD3+ only if legacy layout already includes pullup |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); no POK1 output; SOT23-6 package; 1.6µA ICC | Cannot monitor dual rails simultaneously; no built-in sequencing capability - requires additional ICs for same function | Use only for single-rail applications; not a functional substitute for MAX6744XKZGD3+ in dual-supply systems |
Compared with MAX6741XKZGD3+, the MAX6744XKZGD3+ eliminates external RESET pullup components and reduces layout complexity; compared with TPS3808G33DBVR, it delivers integrated dual-rail monitoring and sequencing in one device - reducing total solution size and bill-of-materials cost.
Availability
MAX6744XKZGD3+ is available at Aetrix Electronics and suitable for portable equipment, multivoltage systems, and notebook computers requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6744XKZGD3+ 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.
The MAX6736–MAX6745 family was developed specifically for low-power dual- and triple-voltage microprocessor supervision in space- and energy-constrained portable and industrial systems.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6744XKZGD3+?
The MAX6744XKZGD3+ has a factory-trimmed VCC1 reset threshold (VTH1) of 2.313V, with tolerance of ±0.100V over the full -40°C to +85°C temperature range. This value is encoded in the "ZG" suffix per Table 1 of the datasheet and applies specifically to the MAX6744XKZGD3+ - not to other variants in the MAX6736–MAX6745 family.
Does the MAX6744XKZGD3+ require an external pullup resistor on the RESET pin?
No, the MAX6744XKZGD3+ features a push-pull RESET output, which actively drives both high and low states. Unlike open-drain variants such as MAX6741XKZGD3+, the MAX6744XKZGD3+ does not require an external pullup resistor on the RESET pin - simplifying schematic design and improving noise immunity.
How is the POK1 output used in power sequencing with the MAX6744XKZGD3+?
The POK1 output on the MAX6744XKZGD3+ is an open-drain active-high signal that remains low until VCC1 exceeds 2.313V for at least 37.5ms. It is typically pulled up to VCC1 via an external resistor and used to enable the VCC2 regulator - ensuring VCC2 powers up only after VCC1 is fully stabilized, preventing sequencing violations in dual-rail systems.
What is the supply current consumption of the MAX6744XKZGD3+ at room temperature?
The MAX6744XKZGD3+ draws 6µA typical supply current (ICC1) at +25°C with VCC1 = 3.3V and no reset asserted. This ultra-low quiescent current is measured across the full operating voltage range (1.2V to 5.5V) and makes the MAX6744XKZGD3+ suitable for battery-critical applications like wearables and remote sensors.
Is the MAX6744XKZGD3+ pin-compatible with other devices in the MAX6736–MAX6745 family?
No - the MAX6744XKZGD3+ uses a unique pinout within the SC70-5 package: Pin 4 is POK1, whereas MAX6736/MAX6737 use Pin 4 for MR and MAX6742/MAX6745 use Pin 4 for PFI. Pin compatibility is not guaranteed across the family; PCB layout must match the specific variant's pin configuration shown in the datasheet's Pin Configurations section.
MAX6744XKZGD3+ 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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.11V, 2.313V
- 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
MAX6744XKZGD3+ FAQ
1.How can I place an order for MAX6744XKZGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6744XKZGD3+ 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 MAX6744XKZGD3+ reliable?
The price and inventory of MAX6744XKZGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6744XKZGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6744XKZGD3+?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6744XKZGD3+?
MAX6744XKZGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6744XKZGD3+ 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 MAX6744XKZGD3+?
For technical support, including MAX6744XKZGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6744XKZGD3+ requirements.
6.How does Aetrix verify that MAX6744XKZGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6744XKZGD3+ 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 MAX6744XKZGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6744XKZGD3+?
All MAX6744XKZGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6744XKZGD3+, 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 MAX6744XKZGD3+ part is unused and in its original packaging.
Return procedure for MAX6744XKZGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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