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Analog Devices Inc./Maxim Integrated MAX6744XKYHD3+
- Part No.:
- MAX6744XKYHD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX6744XKYHD3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:413
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Product details
Overview
MAX6744XKYHD3+ 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 2.188V (VCC1) and 1.575V (VCC2). It asserts reset if either supply falls below its threshold, maintains reset for ≥150ms after recovery, and draws only 6µA supply current. It is used in power-supply sequencing for dual-rail processors in portable embedded systems.
For engineers reviewing the MAX6744XKYHD3+ datasheet, MAX6744XKYHD3+ pinout, MAX6744XKYHD3+ application, or MAX6744XKYHD3+ equivalent, key selection criteria include its POK1 timing (37.5–75ms), dual fixed-threshold supervision, SC70-5 package footprint, and compatibility with core/I/O voltage sequencing requirements in battery-powered controllers and POS terminals.
Technical Context
The MAX6744XKYHD3+ implements independent dual-supply monitoring with precision internal voltage references for VCC1 and VCC2, each with 0.5% hysteresis. Its POK1 output is an open-drain active-high signal that deasserts only after VCC1 exceeds 2.188V for ≥37.5ms - enabling controlled enablement of downstream VCC2 regulators.
Reset assertion is triggered by falling VCC1, falling VCC2, or manual reset input (MR); however, MR is not present on MAX6744 - confirming this variant relies solely on supply monitoring and POK1 sequencing logic. The device operates across –40°C to +85°C and requires no external components for basic supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.188V ±1.5% - sets power-good detection point for primary I/O supply |
| VCC2 Threshold | 1.575V ±1.5% - monitors secondary core supply with guaranteed margin over 1.5V logic rails |
| Reset Timeout | 150ms min - ensures µP remains held in reset long enough for stable power ramp-up |
| POK1 Timeout | 37.5ms min - provides clean, glitch-free enable signal for sequenced VCC2 regulator control |
| Supply Current | 6µA max - enables multi-year operation in coin-cell–powered backup circuits |
| Operating Temp | –40°C to +85°C - supports industrial and automotive-adjacent embedded applications |
| Package | 5-pin SC70 - 2.0mm × 1.25mm footprint ideal for space-constrained portable PCBs |
Pinout & Package
MAX6744XKYHD3+ is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for high-density portable designs. Pin 1 is RESET (push-pull active-low), Pin 2 is GND, Pin 3 is VCC2, Pin 4 is POK1 (open-drain active-high), and Pin 5 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Push-pull active-low reset output | Drives µP reset pin directly without external pullup; sinks/source capability supports bidirectional µP interfaces |
| 2 - GND | Analog/digital ground reference | Single ground pin shared across all internal comparators and timing circuits; must be low-impedance |
| 3 - VCC2 | Secondary supply input (core rail) | Monitored at 1.575V threshold; valid reset assertion requires VCC2 ≥1.2V per spec |
| 4 - POK1 | Open-drain active-high power-OK output | Used to enable VCC2 regulator only after VCC1 stabilizes; requires external pullup to VCC1 or system rail |
| 5 - VCC1 | Primary supply input (I/O rail) | Monitored at 2.188V threshold; powers internal circuitry and serves as reference for POK1 and RESET logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold supervision | Simultaneously monitors 2.188V (VCC1) and 1.575V (VCC2) with <±1.5% tolerance - eliminates need for external resistor dividers |
| VCC1 Power-OK (POK1) output | Provides clean, timed enable signal for VCC2 regulators - prevents race conditions during power-up sequencing |
| 150ms minimum reset timeout | Guarantees µP reset hold time exceeds typical DC/DC converter startup delays and capacitor charging times |
| 6µA ultra-low quiescent current | Enables integration into always-on subsystems (e.g., RTC backup, wake-on-event logic) without measurable battery drain |
| SC70-5 package | Reduces board area by >50% vs. SOT23-5 - critical for handheld medical devices and compact IoT nodes |
Applications
| Power-Supply Sequencing for Dual-Rail Processors | Battery-Powered Embedded Controllers |
|---|---|
Use Scenario: A dual-core SoC requires I/O supply (VCC1) to stabilize before enabling core supply (VCC2) to prevent latch-up or configuration corruption. IC Role / Device Role / Timing Role: MAX6744XKYHD3+ monitors VCC1 and asserts POK1 only after it exceeds 2.188V for ≥37.5ms; POK1 then enables the VCC2 regulator. Use Value: Eliminates need for discrete RC timers or FPGA-based sequencing logic - reduces BOM count and layout complexity. | Use Scenario: A handheld diagnostic instrument uses a lithium coin cell to maintain real-time clock and sensor bias during sleep mode. IC Role / Device Role / Timing Role: MAX6744XKYHD3+ continuously supervises both main and backup rails with 6µA current draw, asserting RESET if either drops below threshold. Use Value: Extends battery life beyond 5 years in low-duty-cycle applications while guaranteeing reliable cold-start behavior. |
| POS Terminal Power Integrity | Industrial PLC I/O Module Supervision |
Use Scenario: A point-of-sale terminal experiences frequent brownouts due to shared AC outlets and USB peripheral loads. IC Role / Device Role / Timing Role: MAX6744XKYHD3+ detects dips on 3.3V I/O and 1.8V core rails simultaneously and holds µP in reset until both recover for ≥150ms. Use Value: Prevents corrupted transaction logs and EEPROM writes during marginal supply conditions - improves field reliability. | Use Scenario: An industrial programmable logic controller module must survive wide temperature swings and EMI-rich factory environments. IC Role / Device Role / Timing Role: MAX6744XKYHD3+ operates from –40°C to +85°C with 0.5% threshold hysteresis, rejecting transient noise on 24V-derived 3.3V/1.5V rails. Use Value: Delivers deterministic reset behavior without external filtering - reduces qualification test cycles and firmware guardbanding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6741XKYHD3+ | Same dual-fixed thresholds (2.188V/1.575V), same POK1 function, but open-drain RESET output requiring external pullup | Suitable where µP reset pin is open-drain or bidirectional; less drive strength than push-pull | Select MAX6741XKYHD3+ only when interfacing with legacy µPs requiring open-drain reset signaling |
| TPS3808G18DBVR | Single-supply supervisor (1.8V threshold only); no POK1 output; 350ms reset timeout; SOT23-6 package | Lacks dual-rail monitoring and sequencing capability - requires additional ICs for VCC2 supervision | Choose TPS3808G18DBVR only for single-rail systems where cost-per-channel is prioritized over integration |
Compared with MAX6741XKYHD3+, the MAX6744XKYHD3+ offers direct-drive push-pull RESET for simplified µP interface; compared with TPS3808G18DBVR, it delivers integrated dual-supply monitoring and power-sequencing in one SC70-5 device - reducing component count and PCB area by 33% in multi-rail designs.
Availability
MAX6744XKYHD3+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage systems, and notebook computers requiring stable component supply and long-term lifecycle support.
Supply support for MAX6744XKYHD3+ 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 in industrial, computing, and consumer markets.
The MAX6736–MAX6745 family was engineered specifically for low-power, space-constrained dual- and triple-voltage microprocessor supervision - emphasizing ultra-low ICC, factory-trimmed accuracy, and integrated sequencing features like POK1.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6744XKYHD3+?
The MAX6744XKYHD3+ has factory-trimmed reset thresholds of 2.188V for VCC1 and 1.575V for VCC2, with ±1.5% tolerance over –40°C to +85°C. These values are confirmed in Table 1 of the datasheet under suffix "Y" (VCC1) and "V" (VCC2), and are not adjustable. The thresholds are internally generated and require no external components.
Does the MAX6744XKYHD3+ include a manual reset (MR) input?
No, the MAX6744XKYHD3+ does not include a manual reset (MR) input. Per the Selector Guide and Pin Description table, MR is absent on MAX6744/MAX6741 variants. Reset is asserted solely based on VCC1 and VCC2 voltage levels. This distinguishes it from MAX6736–MAX6739 and MAX6740/MAX6743, which feature dedicated MR pins.
What is the function and timing behavior of the POK1 output on the MAX6744XKYHD3+?
The POK1 output on the MAX6744XKYHD3+ is an open-drain active-high signal that goes high only after VCC1 exceeds 2.188V for ≥37.5ms (tPOKP min). It remains high until VCC1 falls below threshold, and its logic is independent of VCC2 or RESET state. This enables precise control of VCC2 regulator enable timing without µP intervention.
Can the MAX6744XKYHD3+ be used to monitor a negative supply voltage?
No, the MAX6744XKYHD3+ cannot directly monitor negative supplies. Its VCC1, VCC2, and POK1 pins are referenced to GND and rated for 0V to +6V. While the MAX6742/MAX6745 family members support negative monitoring via PFI/PFO, MAX6744 lacks PFI and PFO pins - confirmed by its pin configuration diagram showing only RESET, GND, VCC2, POK1, and VCC1.
What package type and dimensions does the MAX6744XKYHD3+ use?
The MAX6744XKYHD3+ uses a 5-pin SC70-5 package measuring 2.0mm × 1.25mm with 0.65mm lead pitch. This is verified in the Ordering Information section and Pin Configurations diagram. The SC70-5 footprint is smaller than SOT23-5 by ~30% in area, supporting high-density portable PCB layouts.
MAX6744XKYHD3+ 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:
- 1.313V, 2.188V
- 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
MAX6744XKYHD3+ FAQ
1.How can I place an order for MAX6744XKYHD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6744XKYHD3+ 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 MAX6744XKYHD3+ reliable?
The price and inventory of MAX6744XKYHD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6744XKYHD3+ is usually 5 days.
3.What payment methods are accepted for MAX6744XKYHD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6744XKYHD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6744XKYHD3+?
MAX6744XKYHD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6744XKYHD3+ 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 MAX6744XKYHD3+?
For technical support, including MAX6744XKYHD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6744XKYHD3+ requirements.
6.How does Aetrix verify that MAX6744XKYHD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6744XKYHD3+ 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 MAX6744XKYHD3+ meets industry standards.
7.What is the process for return or replacement of MAX6744XKYHD3+?
All MAX6744XKYHD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6744XKYHD3+, 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 MAX6744XKYHD3+ part is unused and in its original packaging.
Return procedure for MAX6744XKYHD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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