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Analog Devices Inc./Maxim Integrated MAX6744XKWGD3+
- Part No.:
- MAX6744XKWGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX6744XKWGD3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
The MAX6744XKWGD3+ 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 2.925V (VTH1) and 1.575V (VTH2). It monitors I/O and core supply rails in portable systems, asserts reset when either supply drops below its threshold, maintains reset for ≥150ms after recovery, and draws only 6µA typical supply current. It is used in notebook computers and multivoltage embedded controllers requiring precise power sequencing.
For engineers reviewing the MAX6744XKWGD3+ datasheet, MAX6744XKWGD3+ pinout, MAX6744XKWGD3+ application, or MAX6744XKWGD3+ equivalent, key selection criteria include its dual fixed-threshold supervision (2.925V/1.575V), POK1 output for VCC1-to-VCC2 sequencing, 150ms reset timeout, SC70-5 package, and -40°C to +85°C industrial temperature range.
Technical Context
The MAX6744XKWGD3+ implements two independent voltage comparators with precision internal references (0.488V bandgap-derived) to monitor VCC1 and VCC2 against factory-set thresholds. Its POK1 output is an open-drain active-high signal that deasserts only after VCC1 exceeds VTH1 for 37.5–75.0ms, enabling controlled power-up sequencing of downstream regulators.
It features a push-pull RESET output referenced to VCC1, eliminating external pullup requirements, and includes robust transient immunity: reset is not asserted for VCC1/VCC2 transients shorter than ~35µs at 100mV overdrive. The device operates across 1.0–5.5V VCC1 and 0.9–3.3V VCC2 ranges with guaranteed reset assertion down to VCC1 = 1.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTH1 / VTH2 | 2.925V / 1.575V - factory-trimmed thresholds for primary (I/O) and secondary (core) supply monitoring |
| Reset Timeout (tRP) | 150ms min - ensures µP remains held in reset long enough for stable power rail recovery |
| POK1 Timeout (tPOKP) | 37.5–75.0ms - defines minimum VCC1 stabilization time before enabling VCC2 via POK1 |
| Supply Current (ICC1) | 6µA typ - enables battery-powered operation with minimal quiescent drain |
| Operating Temp Range | -40°C to +85°C - qualified for industrial and portable equipment environments |
| Package | 5-pin SC70 - 2.0mm × 1.25mm footprint ideal for space-constrained PCB layouts |
| RESET Output Type | Push-pull - drives high/low actively; no external pullup required for µP reset interface |
Pinout & Package
MAX6744XKWGD3+ is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), with pins arranged as follows (top view): Pin 1 = RESET, Pin 2 = GND, Pin 3 = VCC2, Pin 4 = POK1, Pin 5 = VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; asserts low if VCC1 < 2.925V or VCC2 < 1.575V; deasserts only after both exceed thresholds for ≥150ms |
| 2 - GND | Analog/digital ground reference | Common return path for all internal comparators, timers, and output drivers; must be low-impedance |
| 3 - VCC2 | Secondary supply input (core voltage) | Monitored against 1.575V threshold; supports 0.9V–3.3V range; valid reset assertion requires VCC2 ≥ 1.2V |
| 4 - POK1 | Open-drain active-high VCC1 power-OK output | Stays low until VCC1 ≥ 2.925V for ≥37.5ms; used to enable VCC2 regulator or control power sequencing logic |
| 5 - VCC1 | Primary supply input (I/O voltage) | Monitored against 2.925V threshold; supports 1.0V–5.5V range; powers internal circuitry and RESET/POK1 drivers |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold supervision | Simultaneously monitors 2.925V (VCC1) and 1.575V (VCC2) without external resistors or trimming |
| VCC1 Power-OK (POK1) output | Enables precise power-up sequencing by delaying VCC2 activation until VCC1 stabilizes for ≥37.5ms |
| 150ms minimum reset timeout | Guarantees µP reset hold time sufficient for full power rail settling and oscillator startup |
| 6µA typical supply current | Extends battery life in portable devices; ICC1 remains stable across -40°C to +85°C |
| Push-pull RESET output | Eliminates need for external pullup resistor, reducing BOM count and layout complexity |
Applications
| Power-Supply Sequencing | Notebook Computer Power Management |
|---|---|
|
Use Scenario: Dual-rail system where I/O supply (VCC1) must stabilize before enabling core supply (VCC2). IC Role / Device Role / Timing Role: MAX6744XKWGD3+ monitors VCC1 and asserts POK1 only after it exceeds 2.925V for ≥37.5ms, enabling VCC2 regulator via external MOSFET or enable pin. Use Value: Prevents core logic corruption during power-up by enforcing strict VCC1-first sequencing, eliminating need for discrete timing RC networks. |
Use Scenario: Portable computing platform with separate 3.3V I/O and 1.5V core supplies. IC Role / Device Role / Timing Role: MAX6744XKWGD3+ supervises both rails, asserts RESET if either drops below threshold, and uses POK1 to gate VCC2 enable during boot. Use Value: Ensures reliable cold-start and brownout recovery while consuming only 6µA, extending battery runtime between charges. |
| Industrial Controller Reset Management | POS Terminal Voltage Monitoring |
|
Use Scenario: Programmable logic controller (PLC) module operating in harsh industrial environments with noisy 24V DC input. IC Role / Device Role / Timing Role: MAX6744XKWGD3+ monitors regulated 3.3V (VCC1) and 1.5V (VCC2) outputs from DC/DC converters, asserting RESET on undervoltage events. Use Value: Provides deterministic reset behavior with 150ms timeout and >35µs glitch immunity, preventing spurious resets from line transients. |
Use Scenario: Point-of-sale terminal with battery-backed real-time clock and main processor. IC Role / Device Role / Timing Role: MAX6744XKWGD3+ supervises main 3.3V rail (VCC1) and 1.5V SoC core rail (VCC2); POK1 controls backup power switchover logic. Use Value: Guarantees clean processor reset during AC loss or battery swap, avoiding data corruption in transaction logs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6741XKWGD3+ | Identical pinout, same 2.925V/1.575V thresholds and 150ms timeout, but features open-drain RESET (not push-pull) and same POK1 functionality | Requires external pullup on RESET for µP interface; suitable where board already includes pullup or bidirectional reset I/O is needed | Select MAX6741XKWGD3+ only if open-drain RESET is required for level-shifting or wired-OR configurations |
| TPS3808G15DBVR | Single-supply supervisor (1.5V threshold only), SOT-23-6 package, 360ms timeout, 2.5µA supply current; lacks POK1 and dual-monitoring capability | Cannot replace MAX6744XKWGD3+ in dual-rail systems; limited to single-rail monitoring with longer timeout | Use TPS3808G15DBVR only for cost-sensitive single-supply applications where POK1 and VCC2 monitoring are unnecessary |
Compared with MAX6744XKWGD3+, MAX6741XKWGD3+ offers identical supervision accuracy and sequencing capability but requires external RESET pullup, while TPS3808G15DBVR reduces supply current but sacrifices dual-rail monitoring and POK1 functionality-making MAX6744XKWGD3+ uniquely suited for compact, sequenced dual-voltage systems.
Availability
MAX6744XKWGD3+ is available at Aetrix Electronics and suitable for notebook computers, industrial controllers, and POS terminals requiring stable component supply with guaranteed -40°C to +85°C operation and lead-free compliance.
Supply support for MAX6744XKWGD3+ 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 management, sensing, and interface applications.
The MAX6736–MAX6745 family delivers ultra-low-power dual/triple-voltage supervision for portable and multivoltage embedded systems, emphasizing small size (SC70), low ICC, and integrated sequencing features like POK1.
FAQ
What is the function of the POK1 pin on the MAX6744XKWGD3+?
The POK1 pin on the MAX6744XKWGD3+ is an open-drain active-high output that signals when the primary supply (VCC1) has exceeded its 2.925V reset threshold for at least 37.5ms. It is used to control power sequencing-for example, enabling a downstream VCC2 regulator only after VCC1 is stable. The MAX6744XKWGD3+ guarantees this timing behavior across -40°C to +85°C.
Does the MAX6744XKWGD3+ require external components for basic dual-supply supervision?
No, the MAX6744XKWGD3+ requires no external resistors or capacitors for basic dual-supply supervision. Its 2.925V and 1.575V reset thresholds are factory-trimmed, the 150ms reset timeout is internal, and the push-pull RESET output eliminates the need for an external pullup. Only decoupling capacitors (e.g., 0.1µF near VCC1) are recommended for noise immunity-no threshold-setting network is needed for the MAX6744XKWGD3+.
What is the minimum VCC1 voltage required for the MAX6744XKWGD3+ to assert a valid RESET?
The MAX6744XKWGD3+ guarantees valid RESET assertion and deassertion behavior only when VCC1 is ≥1.2V. Below 1.2V, the internal comparators and timer may not operate reliably. The device monitors VCC1 across a 1.0V–5.5V range, but functional reset operation-including accurate 2.925V threshold detection and 150ms timeout-is specified and guaranteed starting at VCC1 = 1.2V.
How does the MAX6744XKWGD3+ handle short voltage transients on VCC1 or VCC2?
The MAX6744XKWGD3+ provides inherent immunity to short-duration transients: it will not assert RESET for falling VCC1 or VCC2 glitches shorter than ~35µs when the voltage dip exceeds the threshold by 100mV. This prevents spurious resets during normal switching noise. For enhanced immunity, a 0.1µF ceramic capacitor placed close to the VCC1 pin is recommended per the MAX6744XKWGD3+ datasheet guidelines.
Is the MAX6744XKWGD3+ pin-compatible with other devices in the MAX6736–MAX6745 family?
The MAX6744XKWGD3+ shares the same 5-pin SC70-5 package and pinout (RESET, GND, VCC2, POK1, VCC1) with MAX6741, MAX6742, and MAX6745-but not with MAX6736–MAX6739 or MAX6740/MAX6743, which have different pin assignments (e.g., MR or RSTIN on Pin 3). Always verify pin function mapping using the MAX6744XKWGD3+ specific pin configuration diagram-not generic family diagrams-before PCB layout.
MAX6744XKWGD3+ 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, 1.665V
- 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
MAX6744XKWGD3+ FAQ
1.How can I place an order for MAX6744XKWGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6744XKWGD3+ 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 MAX6744XKWGD3+ reliable?
The price and inventory of MAX6744XKWGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6744XKWGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6744XKWGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6744XKWGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6744XKWGD3+?
MAX6744XKWGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6744XKWGD3+ 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 MAX6744XKWGD3+?
For technical support, including MAX6744XKWGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6744XKWGD3+ requirements.
6.How does Aetrix verify that MAX6744XKWGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6744XKWGD3+ 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 MAX6744XKWGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6744XKWGD3+?
All MAX6744XKWGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6744XKWGD3+, 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 MAX6744XKWGD3+ part is unused and in its original packaging.
Return procedure for MAX6744XKWGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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