STMicroelectronics 74LVC244ATTR

74LVC244ATTR STMicroelectronics Low-Voltage CMOS Bus Buffer Product Summary

The 74LVC244ATTR from STMicroelectronics is an octal non-inverting buffer/line driver designed for high-speed, low-power digital interface applications. Fabricated using advanced sub-micron silicon gate and double-layer metal wiring CMOS technology, this buffer operates with supply voltages from 1.65V to 3.6V and supports 3-state outputs. Its compatibility with 5V-tolerant inputs makes it especially useful for mixed-voltage systems—allowing seamless logic interfacing between 3.3V and legacy 5V buses. Offered in a compact 20-lead TSSOP package, the 74LVC244ATTR is engineered for demanding environments requiring robust ESD protection, low power consumption, and reliable transmission.

Functional Diagram and Application Areas of 74LVC244ATTR STMicroelectronics

The 74LVC244ATTR integrates two elements, each supporting four buffer channels, which collectively allow for precise and isolated signal driving across up to eight digital lines. Each channel provides a non-inverting logic buffer function with three-state output capability, enabling easy multiplexing and bus sharing in complex board architectures. Typical engineering applications include bus interfacing in data communication systems, peripheral address multiplexing in memory controllers, and high-throughput signal buffering in PCI bus subsystems. The device’s output enable controls are conveniently organized for coherent control of multiple channels, supporting streamlined address/data bus management.

Electrical Characteristics and Operating Conditions of 74LVC244ATTR STMicroelectronics

Performance-wise, the 74LVC244ATTR excels with propagation delay times (tPD) up to 5.9ns at 3V supply, achieved through efficient C²MOS processing. Its symmetrical output drive capability—delivering a minimum of 24mA at both high and low states when VCC = 3V—guarantees reliable bus levels for standard PCI interfaces and other high-current loads. Absolute maximum ratings should be strictly observed to avoid device damage, with all logic levels and current limits designed to meet the needs of advanced digital platforms. The device offers robust power-down protection circuitry on both inputs and outputs, ensuring data integrity and safeguarding the system during low-power states. Balanced propagation delays (tPLH ≈ tPHL) further facilitate timing-critical operations, reducing data skew in fast, synchronous designs.

Package Details, Pin Layout, and Mechanical Specifications for 74LVC244ATTR STMicroelectronics

For integration flexibility, the 74LVC244ATTR is specified in the industry-standard 20-lead TSSOP surface-mount package, facilitating high-density PCB layouts and automated assembly processes. Pin assignments are optimized for straightforward bus connections; the output, input, control, and VCC/GND terminals are clearly organized to support conventional bus buffering schematics. Detailed package drawings and mechanical dimensions are compliant with JEDEC standards, ensuring interoperability with automated placement equipment and reliability in long-term operation.

Performance Attributes and Reliability Metrics of 74LVC244ATTR STMicroelectronics

Key reliability metrics include latch-up immunity exceeding 500mA (JESD 17), enabling safe deployment in electrically challenging environments such as industrial control or automotive subsystems. Static discharge protection exceeds MIL STD 883 and industry benchmarks, with Human Body Model (HBM) ESD immunity above 2000V, and Machine Model thresholds at 200V. Combined with integrated protection circuits on all pins, the 74LVC244ATTR is engineered for robust handling during production, deployment, and field operation. Balanced output impedance and low internal capacitance also contribute to low-noise performance and predictable signal integrity, critical for modern high-speed bus architectures.

System Design Considerations and Selection Criteria for 74LVC244ATTR STMicroelectronics

Select the 74LVC244ATTR for designs requiring scalable output drive capability, tight timing margins, and power-efficient operation in bus-oriented systems. The device is particularly suited for 3.3V-centric digital designs with requirements for input compatibility with 5V sources, such as retrofitted embedded systems or migration projects. Consider compatibility with existing 74 Series 244 pinouts and logic functions to ensure seamless design upgrades and minimize requalification cycles. Its resilience to voltage overshoot and high ESD events makes it suitable for harsh deployment environments—maximize system reliability by leveraging these features for protected communication buses and sensitive digital interfaces.

Alternative and Equivalent Models for 74LVC244ATTR STMicroelectronics

Engineers searching for alternatives to the 74LVC244ATTR may evaluate bus buffers with comparable operating voltage ranges (1.65V–3.6V), 5V-compatible inputs, similar output drive capabilities, and three-state outputs. Common industry alternatives include other 74LVC244A series variants from STMicroelectronics, as well as pin/function-compatible octal bus buffers from vendors supporting the 74 series standard. Prioritize candidate models with matching package dimensions, ESD ratings, and propagation delay specifications for direct drop-in or minimal design adjustments.

Conclusion

: Summary and application perspectives for 74LVC244ATTR STMicroelectronics

In summary, the 74LVC244ATTR STMicroelectronics bus buffer delivers advanced features for power-conscious, high-speed digital designs, addressing key requirements for logic level shifting, bus signal integrity, and robust system integration. Its combination of low voltage operation, high output drive, reliable protection, and compatibility with legacy interfaces makes it an optimal choice for engineers and procurement professionals focused on future-proofing digital communication subsystems. When evaluating buffer solutions, the 74LVC244ATTR stands out for its balance of performance, reliability, and ease of adoption in modern and legacy system upgrades.