Texas Instruments SN74AUC16240ZQLR

Summary of SN74AUC16240ZQLR Texas Instruments 16-bit buffer and driver

The SN74AUC16240ZQLR from Texas Instruments is a 16-bit buffer/driver belonging to the Widebus™ family, designed to support high-density bus-oriented data paths in modern digital systems. As an inverting buffer/driver with 3-state outputs, it is especially tailored for low-voltage operations, providing engineers with reliable signal isolation and level shifting in a wide range of applications. This device is available in a compact 56-ball MicroStar Junior BGA package (7x4.5 mm), suited for high-density mounting in space-constrained layouts.

Main functions and advantages of SN74AUC16240ZQLR

SN74AUC16240ZQLR stands out for its optimized performance at a supply voltage (V_CC) range of 1.65 V to 1.95 V, with operability down to 0.8 V and maximum tolerance up to 3.6 V on inputs and outputs. The wide input/output voltage tolerance enables it to interface seamlessly with mixed-voltage systems. Its key electrical advantages include ultra-fast propagation delay (t_pd) as low as 2 ns at 1.8 V, low quiescent current (max I_CC of 20 μA), and strong ±8 mA output drive at 1.8 V.

For robust performance, the SN74AUC16240ZQLR incorporates partial-power-down support via I_off circuitry, preventing backflow when the device is powered down—crucial in systems where signals may persist on the bus during power transitions. Reliability is further enhanced by its high tolerance to latch-up (exceeding 100 mA per JESD 78, Class II) and comprehensive ESD protection levels (2000 V HBM, 200 V MM, 1000 V CDM per JESD 22). The symmetrical active-low output enables provide engineers flexibility in logic design, while three-state outputs allow the device to support multiplexed or shared bus architectures efficiently.

Electrical specifications and standard performance metrics of SN74AUC16240ZQLR

The electrical design of SN74AUC16240ZQLR is defined by its strong tolerance to a variety of operating and stress conditions:

Absolute maximum supply voltage: -0.5 V to 3.6 V

Maximum input/output voltage: -0.5 V to 3.6 V

Output drive capability: ±20 mA continuous output current

Quiescent current: max 20 μA at room temperature

Propagation delay: t_pd at 2 ns typical at 1.8 V

Input clamp and output clamp currents: up to -50 mA

Thermal characteristics (θ_JA): 42°C/W for GQL package

It is essential in practical engineering to tie all unused inputs to V_CC or GND to prevent floating conditions that may cause unpredictable logic states. When utilizing three-state operation, a recommended pull-up resistor ensures proper high-impedance behavior on power-up or down, especially in partial-power-down conditions.

Usage examples and technical factors for SN74AUC16240ZQLR

The SN74AUC16240ZQLR is engineered for applications where high-speed, low-voltage, and high-density buffering is required. Its primary uses include acting as memory address drivers, clock drivers, or as bus-oriented receivers and transmitters—typical in computing, networking, or embedded systems requiring signal integrity across multiple voltage domains.

Its ability to function as four 4-bit buffers, two 8-bit buffers, or a single 16-bit buffer provides valuable flexibility in board design and pinout configuration. Designers must consider that all unused input pins must be tied off to avoid erratic operation due to high-impedance floating CMOS inputs, a standard practice detailed in related TI application reports.

When integrating SN74AUC16240ZQLR into partial-power-down designs, ensuring that the I_off feature is properly leveraged will help maintain signal integrity during power sequencing events. The strong ESD and latch-up immunity also make it suitable for deployment in harsh operating environments or in systems with strict reliability requirements.

Package details, physical properties, and environmental specifications for SN74AUC16240ZQLR

The 56-ball MicroStar Junior BGA package of SN74AUC16240ZQLR (7x4.5 mm typically) provides engineers with a high-density, low-profile option conducive to space-constrained layouts found in portable or high-volume networked devices. The package is compliant with RoHS and is classified as “Green” according to Texas Instruments standards, ensuring halogen-free and environmentally conscious manufacturing.

Thermal, solderability, and board assembly details follow the guidelines of JEDEC standards (e.g., MO-194 for BGAs), and designers should reference TI’s provided mechanical data for accurate PCB footprint and stencil design. Moisture Sensitivity Level (MSL) is specified for consistent SMT process integration, mitigating the risk of package-induced failures.

Alternative or substitute models for SN74AUC16240ZQLR

In the evolving marketplace of logic buffer/drivers, engineers may consider equivalent or replacement models for the SN74AUC16240ZQLR depending on availability, cost, or system requirements. In the Texas Instruments portfolio, closely related models within the SN74AUC16240 series may be available with different package options or minor specification variations. Additionally, other Widebus™ family members supporting similar voltage and current profiles might be suitable replacements, provided they meet the application-specific form factor and performance needs. When considering substitutes, it is vital to cross-examine voltage tolerance, output drive strength, propagation delay, and package thermal characteristics.

Conclusion

: SN74AUC16240ZQLR in modern circuit design

The SN74AUC16240ZQLR from Texas Instruments offers a robust solution for engineers seeking high-speed, low-voltage, and reliable logic buffering in a modern, high-density package. Its feature set is tailored for the demands of contemporary digital backplanes and multi-voltage systems. Thorough application of the electrical, mechanical, and operational insights can ensure successful integration in projects spanning consumer, industrial, and networking sectors. For engineers and procurement specialists, considering SN74AUC16240ZQLR alongside its equivalents ensures resilient design paths in both development and long-term support contexts.