TC74LCX244FK(EL,K)

Overview

The TC74LCX244FK is a low-voltage octal bus buffer manufactured by Toshiba Semiconductor and Storage. It features non-inverting logic with two active-low output enables and provides three-state outputs. The device supports a supply voltage range of 1.65 V to 3.6 V, ensuring compatibility with 3.3-V systems while maintaining CMOS low power dissipation. It offers high-speed operation with a maximum propagation delay of 6.5 ns at 3.0 to 3.6 V. The component includes power-down protection on all inputs and outputs and is pin-compatible with the standard 74 series 244 type.

Feature Summary

• Provides high-speed data buffering for 3.3-V systems while maintaining low power consumption.
• Features 5-V tolerant inputs and outputs, allowing safe interfacing with 5-V supply environments.
• Includes power-down protection circuits on all inputs and outputs to prevent excessive current draw during power-off states.

Applications

• Used as a memory address driver in 3-state memory systems.
• Interfaces between 3.3-V logic domains and 5-V tolerant peripherals.
• Octal bus buffering applications requiring high-speed data transfer.

Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the FK suffix denotes the VSSOP (US) package. Confirm RoHS compliance status directly with the manufacturer or authorized distributors, as environmental declarations may vary by production batch. Ensure the design accounts for the specified operating temperature range of -40°C to 85°C. Review the latest datasheet revision for any updates to electrical characteristics or absolute maximum ratings before finalizing procurement specifications.

Selection Notes

Select this component when an octal buffer is needed for 3.3-V systems with 5-V tolerance requirements. It is suitable for designs requiring low quiescent current and high-speed performance. Consider the VSSOP package if space constraints exist, noting its lower weight compared to SOP variants. Ensure input signals do not exceed the 5.5 V limit under all operating conditions. Verify that the load capacitance and drive requirements align with the specified output current capabilities.

Part Context

This part belongs to the TC74LCX series of low-voltage CMOS logic devices from Toshiba. It is functionally equivalent to industry-standard 74LCX244 components. The device is designed to replace older 74AC/VHC/HC/F/ALS/LS types where lower voltage operation and reduced power consumption are prioritized. It shares the same pinout and logical functionality as the base 74 series 244 type, facilitating direct upgrades in existing designs.

Replacement Considerations

Direct replacements include other manufacturers' 74LCX244 equivalents in compatible packages. Verify pin compatibility and electrical characteristics such as propagation delay and output current. Ensure the substitute component supports the required 5-V tolerance and operates within the specified voltage range. Check for any differences in power-down protection features or package dimensions.