74ACT299MTR

Overview

The M74ACT299MTR is an advanced high-speed CMOS 8-bit parallel-in/parallel-out shift register with asynchronous clear and 3-state outputs. It operates within a supply voltage range of 4.5V to 5.5V, supporting a maximum clock frequency of 240MHz at 5V. The device features symmetrical output impedance with minimum drive currents of 24mA for both sourcing and sinking. Propagation delays from clock to output range from 1.0ns to 16.0ns depending on temperature conditions. Quiescent supply current is limited to a maximum of 8μA at 25°C.

Feature Summary

• Supports four operating modes: hold, shift left, shift right, and load data via function select inputs
• Features 3-state outputs controlled by active-low enable inputs for bus-oriented applications
• Includes asynchronous master reset input for immediate clearing of the register state
• Designed with protection circuits against static discharge providing 2kV ESD immunity

Applications

• Bus driver applications requiring 3-state control
• High-speed serial-to-parallel or parallel-to-serial data conversion
• Universal shift/storage registers in digital logic systems
• Interfaces between High Speed CMOS systems and TTL/NMOS/CMOS outputs

Procurement Notes

Verify that the ordering suffix TR indicates tape and reel packaging compatible with automated assembly equipment. Confirm the specific package variant (SOP, DIP, or TSSOP) matches the board layout requirements. Ensure the component meets the required operating temperature range of -55°C to +125°C for the intended environment. Cross-reference the manufacturer part number with official STMicroelectronics documentation to validate authenticity and revision status before procurement.

Selection Notes

Select this component when designing systems requiring high-speed data shifting with precise timing characteristics under a 5V supply. The ACT series offers improved latch-up immunity and lower power dissipation compared to standard AC families. Consider the pin and function compatibility with legacy 74 series 299 devices if migrating existing designs. Evaluate the propagation delay specifications against system clock speeds to ensure signal integrity across the full operating temperature range.

Part Context

This device belongs to the 74ACT family of advanced CMOS logic components manufactured by STMicroelectronics. It is functionally compatible with the industry-standard 74 series 299 universal shift register. The product utilizes sub-micron silicon gate and double-layer metal wiring C2MOS technology to achieve high performance while maintaining low power consumption suitable for modern digital electronics.

Replacement Considerations

The 74ACT299B and 74ACT299TTR are alternative package variants of the same functional device. Other manufacturers such as Fairchild Semiconductor offer equivalent parts like the 74ACT299MTC. Verify pinout compatibility and electrical specifications when substituting with non-STMicroelectronics equivalents.