74ACT245TTR

Buffers, Drivers, Receivers, Transceivers Overview

The STMicroelectronics 74ACT245TTR is an octal bus transceiver with 3-state outputs, fabricated using sub-micron silicon gate C2MOS technology. It operates within a supply voltage range of 4.5V to 5.5V and supports a typical propagation delay of 5.4ns at VCC = 5V. The device features symmetrical output impedance with minimum source/sink currents of 24mA. It provides 2KV ESD immunity and is compatible with TTL outputs, featuring input levels of VIH = 2V (min) and VIL = 0.8V (max). The component is housed in a TSSOP-20 package.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Advanced high-speed CMOS fabrication for two-way asynchronous communication between data buses
• Directional control via DIR input and device isolation capability through the G enable input
• Direct interface capability with High Speed CMOS systems alongside TTL, NMOS, and CMOS output voltage levels
• Integrated protection circuits against static discharge providing 2KV ESD immunity

Buffers, Drivers, Receivers, Transceivers Applications

• Two-way asynchronous communication between data buses
• Interfacing High Speed CMOS systems with TTL, NMOS, and CMOS output voltage levels
• Driving 50Ω transmission lines

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the ordering code matches the specific TSSOP-20 package configuration required for the application. Confirm the presence of the 'TTR' suffix indicates tape and reel packaging rather than tube packaging. Ensure compatibility with the specified operating temperature range of -55°C to 125°C for the intended environment. Cross-reference the datasheet revision date to ensure all electrical characteristics align with current design requirements.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when bidirectional data transfer is required between buses with differing logic families. The ACT series offers improved speed over standard AC/HC counterparts while maintaining CMOS power dissipation. Verify that the 24mA drive strength meets the load requirements of the destination bus. Consider the TSSOP-20 package dimensions if space constraints are a primary factor in the PCB layout.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the 74ACT245 family of octal bus transceivers manufactured by STMicroelectronics. It shares pinout and functional compatibility with other 74-series 245 devices but utilizes advanced CMOS technology for higher speed and lower power consumption. The TTR variant specifically denotes the TSSOP-20 surface-mount package delivered in tape and reel format for automated assembly processes.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Check for direct replacements from other manufacturers such as ON Semiconductor or Fairchild under the same 74ACT245 designation. Verify that any substitute maintains the TSSOP-20 package footprint and the specific electrical characteristics regarding propagation delay and output drive current.