74AC245B

Buffers, Drivers, Receivers, Transceivers Overview

The STMicroelectronics 74AC245B is an octal bus transceiver featuring three-state outputs and non-inverting logic. It operates within a supply voltage range of 2V to 6V, utilizing advanced high-speed CMOS technology with sub-micron silicon gate fabrication. The device provides symmetrical output impedance with a minimum source/sink current of 24mA at VCC = 3V. Typical propagation delay is 4.5ns at 5V, ensuring balanced timing characteristics. It includes protection circuits against static discharge, offering 2kV ESD immunity.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bidirectional data path with three-state outputs for bus-oriented applications
• Directional control via DIR input and enable/disable functionality via G input
• High noise immunity with defined thresholds relative to supply voltage
• Capable of driving 50Ω transmission lines with symmetrical output impedance

Buffers, Drivers, Receivers, Transceivers Applications

• Two-way asynchronous communication between data buses
• Bus-oriented memory and instrument control systems
• High-speed data transfer in parallel architectures

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific package variant required, as the base part number corresponds to multiple physical packages including DIP-20, SO-20, and TSSOP-20. Confirm that the ordering suffix matches the desired mechanical footprint. Note that this component is listed as obsolete by the manufacturer; ensure availability through authorized distributors or secondary markets before finalizing procurement plans.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring octal bidirectional buffering with high-speed CMOS performance. It is suitable for applications needing operation across a wide voltage range from 2V to 6V. Ensure the design accounts for the 50Ω transmission line driving capability and verify that the 24mA output drive strength meets the load requirements of the connected bus lines.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the 74AC series of high-speed CMOS logic components. It is functionally compatible with the 74LS244 and 74HC245 families but offers superior speed and lower power dissipation characteristics typical of AC technology. The octal configuration allows for simultaneous eight-bit data transfer, making it a standard solution for parallel bus interfaces in digital electronics.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Compatible substitutes include the MC74AC245 from ON Semiconductor and the SN74AC245 from Texas Instruments. These parts share identical pinouts and logical functions. Verify that any replacement maintains the same operating voltage range and package dimensions to ensure direct interchangeability without circuit redesign.