SN74ALS245ADB

Overview

The SN74ALS245ADB is an octal bus transceiver with 3-state outputs manufactured by Texas Instruments. It operates on a 4.5-V to 5.5-V supply voltage and features a maximum propagation delay of 5.5 ns at 5 V. The device utilizes PNP inputs to reduce DC loading and allows asynchronous two-way communication between data buses. Data transmission direction is controlled by the DIR input, while the OE input isolates the buses when disabled.

Feature Summary

• Supports asynchronous two-way communication between data buses
• Features PNP inputs to minimize DC loading
• Provides 3-state outputs capable of driving bus lines directly

Applications

• Asynchronous two-way communication between data buses
• Bus line driving applications
• System memory and control signal buffering

Procurement Notes

Verify the specific ordering suffix 'DB' corresponds to the SSOP-20 package configuration required for your design. Confirm that the operating temperature range aligns with your system requirements. Ensure all unused inputs are tied to VCC or GND to maintain proper device operation as specified in the datasheet guidelines.

Selection Notes

Select this component for designs requiring high-speed octal bus interfacing within standard logic families. Consider the ALS series characteristics for lower power consumption compared to standard TTL. Verify compatibility with your system's voltage levels and ensure the SSOP-20 package fits your PCB layout constraints.

Part Context

This part belongs to the SN54/74ALS245A family of octal bus transceivers. It is designed for general-purpose digital systems requiring bidirectional data transfer. The device is part of Texas Instruments' catalog of standard logic components, offering reliable performance for bus-oriented architectures in commercial and industrial environments.

Replacement Considerations

SN74ALS245ADWR

FAQ

How is the data transmission direction controlled?

The direction is determined by the logic level at the DIR input. A low level directs data from the A bus to the B bus, while a high level directs data from the B bus to the A bus.

What is the function of the OE input?

The output-enable (OE) input disables the device when active, effectively isolating the buses from each other to prevent interference during non-transmission periods.