SN74ALS245ANS

Overview

The SN74ALS245ANS is an octal bus transceiver with three-state outputs manufactured by Texas Instruments. It operates on a supply voltage of 4.5V to 5.5V and features a maximum propagation delay of 5.5ns at 5V. The device utilizes PNP inputs to reduce DC loading and allows asynchronous two-way communication between data buses. Data transmission direction from the A bus to the B bus or vice versa 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
• Direction control minimizes external timing requirements
• Three-state outputs drive bus lines directly

Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and signal buffering
• Clock drivers

Procurement Notes

Verify the specific ordering suffix matches the required package type and tape-and-reel specifications. Confirm RoHS compliance status and moisture sensitivity level ratings against project requirements. Ensure the operating temperature range aligns with environmental conditions. Check for any recent product life cycle changes or obsolescence notices before finalizing procurement.

Selection Notes

Select this component for applications requiring high-speed bidirectional data transfer with low DC loading. The ALS logic family offers faster switching speeds compared to standard LS series. Consider the -1 version if higher output current capability is necessary. Ensure unused inputs are tied to VCC or GND to prevent floating states.

Part Context

This part belongs to the SN54/74(ALS,AS)245(A) family of octal bus transceivers. It is designed for use in systems where multiple devices share a common data bus. The device provides isolation capabilities and directional control, making it suitable for complex digital systems requiring efficient data routing.

Replacement Considerations

SN74ALS245A-1NSR

FAQ

How is the data transmission direction controlled?

The direction is determined by the logic level at the DIR input. High selects A-to-B, and Low selects B-to-A.

What is the function of the OE input?

The Output Enable (OE) input disables the device, effectively isolating the buses when held at a high logic level.