SN74HCT245NE4

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HCT245NE4 is an octal bus transceiver with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features high-current outputs capable of driving up to 15 LSTTL loads directly. The device provides balanced propagation delay, typically 14 ns at 5 V, and offers ±6-mA output drive current. It utilizes TTL-voltage compatible inputs while maintaining low power consumption with a maximum static supply current of 80 µA.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional data transmission between two 8-bit buses controlled by a direction input
• Active-low output enable isolates the buses when asserted
• TTL-compatible inputs ensure compatibility with standard logic families
• High-current 3-state outputs provide direct drive capability for bus lines

Buffers, Drivers, Receivers, Transceivers Applications

• Factory automation and control systems
• Grid infrastructure equipment
• Electronic point of sale terminals
• Multi-function printers
• Motor drives and storage systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the package type matches the required PCB footprint, specifically the 20-pin PDIP configuration for the NE4 suffix. Confirm that the operating temperature range meets the environmental requirements of the target application. Ensure that the ESD protection ratings are sufficient for the manufacturing handling processes in use.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when interfacing 5-V CMOS buses with TTL-compatible devices or when increased drive strength is necessary for long traces. Consider the bidirectional nature of the transceiver for applications requiring data flow in both directions. Evaluate the thermal resistance values if the device will operate under high load conditions or elevated ambient temperatures.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SNx4HCT245 family of octal bus transceivers. The 'HCT' designation indicates High-speed CMOS technology with TTL-compatible inputs. The 'NE4' suffix specifies the PDIP-20 through-hole package and lead-free composition. This series is designed for asynchronous communication and bus isolation in digital logic systems.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HCT245N

Buffers, Drivers, Receivers, Transceivers FAQ

How does the direction control pin function?

The DIR input determines the data flow direction. A high level enables transmission from the A bus to the B bus, while a low level enables transmission from the B bus to the A bus.

What is the effect of the output-enable pin?

When the OE input is high, all ports enter a high-impedance mode, effectively isolating the buses. When low, the device becomes active and allows data transmission based on the direction setting.

Can unused inputs be left floating?

No, all unused inputs must be connected to either VCC or GND to prevent undefined operational states and excessive power consumption caused by floating CMOS inputs.