CD74HC245E-NG

Overview

The CD74HC245E-NG is an octal bus transceiver with three-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports a wide operating temperature range from -55°C to 125°C. The device features buffered inputs, non-inverting logic, and high drive current outputs capable of driving up to 15 LSTTL loads. Typical propagation delay is 9 ns at 5 V with a 15 pF load.

Feature Summary

• Octal bidirectional data transmission controlled by DIR and OE pins
• Three-state outputs for effective bus isolation
• High noise immunity with input/output leakage currents as low as 1 µA

Applications

• Asynchronous two-way communication between data buses
• Bus line driving capability for large bus capacitances
• Low power consumption applications requiring LSTTL speed compatibility

Procurement Notes

Verify the specific package type (PDIP or SOIC) and suffix against the official TI orderable addendum. Confirm RoHS compliance status and moisture sensitivity level ratings prior to procurement. Ensure the ordering part number matches the required lead finish and production status listed in the manufacturer's documentation.

Selection Notes

Select this component for designs requiring high-speed CMOS performance with LSTTL drive capabilities. Verify that the operating voltage falls within the 2 V to 6 V range. Consider the extended temperature range (-55°C to 125°C) for industrial or military environments. Ensure unused inputs are tied to logic high or low to prevent undefined states.

Part Context

This device belongs to the CDx4HC(T)245 family of high-speed CMOS logic octal-bus transceivers. It provides balanced propagation delays and transition times while significantly reducing power consumption compared to LSTTL logic ICs. The HC variant offers wide voltage operation, whereas HCT variants provide direct LSTTL input compatibility.

Replacement Considerations

CD74HC245E

FAQ

How does the output enable (OE) pin function?

When the OE input is high, the I/O ports enter a high-impedance state, effectively isolating the bus.

What determines the direction of data flow?

The logic level at the direction (DIR) input determines whether data flows from the A bus to the B bus or vice versa.