MC74HCT245ADTR2G-Q

Overview

The MC74HCT245ADTR2G-Q is an octal, 3-state noninverting bus transceiver manufactured by onsemi. It operates within a supply voltage range of 4.5 V to 5.5 V and utilizes TSSOP-20 packaging. The device features a direction control pin for bidirectional data flow between ports A and B, and an active-low output enable pin for high-impedance isolation. It provides drive capability equivalent to 15 LSTTL loads with low input current characteristics.

Feature Summary

• Provides bidirectional asynchronous communication between two data buses via dedicated direction control
• Features active-low output enable to isolate I/O ports into a high-impedance state
• Outputs directly interface to CMOS, NMOS, and TTL logic families
• Includes automotive qualification suffix ensuring unique site and control change requirements

Applications

• Interfacing TTL or NMOS outputs to high-speed CMOS inputs
• Two-way asynchronous communication between data buses
• Automotive electronic systems requiring specific quality control standards

Procurement Notes

Verify the presence of the -Q suffix to confirm automotive-grade manufacturing compliance. Ensure the package type matches the required TSSOP-20 footprint. Confirm RoHS and halogen-free status against project specifications. Validate that the operating temperature range meets environmental requirements.

Selection Notes

Select this component when interfacing between different logic families such as TTL and CMOS. The HCT series ensures compatibility with standard TTL input levels while maintaining CMOS noise immunity. Consider the bidirectional nature of the transceiver for complex bus architectures requiring flexible data routing.

Part Context

This part belongs to the MC74HCT245A family of octal bus transceivers. It shares identical pinouts with LS245 devices, facilitating direct replacement in legacy designs. The -Q suffix denotes adherence to AEC-Q100 standards and PPAP capabilities for specialized industrial applications.

Replacement Considerations

MC74HC245ADTR2G-Q

FAQ

How does the device handle data direction?

Data direction is controlled by a dedicated Direction pin. Logic High transmits data from Bus A to Bus B, while Logic Low transmits from Bus B to Bus A.

What is the function of the Output Enable pin?

The Output Enable pin is active-low. When asserted low, the transceiver operates normally. When high, all outputs enter a high-impedance state, isolating the buses.