SCES883C December 2018 – September 2020 SN74AXCH1T45
PRODUCTION DATA
Figure 9-1 shows an example of the SN74AXCH1T45 being used in an application where a system controller flags an interrupt request (IRQ) to the CPU. The system controller determines the direction of the IRQ line to either flag an interrupt to the CPU or allow the CPU to drive data on the line. In this application the controller is operating at 3.3 V while the CPU can be operating as low as 0.65 V.
The SN74AXCH1T45 device is used to ensure that these devices can communicate at the appropriate voltage levels. Because the SN74AXCH1T45 does not have an output-enable ( OE) pin, the system designer should take precautions to avoid bus contention between the CPU and controller when changing directions.