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SN74LVTH18511,pdf(3.3-V ABT 18
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The SN74LVTH18511 is an 18-bit universal bus transceiver with boundary scan. This device supports IEEE Std 1149.1-1990 boundary scan to facilitate testing of complex circuit-board assemblies. Scan access to the test circuitry is accomplished via the 4-wire test access port (TAP) interface.
Additionally, this device is designed specifically for low-voltage (3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment.
In the normal mode, this device is an 18-bit UBT that combines D-type latches and D-type flip-flops to allow data flow in transparent, latched, or clocked modes. It can be used either as two 9-bit transceivers or one 18-bit transceiver. Activating the TAP in the normal mode does not affect the functional operation of the UBT.
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