SN74ALVC16269

The SN74ALVC16269 is a 12-bit to 24-bit registered bus transceiver, which is intended for applications where two separate ports must be multiplexed onto, or demultiplexed from, a single port. The device is particularly suitable as an interface between synchronous DRAMs and high-speed microprocessors. The SN74ALVC16269 is designed specifically for low-voltage (3.3-V) V_CC operation; it is tested at 2.5-V, 2.7-V, and 3.3-V V_CC.

Data is stored in the internal B-port registers on the low-to-high transition of the clock (CLK) input when the appropriate clock-enable (CLKENA) inputs are low. Proper control of these inputs allows two sequential 12-bit words to be presented as a 24-bit word on the B port. For data transfer in the B-to-A direction, a single storage register is provided. The select (SEL) line selects 1B or 2B data for the A outputs. The register on the A output permits the fastest possible data transfer, thus extending the period that the data is valid on the bus. The control terminals are registered so that all transactions are synchronous with CLK. Data flow is controlled by the active-low output enables (OEA, OEB1, OEB2).Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.The SN74ALVC16269 is available in TI's shrink small-outline (DL) and thin shrink small-outline (DGG) packages, which provide twice the I/O pin count and functionality of standard small-outline packages in the same printed-circuit-board area.

The SN74ALVC16269 is characterized for operation from 40°C to 85°C.