54AC16646

The 54AC16646 are 16-bit bus transceivers that consist of D-type flip-flops and control circuitry, with 3-state outputs arranged for multiplexed transmission of data directly from the data bus or from the internal storage registers. The 54AC16646 can be used as two 8-bit transceivers or one 16-bit transceiver. Data on the A or B bus is clocked into the registers 54AC16646 on the low-to-high transition of the appropriate clock (CLKAB or CLKBA) input. Figure 1 illustrates the four fundamental bus-management functions that can be performed with the bus transceivers and registers.

Output-enable (OE) and direction-control (DIR) inputs of 54AC16646 are provided to control the transceiver functions. In the transceiver mode, data present at the high-impedance port may be stored in either register or in both. The select controls (SAB and SBA) can multiplex stored and real-time (transparent mode) data. The circuitry used for select control eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data. DIR of 54AC16646 determines which bus receives data when OE is active (low). In the isolation mode (OE high), A data may be stored in one register and/or B data may be stored in the other register.

When an output function of 54AC16646 is disabled, the input function is still enabled and may be used to store and transmit data. Only one of the two buses, A or B, may be driven at a time.

The 74AC16646 is packaged in the TI shrink small-outline package, which provides twice the functionality of standard small-outline packages in the same printed-circuit-board area.

The 54AC16646 is characterized for operation over the full military temperature range of 55°C to 125°C. The 74AC16646 is characterized for operation from 40°C to 85°C.