IDT74FST1632383

  The FST163383/1632383 belong to IDT's family of Bus switches.  Bus switch devices perform the function of connecting or isolating two ports without providing any inherent current sink or source capability.  Thus they generate little or no noise of their own while providing a low resistance path for an external driver.  These devices connect input and output ports through an n-channel FET.  When the gate-to-source junction of this FET is adequately forward-biased the device conducts and the resistance between input and output ports is small.  Without adequate bias on the gate-to-source junction of the FET, the FET is turned off, therefore with no V_CC applied, the device has hot insertion capability.

    The low on-resistance and simplicity of the connection between input and output ports reduces the delay in this path to close to zero.

    The FST1632xxx integrates terminating resistors in the device, thus eliminating the need for external 25Ω series resistors.

    The FST163383 and FST1632383 each provide four 4-bit TTL- compatible ports that support 2 way bus exchange.  The BX pin controls the bus exchange and the BE pin serves as the enable pin.