IDT54CT16646

The IDT54CT16646 16-bit registered transceivers are built using advanced dual metal CMOS technology. These high-speed, low-power devices are organized as two inde- pendent 8-bit bus transceivers with 3-state D-type registers. The control circuitry is organized for multiplexed transmissionof data between A bus and B bus either directly or from the internal storage registers. Each 8-bit transceiver/register fea- tures direction control (xDIR), over-riding Output Enable con- trol (xOE ) and Select lines (xSAB and xSBA) to select either real-time data or stored data. Separate clock inputs are provided for A and B port registers. Data on the A or B data bus, or both, can be stored in the internal registers by the LOW-to-HIGH transitions at the appropriate clock pins. Flow- through organization of signal pins simplifies layout. All inputs are designed with hysteresis for improved noise margin. The IDT54/74FCT16646T/AT/CT/ET are ideally suited for driving high-capacitance loads and low-impedance backplanes. The output buffers are designed with power offdisable capability to allow "live insertion" of boards when used as backplane drivers.
The IDT54CT16646 have balanced output drive with current limiting resistors. This offers low ground bounce, minimal undershoot, and controlled output fall timesreducing the need for external series terminating resistors. The IDT54/74FCT162646T/AT/CT/ET are plug-in replacements for the IDT54/74FCT16646T/AT/CT/ET and IDT54CT16646 for on-board bus interface applications.