DESCRIPTION:

The QS3388 provides ten high-speed CMOS TTL-compatible bus switches with active terminators on the bus switch I/O pins. The low ON resistance (5?) of the 3388 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. When the switches are turned off, a low drive active terminator circuit drives the disconnected pins to VCCor ground, away from the TTL threshold. This prevents undriven buses from floating. The Bus Enable (BE) signal turns the switches on. The Bus Exchange (BX) signal provides nibble swap of the AB and CD pairs of signals. This exchange configuration allows byte swapping of buses in systems. It can also be used as a five-wide 2-to-1 multiplexer and to create low delay barrel shifters, etc.

The QS3388 is characterized for operation at -40°C to +85°C.

FEATURES:

? Enhanced N channel FET with no inherent diode to Vcc

? 5? bidirectional switches connect inputs to outputs

? Active termination drives bus pins to rails when switches are off

? Zero propagation delay, zero added ground bounce

? Undershoot clamp diodes on all switch and control inputs

? Bus exchange allows nibble swap

? TTL-compatible input and output levels

? Bus-hold eliminates floating bus lines and reduces static power consumption

? Available in QSOP package

APPLICATIONS:

? Resource sharing

? Crossbar switching

? Last value latch (graphics and DSP)