General Description

The VS3257 is a high-speed TTL–compatible Quad 2:1 multiplexer/demultiplexer. The VS3257 contains four mux/demux channels, with a common path control (S) and active low enable (/E). The low ON resistance of the VS3257 allows inputs to be connected to outputs, without adding propagation delay and without generating additional signal noise. The VS32257 has 25? resistors in series with the switches to reduce ground-bounce noise and signal reflection.

特性 Features

? Enhanced N-FET with no DC path to VCC

or GND in normal operating signal voltage

range.

? Low impedance bidirectional data flow:

5? (VS3257) and 25? (VS32257)

? Pin-compatible with QS3257 and CBT3257

switches.

? Near zero propagation delay

? Zero added ground bounce or signal noise

? Break-before-make feature

? TTL-compatible control signals

? Undershoot clamp diodes on all switch and

control pins

? ESD rating >2000V (Human Body Model)

or >200V (Machine Model)

? Latch-up current >100mA

? Available in 150-mil wide QSOP package

Applications

? 5V to 3.3V translation in mixed-supply

environment

? Hot-swap interface

? Logic replacement

? Memory bank, video, & audio

swtiching

? Power conservation