FST32253 ,Dual 4:1 Multiplexer/Demultiplexer Bus Switch with 25-Ohm Series Resistor in OutputsFeaturesThe Fairchild Switch FST32253 is a dual 4:1 high-speed
FST32253
Dual 4:1 Multiplexer/Demultiplexer Bus Switch with 25-Ohm Series Resistor in Outputs
FST32253 Dual 4:1 Multiplexer/Demultiplexer Bus Switch with 25Ω Series Resistor in Outputs August 2001 Revised September 2001 FST32253 Dual 4:1 Multiplexer/Demultiplexer Bus Switch with 25Ω Series Resistor in Outputs General Description Features The Fairchild Switch FST32253 is a dual 4:1 high-speed25Ω switch connection between two ports CMOS TTL-compatible multiplexer/demultiplexer busMinimal propagation delay through the switch switch. The low On Resistance of the switch allows inputs Low l CC to be connected to outputs without adding propagation Zero bounce in flow-through mode delay or generating additional ground bounce noise. Control inputs compatible with TTL level When OE is LOW, S and S connect the A Port to the 0 1 selected B Port output. When OE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports. The FST32253 has an equivalent 25Ω series resistor to reduce signal-reflection noise, eliminating the need for external terminating resistors. Ordering Code: Order Number Package Number Package Description FST32253M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow FST32253QSC MQA16 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide FST32253MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code. Logic Diagram Connection Diagram Truth Table S S OE OE Function 1 0 1 2 Pin Descriptions X X H X Disconnect 1A X X X H Disconnect 2A Pin Name Description L LLL A = B 1 OE , OE Bus Switch Enables 1 2 LH L L A = B 2 S , S Select Inputs 0 1 H LLL A = B 3 ABus A HH L L A = B 4 B , B , B , B Bus B 1 2 3 4 © 2001 DS500472
