FST3257MTC

FST3257 Quad 2:1 Multiplexer/Demultiplexer Bus Switch September 1997 Revised December 1999 FST3257 Quad 2:1 Multiplexer/Demultiplexer Bus Switch General Description The Fairchild Switch FST3257 is a quad 2:1 high-speed CMOS TTL-compatible multiplexer/demultiplexer bus switch. The low on resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. When OE is LOW, the select pin connects the A Port to the selected B Port output. When OE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports. Features s 4Ω switch connection between two ports. s Minimal propagation delay through the switch. s Low lCC. s Zero bounce in flow-through mode. s Control inputs compatible with TTL level. Ordering Code: Order Number FST3257M FST3257QSC FST3257MTC Package Number M16A MQA16 MTC16 Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide 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 Pin Descriptions Pin Name OE S A B1–B2 Description Bus Switch Enable Select Input Bus A Bus B Truth Table S X L H OE H L L Function Disconnect A = B1 A = B2 © 1999 Fairchild Semiconductor Corporation DS500057 www.fairchildsemi.com FST3257 Absolute Maximum Ratings(Note 1) Supply Voltage (VCC ) DC Switch Voltage (VS) DC Input Voltage (VIN)(Note 2) DC Input Diode Current (lIK) VIN