FSTU3125 ,4-Bit Bus Switch with .2V Undershoot ProtectionFeaturesThe Fairchild Switch FSTU3125 provides four high-speed
FSTU3125
4-Bit Bus Switch with .2V Undershoot Protection
FSTU3125 4-Bit Bus Switch with −2V Undershoot Protection June 2001 Revised August 2001 FSTU3125 4-Bit Bus Switch with −2V Undershoot Protection General Description Features The Fairchild Switch FSTU3125 provides four high-speedUndershoot hardened to −2V (A and B Ports) CMOS TTL-compatible bus switches. The low On Resis-4Ω switch connection between two ports tance of the switch allows inputs to be connected to out- Minimal propagation delay through the switch puts without adding propagation delay or generating Low l CC additional ground bounce noise. The A and B Ports are protected against undershoot to support an extendedZero bounce in flow-through mode range to 2.0V below ground. Fairchild’s integrated Under- Control inputs compatible with TTL level shoot Hardened Circuit (UHC) senses undershoot at the See application notes AN-5008 and AN-5021 for details I/O and responds by preventing voltage differentials from on undershoot developing and turning the switch on. The device is organized as four 1-bit switches with sepa- rate OE inputs. When OE is LOW, the switch is ON and Port A is connected to Port B. When OE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports. Ordering Code: Order Number Package Number Package Description FSTU3125M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow FSTU3125QSC MQA16 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide FSTU3125MTC MTC14 14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagrams Pin Descriptions Pin Name Description Pin Assignment for SOIC and TSSOP OE , OE , OE , OE Bus Switch Enables 1 2 3 4 1A, 2A, 3A, 4A Bus A 1B, 2B, 3B, 4B Bus B NC Not Connected Truth Table Inputs Inputs/Outputs OE A,B LA = B Pin Assignment for QSOP HZ © 2001 DS500449
