FST162861 ,20-Bit Bus Switch with 25-Ohm Series Resistors in OutputsFeaturesThe Fairchild Switch FST162861 provides 20-Bits of high-
FST162861
20-Bit Bus Switch with 25-Ohm Series Resistors in Outputs
FST162861 20-Bit Bus Switch with 25Ω Series Resistors in Outputs March 2000 Revised July 2000 FST162861 20-Bit Bus Switch with 25Ω Series Resistors in Outputs General Description Features The Fairchild Switch FST162861 provides 20-Bits of high-25Ω switch connection between two ports. speed CMOS TTL-compatible bus switching. The low onMinimal propagation delay through the switch. resistance of the switch allows inputs to be connected to Low l . CC outputs without adding propagation delay or generating Zero bounce in flow-through mode. additional ground bounce noise. Control inputs compatible with TTL level. The device is organized as a 10-bit or 20-Bit bus switch. When OE is LOW, the switch is ON and Port 1A is con- 1 nected to Port 1B. When OE is LOW, Port 2A is connected 2 to Port 2B. When OE is HIGH, a high impedance state X exists between the A and B ports. The FST162861 has an equivalent 25Ω series resistors to reduce signal-reflection noise, eliminating the need for external terminating resis- tors. Ordering Code: Order Number Package Number Package Description FST162861MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Diagram Connection Diagram Truth Table Inputs Inputs/Outputs Pin Descriptions OE OE 1A, 1B 2A, 2B 1 2 Pin Name Description LL 1A = 1B 2A = 2B LH 1A = 1B Z OE , OE Bus Switch Enables 1 2 HL Z 2A = 2B 1A, 2A Bus A HH Z Z 1B, 2B Bus B © 2000 DS500319
