FSTD162861 Datasheet | Fairchild Semiconductor

Preliminary FSTD162861 20-Bit Bus Switch with Level Shifting and 25Ω Series Resistors in Outputs (Preliminary) June 2001 Revised June 2001 FSTD162861 20-Bit Bus Switch with Level Shifting and 25Ω Series Resistors in Outputs (Preliminary) General Description The Fairchild Switch FSTD162861 provides 20-bits of highspeed CMOS TTL-patible bus switching. The low On Resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. A diode to VCC has been integrated into the circuit to allow for level shifting between 5V inputs and 3.3V outputs. The device is organized as a 10-bit or 20-bit bus switch. When OE1 is LOW, the switch is ON and Port 1A is connected to Port 1B. When OE2 is LOW, Port 2A is connected to Port 2B. When OEX is HIGH, a high impedance state exists between the A and B Ports. The FSTD162861 has equivalent 25Ω series resistors to reduce signal-reflection noise, eliminating the need for external terminating resistors. Features s 25Ω switch connection between two ports s Minimal propagation delay through the switch s Low l CC s Zero bounce in flow-through mode s Control inputs patible with TTL level s Tru Translation voltage translation from 5.0V inputs to 3.3V outputs Ordering Code: Order Number FSTD162861MTD Package Number MTD48 Package Description 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. Tru Translation is a trademark of Fairchild Semiconductor Corporation. © 2001 Fairchild Semiconductor Corporation DS500063 .fairchildsemi. Preliminary FSTD162861 Logic Diagram Connection Diagram Truth Table Inputs OE1 L L H H OE2 L H L H Inputs/Outputs 1A, 1B 1A = 1B 1A = 1B Z Z 2A, 2B 2A = 2B Z 2A = 2B Z Pin Descriptions Pin Name OE1, OE2 1A, 2A 1B, 2B Description Bus Switch Enables Bus A Bus B .fairchildsemi. Prelimina...