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This literature is subject to all applicable copyright laws and is not for resale in any manner.FSTD16861 20-Bit Bus Switch with Level Shifting May 2001 Revised June 2005 FSTD16861 20-Bit Bus Switch with Level Shifting General Description Features The Fairchild Switch FSTD16861 provides 20-bits of high- 4: switch connection between two ports. speed CMOS TTL-compatible bus switching. The low On Minimal 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. A diode to V has been CC Control inputs compatible with TTL level. integrated into the circuit to allow for level shifting between 5V inputs and 3.3V outputs. TruTranslation voltage translation from 5.0V inputs to 3.3V outputs 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 Power-off high impedance inputs and outputs nected to Port 1B. When OE is LOW, Port 2A is connected 2 Supports live insertion/withdrawal (Note 1) to Port 2B. When OE is HIGH, a high impedance state X Note 1: To ensure the high-impedance state during power up or power down, OE should be tied to V through a pull-up resistor the minimum exists between the A and B Ports. CC value of the resistor is determined by the current-sourcing capability of the driver. Ordering Code: Order Number Package Number Package Description FSTD16861MTD 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. TruTranslation is trademark of Fairchild Semiconductor Corporation. 2005 Fairchild Semiconductor Corporation DS500421 www.fairchildsemi.com