FSTU16245

FSTU16245 16-Bit Bus Switch with −2V Undershoot Protection April 2001 Revised April 2001 FSTU16245 16-Bit Bus Switch with −2V Undershoot Protection General Description The Fairchild Switch FSTU16245 provides 16-bits of highspeed CMOS TTL-compatible 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. The device is organized as a 16-bit switch. There are two 8-bit switches with separate output enable inputs. When OE is LOW, the switch is ON and Port a is connected to Port B. When OE is HIGH, the switch is OFF and a high impedance state exists between the A and B Ports. The A and B Ports are protected against undershoot to support an extended range to 2.0V below ground. Fairchild’s integrated Undershoot Hardened Circuit (UHC) senses undershoot at the I/O and responds by preventing voltage differentials from developing and turning the switch on. When OE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports. Features I Undershoot hardened to −2V (A and B Ports) I 4Ω switch connection between two ports. I Minimal propagation delay through the switch. I Low lCC. I Zero bounce in flow-through mode. I Control inputs compatible with TTL level. I See Application Note AN-5008 for details Ordering Code: Order Number FSTU16245MTD 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. Connection Diagram Pin Descriptions Pin Name OEn 1An, 2An, 3An, 4An 1Bn, 2Bn, 3Bn, 4Bn NC Description Output Enable Input (Active LOW) Bus A Bus B No Internal Connection UHC is a trademark of Fairchild Semiconductor Corporation. © 2001 Fairchild Semiconductor Corporation DS500432 www.fairchildsemi.com FSTU16245 Logic Diagram Truth Table Inputs OEx L H H = H IGH Voltage Level L = LOW Voltage Level Z = High Impedance Outputs A, B A Port = B Port Z www.fairchildsemi.com 2 FSTU16245 Absolute Maximum Ratings(Note 1) Supply Voltage (VCC) DC Switch Voltage (VS) (Note 2) DC Input Voltage (VIN) (Note 3) DC Input Diode Current (lIK) VIN