FST3244

FST3244 — 8-Bit Bus Switch March 2008 FST3244 — 8-Bit Bus Switch Features 4Ω Switch Connection between Two Ports Minimal Propagation Delay through the Switch Low ICC Zero Bounce in Flow-through Mode Control Inputs Compatible with TTL Level Description The FST3244 switch provides eight-bits of high-speed, CMOS, TTL-compatible bus switching in a standard ’244 pin-out. The low on resistance allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. The device is organized as two four-bit switches with separate /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 Information Operating Part Number Temperature Range FST3244WMX FST3244QSCX FST3244MTCX -40 to +85°C -40 to +85°C -40 to +85°C Package 20-Lead, Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300-inch Wide 20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150-inch Wide Packing Method Tape and Reel Tape and Reel 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, Tape and 4.4mm Wide Reel All packages are lead free per JEDEC: J-STD-020B standard. The Fairchild switch family derives from and embodies Fairchild’s proven switch technology used for several years in its 74LVX3L384 (FST3384) bus switch product. Logic Diagram 1A0 2 18 1B0 1A3 8 12 1B 3 /OE1 1 2A0 11 9 2B 0 2A3 17 3 2B3 /OE2 19 Figure 1. Logic Diagram © 1997 Fairchild Semiconductor Corporation FST3244 • Rev. 1.0.3 www.fairchildsemi.com FST3244 — 8-Bit Bus Switch Pin Configurations /OE1 1A0 2B3 1A1 2B2 1A2 2B1 1A3 2B0 GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC /OE2 1B0 2A3 1B1 2A2 1B2 2A1 1B3 2A0 Figure 2. Pin Configuration Pin Descriptions Pin # 1,19 2,4,6,8,11,13,15,17 3,5,7,9,12,14, 16,18 20 10 Pin Names /OE1, /OE2 1A, 2A 1B, 2B VCC GND Description Bus Switch Enables Bus A Bus B Supply Voltage Ground Truth Table Inputs /OE1 LOW LOW HIGH HIGH /OE2 LOW HIGH LOW HIGH Inputs/Outputs 1A, 1B 1A = 1B 1A = 1B High Impedance High Impedance 2A, 2B 2A = 2B High Impedance 2A = 2B High Impedance © 1997 Fairchild Semiconductor Corporation FST3244 • Rev. 1.0.3 www.fairchildsemi.com 2 FST3244 — 8-Bit Bus Switch Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VCC VS VIN IIK IOUT ICC / IGND TSTG Supply Voltage DC Switch Voltage DC Input Voltage (1) Parameter Min. -0.5 -0.5 -0.5 Max. 7.0 7.0 7.0 -50 128 ±100 Unit V V V mA mA mA °C DC Input Diode Current VIN