74LVX4245 8-Bit Dual Supply Translating Transceiver with 3-STATE Outputs January 1993 Revised September 2003 74LVX4245 8-Bit Dual Supply Translating Transceiver with 3-STATE Outputs General Description Features The LVX4245 is a dual-supply, 8-bit translating transceiver Bidirectional interface between 5V and 3V buses that is designed to interface between a 5V bus and a 3V Control inputs compatible with TTL level bus in a mixed 3V/5V supply environment. The Transmit/ 5V data flow at A Port and 3V data flow at B Port Receive (T/R) input determines the direction of data flow. Outputs source/sink 24 mA at 5V bus 12 mA at 3V bus Transmit (active-HIGH) enables data from A Ports to B Ports Receive (active-LOW) enables data from B Ports to Guaranteed simultaneous switching noise level and dynamic threshold performance A Ports. The Output Enable input, when HIGH, disables both A and B Ports by placing them in a high impedance Implements patented EMI reduction circuitry condition. The A Port interfaces with the 5V bus the B Port Functionally compatible with the 74 series 245 interfaces with the 3V bus. The LVX4245 is suitable for mixed voltage applications such as laptop computers using 3.3V CPUs and 5V LCD displays. Ordering Code: Order Number Package Number Package Description 74LVX4245WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 74LVX4245QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide 74LVX4245MTC MTC24 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Devices also available in Tape and Reel. Specify by appending the suffix letter X to the ordering code. Logic Symbol Pin Descriptions Pin Names Description OE Output Enable Input T/R Transmit/Receive Input A A Side A Inputs or 3-STATE Outputs 0 7 B B Side B Inputs or 3-STATE Outputs 0 7 Connection Diagram Truth Table Inputs Outputs OE T/R L L Bus B Data to Bus A L H Bus A Data to Bus B H X HIGH-Z State H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial 2003 Fairchild Semiconductor Corporation DS011540 www.fairchildsemi.comLogic Diagram www.fairchildsemi.com 2 74LVX4245