74LCX245 LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER (3-STATE) WITH 5V TOLERANT INPUTS AND OUTPUTS 5V TOLERANT INPUTS AND OUTPUTS HIGH SPEED: t = 7.0 ns (MAX.) at V = 3V PD CC POWER DOWN PROTECTION ON INPUTS AND OUTPUTS SYMMETRICAL OUTPUT IMPEDANCE: SOP TSSOP I = I = 24mA (MIN) at V = 3V OH OL CC PCI BUS LEVELS GUARANTEED AT 24 mA BALANCED PROPAGATION DELAYS: Table 1: Order Codes t t PLH PHL OPERATING VOLTAGE RANGE: PACKAGE T & R V (OPR) = 2.0V to 3.6V (1.5V Data CC SOP 74LCX245MTR Retention) TSSOP 74LCX245TTR PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 245 LATCH-UP PERFORMANCE EXCEEDS It has same speed performance at 3.3V than 5V 500mA (JESD 17) AC/ACT family, combined with a lower power consumption. ESD PERFORMANCE: This IC is intended for two way asynchronous HBM > 2000V (MIL STD 883 method 3015) communication between data buses the direction MM > 200V of data transmission is determined by DIR input. The enable input G can be used to disable the DESCRIPTION device so that the buses are effectively isolated. The 74LCX245 is a low voltage CMOS OCTAL All inputs and outputs are equipped with BUS TRANSCEIVER (3-STATE) fabricated with protection circuits against static discharge, giving sub-micron silicon gate and double-layer metal 2 them 2KV ESD immunity and transient excess wiring C MOS technology. It is ideal for low power voltage. and high speed 3.3V applications it can be All floating bus terminals during High Z state must interfaced to 5V signal environment for both inputs be held HIGH or LOW. and outputs. Figure 1: Pin Connection And IEC Logic Symbols Rev. 4 September 2004 1/1374LCX245 Figure 2: Input And Output Equivalent Circuit Table 2: Pin Description PIN N SYMBOL NAME AND FUNCTION 1 DIR Directional Control 2, 3, 4, 5, 6, 7, 8, 9 A1 to A8 Data Inputs/Outputs 18, 17, 16, 15, 14, 13, 12, 11 B1 to B8 Data Inputs/Outputs 19 G Output Enable Input 10 GND Ground (0V) 20 V Positive Supply Voltage CC Table 3: Truth Table INPUTS FUNCTION OUTPUT G DIR A BUS B BUS L L OUTPUT INPUT A = B L H INPUT OUTPUT B = A H X ZZZ X : Dont Care Z : High Impedance 2/13