74LVC244A LOW VOLTAGE CMOS QUAD BUS BUFFERS (3-STATE) HIGH PERFORMANCE 5V TOLERANT INPUTS HIGH SPEED: t = 5.9ns (MAX.) at V = 3V PD CC POWER DOWN PROTECTION ON INPUTS AND OUTPUTS SYMMETRICAL OUTPUT IMPEDANCE: I = I = 24mA (MIN) at V = 3V OH OL CC SOP TSSOP PCI BUS LEVELS GUARANTEED AT 24 mA BALANCED PROPAGATION DELAYS: t t PLH PHL Table 1: Order Codes OPERATING VOLTAGE RANGE: V (OPR) = 1.65V to 3.6V (1.2V Data PACKAGE T & R CC Retention) SOP 74LVC244AMTR PIN AND FUNCTION COMPATIBLE WITH TSSOP 74LVC244ATTR 74 SERIES 244 LATCH-UP PERFORMANCE EXCEEDS It can be interfaced to 5V signal environment for 500mA (JESD 17) inputs in mixed 3.3/5V system. ESD PERFORMANCE: G control output governs four BUS BUFFERs. HBM > 2000V (MIL STD 883 method 3015) This device is designed to be used with 3 state MM > 200V memory address drivers, etc. It has more speed performance at 3.3V than 5V DESCRIPTION AC/ACT family, combined with a lower power The 74LVC244A is a low voltage CMOS OCTAL consumption. BUS BUFFER (3-STATE) fabricated with All inputs and outputs are equipped with sub-micron silicon gate and double-layer metal protection circuits against static discharge, giving 2 wiring C MOS technology. It is ideal for 1.65 to 3.6 them 2KV ESD immunity and transient excess V operations and low power and low noise CC voltage. applications. Figure 1: Pin Connection And IEC Logic Symbols Rev. 5 July 2004 1/12 .74LVC244A Figure 2: Input And Output Equivalent Circuit Table 2: Pin Description Table 3: Truth Table PIN N SYMBOL NAME AND FUNCTION INPUTS OUTPUT 11G Output Enable Input G An Yn 2, 4, 6, 8 1A1 to 1A4 Data Inputs LLL 9, 7, 5, 3 2Y1 to 2Y4 Data Outputs LH H 11, 13, 15, 2A1 to 2A4 Data Inputs HX Z 17 18, 16, 14, 1Y1 to 1Y4 Data Outputs X : Dont care 12 Z : High Impedance 19 2G Output Enable Input 10 GND Ground (0V) 20 V Positive Supply Voltage CC Table 4: Absolute Maximum Ratings Symbol Parameter Value Unit V Supply Voltage -0.5 to +7.0 V CC V DC Input Voltage -0.5 to +7.0 V I V DC Output Voltage (High Impedance or V = 0V) -0.5 to +7.0 V O CC V DC Output Voltage (High or Low State) (note 1) -0.5 to V + 0.5 V O CC I DC Input Diode Current - 50 mA IK I DC Output Diode Current (note 2) - 50 mA OK I DC Output Current 50 mA O I or I DC V or Ground Current per Supply Pin 100 mA CC GND CC T Storage Temperature -65 to +150 C stg T Lead Temperature (10 sec) 300 C L Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied 1) I absolute maximum rating must be observed O 2) V < GND O 2/12