M74HCT244 OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED) HIGH SPEED: t = 15 ns (TYP.) at V = 4.5V PD CC LOW POWER DISSIPATION: I = 4A(MAX.) at T =25C CC A COMPATIBLE WITH TTL OUTPUTS : V = 2V (MIN.) V = 0.8V (MAX) IH IL DIP SOP TSSOP BALANCED PROPAGATION DELAYS: t t PLH PHL SYMMETRICAL OUTPUT IMPEDANCE: ORDER CODES I = I = 6mA (MIN) OH OL PACKAGE TUBE T & R PIN AND FUNCTION COMPATIBLE WITH DIP M74HCT244B1R 74 SERIES 244 SOP M74HCT244M1R M74HCT244RM13TR TSSOP M74HCT244TTR DESCRIPTION The 74HCT244 is an advanced high-speed CMOS OCTAL BUS BUFFER (3-STATE) All inputs are equipped with protection circuits 2 fabricated with silicon gate C MOS technology. against static discharge and transient excess G control input governs four BUS BUFFERs. voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS August 2001 1/9M74HCT244 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 11G Output Enable Input 2, 4, 6, 8 1A1 to 1A4 Data Inputs 9, 7, 5, 3 2Y1 to 2Y4 Data Outputs 11, 13, 15, 2A1 to 2A4 Data Inputs 17 18, 16, 14, 1Y1 to 1Y4 Data Outputs 12 19 2G Output Enable Input 10 GND Ground (0V) 20 V Positive Supply Voltage CC TRUTH TABLE INPUTS OUTPUT G An Yn LL L LH H HX Z X : Dont Care Z : High Impedance ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V Supply Voltage -0.5 to +7 V CC V DC Input Voltage -0.5 to V + 0.5 V I CC V DC Output Voltage -0.5 to V + 0.5 V O CC I DC Input Diode Current 20 mA IK I DC Output Diode Current 20 mA OK I DC Output Current 35 mA O I or I DC V or Ground Current 70 mA CC GND CC P Power Dissipation 500(*) mW D 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 (*) 500mW at 65 C derate to 300mW by 10mW/C from 65C to 85C RECOMMENDED OPERATING CONDITIONS Symbol Parameter Value Unit V Supply Voltage 4.5 to 5.5 V CC V Input Voltage 0 to V V I CC V Output Voltage 0 to V V O CC T Operating Temperature -55 to 125 C op t , t Input Rise and Fall Time (V = 4.5 to 5.5V) 0 to 500 ns r f CC 2/9