M74HCT245 OCTAL BUS TRANSCEIVER WITH 3 STATE OUTPUTS (NON INVERTED) HIGH SPEED: t = 13ns (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 SYMMETRICAL OUTPUT IMPEDANCE: I = I = 6mA (MIN) OH OL BALANCED PROPAGATION DELAYS: t t PLH PHL ORDER CODES PIN AND FUNCTION COMPATIBLE WITH PACKAGE TUBE T & R 74 SERIES 245 DIP M74HCT245B1R SOP M74HCT245M1R M74HCT245RM13TR DESCRIPTION TSSOP M74HCT245TTR The M74HCT245 is an advanced high-speed CMOS OCTAL BUS TRANSCEIVER (3-STATE) 2 fabricated with silicon gate C MOS technology. All inputs are equipped with protection circuits This IC is intended for two-way asynchronous against static discharge and transient excess communication between data buses, and the voltage. direction of data transmission is determined by All floating bus terminals during High Z State must DIR input. The enable input G can be used to be held HIGH or LOW. disable the device so that the buses are effectively isolated. PIN CONNECTION AND IEC LOGIC SYMBOLS August 2001 1/9M74HCT245 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 1 DIR Directional Control 2, 3, 4, 5, 6, A1 to A8 Data Inputs/Outputs 7, 8, 9 18, 17, 16, B1 to B8 Data Inputs/Outputs 15, 14, 13, 12, 11 19 G Output Enable Input 10 GND Ground (0V) 20 V Positive Supply Voltage CC TRUTH TABLE INPUTS FUNCTION OUTPUT G DIR A BUS B BUS Yn L L OUTPUT INPUT A = B L H INPUT OUTPUT B = A HX Z Z 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