M74HCT540 OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (INVERTED) HIGH SPEED: t = 12ns (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: I = I = 6mA (MIN) OH OL ORDER CODES PIN AND FUNCTION COMPATIBLE WITH PACKAGE TUBE T & R 74 SERIES 540 DIP M74HCT540B1R SOP M74HCT540M1R M74HCT540RM13TR DESCRIPTION TSSOP M74HCT540TTR The 74HCT540 is an advanced high-speed CMOS OCTAL BUS BUFFER (3-STATE) 2 fabricated with silicon gate C MOS technology. The M74HCT540 is designed to directly interface 2 The M74HCT540 is an inverting buffer. HSCMOS systems with TTL and NMOS The 3-STATE control gate operates as a two input components. AND such that if either G1 and G2 are high, all All inputs are equipped with protection circuits eight output are in the high impedance state. In against static discharge and transient excess order to enhance PC board layout the voltage. M74HCT540 offer a pinout having inputs and outputs on opposite sides of the package. PIN CONNECTION AND IEC LOGIC SYMBOLS August 2001 1/9 Obsolete Product(s) - Obsolete Product(s)M74HCT541 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 1, 19 G1, G2 Output Enable Inputs 2, 3, 4, 5, 6, A1 to A8 Data Inputs 7, 8, 9 18, 17, 16, Y1 to Y8 Bus Outputs 15, 14, 13, 12, 11 10 GND Ground (0V) 20 V Positive Supply Voltage CC TRUTH TABLE INPUT OUTPUT G1 G2 An Yn HXXZ XHXZ LLHL LLLH X : Dont Care Z : High Impedance ABSOLUTE MAXIMUM RATINGS Symbol Parameter ValueUnit 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 Obsolete Product(s) - Obsolete Product(s)