74VHCT541A OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED) HIGH SPEED: t = 4.1 ns (TYP.) at V = 5V PD CC LOW POWER DISSIPATION: I = 4 A (MAX.) at T =25C CC A COMPATIBLE WITH TTL OUTPUTS: V = 2V (MIN.), V = 0.8V (MAX) IH IL POWER DOWN PROTECTION ON INPUTS SOP TSSOP & OUTPUTS SYMMETRICAL OUTPUT IMPEDANCE: I = I = 8 mA (MIN) Table 1: Order Codes OH OL BALANCED PROPAGATION DELAYS: PACKAGE T & R t t PLH PHL OPERATING VOLTAGE RANGE: SOP 74VHCT541AMTR V (OPR) = 4.5V to 5.5V CC TSSOP 74VHCT541ATTR PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 541 In order to enhance PC board layout, the IMPROVED LATCH-UP IMMUNITY 74VHCT541 offers a pinout having inputs and LOW NOISE: V = 0.9V (MAX.) OLP outputs on opposite sides of the package. Power down protection is provided on all inputs DESCRIPTION and outputs and 0 to 7V can be accepted on The 74VHCT541A is an advanced high-speed inputs with no regard to the supply voltage. This CMOS OCTAL BUS BUFFER (3-STATE) device can be used to interface 5V to 3V since all fabricated with sub-micron silicon gate and inputs are equipped with TTL threshold. 2 double-layer metal wiring C MOS technology. All inputs and outputs are equipped with The 3 STATE control gate operates as two input protection circuits against static discharge, giving AND such that if either G1 and G2 are high, all them 2KV ESD immunity and transient excess eight outputs are in the high impedance state. voltage. Figure 1: Pin Connection And IEC Logic Symbols Rev. 4 December 2004 1/1274VHCT541A Figure 2: Input Equivalent Circuit Table 2: Pin Description PIN N 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 Data Outputs 15, 14, 13, 12, 11 10 GND Ground (0V) 20 V Positive Supply Voltage CC Table 3: Truth Table INPUT OUTPUT G1 G2 An Yn HX X Z XHX Z LL H H LLLL X : Dont Care Z : High impedance 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 (see note 1) -0.5 to +7.0 V O V DC Output Voltage (see note 2) -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 25 mA O I or I DC V or Ground Current 50 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) Output in OFF State 2) High or Low State 2/12