TC74HC540,541AP/AF TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74HC540AP,TC74HC540AF,TC74HC541AP,TC74HC541AF Octal Bus Buffer TC74HC540AP/AF Inverting, 3-State Outputs TC74HC541AP/AF Non-Inverting, 3-State Outputs TC74HC540AP, TC74HC541AP The TC74HC540A/TC74HC541A are high speed CMOS OCTAL 2 BUS BUFFERs fabricated with silicon gate C MOS technology. They achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. The TC74HC540A is an inverting type, and the TC74HC541A is a non-inverting type. When either G1 or G2 are high, the terminal outputs are in TC74HC540AF, TC74HC541AF the high-impedance state. All inputs are equipped with protection circuits against static discharge or transient excess voltage. Features High speed: t = 10 ns (typ.) at V = 5 V pd CC Low power dissipation: I = 4 A (max) at Ta = 25C CC High noise immunity: V = V = 28% V (min) NIH NIL CC Output Drive Capability: 15 LSTTL loads Weight DIP20-P-300-2.54A : 1.30 g (typ.) Symmetrical output impedance: I = I = 6 mA (min) OH OL SOP20-P-300-1.27A : 0.22 g (typ.) Balanced propagation delays: t t pLH pHL Wide operating voltage range: V (opr) = 2 to 6 V CC Pin and function compatible with 74LS540/541 1 2007-10-01 TC74HC540,541AP/AF Pin Assignment TC74HC540A TC74HC541A IEC Logic Symbol TC74HC540A TC74HC541A Truth Table Inputs Outputs G 1 G A2 n Yn* Yn* H X X Z Z X H X Z Z L L H H L L L L L H X: Dont care Z: High impedance *: Yn............. HC541 Yn ............ HC540 2 2007-10-01