TC74HC251AP(F) Toshiba

TC74HC251AP/AF TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74HC251AP, TC74HC251AF 8-Channel Multiplexer (3-state) The TC74HC251A is a high speed CMOS 8-CHANNEL 2 TC74HC251AP MULTIPLEXER fabricated with silicon gate C MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. One of eight date input signals (D0-D7) is selected by decoding of the address input (A, B, C). The selected data appears on two outputs non-inverting (Y) and inverting (W). When the strobe input is held high, both outputs are in the high-impedance state. All inputs are equipped with protection circuits against static discharge or transient excess voltage. TC74HC251AF Features High speed: t = 15 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: 10 LSTTL loads Symmetrical output impedance: I = I = 4 mA (min) OH OL Balanced propagation delays: t t pLH pHL Wide operating voltage range: V (opr) = 2 to 6 V CC Weight Pin and function compatible with 74LS251 DIP16-P-300-2.54A : 1.00 g (typ.) SOP16-P-300-1.27A : 0.18 g (typ.) Pin Assignment Start of commercial production 1987-11 1 2014-03-01 TC74HC251AP/AF IEC Logic Symbol Truth Table Inputs Outputs Select Strobe Y W C B A ST X X X H Z Z L L L L D0 D 0 L L H L D1 D 1 L H L L D2 D 2 L H H L D3 D 3 H L L L D4 D 4 H L H L D5 D 5 H H L L D6 D 6 H H H L D7 D 7 X: Dont care H: High impedance 2 2014-03-01