TC74HC42AF(F) Toshiba

TC74HC42AP/AF TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74HC42AP, TC74HC42AF BCD to Decimal Decoder The TC74HC42A is a high speed CMOS BCD-to-DECIMAL 2 TC74HC42AP DECODER fabricated with silicon gate C MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. A BCD code applied to the four inputs (A-D) sets a low level at one of ten decoded outputs. A illegal BCD code such as eleven thru fifteen sets all outputs high. This device can be used as 3-to-8 LINE DECODER when input D is held low. This device is useful for code conversion, address decoding, memory selection, multiplexing, or readout decoding. All inputs are equipped with protection circuits against static TC74HC42AF discharge or transient excess voltage. Features High speed: t = 13 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 Weight Balanced propagation delays: t t pLH pHL DIP16-P-300-2.54A : 1.00 g (typ.) Wide operating voltage range: V (opr) = 2 to 6 V CC SOP16-P-300-1.27A : 0.18 g (typ.) Pin and function compatible with 74LS42 Pin Assignment Start of commercial production 1987-11 1 2014-03-01 TC74HC42AP/AF IEC Logic Symbol Truth Table BCD Inputs Decimal Outputs Code No. D C B A Y 0 Y1 Y2 Y3 Y4 Y5 Y6 Y 7 Y 8 Y 9 0 L L L L L H H H H H H H H H 1 L L L H H L H H H H H H H H 2 L L H L H H L H H H H H H H 3 L L H H H H H L H H H H H H 4 L H L L H H H H L H H H H H 5 L H L H H H H H H L H H H H 6 L H H L H H H H H H L H H H 7 L H H H H H H H H H H L H H 8 H L L L H H H H H H H H L H 9 H L L H H H H H H H H H H L H X H X H H H H H H H H H H H H X X H H H H H H H H H H X: Dont care System Diagram 2 2014-03-01