TC74HC148AF(F) Toshiba

TC74HC148AP/AF TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74HC148AP, TC74HC148AF 8-to-3 Line Priority Encoder The TC74HC148A is a high speed CMOS 8-to-3 LINE 2 TC74HC148AP ENCODER fabricated with silicon gate C MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. All data inputs and outputs of these encoders are active at the low logic level. The encoder detects a low level of the highest order among eight input signals and outputs the corresponding signal position in binaly code. Enable Input EI and Enable Output EO are used to easily cascade without using external circuits. TC74HC148AF All inputs are equipped with protection circuits against static discharge or transient excess voltage. 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 Weight Symmetrical output impedance: I = I = 4 mA (min) OH OL DIP16-P-300-2.54A : 1.00 g (typ.) Balanced propagation delays: t t pLH pHL SOP16-P-300-1.27A : 0.18 g (typ.) Wide operating voltage range: V (opr) = 2 to 6 V CC Pin and function compatible with 74LS148 Pin Assignment Start of commercial production 1988-11 1 2014-03-01 TC74HC148AP/AF IEC Logic Symbol Truth Table Inputs Outputs E1 0 1 2 3 4 5 6 7 A2 A1 A0 GS EO H X X X X X X X X H H H H H L H H H H H H H H H H H H L L X X X X X X X L L L L L H L X X X X X X L H L L H L H L X X X X X L H H L H L L H L X X X X L H H H L H H L H L X X X L H H H H H L L L H L X X L H H H H H H L H L H L X L H H H H H H H H L L H L L H H H H H H H H H H L H X: Dont care 2 2014-03-01