View m74hc138 datasheet:

M54HC138 M74HC138 3 TO 8 LINE DECODER (INVERTING) .HIGH SPEED t = 16 ns (TYP.) AT V =5V PD CC .LOW POWER DISSIPATION I =4�AAT T =25 �C CC A .OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS .BALANCED PROPAGATION DELAYS B1R F1R t =t (Plastic Package) (Ceramic Package) PLH PHL .SYMMETRICAL OUTPUT IMPEDANCE |I | =I OH OL .HIGH NOISE IMMUNITY V =V =28%V (MIN.) NIH NIL CC .WIDE OPERATING VOLTAGE RANGE M1R C1R V (OPR) = 2 V TO 6 V (Micro Package) (Chip Carrier) CC .PIN AND FUNCTION COMPATIBLE ORDER CODES : WITH 54/74LS138 M54HC138F1R M74HC138M1R M74HC138B1R M74HC138C1R DESCRIPTION The M54/74HC138 is a high speed CMOS 3 TO 8 LINE DECODER fabricated in silicon gate C2MOS PIN CONNECTIONS (top view) technology. It has the same high speed performance of LSTTL combined with t