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ic 74154
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4:16 DECODER (IC 74154) :

 

PIN DIAGRAM:

 

 

 

 

DESCRIPTION:

 

  HIGH SPEED

  tPD = 15 ns (TYP.) at VCC = 5 V LOWPOWER DISSIPATION

  ICC = 4 A (MAX.) at TA = 25 C HIGH NOISE IMMUNITY

  VNIH = VNIL = 28 % VCC (MIN.) OUTPUT DRIVE CAPABILITY

  15 LSTTL LOADS SYMMETRICAL OUTPUT IMPEDANCE

  IOH= IOL = 4 mA (MIN.) BALANCEDPROPAGATION DELAYS

  tPLH = tPHL WIDE OPERATING VOLTAGE RANGE

  VCC (OPR) = 2 V to 6 V PIN AND FUNCTION COMPATIBLE

WITH 54/74LS154.

 

A decoder is a device which does the reverse operation of an encoder, undoing the encoding so that the original information can be retrieved. The same method used to encode is usually just reversed in order to decode. It is a combinational circuit that converts binary information from n input lines to a maximum of 2n unique output lines.

In digital electronics, a decoder can take the form of a multiple-input, multiple-output logic circuit that converts coded inputs into coded outputs, where the input and output codes are different. e.g. n-to-2n, binary-coded decimal decoders. Enable inputs must be on for the decoder to function, otherwise its outputs assume a single "disabled" output code word. Decoding is necessary in applications such as data multiplexing, 7 segment display and memory address decoding.

Most kinds of random-access memory use a n-to-2n decoder to convert the selected address on the address bus to one of the row address select lines. A decoder is a device which does the reverse of an encoder, undoing the encoding so that the original information can be retrieved. The same method used to encode is usually just reversed in order to decode.