PAL14L4                                         PAL DESIGN SPECIFICATION
P7074                                              VINCENT COLI 01/05/82
QUAD 3:1 MULTIPLEXER
MMI SUNNYVALE, CALIFORNIA
1C0 1C1 1C2 2C0 2C1 2C2 3C0 3C1 3C2 GND
4C0 4C1 4C2  4Y  3Y  2Y  1Y  B   A  VCC

 
/1Y  =  /B*/A * /1C0                            ;SELECT INPUT 1C0
     +  /B* A * /1C1                            ;SELECT INPUT 1C1
     +   B*/A * /1C2                            ;SELECT INPUT 1C2
 
/2Y  =  /B*/A * /2C0                            ;SELECT INPUT 2C0
     +  /B* A * /2C1                            ;SELECT INPUT 2C1
     +   B*/A * /2C2                            ;SELECT INPUT 2C2
 
/3Y  =  /B*/A * /3C0                            ;SELECT INPUT 3C0
     +  /B* A * /3C1                            ;SELECT INPUT 3C1
     +   B*/A * /3C2                            ;SELECT INPUT 3C2
 
/4Y  =  /B*/A * /4C0                            ;SELECT INPUT 4C0
     +  /B* A * /4C1                            ;SELECT INPUT 4C1
     +   B*/A * /4C2                            ;SELECT INPUT 4C2


FUNCTION TABLE
 
B A 1C0 1C1 1C2 2C0 2C1 2C2 3C0 3C1 3C2 4C0 4C1 4C2 1Y 2Y 3Y 4Y
 
; SEL  ------INPUTS------  --OUTPUTS--      COMMENTS
;       1C   2C   3C   4C
; B A  012  012  012  012  1Y 2Y 3Y 4Y
--------------------------------------------------------
  L L  LHH  HHH  HHH  HHH   L  H  H  H      1C0=0
  L L  HHH  LHH  HHH  HHH   H  L  H  H      2C0=0
  L L  HHH  HHH  LHH  HHH   H  H  L  H      3C0=0
  L L  HHH  HHH  HHH  LHH   H  H  H  L      4C0=0
  L L  HLL  LLL  LLL  LLL   H  L  L  L      1C0=1
  L L  LLL  HLL  LLL  LLL   L  H  L  L      2C0=1
  L L  LLL  LLL  HLL  LLL   L  L  H  L      3C0=1
  L L  LLL  LLL  LLL  HLL   L  L  L  H      4C0=1
  L L  HHH  HHH  HHH  HHH   H  H  H  H      TOGGLE LINES
  L H  HLH  HHH  HHH  HHH   L  H  H  H      1C1=0
  L H  HHH  HLH  HHH  HHH   H  L  H  H      2C1=0
  L H  HHH  HHH  HLH  HHH   H  H  L  H      3C1=0
  L H  HHH  HHH  HHH  HLH   H  H  H  L      4C1=0
  L H  LHL  LLL  LLL  LLL   H  L  L  L      1C1=1
  L H  LLL  LHL  LLL  LLL   L  H  L  L      2C1=1
  L H  LLL  LLL  LHL  LLL   L  L  H  L      3C1=1
  L H  LLL  LLL  LLL  LHL   L  L  L  H      4C1=1
  L H  HHH  HHH  HHH  HHH   H  H  H  H      TOGGLE LINES
  H L  HHL  HHH  HHH  HHH   L  H  H  H      1C2=0
  H L  HHH  HHL  HHH  HHH   H  L  H  H      2C2=0
  H L  HHH  HHH  HHL  HHH   H  H  L  H      3C2=0
  H L  HHH  HHH  HHH  HHL   H  H  H  L      4C2=0
  H L  LLH  LLL  LLL  LLL   H  L  L  L      1C2=1
  H L  LLL  LLH  LLL  LLL   L  H  L  L      2C2=1
  H L  LLL  LLL  LLH  LLL   L  L  H  L      3C2=1
  H L  LLL  LLL  LLL  LLH   L  L  L  H      4C2=1
  H L  HHH  HHH  HHH  HHH   H  H  H  H      TOGGLE LINES
  H H  LLL  LLL  LLL  LLL   H  H  H  H      SELECT = 4
  H H  HHH  HHH  HHH  HHH   H  H  H  H      TOGGLE LINES
 -------------------------------------------------------

 
DESCRIPTION
 
THIS IS AN EXAMPLE OF A QUAD 3-TO-1 MULTIPLEXER USING A PAL18L4.  SELECT
LINES A,B ARE ENCODED IN BINARY, WITH A REPRESENTING THE LSB.  THE OUTPUTS
(Y) ARE ALL HIGH IF THE SELECT LINES ARE BOTH HIGH (B,A=H).

      OPERATIONS TABLE:

      INPUT    OUTPUTS
      SELECT
       B  A      Y
      ----------------
       L  L      C0
       L  H      C1
       H  L      C2
       H  H      H
      ----------------