For example:  15434B + 15433B + 15435A cascaded together
            (1000 ps) (500 ps) (150 ps)
     
              = SQRT [(1000)^2 + (500)^2 + (150)^2] 
              = 1128 ps
              = 1.128 ns
     
CODE WITH AVAILABLE MODEL NUMBERS AND TRANSITION TIME VALUES:
     
                 CODE   MODEL #       VALUE
                 A =    15435A    =    150 ps
                 B =    15432B    =    250 ps
                 C =    15433B    =    500 ps
                 D =    15434B    =   1000 ps
                 E =    15438A    =   2000 ps
     
TABLE OF RESULTING CASCADED TRANSITION TIME VALUES:
(Combinations of 1 or 2 or 3 cascaded together.  For other values cascade
 4 or more and calculate the square root of the sum of the squares.)
     
    VALUE (ps)       CASCADED TTCs
       150           A
       212           A + A
     
       250           B
       260           A + A + A
       292           A + B
       328           A + A + B
       354           B + B
       384           A + B + B
       433           B + B + B
     
       500           C
       522           A + C
       543           A + A + C
       559           B + C
       579           A + B + C
       612           B + B + C
       707           C + C
       723           A + C + C
       750           B + C + C
       886           C + C + C
     
      1000           D
      1011           A + D
      1022           A + A + D
     
      1061           B + B + D
      1118           C + D                                                      
      1129           A + C + D                                                  
      1146           B + C + D
      1225           C + C + D
      1414           D + D                                           
      1422           A + D + D                                                   
      1436           B + D + D
      1500           C + D + D
      1732           D + D + D
     
      2000           E
      2006           A + E
      2011           A + A + E
      2016           B + E                                            
      2031           B + B + E                                                  
      2062           C + E
      2121           C + C + E
      2236           D + E
      2241           A + D + E                                                    
      2250           B + D + E                                                
      2291           C + D + E
      2449           D + D + E
      2828           E + E                                             
      2832           A + E + E                                                   
      2839           B + E + E
      2872           C + E + E
     
      3000           D + E + E
      3464           E + E + E