name:         STA013
function:     Mpeg 2.5 Layer III audio decoder
package:      SOIC28?,28
manufacturer: ST

        +--()--+
  Vdd_1 | 1  28| out_clk/data_req
  Vss_2 | 2  27| Vss_5
    sda | 3  26| reset
    scl | 4  25| scanen
    sdi | 5  24| testen
   sckr | 6  23| Vdd_4
 bit_en | 7  22| Vss_4
scr_int | 8  21| xti
    sdo | 9  20| xto
   sckt |10  19| filt
  lrckt |11  18| pvss
   oclk |12  17| pcdd
  Vss_2 |13  16| Vdd_3
  Vdd_2 |14  15| Vss_3
        +------+


This pinout came from the Chipdir:
http://www.chipdir.org/