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   N° série générique : 7457
   Description : Frequency divider.Can generate one second timing pulses from 60 Hz.Two '57 devices may be interconnected to give frequency division of 3600 to 1,1800 to 1, 900 to 1, etc. Features a reset pin that is common to all three counters.

Broches :
____________
|            |
 CLKB| 1         8|   QC
  VCC| 2         7|   QB
   QA| 3         6|  RST
  GND| 4         5| CLKA
|____________|