Y Counts 8-4-2-1 BCD or binary Y Single down up count control line Y Count enable control input Y Ripple clock output for cascading Y Asynchronously presettable with load.

Y Average propagation delay 20 ns Y Typical clock frequency 25 MHz Y Typical power dissipation 100 mW Connection Diagra.

These circuits are synchronous reversible up down counters The LS191 is a 4-bit binary counter and the LS190 is a BCD counter Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change simultaneously .

DM74LS191

DM74LS192

DM74LS193

DM74LS194A

DM74LS196

DM74LS197

DM74LS10

DM74LS107A

DM74LS109A

DM74LS11

DM74LS112A

DM74LS123

DM74LS125A