* Y Y Y Y Y Y Y Y Y Y Counts 8-4-2-1 BCD or binary Single down up count control line Count enable control input Ripple clock output for cascading Asynchronously presettable with load control Parallel outputs Cascadable for n-bit applications Average propagation delay 20 ns Typical clock frequency 25
54LS190
National Semiconductor
180.58 KB
Synchronous 4-bit up/down counters.
DM54LS190 DM74LS190 DM54LS191 DM74LS191 Synchronous 4-Bit Up Down Counters with Mode Control May 1989 DM54LS190 DM74LS190 DM54LS191 DM74LS191 Synchr.
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