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74ls196


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                                                                                                    SN54/74LS196
4-STAGE PRESETTABLE                                                                                 SN54/74LS197
RIPPLE COUNTERS
   The SN54/74LS196 decade counter is partitioned into divide-by-two and di-
vide-by-five sections which can be combined to count either in BCD (8, 4, 2, 1)
sequence or in a bi-quinary mode producing a 50% duty cycle output. The                                 4-STAGE PRESETTABLE
SN54/74LS197 contains divide-by-two and divide-by-eight sections which                                    RIPPLE COUNTERS
can be combined to form a modulo-16 binary counter. Low Power Schottky
                                                                                                        LOW POWER SCHOTTKY
technology is used to achieve typical count rates of 70 MHz and power dis-
sipation of only 80 mW.
   Both circuit types have a Master Reset (MR) input which overrides all other
inputs and asynchronously forces all outputs LOW. A Parallel Load input (PL)
overrides clocked operations and asynchronously loads the data on the Par-
allel Data inputs (Pn) into the flip-flops. This preset feature makes the circuits
                                                                                                                               J SUFFIX
usable as programmable counters. The circuits can also be used as 4-bit                                                        CERAMIC
latches, loading data from the Parallel Data inputs when PL is LOW and stor-                                                  CASE 632-08
ing the data when PL is HIGH.                                                                      14
                                                                                                        1



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