SN54LS56

The SN54LS56 is a type of frequency divider, which is particularly useful in generating one second or one hour timing pulses from 50Hz or 60Hz. The SN54LS56 contains three separate counters, A, B, and C on a single monolithic substr act.

Features of SN54LS56 are: (1)performs 50 to 1 frequency division; (2)avaliable in P or JG package(two P or JG packa ge fit in a single 16-pin socket);(3)maximum clock frequency 25MHz typical.

The absolute maximum ratings and recommended operating conditions of the SN54LS56 can be summarized as: (1)supply voltage: 7V; (2)input voltage: 7V;(3)operating free, air temperature range:-55 to 125;(4)storage temper ature rang:-65 to 150. Recommended operating conditions: (1)supply voltage: 4.5V min, 5V typ and 5.5V max; (2)high-level input voltage: 2V min; (3)low-level input voltage: 0.7V max; (4)high-level output current:-1 max; (5)low -level output current: 8mA max; (6)clock frequency: 0MHz min and 15MHz max; (7)rise and fall time of clock: 50ns max; (8)pulse width of clock or clear: 30ns min; (9)clear inactive state set-up time: 25ns min, etc.