SN54LS591

The SN54LS591 contains an 8-bit binary counter that feeds an 8-bit storage register. The features of SN54LS591 are as follows: (1)8-bit counter with register; (2)parallel regiater outputs; (3)choice of 3-state or open-collector register outputs; (4)guaranteed counter frequency: DC to 20MHz.

The absolute maximum ratings of the SN54LS591 are: (1)supply voltage, VCC: 7V; (2)input voltage: 7V; (3)off-state output voltage: 5.5V; (4)operating free-air temperature range: -55 to 125; (4)storage temperature range: -65 to 150.

The following is about the electrical characteristics of SN54LS591: (1)supply voltage: 4.5V min, 5V typical and 5.5V max; (2)high-level input voltage: 2V min; (3)low-level input voltage: 0.7V max; (4)high-level output voltage: 5.5V max; (5)high-level output current: -1mA max; (6)low-level output current: 8mA max; (7)counter clock frequency: 0MHz min and 20MHz max; (8)register clock frequency: 0MHz min and 25MHz max; (9)setup time: 20ns min; (10)operating free-air temperature: -55 to 125.