SN74390

The SN74390 monolithic circuits contains eight master-slave flip-flops and additional gating to implement two individual four-bit counters in a single package.The '390 incorporate dual divide-by-two and divide-by-five counters,which can be used to implement cycle lengths equal to any whole and/or cumulative multiples of 2 and/or 5 up to divide-by-100.When connected as  a bi-quinary counter,the separate divide-by-two circuit can be used to provide symmetry(a square wave)at the final output stage.

Features of the SN74390 are:(1)all have direct clear for each 4-bit counter; (2)dual 4-bit vesions can significantly improve system densities by reducing counter package count by 50%; (3)typical maximum count frequency:35MHz; (4)buffered outputs reduce possibility of collector commutation.

The absolute maximum ratings of the SN74390 can be summarized as:(1)supply voltage,VCC:7V; (2)input voltage:5.5V; (3)operating free-air temperature range:0 to 70; (4)storage temperature range:-65 to 150.

The electrical characteristics(Ta=25) of the SN74390 can be summarized as:(1)VIK:-1.5V; (2)VOH:2.4V MIN 3.4V TYP; (3)II:1mA; (4)ICC:42mA TYP 69mA MAX.If you want to know more information such as the electrical characteristics ,please download the datasheet in www.seekdatasheet.com .