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CMOS Dual Up-counters
CD4520 Dual Binary Up-counter each consist of two identical, internally synchronous 4-stage counters. The counter stages are D-type flip-flops having interchangeable CLOCK and ENABLE lines for incrementing on either the positive going or negative going transition.
Management:AD, BB , BT , MAXIM , LATTICE , CYPRESS , XILINX , ALTERA , MOTOROLA ,
TI , INTEL, HARRIS , NS , FSC , TOS, PHILLIPS , ATMEL , MIC, IDT , WSI, Resitance,
electronic capacity , Diode , Audion , and so on.