DF12x is a family of static, master-slave D flip-flops. SET and RESET are asynchronous and active low. Outputs are buffered and change state on the rising edge of the clock. Logic Symbol DF12x DSQ C RQ Truth Table SN RN LL LH HL HH HH HH IL = Illegal D X X X L H X C Q QN X IL IL XHL XLH ↑LH ↑HL .