M74HC390

M74HC390 Dual decade counter Features ■ HIgh Speed: fMAX = 79MHz (Typ.) at VCC = 6V ■ Low power dissipation: )ICC = 4µA (Max.) at TA = 25°C t(s■ High noise immunity: cVNIH = VNIL = 28 % VCC (Min.) du■ Balanced propagation delays: rotPLH ≅ tPHL P■ Wide operating voltage range: teVCC (Opr) = 2V to 6V le■ Pin and function compatible with 74 series 390 soDescription ObThe M74HC390 is an high speed CMOS dual -decade counter fabricated with silicon gate )C2MOS technology. t(sThis dual decade counter contains two ucindependent ripple carry counters. Each counter dis composed of a divide by two and divide by five rocounter. The divide by two and divide by five Pcounters can be cascaded to form dual decade, dual biquinary, or various combination up to a Obsoletesingle divide by 100 counter. DIP-16 SO-16 Each 4-bit counter is increased on the high to low transition (negative edge) of the clock input, and each has an independent clear input. When clear is set low all four bits of each counter are set to low. This enables count truncation and allows the implementation of divide by N counter configuration. All inputs are equipped with protection circuits against static discharge and transient excess voltage. Order codes Part number Package Packaging M74HC390B1R M74HC390RM13TR DIP-14 SO-14 Tube Tape and reel July 2006 Rev 2 1/17 www.st.com 17 Contents Contents M74HC390 1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...