TI CD74HC390EE4

The SN74HC390 and 'HCT390 devices contain 2 independent 4-bit decade ripple counters with asynchronous clear, clocked on the falling edge. Each counter is divided into two sections: a divide-by-2 counter and a divide-by-5 counter, each with a separate clock input. This allows flexible configuration of the device.

• 2 BCD decade or bi-quinary counters configurable for divide-by-2, divide-by-4, divide-by-5, divide-by-10, divide-by-20, divide-by-25, divide-by-50, divide-by-100 modes
• 2 master reset inputs for independent clearing of each decade counter
• Fan-out (over temperature range): 10 LSTTL loads for standard outputs; 15 LSTTL loads for bus driver outputs
• Wide operating temperature range: -55℃ to 125℃
• Balanced propagation delay and transition times
• Significantly reduced power consumption compared to LSTTL logic ICs
• HC type operating voltage: 2V to 6V
• HC type high noise immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
• HCT type operating voltage: 4.5V to 5.5V
• HCT type direct LSTTL input logic compatibility: VIL = 0.8V (max), VIH = 2V (min)
• HCT type CMOS input compatibility at VOL, VOH voltage levels: Il ≤ 1µA