Dual 4-bit Decade Ripple Counter IC - 74HC390
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The 74HC Series 74HC390 IC is a 16 Pin Dual 4-bit Decade Ripple Counter IC having a 2V to 6V Operating Voltage range. It has been divided into four separately clocked sections. The counters have two divide-by-2 sections and two divide-by-5 sections. These sections share an asynchronous master reset input (nMR) and can be used in a BCD decade or bi-quinary configuration. If master reset inputs 1MR and 2MR are used to clear all 8 bits of the counter simultaneously, numerous counting configurations are possible within one package.
Section clocks nCP0 and nCP1, allow ripple counter or frequency division applications of divide-by-2, 4, 5, 10, 20, 25, 50 or 100. The HIGH-to-LOW transition of the clock inputs nCP0 and nCP1 triggers each section. For BCD decade operation, the nQ0 output is connected to the nCP1 input of the divide-by-5 section. For bi-quinary decade operation, the nQ3 output is connected to the nCP0 input and nQ0 becomes the decade output. A HIGH on the nMR input overrides the clocks and sets the four outputs LOW. Inputs include clamp diodes. It enables the use of current-limiting resistors to interface inputs to voltages in excess of VCC.
| Symbol | Pin | Description |
| 1CP0, 2CP0 | 1, 15 | Clock input divide-by-2 section (HIGH-to-LOW; edge-triggered) |
| 1MR, 2MR | 2, 14 | Asynchronous master reset input (active HIGH) |
| 1Q0, 1Q1, 1Q2, 1Q3 | 3, 5, 6, 7 | Flip-flop outputs |
| 1CP1, 2CP1 | 4, 12 | Clock input divide-by-5 section (HIGH-to-LOW; edge-triggered) |
| GND | 8 | Ground (0 V) |
| 2Q0, 2Q1, 2Q2, 2Q3 | 13, 11, 10, 9 | Flip-flop output |
| VCC | 16 | Supply voltage |
Selected qty of IC - 74HC390
| Operating Voltage Range | 2.0 to 6.0 V |
| Package | DIP?16 |
| Input Current | 1 uA |
| Powering Current | 160 uA |
| Output Current at VCC | 4 mA |
| Fan-Out | 10 LS-TTL Load |
| Propagation Delay | 14 ns |
| Temperature Range | -65 °C to +150 °C |
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