74HC161 Synchronous 4-Bit Binary Counter (Asynchronous Clear)
Synchronous presettable 4-bit binary counter with asynchronous master reset, look-ahead carry outputs, and synchronous parallel loading.
Aliase:SN74HC161N, 74HCT161, 4-Bit Binary Counter
DIP-16 Top View
16 Pins
Pinout Table16
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | ~CLR | Digital | Master Reset / Clear (Active Low Asynchronous) |
| 2 | CLK | Digital | Clock Input (Active Rising Edge) |
| 3 | A | Digital | Parallel Data Input A (LSB) |
| 4 | B | Digital | Parallel Data Input B |
| 5 | C | Digital | Parallel Data Input C |
| 6 | D | Digital | Parallel Data Input D (MSB) |
| 7 | ENP | Digital | Count Enable Parallel Input |
| 8 | GND | Ground | System Ground (0V) |
| 9 | ~LOAD | Digital | Parallel Load Enable Input (Active Low Synchronous) |
| 10 | ENT | Digital | Count Enable Trickle Input (Enables RCO) |
| 11 | QD | Digital | Counter Output D (Bit 3 / MSB) |
| 12 | QC | Digital | Counter Output C (Bit 2) |
| 13 | QB | Digital | Counter Output B (Bit 1) |
| 14 | QA | Digital | Counter Output A (Bit 0 / LSB) |
| 15 | RCO | Digital | Ripple Carry Output (High at Terminal Count 15) |
| 16 | VCC | Power | Positive Supply Voltage (+2V to +6V) |