74HC193 Synchronous 4-Bit Binary Up/Down Counter
Synchronous 4-bit reversible up/down binary counter with separate Count-Up and Count-Down clocks, asynchronous parallel load (~PL), asynchronous master reset (MR), and cascade outputs.
Aliase:SN74HC193N, 74193, 74HCT193, Up Down Binary Counter
DIP-16 / SOIC-16 Top View
16 Pins
Pinout Table16
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | B | Digital | Parallel Data Input B (Bit 1) |
| 2 | QB | Digital | Counter Output QB (Bit 1) |
| 3 | QA | Digital | Counter Output QA (Bit 0 - LSB) |
| 4 | CPD | Digital | Count-Down Clock Pulse Input (Low-to-High triggered) |
| 5 | CPU | Digital | Count-Up Clock Pulse Input (Low-to-High triggered) |
| 6 | QC | Digital | Counter Output QC (Bit 2) |
| 7 | QD | Digital | Counter Output QD (Bit 3 - MSB) |
| 8 | GND | Ground | Ground Reference (0V) |
| 9 | D | Digital | Parallel Data Input D (Bit 3 - MSB) |
| 10 | C | Digital | Parallel Data Input C (Bit 2) |
| 11 | ~PL | Digital | Parallel Load Input (Active Low — asynchronous, loads A/B/C/D immediately) |
| 12 | ~TCU | Digital | Terminal Count UpCarry Output (Active Low) |
| 13 | ~TCD | Digital | Terminal Count DownBorrow Output (Active Low) |
| 14 | MR | Digital | Master Reset (Active High - Asynchronous Clear to 0) |
| 15 | A | Digital | Parallel Data Input A (Bit 0 - LSB) |
| 16 | VCC | Power | Supply Voltage (2.0V to 6.0V DC) |