The 74LS193 is a UP/DOWN DIP-16 Binary Counter. Separate Count Up and Count Down Clocks are used and in either counting mode the circuits operate synchronously. The outputs change state synchronously with the LOW-to-HIGH transitions on the clock inputs. Separate Terminal Count Up and Terminal Count Down outputs are provided which are used as the clocks for a subsequent stage without extra logic, thus simplifying multistage counter designs. Individual preset inputs allow the circuits to be used as programmable counters. Both the Parallel Load (PL) and the Master Reset (MR) inputs asynchronously override the clocks.
Features:-
- Low Power 95 mW Typical Dissipation
- High Speed 40 MHz Typical Count Frequency
- Synchronous Counting
- Asynchronous Master Reset and Parallel Load
- Individual Preset Inputs
- Cascading Circuitry Internally Provided
- Input Clamp Diodes Limit High-Speed Termination Effects
Pin Configuration:
| Pin No. | Pin Name |
| 1 | P1 ~ B |
| 2 | Q1 ~ QB |
| 3 | Q0 ~ QA |
| 4 | CPD |
| 5 | CPU |
| 6 | Q2 ~ QC |
| 7 | Q3 ~ QD |
| 8 | GND |
| 9 | P3 ~ D |
| 10 | P2 ~ C |
| 11 | PL̅(Active Low) |
| 12 | TCU̅(Active Low) |
| 13 | TCD̅(Active Low) |
| 14 | MR |
| 15 | P0 ~ A |
| 16 | VCC |
| Pin | Description |
| CPU | Count up clock pulse input |
| CPD | Count down clock pulse input |
| MR | Asynchronous Master Reset(Clear) input |
| PL̅ | Asynchronous Parallel Load(Active Low) Input |
| TCU | Terminal count Up(Carry) output |
| TCD | Terminal count Down(Borrow) output |
| A,B, C, & D | Preset Inputs(Parallel Data Inputs) |
| Qn | Flip-Flop Outputs |
Specifications:-
| Symbol | Parameter | | Min | Typ | Max | Unit |
| VCC | Supply Voltage | 74 | 4.75 | 5 | 5.25 | V |
| TA | Operating Ambient Temperature Range | 74 | 0 | 25 | 70 | °C |
| IOH | Output Current — High | 74 | | | -0.4 | mA |
| IOL | Output Current — Low | 74 | | | 8 | mA |
