The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. The 74LS169 is a fully synchronous 4-stage up/down counter featuring a preset capability for programmable operation, carry lookahead for easy cascading, and a U/D input to control the direction of counting
74LS169 Features
- Programmable Look-Ahead Up/Down Binary Counter
- Fully Synchronous Operation
- Internal Look-Ahead
- Carry Output for Cascading
- Standard TTL Switching Voltages
74LS169 Specifications
| Supply Voltage | 4.75 – 5.25Vdc |
| Maximum Clock Frequency | 40Mhz |
| Power Dissipation | 2mW/gate @100kHz |
| Minimum Output Current | 8mA |
| Propagation Delay | 10nS |
| Fan Out (TTL Loads) | 20 |
74LS169 Pinout Diagram
74LS169 Pin Description
| Pin No | Pin Name | Description |
| 1 | U/D’ | Up/Down (Active Low Pin) |
| 2 | CLK | Clock Pin |
| 3 | A | Data Input Of Counter A |
| 4 | B | Data Input Of Counter B |
| 5 | C | Data Input Of Counter C |
| 6 | D | Data Input Of Counter D |
| 7 | ENP’ | Enable Pin Parallel (Active Low) |
| 8 | GND | Ground Pin |
| 9 | LOAD’ | Load Pin |
| 10 | ENT’ | Enable Pin Trinkle (Active Low) |
| 11 | QD | Counter Output QD |
| 12 | QC | Counter Output QC |
| 13 | QB | Counter Output QB |
| 14 | QA | Counter Output QA |
| 15 | RCO | Ripple Carry Output |
| 16 | VCC | Positive Supply |
Applications
- Self-reversing counter
- Clock divider circuit
74LS169 Alternative Equivalent
74LS191
Download 74LS169 Synchronous Binary Up/Down Counter Datasheet from the link given below.
