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. 74LS145 BCD-to-decimal decoder/drivers consist of eight inverters and ten four-input NAND gates. The inverters are connected in pairs to make BCD input data available for decoding by the NAND gates.
74LS145 Features
- Single BCD-to-Decimal Decoder
- Inputs Clamped with Schottky Diodes
- Open Collector Outputs
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS145 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 |
74LS145 Pinout Diagram
74LS145 Pin Description
| Pin No | Pin Name | Description |
| 1 | Q0 | Output pin 0 |
| 2 | Q1 | Output pin 1 |
| 3 | Q2 | Output pin 2 |
| 4 | Q3 | Output pin 3 |
| 5 | Q4 | Output pin 4 |
| 6 | Q5 | Output pin 5 |
| 7 | Q6 | Output pin 6 |
| 8 | GND | Ground Pin |
| 9 | Q7 | Output pin 7 |
| 10 | Q8 | Output pin 8 |
| 11 | Q9 | Output pin 9 |
| 12 | P3 | BCD Input 3 |
| 13 | P2 | BCD Input 2 |
| 14 | P1 | BCD Input 1 |
| 15 | P0 | BCD Input 0 |
| 16 | VCC | Positive Supply |
Applications
- It is used in code conversion. i.e analog to digital conversion in the analog decoder.
- It may also be used for data distribution.
- In a high-performance memory system, this decoding can be used to minimize the effect of system decoding.
74LS145 Alternative Equivalent
74LS42
Download 74LS145 BCD-to-decimal Decoder/Driver Datasheet from the link given below.
