74LS42 BCD to Decimal Decoder
Package PDIP, SOIC Series 74LS
74LS42 overview
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. 74LS42 BCD to Decimal Decoder monolithic BCD-to-decimal decoders 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. Full decoding of
valid input logic ensures that all outputs remain off for all invalid input conditions.
Key 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
Datasheet
42.pdf
74LS42 features
- Multipurpose Decoder
- Mutually Exclusive Outputs
- Demultiplexing Capability
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS42 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | 0 | Decoder Output Bit 0 |
| 2 | 1 | Decoder Output Bit 1 |
| 3 | 2 | Decoder Output Bit 2 |
| 4 | 3 | Decoder Output Bit 3 |
| 5 | 4 | Decoder Output Bit 4 |
| 6 | 5 | Decoder Output Bit 5 |
| 7 | 6 | Decoder Output Bit 6 |
| 8 | GND | Ground |
| 9 | 7' | Decoder Output Bit 7 |
| 10 | 8' | Decoder Output Bit 8 |
| 11 | 9' | Decoder Output Bit 9 |
| 12 | A3 | Binary Input A3 |
| 13 | A2 | Binary Input A2 |
| 14 | A1 | Binary Input A1 |
| 15 | A0 | Binary Input A0 |
| 16 | VCC | Positive Supply |
74LS42 applications
- It is used in code conversions
- It may also be used for data distribution i.e. demultiplexing.
Comments 0
Leave a comment