Description
The SN74LS42N is a 4-Line BCD to 10-Line Decimal Decoder manufactured by Texas Instruments, housed in a standard 16-pin PDIP through-hole package. These monolithic BCD-to-decimal decoders consist of eight inverters and ten four-input NAND gates, with the inverters 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, giving reliable, predictable behavior even with unexpected input states.
The SN74LS42's inputs and outputs are compatible for use with most TTL and other saturated low-level logic circuits, with DC noise margins typically around one volt, making it easy to integrate into existing TTL-based digital designs. It decodes BCD inputs into corresponding decimal outputs, enabling accurate numeric display on 7-segment displays and simplifying the process of driving numerical displays in digital systems.
Key features include multifunction capability, mutually exclusive outputs, demultiplexing capability, and input clamp diodes that limit high-speed termination effects.
Key Specifications
- Function: 4-line BCD to 10-line decimal decoder
- Logic Family: TTL, Low Power Schottky (LS)
- Package: 16-pin PDIP (through-hole)
- Operating Temperature: 0°C to 70°C
- Noise Margin: ~1V typical
- Manufacturer: Texas Instruments
Common Applications
- Driving 7-segment displays in digital clocks, calculators, and other numerical output devices
- Counter circuits requiring BCD-to-display decoding
- Signal processing applications requiring numerical data representation
- Demultiplexing applications in general digital logic design
Package Includes
- 1 x SN74LS42N IC (16-pin DIP)