M74HCT157B1R

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M74HCT157B1R is a signal switch device, which belongs to the Logic - Signal Switches, Multiplexers, Decoders family. It is a low-power, 4-Bit Decoders/De-Multiplexers composed of four identical four-way multiplexer circuits, each with an independent address (nY0-nY3) output and a common active-low output enable (OE) input. Using this device, a BCD (Binary Coded Decimal) or binary code can be decoded into an individual output.

Application Field

M74HCT157B1R can be used for system level address decoding, priority encoding, memory decoding and address selection. For example: if the 4-bit binary input code, each bit can be selected from one of the 16 address location in a 4K or 16K memory location. Another example from BCD to multiplexer application, the decoder can be used to select from one of the ten active-high outputs for each nibble of BCD input code.

Working Principle

M74HCT157B1R working principle is based on CMOS technology and has the same performance characteristics of other CMOS devices, such as low-power dissipation, high noise immunity, and a direct interface to like logic gate. The total 4-bit code can be applied to active-low-enable input, and the decoder’s output logic is determined by the position of the select inputs (nY0-nY3). When a logic ‘0’ is applied to the OE input, all output lines go to a high-impedance state.

The M74HCT157B1R has the capability of decoding both binary and BCD codes.A binary code will turn all output lines off except the single line corresponding to the input code. For example, if a binary code 0110 is applied to the inputs, the outputs Y7 to Y4 will be off and Y3 will be in the active low state. When a BCD code is applied to the inputs, all output lines will turn off except for the lines corresponding to the first nibble of BCD input code.

For example, if a BCD code 5 is applied to the inputs, then outputs Y7 to Y2 will be off and Y1 and Y0 will be in their active low states. The outputs of the decoder are fully buffered by default and are capable of driving the inputs of a level shifter device in order to interface between two different logic families.

MCU is an important part of the above applications. Through programming, a variety of FPGA-based solutions can be produced and a wide range of fields such as embedded/automotive products, aerospace, etc. are able to benefit from it. By acting as a bridge between different logic families or as a bridge between BCD and binary code, M74HCT157B1R can provide a comprehensive symbolic solution to a variety of problems.

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