74HCT157DR2G

Series:	74HCT
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Multiplexer
Circuit:	4 x 2:1
Independent Circuits:	1
Current - Output High, Low:	4mA, 4mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-55°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	74HCT157

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Introduction

74HCT157DR2G is a quadruple 1-of-2 Multiplexer/Demultiplexer with two binary inputs and two single-pole dual-throw (SPDT) outputs. The device is fabricated using advanced low-power CMOS technology, utilizing two 11-input NAND gates, two 11-input AND gates and one 8-input NAND gate. The 74HCT logic family allows the use of ECL levels and inputs, combined with the standard logic family output levels. The 74HCT157DR2G, as with all devices in the 74HC logic family, is designed for high speed (tpd= 7.5ns) and low power operation. Moreover, it is specified to meet or exceed JEDEC standards. The output drive capability of the 74HCT157DR2G is specified at 8-mA source and 8-mA sink. The device’s static average current consumption is only 5µA.

Application Fields of the 74HCT157DR2G

The 74HCT157DR2G is ideal for use as a multiplexer/demultiplexer in applications requiring multiplexing/demultiplexing of logic signals, such as bus interface applications. The device can also be used as an array of selectable logic gates, offering significantly simpler logic design than is possible with the traditional IC logic components such as AND, OR, and XOR gates.The 74HC157DR2G can be used in numerous applications requiring signal selection, such as memory addressing and data flow control. Its two 10-bit binary inputs and four SPDT outputs can select one of four data paths, or three data paths plus one override selectable output.The device can also be used to multiplex an 8-bit address bus to a 4-bit input on a memory chip. In this application, the mux can reduce eight lines to four lines on the memory chip, thus eliminating four of the eight decode gates. It can also be used to demultiplex a 4-bit address bus to eight data lines.An important benefit of the 74HC157DR2G is its freedom from latch-up. Because the device is fabricated using low-power CMOS processes, latch up does not occur at any voltage, a problem that can arise with TTL and other technologies.

Working Principle of the 74HCT157DR2G

The 74HCT157DR2G is a low-power CMOS logic IC. The device consists of two 11-input NAND gates, two 11-input AND gates, and one 8-input NAND gate. When one of the select inputs (S0 or S1) is HIGH, the corresponding gate(s) is capable of passing data from one data input (D1 or D2) to the appropriate output. When both select lines are LOW or in the inactive state, both output lines remain in the HIGH state.The 74HCT157DR2G is designed to buffer and multiplex/demultiplex logic signals. When both select lines are HIGH, the 74HCT157DR2G effectively operates as a 2-in 4-out power distribution switch. The device is capable of transferring data between two data inputs (D1 and D2) and one of four outputs (Y0, Y1, Y2, or Y3).

Conclusion

The 74HCT157DR2G is ideal for applications requiring signal selection, multiplexing/demultiplexing of logic signals, memory addressing and data flow control. Moreover, the use of low-power CMOS technology provides for reduced power consumption and a lower susceptibility to latch-up. With its quick switching speed, low power consumption, and latch-up immunity, the 74HCT157DR2G has become a popular choice for applications requiring signal selection and routing.

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