74LS Series ICs are High-Speed Logic gates, ideally a little faster than 74HC series but more power consumption is required. They are implemented with a Low-Power Schottky diode technology to achieve high switching speed. 74LS157 is one of the 74LS series IC. 74LS157 ICs contain four 2-Input Multiplexer. This device has a common active-high select input pin (A’/B) and active-low enable pin (G). When G is HIGH, all of the outputs (Y) are forced LOW regardless of all other inputs. A common use of the LS157 is the moving of data from two groups of registers to four common output busses.The 74LS157 ICs have an operating range of VCC from 4.5 V to 5.5 V. Maximum current consumption is 16 mA through Icc and 0.8 mA per input pin. And the maximum propagation delay is 9 ns. They can provide 0.4 mA at High Input and 8 mA at Low Input. They allow inputs and outputs up to VCC. The recommended operating VCC is 5 V.
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