HD74LS157

The HD74LS157 is a kind of data selector/multiplexer contains inverters and drivers to supply full on-chip data selection to the four output gates.A separate strobe input is provided.A 4-bit word is selected from one of two sources and is rounted to the four outputs.Then, outputs present true data to minimize propegation delay time.

The electrical specifications of the HD74LS157 can be summarized as:(1): input voltage(Vin) is 2.0 V min; (2): output voltage(Vout) is 2.7 V mi when Vcc is 4.75 V, Vin is 2 V and Ion is -400 uA; (3): short-circuit output current(Ios) is -20 mA min and -100 mA max when Vcc is 5.25 V; (4): supply current(Iccs) is 9.7 mA typ and 16 mA max when Vcc is 5.25 V; (5): input clamp voltage(VIR) is -1.5 V max when Vcc is 4.75 V and Iin is -28 mA.

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