DESCRIPTION
The Enable Input (E) is active LOW. When E is HIGH, all of the outputs (Z) are forced HIGH regardless of all other inputs. The LS158 is the logic implementation of a 4-pole, 2-position switch where the position of the switch is deter- mined by the logic levels supplied to the Select Input. A common use of the LS158 is the moving of data from two groups of registers to four common output busses. The particular register from which the data comes is determined by the state of the Select Input. A less obvious use is as a function generator. The LS158 can generate four functions of two variables with one variable common. This is useful for implementing gating functions. TRUTH TABLE ENABLE E H L L L L H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care SELECT INPUT S X L L H H INPUTS I0 X L H X X I1 X X X L H OUTPUT Z H H L H L GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current — High Output Current — Low Pa...
Motorola
