●The HC157, HCT157, HC158, and HCT158 are quad 2-input multiplexers which select four bits of data from two sources under the control of a common Select input (S). The Enable input (E\\) is active Low. When (E\\) is High, all of the outputs in the 158, the inverting type, (1Y\\-4Y\\) are forced High and in the 157, the non-inverting type, all of the outputs (1Y\\-4Y\\) are forced Low, regardless of all other input conditions.
●Moving data from two groups of registers to four common output busses is a common use of these devices. The state of the Select input determines the particular register from which the data comes. They can also be used as function generators.
● Common Select Inputs
● Separate Enable Inputs
● Buffered inputs and Outputs
● Fanout (Over Temperature Range)
● Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
● Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
● Wide Operating Temperature Range . . . -55°C to 125°C
● Balanced Propagation Delay and Transition Times
● Significant Power Reduction Compared to LSTTL Logic ICs
● HC Types
● 2V to 6V Operation
● High Noise Immunity: NIL = 30%, NIH = 30%of VCC at VCC = 5V
● HCT Types
● 4.5V to 5.5V Operation
● Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
● CMOS Input Compatibility, Il 1µA at VOL, VOH
●The CD54HC158 and CD74HC158 are obsolete and no longer are supplied.
