SN54LS253
SN54LS253 is DUAL 4-INPUT MULTIPLEXER manufactured by Motorola Semiconductor.
DESCRIPTION
The LS253 contains two identical 4-Input Multiplexers with 3-state outputs. They select two bits from four sources selected by mon select inputs (S0, S1). The 4-input multiplexers have individual Output Enable (E0a, E0b) inputs which when HIGH, forces the outputs to a high impedance (high Z) state. The LS253 is the logic implementation of a 2-pole, 4-position switch, where the position of the switch is determined by the logic levels supplied to the two select inputs. The logic equations for the outputs are shown below: Za = E0a ⋅ (I0a ⋅ S1 ⋅ S0 + I1a ⋅ S1 ⋅ S0 ⋅ I2a ⋅ S1 ⋅ S0 + I3a ⋅ S1 ⋅ S0) Zb = E0b ⋅ (I0b ⋅ S1 ⋅ S0 + I1b ⋅ S1 ⋅ S0 ⋅ I2b ⋅ S1 ⋅ S0 + I3b ⋅ S1 ⋅ S0) TRUTH TABLE
SELECT INPUTS S0 X L L H H L L H H S1 X L L L...
