74ALS251

INTEGRATED CIRCUITS 74ALS251 8–input multiplexer (3–State) Product specification IC05 Data Handbook 1991 Feb 08 Philips Semiconductors Philips Semiconductors Product specification 8-input multiplexer (3-State) 74ALS251 FEATURES 8-to-1 multiplexing On chip decoding Multifunction capability Inverting and non-inverting outputs Both outputs are 3-State for further multiplexer expansion DESCRIPTION The 74ALS251 is a logic implementation of a single 8-position switch with the switch position controlled by the state of three select (S0, S1, S2) inputs. True (Y) and complementary (Y) outputs are both provided. The output enable (OE) is active Low. When OE is High, both outputs are in High impedance state, allowing multiple connections to a common bus without driving nor loading the bus significantly. When the outputs of more than one device are tied together, the user must ensure that there is no overlap in the active-Low portion of the output enable voltages in order to avoid high currents that could exceed the maximum current rating. TYPICAL SUPPLY CURRENT (TOTAL) 7.5mA PIN CONFIGURATION I3 I2 I1 I0 Y Y OE GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC I4 I5 I6 I7 S0 S1 S2 SC00066 ORDERING INFORMATION ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C 74ALS251N 74ALS251D DRAWING NUMBER TYPE 74ALS251 TYPICAL PROPAGATION DELAY 7.0ns 16-pin plastic DIP 16-pin plastic SO SOT38-4 SOT109-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS I...