MC74AC350

MC74AC350 MC74ACT350 4ĆBit Shifter With 3ĆState Outputs The MC74AC350/74ACT350 is a specialized multiplexer that accepts a 4-bit word and shifts it 0, 1, 2 or 3 places, as determined by two Select (S0, S1) inputs. For expansion to longer words, three linking inputs are provided for lower-order bits; thus two packages can shift an 8-bit word, four packages a 16-bit word, etc. Shifting by more than three places is accomplished by paralleling the 3-state outputs of different packages and using the Output Enable (OE) inputs as a third Select level. With appropriate interconnections, the ′AC/ACT350 can perform zero-backfill, sign-extend or end-around (barrel) shift functions. Linking Inputs for Word Expansion 3-State Outputs for Extending Shift Range VCC 16 O0 15 O1 14 OE 13 O2 12 O3 11 S0 10 S1 9 N SUFFIX CASE 648-08 PLASTIC 4-BIT SHIFTER WITH 3-STATE OUTPUTS D SUFFIX CASE 751B-05 PLASTIC 1 I–3 2 I–2 3 I–1 4 I0 5 I1 6 I2 7 I3 8 GND TRUTH TABLE Inputs OE H L L L L S1 X L L H H S0 X L H L H O0 Z I0 I–1 I–2 I–3 Outputs O1 Z I1 I0 I–1 I–2 O2 Z I2 I1 I0 I–1 O3 Z I3 I2 I1 I0 10 9 13 1 LOGIC SYMBOL 2 3 4 5 6 7 S0 I–3 I–2 I–1 I0 S1 OE I1 I2 I3 O0 O1 O2 O3 H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial 15 14 12 11 FACT DATA 5-1 MC74AC350 MC74ACT350 FUNCTIONAL DESCRIPTION The MC74AC350/74ACT350 is operationally equivalent to a 4-input multiplexer with the inputs connected so that the select code causes successive one-bit shifts of the data word. This internal co...