======================================================================== 74F151 8-INPUT MULTIPLEXER ======================================================================== Family: Fairchild FAST (Advanced Schottky TTL) Source: 1980 Fairchild FAST Data Book, pages 4-16 ... 4-18 Status: PRELIMINARY -- page 4-16 carries a "Preliminary" watermark. Ratings: Vcc = +5.0 V +/-5%, TA = 0 to +70 deg C DESCRIPTION ----------- The 'F151 is a high speed 8-input digital multiplexer. It provides in one package, the ability to select one line of data from up to eight sources. The 'F151 can be used as a universal function generator to generate any logic function of four variables. Both assertion and negation outputs are provided. FUNCTIONAL DESCRIPTION ---------------------- The 'F151 is a logical implementation of a single pole, 8-position switch with the switch position controlled by the state of three Select inputs, S0, S1, S2. Both assertion and negation outputs are provided. The Enable input (/E) is active LOW. When it is not activated, the negation output is HIGH and the assertion output is LOW regardless of all other inputs. The logic function provided at the output is: Z = /E * ( I0*/S0*/S1*/S2 + I1*S0*/S1*/S2 + I2*/S0*S1*/S2 + I3*S0*S1*/S2 + I4*/S0*/S1*S2 + I5*S0*/S1*S2 + I6*/S0*S1*S2 + I7*S0*S1*S2 ) The 'F151 provides the ability, in one package, to select from eight sources of data or control information. By proper manipulation of the inputs, the 'F151 can provide any logic function of four variables and its negation. CONNECTION DIAGRAM (16-pin DIP) ------------------------------- Pin Function Pin Function --- ------------------------------ --- ------------------- 1 I3 Data input 3 16 Vcc 2 I2 Data input 2 15 I4 Data input 4 3 I1 Data input 1 14 I5 Data input 5 4 I0 Data input 0 13 I6 Data input 6 5 Z Data output 12 I7 Data input 7 6 /Z Inverted data output 11 S0 Select input 0 7 /E Enable input (active LOW) 10 S1 Select input 1 8 GND 9 S2 Select input 2 TRUTH TABLE ----------- /E S2 S1 S0 /Z Z -- -- -- -- --- --- H X X X H L L L L L /I0 I0 L L L H /I1 I1 L L H L /I2 I2 L L H H /I3 I3 L H L L /I4 I4 L H L H /I5 I5 L H H L /I6 I6 L H H H /I7 I7 H = HIGH Voltage Level; L = LOW Voltage Level; X = don't care. /I0 ... /I7 denote the complement of the corresponding data input. INPUT LOADING / FAN-OUT ----------------------- Pin Names Description U.L. HIGH/LOW ----------- ------------------------- ------------- I0 - I7 Data Inputs 0.5 / 0.375 S0 - S2 Select Inputs 0.5 / 0.375 /E Enable Input (Active LOW) 0.5 / 0.375 Z Data Output 25 / 12.5 /Z Inverted Data Output 25 / 12.5 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE --------------------------------------------------- Symbol Parameter Min Typ Max Units Conditions ------ -------------------- --- --- --- ----- ---------------------- ICC Power Supply Current 11 mA Vcc = Max, VIN = 4.5 V AC CHARACTERISTICS ------------------ Symbol Parameter Min Typ Max Units ------ -------------------------- --- --- --- ----- tPLH Propagation Delay Sn to /Z -- 6.3 -- ns tPHL Propagation Delay Sn to /Z -- 6.2 -- ns tPLH Propagation Delay Sn to Z -- 8.1 -- ns tPHL Propagation Delay Sn to Z -- 7.9 -- ns tPLH Propagation Delay /E to /Z -- 4.6 -- ns tPHL Propagation Delay /E to /Z -- 4.5 -- ns tPLH Propagation Delay /E to Z -- 6.4 -- ns tPHL Propagation Delay /E to Z -- 6.2 -- ns tPLH Propagation Delay In to /Z -- 2.9 -- ns tPHL Propagation Delay In to /Z -- 2.8 -- ns tPLH Propagation Delay In to Z -- 4.7 -- ns tPHL Propagation Delay In to Z -- 4.5 -- ns