======================================================================== 74F153 DUAL 4-INPUT MULTIPLEXER ======================================================================== Family: Fairchild FAST (Advanced Schottky TTL) Source: 1980 Fairchild FAST Data Book, pages 4-19 ... 4-21 Status: Released data sheet Ratings: Vcc = +5.0 V +/-5%, TA = 0 to +70 deg C DESCRIPTION ----------- The 'F153 is a high speed dual 4-input multiplexer with common select inputs and individual enable inputs for each section. It can select two lines of data from four sources. The two buffered outputs present data in the true (non-inverted) form. In addition to multiplexer operation, the 'F153 can generate any two functions of three variables. FUNCTIONAL DESCRIPTION ---------------------- The 'F153 can select two bits of data from up to four sources under the control of the common Select inputs (S0, S1). The two 4-input multiplexer circuits have individual active LOW Enables (/Ea, /Eb) which can be used to strobe the outputs independently. When the Enables are HIGH, the corresponding outputs (Za, Zb) are forced LOW. The 'F153 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. Za = /Ea * ( I0a*/S1*/S0 + I1a*/S1*S0 + I2a*S1*/S0 + I3a*S1*S0 ) Zb = /Eb * ( I0b*/S1*/S0 + I1b*/S1*S0 + I2b*S1*/S0 + I3b*S1*S0 ) The 'F153 can be used to move data from a group of registers to a common output bus; the particular register from which the data came would be determined by the state of the Select inputs. A less obvious application is as a FUNCTION GENERATOR -- the 'F153 can generate two functions of three variables, which is useful for implementing highly irregular random logic. CONNECTION DIAGRAM (16-pin DIP) ------------------------------- Pin Function Pin Function --- ------------------------------- --- ------------------------------- 1 /Ea Side A Enable (active LOW) 16 Vcc 2 S1 Common Select 1 15 /Eb Side B Enable (active LOW) 3 I3a Side A data input 3 14 S0 Common Select 0 4 I2a Side A data input 2 13 I3b Side B data input 3 5 I1a Side A data input 1 12 I2b Side B data input 2 6 I0a Side A data input 0 11 I1b Side B data input 1 7 Za Side A output 10 I0b Side B data input 0 8 GND 9 Zb Side B output TRUTH TABLE (each side) ----------------------- S0 S1 /E I0 I1 I2 I3 Z -- -- -- -- -- -- -- - X X H X X X X L L L L L X X X L L L L H X X X H H L L X L X X L H L L X H X X H L H L X X L X L L H L X X H X H H H L X X X L L H H L X X X H H H = HIGH Voltage Level; L = LOW Voltage Level; X = Immaterial. The table applies to each side. For the A side, read /E as /Ea, I0 - I3 as I0a - I3a and Z as Za; for the B side, read /E as /Eb, I0 - I3 as I0b - I3b and Z as Zb. S0 and S1 are common to both sides. INPUT LOADING / FAN-OUT ----------------------- Pin Names Description U.L. HIGH/LOW ----------- -------------------------------- ------------- I0a - I3a Side A Data Inputs 0.5 / 0.375 I0b - I3b Side B Data Inputs 0.5 / 0.375 S0, S1 Common Select Inputs 0.5 / 0.375 /Ea Side A Enable Input (Active LOW) 0.5 / 0.375 /Eb Side B Enable Input (Active LOW) 0.5 / 0.375 Za Side A Output 25 / 12.5 Zb Side B Output 25 / 12.5 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE --------------------------------------------------- Symbol Description Min Typ Max Units Conditions ------ -------------------- --- --- --- ----- -------------------- ICC Power Supply Current 12 20 mA Vcc = Max, VIN = Gnd AC CHARACTERISTICS ------------------ Symbol Parameter Min Typ Max Units ------ --------------------------- --- --- --- ----- tPLH Propagation Delay Sn to Zn 3.0 9.5 13 ns tPHL Propagation Delay Sn to Zn 3.0 8.0 10 ns tPLH Propagation Delay /En to Zn 3.0 8.0 12 ns tPHL Propagation Delay /En to Zn 3.0 7.5 12 ns tPLH Propagation Delay In to Zn 2.0 5.0 8.0 ns tPHL Propagation Delay In to Zn 2.0 4.5 6.5 ns