PAL20L2 PAL DESIGN SPECIFICATION P7018 (SN54/74LS451) BIRKNER/KAZMI/BLASCO 03/10/81 DUAL 8:1 MULTIPLEXER MMI SUNNYVALE, CALIFORNIA 1D0 1D1 1D2 1D3 1D4 1D5 1D6 1D7 2D0 2D1 2D2 GND 2D3 2D4 2D5 2D6 2D7 2Y 1Y S C B A VCC /1Y = /S*/C*/B*/A * /1D0 ;SELECT INPUT 1D0 + /S*/C*/B* A * /1D1 ;SELECT INPUT 1D1 + /S*/C* B*/A * /1D2 ;SELECT INPUT 1D2 + /S*/C* B* A * /1D3 ;SELECT INPUT 1D3 + /S* C*/B*/A * /1D4 ;SELECT INPUT 1D4 + /S* C*/B* A * /1D5 ;SELECT INPUT 1D5 + /S* C* B*/A * /1D6 ;SELECT INPUT 1D6 + /S* C* B* A * /1D7 ;SELECT INPUT 1D7 /2Y = /S*/C*/B*/A * /2D0 ;SELECT INPUT 2D0 + /S*/C*/B* A * /2D1 ;SELECT INPUT 2D1 + /S*/C* B*/A * /2D2 ;SELECT INPUT 2D2 + /S*/C* B* A * /2D3 ;SELECT INPUT 2D3 + /S* C*/B*/A * /2D4 ;SELECT INPUT 2D4 + /S* C*/B* A * /2D5 ;SELECT INPUT 2D5 + /S* C* B*/A * /2D6 ;SELECT INPUT 2D6 + /S* C* B* A * /2D7 ;SELECT INPUT 2D7 FUNCTION TABLE C B A 1D0 1D1 1D2 1D3 1D4 1D5 1D6 1D7 2D0 2D1 2D2 2D3 2D4 2D5 2D6 2D7 S 1Y 2Y ;SELECT INPUTS INPUTS OUTPUTS COMMENTS ; 1D- 2D- ; C B A 01234567 01234567 S 1Y 2Y ----------------------------------------------------------------- L L L LHHHHHHH LHHHHHHH L L L 1D0=0 2D0=0 L L L HLLLLLLL LHHHHHHH L H L 1D0=1 2D0=0 L L L LHHHHHHH HLLLLLLL L L H 1D0=0 2D0=1 L L L HLLLLLLL HLLLLLLL L H H 1D0=1 2D0=1 L L L HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES L L H HLHHHHHH HLHHHHHH L L L 1D1=0 2D1=0 L L H LHLLLLLL HLHHHHHH L H L 1D1=1 2D1=0 L L H HLHHHHHH LHLLLLLL L L H 1D1=0 2D1=1 L L H LHLLLLLL LHLLLLLL L H H 1D1=1 2D1=1 L L H HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES L H L HHLHHHHH HHLHHHHH L L L 1D2=0 2D2=0 L H L LLHLLLLL HHLHHHHH L H L 1D2=1 2D2=0 L H L HHLHHHHH LLHLLLLL L L H 1D2=0 2D2=1 L H L LLHLLLLL LLHLLLLL L H H 1D2=1 2D2=1 L H L HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES L H H HHHLHHHH HHHLHHHH L L L 1D3=0 2D3=0 L H H LLLHLLLL HHHLHHHH L H L 1D3=1 2D3=0 L H H HHHLHHHH LLLHLLLL L L H 1D3=0 2D3=1 L H H LLLHLLLL LLLHLLLL L H H 1D3=1 2D3=1 L H H HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES H L L HHHHLHHH HHHHLHHH L L L 1D4=0 2D4=0 H L L LLLLHLLL HHHHLHHH L H L 1D4=1 2D4=0 H L L HHHHLHHH LLLLHLLL L L H 1D4=0 2D4=1 H L L LLLLHLLL LLLLHLLL L H H 1D4=1 2D4=1 H L L HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES H L H HHHHHLHH HHHHHLHH L L L 1D5=0 2D5=0 H L H LLLLLHLL HHHHHLHH L H L 1D5=1 2D5=0 H L H HHHHHLHH LLLLLHLL L L H 1D5=0 2D5=1 H L H LLLLLHLL LLLLLHLL L H H 1D5=1 2D5=1 H L H HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES H H L HHHHHHLH HHHHHHLH L L L 1D6=0 2D6=0 H H L LLLLLLHL HHHHHHLH L H L 1D6=1 2D6=0 H H L HHHHHHLH LLLLLLHL L L H 1D6=0 2D6=1 H H L LLLLLLHL LLLLLLHL L H H 1D6=1 2D6=1 H H L HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES H H H HHHHHHHL HHHHHHHL L L L 1D7=0 2D7=0 H H H LLLLLLLH HHHHHHHL L H L 1D7=1 2D7=0 H H H HHHHHHHL LLLLLLLH L L H 1D7=0 2D7=1 H H H LLLLLLLH LLLLLLLH L H H 1D7=1 2D7=1 H H H HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES X X X LLLLLLLL LLLLLLLL H H H STROBE TEST 0 X X X HHHHHHHH HHHHHHHH H H H STROBE TEST 1 ----------------------------------------------------------------- DESCRIPTION THIS IS AN EXAMPLE OF A DUAL 8-TO-1 MULTIPLEXER USING A PAL20L2. A STROBE LINE (S) IS PROVIDED TO GATE THE OUTPUTS OFF (Y=H) WHEN THE STROBE INPUT IS HIGH. THE SELECT LINES A,B,C ARE ENCODED IN BINARY, WITH A REPRESENTING THE LSB. OPERATIONS TABLE: -----INPUTS----- OUTPUTS SELECT STROBE C B A S Y ---------------------------- X X X H H L L L L D0 L L H L D1 L H L L D2 L H H L D3 H L L L D4 H L H L D5 H H L L D6 H H H L D7 ----------------------------