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1991-01-12
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5KB
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99 lines
PAL20L2 PAL DESIGN SPECIFICATION
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
;equations go here
/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
; SEL --------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
-------------------------------------------------------------------------
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 is high.
The select lines A,B,C are encoded in binary, with A representing the LSB.
OPERATIONS TABLE:
INPUTS OUTPUTS
SELECT STB
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
-------------------