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1991-01-12
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3KB
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77 lines
PAL16L6 PAL DESIGN SPECIFICATION
74LS453 Bob Metzler 12/30/90
QUAD 3:1 MULTIPLEXER
SPACE NEEDLE,WASHINGTON
1C0 1C1 1C2 2C0 2C1 2C2 3C0 3C1 3C2 4C0 4C1 GND
4C2 A B 4Y 3Y NC NC 2Y 1Y NC NC VCC
;equations go here
/1Y = /B*/A * /1C0 ;SELECT INPUT 1C0
+ /B* A * /1C1 ;SELECT INPUT 1C1
+ B*/A * /1C2 ;SELECT INPUT 1C2
/2Y = /B*/A * /2C0 ;SELECT INPUT 2C0
+ /B* A * /2C1 ;SELECT INPUT 2C1
+ B*/A * /2C2 ;SELECT INPUT 2C2
/3Y = /B*/A * /3C0 ;SELECT INPUT 3C0
+ /B* A * /3C1 ;SELECT INPUT 3C1
+ B*/A * /3C2 ;SELECT INPUT 3C2
/4Y = /B*/A * /4C0 ;SELECT INPUT 4C0
+ /B* A * /4C1 ;SELECT INPUT 4C1
+ B*/A * /4C2 ;SELECT INPUT 4C2
FUNCTION TABLE
B A 1C0 1C1 1C2 2C0 2C1 2C2 3C0 3C1 3C2 4C0 4C1 4C2 1Y 2Y 3Y 4Y
; SEL --------INPUTS-------- --OUTPUTS-- COMMENTS
; 1C 2C 3C 4C
; B A 012 012 012 012 1Y 2Y 3Y 4Y
-------------------------------------------------------------------------
L L LHH HHH HHH HHH L H H H 1C0 = 0
L L HHH LHH HHH HHH H L H H 2C0 = 0
L L HHH HHH LHH HHH H H L H 3C0 = 0
L L HHH HHH HHH LHH H H H L 4C0 = 0
L L HLL LLL LLL LLL H L L L 1C0 = 1
L L LLL HLL LLL LLL L H L L 2C0 = 1
L L LLL LLL HLL LLL L L H L 3C0 = 1
L L LLL LLL LLL HLL L L L H 4C0 = 1
L L HHH HHH HHH HHH H H H H TOGGLE LINES
L H HLH HHH HHH HHH L H H H 1C1 = 0
L H HHH HLH HHH HHH H L H H 2C1 = 0
L H HHH HHH HLH HHH H H L H 3C1 = 0
L H HHH HHH HHH HLH H H H L 4C1 = 0
L H LHL LLL LLL LLL H L L L 1C1 = 1
L H LLL LHL LLL LLL L H L L 2C1 = 1
L H LLL LLL LHL LLL L L H L 3C1 = 1
L H LLL LLL LLL LHL L L L H 4C1 = 1
L H HHH HHH HHH HHH H H H H TOGGLE LINES
H L HHL HHH HHH HHH L H H H 1C2 = 0
H L HHH HHL HHH HHH H L H H 2C2 = 0
H L HHH HHH HHL HHH H H L H 3C2 = 0
H L HHH HHH HHH HHL H H H L 4C2 = 0
H L LLH LLL LLL LLL H L L L 1C2 = 1
H L LLL LLH LLL LLL L H L L 2C2 = 1
H L LLL LLL LLH LLL L L H L 3C2 = 1
H L LLL LLL LLL LLH L L L H 4C2 = 1
H L HHH HHH HHH HHH H H H H TOGGLE LINES
-------------------------------------------------------------------------
DESCRIPTION
This is an example of a Quad 3-to-1 Multiplexer using a PAL16L6. Select
lines A,B are encoded in binary, with A representing the LSB.
OPERATIONS TABLE:
INPUT OUTPUTS
SELECT
B A Y
----------------
L L C0
L H C1
H L C2
----------------