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1991-01-12
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4KB
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91 lines
PAL18L4 PAL DESIGN SPECIFICATION
74LS453 BIRKNER/KAZMI/BLASCO 03/10/81
QUAD 4:1 MULTIPLEXER
MMI SUNNYVALE, CALIFORNIA
1C0 1C1 1C2 1C3 2C0 2C1 2C2 2C3 3C0 3C1 3C2 GND
3C3 4C0 4C1 4C2 4Y 3Y 2Y 1Y 4C3 B A VCC
;equations go here
/1Y = /B*/A * /1C0 ;SELECT INPUT 1C0
+ /B* A * /1C1 ;SELECT INPUT 1C1
+ B*/A * /1C2 ;SELECT INPUT 1C2
+ B* A * /1C3 ;SELECT INPUT 1C3
/2Y = /B*/A * /2C0 ;SELECT INPUT 2C0
+ /B* A * /2C1 ;SELECT INPUT 2C1
+ B*/A * /2C2 ;SELECT INPUT 2C2
+ B* A * /2C3 ;SELECT INPUT 2C3
/3Y = /B*/A * /3C0 ;SELECT INPUT 3C0
+ /B* A * /3C1 ;SELECT INPUT 3C1
+ B*/A * /3C2 ;SELECT INPUT 3C2
+ B* A * /3C3 ;SELECT INPUT 3C3
/4Y = /B*/A * /4C0 ;SELECT INPUT 4C0
+ /B* A * /4C1 ;SELECT INPUT 4C1
+ B*/A * /4C2 ;SELECT INPUT 4C2
+ B* A * /4C3 ;SELECT INPUT 4C3
FUNCTION TABLE
B A 1C0 1C1 1C2 1C3 2C0 2C1 2C2 2C3 3C0 3C1 3C2 3C3 4C0 4C1 4C2 4C3 1Y 2Y 3Y 4Y
; SEL --------INPUTS-------- --OUTPUTS-- COMMENTS
; 1C 2C 3C 4C
; B A 0123 0123 0123 0123 1Y 2Y 3Y 4Y
-------------------------------------------------------------------------
L L LHHH HHHH HHHH HHHH L H H H 1C0 = 0
L L HHHH LHHH HHHH HHHH H L H H 2C0 = 0
L L HHHH HHHH LHHH HHHH H H L H 3C0 = 0
L L HHHH HHHH HHHH LHHH H H H L 4C0 = 0
L L HLLL LLLL LLLL LLLL H L L L 1C0 = 1
L L LLLL HLLL LLLL LLLL L H L L 2C0 = 1
L L LLLL LLLL HLLL LLLL L L H L 3C0 = 1
L L LLLL LLLL LLLL HLLL L L L H 4C0 = 1
L L HHHH HHHH HHHH HHHH H H H H TOGGLE LINES
L H HLHH HHHH HHHH HHHH L H H H 1C1 = 0
L H HHHH HLHH HHHH HHHH H L H H 2C1 = 0
L H HHHH HHHH HLHH HHHH H H L H 3C1 = 0
L H HHHH HHHH HHHH HLHH H H H L 4C1 = 0
L H LHLL LLLL LLLL LLLL H L L L 1C1 = 1
L H LLLL LHLL LLLL LLLL L H L L 2C1 = 1
L H LLLL LLLL LHLL LLLL L L H L 3C1 = 1
L H LLLL LLLL LLLL LHLL L L L H 4C1 = 1
L H HHHH HHHH HHHH HHHH H H H H TOGGLE LINES
H L HHLH HHHH HHHH HHHH L H H H 1C2 = 0
H L HHHH HHLH HHHH HHHH H L H H 2C2 = 0
H L HHHH HHHH HHLH HHHH H H L H 3C2 = 0
H L HHHH HHHH HHHH HHLH H H H L 4C2 = 0
H L LLHL LLLL LLLL LLLL H L L L 1C2 = 1
H L LLLL LLHL LLLL LLLL L H L L 2C2 = 1
H L LLLL LLLL LLHL LLLL L L H L 3C2 = 1
H L LLLL LLLL LLLL LLHL L L L H 4C2 = 1
H L HHHH HHHH HHHH HHHH H H H H TOGGLE LINES
H H HHHL HHHH HHHH HHHH L H H H 1C3 = 0
H H HHHH HHHL HHHH HHHH H L H H 2C3 = 0
H H HHHH HHHH HHHL HHHH H H L H 3C3 = 0
H H HHHH HHHH HHHH HHHL H H H L 4C3 = 0
H H LLLH LLLL LLLL LLLL H L L L 1C3 = 1
H H LLLL LLLH LLLL LLLL L H L L 2C3 = 1
H H LLLL LLLL LLLH LLLL L L H L 3C3 = 1
H H LLLL LLLL LLLL LLLH L L L H 4C3 = 1
H H HHHH HHHH HHHH HHHH H H H H TOGGLE LINES
-------------------------------------------------------------------------
DESCRIPTION
This is an example of a Quad 4-to-1 Multiplexer using a PAL18L4. 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
H H C3
----------------