PAL20L10                                      PAL DESIGN SPECIFICATION
P7070                                            VINCENT COLI 10/21/81
10-BIT OPEN COLLECTOR BUFFER
MMI SUNNYVALE, CALIFORNIA
/OC1 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 GND
/OC2 Y9 Y8 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 VCC

IF(OC1*/D0)  /Y0 = VCC                 ;Y0= D0 (TRUE)

IF(OC1*/D1)  /Y1 = VCC                 ;Y1= D1 (TRUE)

IF(OC1*/D2)  /Y2 = VCC                 ;Y2= D2 (TRUE)

IF(OC1*/D3)  /Y3 = VCC                 ;Y3= D3 (TRUE)

IF(OC1*/D4)  /Y4 = VCC                 ;Y4= D4 (TRUE)

IF(OC2*/D5)  /Y5 = VCC                 ;Y5= D5 (TRUE)

IF(OC2*/D6)  /Y6 = VCC                 ;Y6= D6 (TRUE)

IF(OC2*/D7)  /Y7 = VCC                 ;Y7= D7 (TRUE)

IF(OC2*/D8)  /Y8 = VCC                 ;Y8= D8 (TRUE)

IF(OC2*/D9)  /Y9 = VCC                 ;Y9= D9 (TRUE)

FUNCTION TABLE
/OC2 /OC1 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Y9 Y8 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0

;       INPUT DATA    OUTPUT DATA
;/OC    DDDDDDDDDD    YYYYYYYYYY
;2 1    9876543210    9876543210      COMMENTS
----------------------------------------------------------------------
 L L    LLLLLLLLLL    LLLLLLLLLL      TEST L's (TRUE D)
 L L    HHHHHHHHHH    ZZZZZZZZZZ      TEST H's (TRUE D)
 L L    HLHLHLHLHL    ZLZLZLZLZL      TEST EVEN CHECKERBOARD (TRUE D)
 L L    LHLHLHLHLH    LZLZLZLZLZ      TEST ODD  CHECKERBOARD (TRUE D)
 H L    XXXXXLLLLL    ZZZZZLLLLL      TEST HI-Z FOR /OC2=H
 L H    LLLLLXXXXX    LLLLLZZZZZ      TEST HI-Z FOR /OC1=H
----------------------------------------------------------------------

DESCRIPTION
THE 10-BIT OPEN COLLECTOR BUFFER WILL OUTPUT THE INPUT DATA (D).  THE 
OUTPUTS (Y) WILL BE EITHER L OR HI-Z.

CERTAIN OUTPUTS WILL BE HIGH-Z (Y=Z) IF EITHER OUTPUT CONTROL LINE IS HIGH
(/OC=H) REGARDLESS OF OTHER INPUTS.  NOTE THAT OC2 CONTROLS OUTPUTS Y9-Y5
AND OC1 CONTROLS OUTPUTS Y4-Y0.  OC2 AND OC1 CONTROL INDEPENDENTLY.

OPERATIONS TABLE:

     /OC2  /OC1  D9-D0  Y9-Y5  Y4-Y0    OPERATION
     -----------------------------------------------------------
       H     X     X      Z      X      HI-Z FOR UPPER 5 BITS
       X     H     X      X      Z      HI-Z FOR LOWER 5 BITS
       L     L     D      D      D      OUTPUT TRUE (L or HI-Z)
     -----------------------------------------------------------