diff --git a/library/74xx.dcm b/library/74xx.dcm
index 4719a53d..aec7fc1a 100644
--- a/library/74xx.dcm
+++ b/library/74xx.dcm
@@ -680,8 +680,9 @@ K TTL DECOD DECOD7 OpenCol
 $ENDCMP
 #
 $CMP 74LS51
-D Dual And-Nor ( S =/(AB+CD) )
+D Dual 3- and 2-input AND-NOR ( S = /(AB[C] + DE[F]) )
 K TTL ANDNOR
+F http://www.ti.com/lit/ds/symlink/sn74ls51.pdf
 $ENDCMP
 #
 $CMP 74LS54
diff --git a/library/74xx.lib b/library/74xx.lib
index 55de4f56..ef982873 100644
--- a/library/74xx.lib
+++ b/library/74xx.lib
@@ -3636,34 +3636,37 @@ ENDDEF
 # 74LS51
 #
 DEF 74LS51 U 0 10 Y Y 2 F N
-F0 "U" 150 100 60 H V C CNN
-F1 "74LS51" 250 -100 60 H V C CNN
+F0 "U" 200 200 50 H V C CNN
+F1 "74LS51" 250 -200 50 H V C CNN
 F2 "" 0 0 60 H V C CNN
 F3 "" 0 0 60 H V C CNN
+$FPLIST
+ DIP-14*
+$ENDFPLIST
 DRAW
-X GND 7 -100 -170 0 R 60 60 0 0 W N
-X VCC 14 -100 170 0 R 60 60 0 0 W N
-A -52 -100 70 882 -882 0 1 0 N -50 -30 -50 -169
-A -50 100 70 882 -882 0 1 0 N -48 170 -48 31
-A 17 1 59 559 -569 0 1 0 N 50 50 49 -47
-A 74 32 82 -229 -892 0 1 0 N 150 1 75 -49
-A 75 -31 81 223 893 0 1 0 N 150 0 76 50
-P 2 0 1 0  75 -50  50 -50 N
-P 2 0 1 0  75 50  50 50 N
-P 4 0 1 0  -50 -30  -150 -30  -150 -170  -50 -170 N
-P 4 0 1 0  -50 170  -150 170  -150 30  -50 30 N
-P 4 0 1 0  20 -100  35 -100  35 -25  70 -25 N
-P 4 0 1 0  20 100  35 100  35 25  70 25 N
-X ~ 2 -450 150 300 R 60 60 1 1 I
-X ~ 3 -450 50 300 R 60 60 1 1 I
-X ~ 4 -450 -50 300 R 60 60 1 1 I
-X ~ 5 -450 -150 300 R 60 60 1 1 I
-X ~ 6 450 0 300 L 60 60 1 1 O I
-X ~ 1 -450 150 300 R 60 60 2 1 I
-X ~ 9 450 0 300 L 60 60 2 1 O I
-X ~ 10 -450 50 300 R 60 60 2 1 I
-X ~ 12 -450 -50 300 R 60 60 2 1 I
-X ~ 13 -450 -150 300 R 60 60 2 1 I
+X GND 7 -50 -275 0 U 50 50 0 0 W N
+X VCC 14 -50 275 0 D 50 50 0 0 W N
+A -50 -150 125 -899 899 0 1 0 N -50 -275 -50 -25
+A -50 150 125 -899 899 0 1 0 N -50 25 -50 275
+A 75 0 146 -590 590 0 1 0 N 150 -125 150 125
+A 170 -148 274 941 327 0 1 0 N 150 125 400 0
+A 170 148 274 -941 -327 0 1 0 N 150 -125 400 0
+P 4 0 1 0  -50 -25  -150 -25  -150 -275  -50 -275 N
+P 4 0 1 0  -50 25  -150 25  -150 275  -50 275 N
+P 4 0 1 0  75 -150  125 -150  125 -75  200 -75 N
+P 4 0 1 0  75 150  125 150  125 75  200 75 N
+X ~ 1 -300 250 150 R 50 50 1 1 I
+X ~ 8 600 0 200 L 50 50 1 1 O I
+X ~ 9 -300 -50 150 R 50 50 1 1 I
+X ~ 10 -300 -150 150 R 50 50 1 1 I
+X ~ 11 -300 -250 150 R 50 50 1 1 I
+X ~ 12 -300 150 150 R 50 50 1 1 I
+X ~ 13 -300 50 150 R 50 50 1 1 I
+X ~ 2 -300 250 150 R 50 50 2 1 I
+X ~ 3 -300 50 150 R 50 50 2 1 I
+X ~ 4 -300 -50 150 R 50 50 2 1 I
+X ~ 5 -300 -250 150 R 50 50 2 1 I
+X ~ 6 600 0 200 L 50 50 2 1 O I
 ENDDRAW
 ENDDEF
 #