diff --git a/include/sta/Liberty.hh b/include/sta/Liberty.hh
index b9402f2c..fd8868ec 100644
--- a/include/sta/Liberty.hh
+++ b/include/sta/Liberty.hh
@@ -764,6 +764,8 @@ public:
   // Is the clock for timing checks.
   bool isCheckClk() const { return is_check_clk_; }
   void setIsCheckClk(bool is_clk);
+  bool isPad() const { return is_pad_; }
+  void setIsPad(bool is_pad);
   RiseFall *pulseClkTrigger() const { return pulse_clk_trigger_; }
   // Rise for high, fall for low.
   RiseFall *pulseClkSense() const { return pulse_clk_sense_; }
@@ -863,6 +865,7 @@ protected:
   bool level_shifter_data_:1;
   bool is_switch_:1;
   bool is_disabled_constraint_:1;
+  bool is_pad_:1;
 
 private:
   friend class LibertyLibrary;
diff --git a/liberty/Liberty.cc b/liberty/Liberty.cc
index 4208f3ee..a6864052 100644
--- a/liberty/Liberty.cc
+++ b/liberty/Liberty.cc
@@ -1996,7 +1996,8 @@ LibertyPort::LibertyPort(LibertyCell *cell,
   isolation_cell_enable_(false),
   level_shifter_data_(false),
   is_switch_(false),
-  is_disabled_constraint_(false)
+  is_disabled_constraint_(false),
+  is_pad_(false)
 {
   liberty_port_ = this;
   min_pulse_width_[RiseFall::riseIndex()] = 0.0;
diff --git a/liberty/LibertyReader.cc b/liberty/LibertyReader.cc
index a9dbced1..fb23fe3e 100644
--- a/liberty/LibertyReader.cc
+++ b/liberty/LibertyReader.cc
@@ -297,6 +297,7 @@ LibertyReader::defineVisitors()
   defineAttrVisitor("dont_use", &LibertyReader::visitDontUse);
   defineAttrVisitor("is_macro_cell", &LibertyReader::visitIsMacro);
   defineAttrVisitor("is_memory", &LibertyReader::visitIsMemory);
+  defineAttrVisitor("pad_cell", &LibertyReader::visitIsPadCell);
   defineAttrVisitor("is_pad", &LibertyReader::visitIsPad);
   defineAttrVisitor("is_clock_cell", &LibertyReader::visitIsClockCell);
   defineAttrVisitor("is_level_shifter", &LibertyReader::visitIsLevelShifter);
@@ -2887,13 +2888,13 @@ LibertyReader::visitIsMemory(LibertyAttr *attr)
 }
 
 void
-LibertyReader::visitIsPad(LibertyAttr *attr)
+LibertyReader::visitIsPadCell(LibertyAttr *attr)
 {
   if (cell_) {
-    bool is_pad, exists;
-    getAttrBool(attr, is_pad, exists);
+    bool pad_cell, exists;
+    getAttrBool(attr, pad_cell, exists);
     if (exists)
-      cell_->setIsPad(is_pad);
+      cell_->setIsPad(pad_cell);
   }
 }
 
@@ -3358,6 +3359,19 @@ LibertyReader::visitClock(LibertyAttr *attr)
   }
 }
 
+void
+LibertyReader::visitIsPad(LibertyAttr *attr)
+{
+  if (ports_) {
+    bool is_pad, exists;
+    getAttrBool(attr, is_pad, exists);
+    if (exists) {
+      for (LibertyPort *port : *ports_)
+        port->setIsPad(is_pad);
+    }
+  }
+}
+
 void
 LibertyReader::visitCapacitance(LibertyAttr *attr)
 {
diff --git a/liberty/LibertyReaderPvt.hh b/liberty/LibertyReaderPvt.hh
index 5eee6cb1..5fc608a6 100644
--- a/liberty/LibertyReaderPvt.hh
+++ b/liberty/LibertyReaderPvt.hh
@@ -187,6 +187,7 @@ public:
   virtual void visitDontUse(LibertyAttr *attr);
   virtual void visitIsMacro(LibertyAttr *attr);
   virtual void visitIsMemory(LibertyAttr *attr);
+  virtual void visitIsPadCell(LibertyAttr *attr);
   virtual void visitIsPad(LibertyAttr *attr);
   virtual void visitIsClockCell(LibertyAttr *attr);
   virtual void visitIsLevelShifter(LibertyAttr *attr);