diff --git a/src/ng/directive/input.js b/src/ng/directive/input.js
index 40b29b236900..f672e571c098 100644
--- a/src/ng/directive/input.js
+++ b/src/ng/directive/input.js
@@ -82,8 +82,8 @@ var inputType = {
    *
    * @param {string} ngModel Assignable angular expression to data-bind to.
    * @param {string=} name Property name of the form under which the control is published.
-   * @param {string=} min Sets the `min` validation error key if the value entered is less then `min`.
-   * @param {string=} max Sets the `max` validation error key if the value entered is greater then `min`.
+   * @param {expression} min Sets the `min` validation error key if the value entered is less then `min`.
+   * @param {expression} max Sets the `max` validation error key if the value entered is greater then `max`.
    * @param {string=} required Sets `required` validation error key if the value is not entered.
    * @param {number=} ngMinlength Sets `minlength` validation error key if the value is shorter than
    *    minlength.
@@ -498,38 +498,31 @@ function numberInputType(scope, element, attr, ctrl, $sniffer, $browser) {
     return isEmpty(value) ? '' : '' + value;
   });
 
-  if (attr.min) {
-    var min = parseFloat(attr.min);
-    var minValidator = function(value) {
-      if (!isEmpty(value) && value < min) {
-        ctrl.$setValidity('min', false);
-        return undefined;
-      } else {
-        ctrl.$setValidity('min', true);
-        return value;
-      }
-    };
-
-    ctrl.$parsers.push(minValidator);
-    ctrl.$formatters.push(minValidator);
-  }
+  function applyMinMax(minOrMax, notInRange) {
+    if (attr.hasOwnProperty(minOrMax)) {
+      var validator = function(value) {
+        var parsedValue = parseFloat(attr[minOrMax]);
+        if (!isEmpty(value) && notInRange(value, parsedValue)) {
+          ctrl.$setValidity(minOrMax, false);
+          return undefined;
+        } else {
+          ctrl.$setValidity(minOrMax, true);
+          return value;
+        }
+      };
 
-  if (attr.max) {
-    var max = parseFloat(attr.max);
-    var maxValidator = function(value) {
-      if (!isEmpty(value) && value > max) {
-        ctrl.$setValidity('max', false);
-        return undefined;
-      } else {
-        ctrl.$setValidity('max', true);
-        return value;
-      }
-    };
+      ctrl.$parsers.push(validator);
+      ctrl.$formatters.push(validator);
 
-    ctrl.$parsers.push(maxValidator);
-    ctrl.$formatters.push(maxValidator);
+      attr.$observe(minOrMax, function() {
+        // triggering validation
+        ctrl.$setViewValue(ctrl.$viewValue);
+      });
+    }
   }
-
+  applyMinMax('min', function notInRange(value, min) {return value < min});
+  applyMinMax('max', function notInRange(value, max) {return value > max});
+  
   ctrl.$formatters.push(function(value) {
 
     if (isEmpty(value) || isNumber(value)) {
diff --git a/test/ng/directive/inputSpec.js b/test/ng/directive/inputSpec.js
index 3b511011d1a6..41a9c1980b9e 100644
--- a/test/ng/directive/inputSpec.js
+++ b/test/ng/directive/inputSpec.js
@@ -592,7 +592,10 @@ describe('input', function() {
     describe('min', function() {
 
       it('should validate', function() {
-        compileInput('<input type="number" ng-model="value" name="alias" min="10" />');
+        scope.$apply(function() {
+          scope.min = 10;
+        });
+        compileInput('<input type="number" ng-model="value" name="alias" min="{{min}}" />');
         scope.$digest();
 
         changeInputValueTo('1');
@@ -604,6 +607,15 @@ describe('input', function() {
         expect(inputElm).toBeValid();
         expect(scope.value).toBe(100);
         expect(scope.form.alias.$error.min).toBeFalsy();
+        
+        scope.$apply(function() {
+          scope.min = 200;
+        });
+        expect(inputElm.val()).toBe('100');
+        expect(inputElm).toBeInvalid();
+        expect(scope.value).toBeFalsy();
+        expect(scope.form.alias.$error.min).toBeTruthy();
+        
       });
     });
 
@@ -611,7 +623,8 @@ describe('input', function() {
     describe('max', function() {
 
       it('should validate', function() {
-        compileInput('<input type="number" ng-model="value" name="alias" max="10" />');
+        scope.max = 10;
+        compileInput('<input type="number" ng-model="value" name="alias" max="{{max}}" />');
         scope.$digest();
 
         changeInputValueTo('20');