Semiconductor device having variable parameter selection based on temperature and test method
First Claim
1. A method of testing a dynamic random-access memory (DRAM) device, the method comprising:
- measuring an output of a temperature-sensing circuit of the DRAM device, wherein the temperature-sensing circuit is configured to provide a first temperature indication, and wherein the temperature-sensing circuit includes a temperature threshold value and a hysteresis temperature value;
incrementally changing a temperature of the DRAM device until the output of the temperature-sensing circuit changes from a first state to a second state at a first temperature;
associating the temperature threshold value with the first temperature;
incrementally changing the temperature of the DRAM device until the output of the temperature-sensing circuit changes from the second state to a third state at a second temperature; and
associating the hysteresis temperature value with the second temperature.
5 Assignments
0 Petitions
Accused Products
Abstract
A semiconductor device that may include temperature sensing circuits is disclosed. The temperature sensing circuits may be used to control various parameters, such as internal regulated supply voltages, internal refresh frequency, or a word line low voltage. In this way, operating specifications of a semiconductor device at worst case temperatures may be met without compromising performance at normal operating temperatures. Each temperature sensing circuit may include a selectable temperature threshold value as well as a selectable temperature hysteresis value. In this way, temperature performance characteristics may be finely tuned. Furthermore, a method of testing the temperature sensing circuits is disclosed in which a current value may be monitored and temperature threshold values and temperature hysteresis values may be thereby determined.
97 Citations
31 Claims
-
1. A method of testing a dynamic random-access memory (DRAM) device, the method comprising:
-
measuring an output of a temperature-sensing circuit of the DRAM device, wherein the temperature-sensing circuit is configured to provide a first temperature indication, and wherein the temperature-sensing circuit includes a temperature threshold value and a hysteresis temperature value; incrementally changing a temperature of the DRAM device until the output of the temperature-sensing circuit changes from a first state to a second state at a first temperature; associating the temperature threshold value with the first temperature; incrementally changing the temperature of the DRAM device until the output of the temperature-sensing circuit changes from the second state to a third state at a second temperature; and associating the hysteresis temperature value with the second temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A method of testing a dynamic random-access memory (DRAM) device, the method comprising:
-
placing the DRAM device in a mode of operation; measuring a power consumption of the DRAM device, wherein the DRAM device includes a temperature-sensing circuit configured to provide a first temperature indication, and wherein the temperature-sensing circuit comprises a temperature threshold value and a hysteresis temperature value; incrementally changing a temperature of the DRAM device until the power consumption of the DRAM device changes from a first state to a second state at a first temperature; associating the temperature threshold value with the first temperature; incrementally changing the temperature of the DRAM device until the power consumption of the DRAM device changes from the second state to a third state at a second temperature; and associating the hysteresis temperature value with the second temperature. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
Specification