Multi-function circuit module having voltage level shifting function and data latching function

• US 7,511,556 B2
• Filed: 08/24/2007
• Issued: 03/31/2009
• Est. Priority Date: 08/24/2007
• Status: Active Grant

• Current Assignee: Ili Technology Corp. (MediaTek, Inc.)
• Original Assignee: Ili Technology Corp. (MediaTek, Inc.)
• Inventors: Huang, Chi-Mo, Chiang, Wei-Shan, Han, Chen-Hsien, Liu, Ming-Huang
• Primary Examiner(s): LE, DINH THANH
• Application Number:
  US11/844,358
• Publication Number:
  US 20090051402A1
• Time in Patent Office: 585 Days
• Field of Search: 326 62- 63, 326 80- 81, 327/306, 327/333
• US Class Current: 327/333
• CPC Class Codes: H03K 3/356139 with synchronous operation

Abstract

The present invention discloses a multi-function circuit module having voltage level shifting function and data latching function via switching a plurality of switch elements. The multi-function circuit module includes a first circuit module, a fourth switch element, and a fifth switch module, wherein the first circuit module further includes a first switch module, a second switch module, and a third switch module. The multi-function circuit module can substantially reduce the circuit layout area. For example, when the multi-function circuit module of the present invention is applied in a source driving chip circuit, the multi-function circuit module can replace the original low-to-high voltage level shifting circuit and data latching circuit, so as to attain the purpose of reducing the chip area.

Claims

1. A multi-function circuit module having voltage level shifting function and data latching function, the multi-function circuit module comprising:

a first circuit module, comprising;

a first switch module, for selectively coupling a first voltage source to a first node or a second node;

a second switch module, for selectively coupling a third node to the first node or the second node; and

a third switch module, for receiving at least an input signal and selectively coupling a fourth node to the first node or the second node;

a fourth switch module, coupled between the fourth node and a second voltage source, for receiving a first control signal and selectively conducting the fourth node and the second voltage source according to the first control signal, wherein when the fourth switch module conducts the fourth node and the second voltage source, the first switch module, the third switch module, and the fourth switch module act as a voltage level shifting circuit to respectively adjust voltage levels of the first node and/or the second node, so as to generate at least an output signal; and

a fifth switch module, coupled between the third node and the second voltage source, for receiving a second control signal and selectively conducting the third node and the second voltage source according to the second control signal, wherein when the fifth switch module conducts the third node and the second voltage source, the first switch module, the second switch module, and the fifth switch module act as a data latching circuit to latch the voltage levels of the first node and the second node.

2. The multi-function circuit module of claim 1, wherein the input signal comprises a first input signal and a second input signal being an inverse of the first input signal;

the first circuit module further comprises;

a first switch element, having a control terminal coupled to the first node, a first terminal coupled to the first voltage source, and a second terminal coupled to the second node; and

a second switch element, having a control terminal coupled to the second node, a first terminal coupled to the first voltage source, and a second terminal coupled to the first node;

the second switch module further comprises;

a third switch element, having a control terminal coupled to the first node, a first terminal coupled to the third node, and a second terminal coupled to the second node; and

a fourth switch element, having a control terminal coupled to the second node, a first terminal coupled to the third node, and a second terminal coupled to the first node;

the third switch module further comprises;

a fifth switch element, having a control terminal coupled to the first input signal, a first terminal coupled to the fourth node, and a second terminal coupled to the first node; and

a sixth switch element, having a control terminal coupled to the second input signal, a first terminal coupled to the fourth node, and a second terminal coupled to the second node;

the fourth switch module further comprises;

a seventh switch element, having a control terminal coupled to the first control signal, a first terminal coupled to the second voltage source, and a second terminal coupled to the fourth node; and

the fifth switch module further comprises;

an eighth switch element, having a control terminal coupled to the second control signal, a first terminal coupled to the second voltage source, and a second terminal coupled to the third node.

3. The multi-function circuit module of claim 2, wherein the first switch element, the second switch element, the third switch element, the fourth switch element, the fifth switch element, the sixth switch element, the seventh switch element, and the eighth switch element all are transistors.

4. The multi-function circuit module of claim 3, wherein the first switch element and the second switch element both are P-type FETs, and the third switch element, the fourth switch element, the fifth switch element, the sixth switch element, the seventh switch element, and the eighth switch element all are N-type FETs.

5. The multi-function circuit module of claim 3, wherein the first switch element, the second switch element, the seventh switch element, and the eighth switch element all are P-type FETs, and the third switch element, the fourth switch element, the fifth switch element, and the sixth switch element all are N-type FETs.

6. The multi-function circuit module of claim 3, wherein the first switch element, the second switch element, and the eighth switch element all are P-type FETs, and the third switch element, the fourth switch element, the fifth switch element, the sixth switch element, and the seventh switch element all are N-type FETs.

7. The multi-function circuit module of claim 2, further comprising:

a plurality of second circuit modules, each comprising;

a sixth switch module, for selectively coupling the first voltage source to a fifth node or a sixth node;

a seventh switch module, for selectively coupling the third node to the fifth node or the sixth node; and

an eighth switch module, for receiving the input signal and selectively coupling the fourth node to the fifth node or the sixth node.

8. The multi-function circuit module of claim 7, wherein when the fourth switch module conducts the fourth node and the second voltage source, the sixth switch module, the eighth switch module, and the fourth switch module act as the voltage level shifting circuit to respectively adjust voltage levels of the fifth node and/or the sixth node, so as to generate the output signal;

and when the sixth switch module conducts the third node and the second voltage source, the first switch module, the seventh switch module, and the fifth switch module act as the data latching circuit to latch the voltage levels of the fifth node and the sixth node.

9. The multi-function circuit module of claim 8, wherein the sixth circuit module further comprises:

a ninth switch element, having a control terminal coupled to the fifth node, a first terminal coupled to the first voltage source, and a second terminal coupled to the sixth node; and

a tenth switch element, having a control terminal coupled to the sixth node, a first terminal coupled to the first voltage source, and a second terminal coupled to the fifth node;

the seventh switch module further comprises;

an eleventh switch element, having a control terminal coupled to the fifth node, a first terminal coupled to the third node, and a second terminal coupled to the sixth node; and

a twelfth switch element, having a control terminal coupled to the sixth node, a first terminal coupled to the third node, and a second terminal coupled to the fifth node; and

the eighth switch module further comprises;

a thirteenth switch element, having a control terminal coupled to the first input signal, a first terminal coupled to the fourth node, and a second terminal coupled to the fifth node; and

a fourteenth switch element, having a control terminal coupled to the second input signal, a first terminal coupled to the fourth node, and a second terminal coupled to the sixth node.

10. The multi-function circuit module of claim 9, wherein the first switch element, the second switch element, the third switch element, the fourth switch element, the fifth switch element, the sixth switch element, the seventh switch element, the eighth switch element, the ninth switch element, the tenth switch element, the eleventh switch element, the twelfth switch element, the thirteenth switch element, and the fourteenth switch element all are transistors.

11. The multi-function circuit module of claim 10, wherein the first switch element and the second switch element, the ninth switch element, and the tenth switch element all are P-type FETs, and the third switch element, the fourth switch element, the fifth switch element, the sixth switch element, the seventh switch element, the eighth switch element, the eleventh switch element, the twelfth switch element, the thirteenth switch element, and the fourteenth switch element all are N-type FETs.

12. The multi-function circuit module of claim 10, wherein the first switch element, the second switch element, the seventh switch element, the eighth switch element, the ninth switch element, and the tenth switch element all are P-type FETs, and the third switch element, the fourth switch element, the fifth switch element, the sixth switch element, the eleventh switch element, the twelfth switch element, the thirteenth switch element, and the fourteenth switch element all are N-type FETs.

13. The multi-function circuit module of claim 10, wherein the first switch element, the second switch element, the eighth switch element, the ninth switch element, and the tenth switch element all are P-type FETs, and the third switch element, the fourth switch element, the fifth switch element, the sixth switch element, the seventh switch element, the eleventh switch element, the twelfth switch element, the thirteenth switch element, and the fourteenth switch element all are N-type FETs.

14. The multi-function circuit module of claim 1, further comprising:

a control circuit, for generating the first control signal and the second control signal, wherein when the input signal inputs a data, the control circuit firstly sets the first control signal to conduct the fourth switch module and sets the second control signal to not conduct the fifth switch module simultaneously for respectively adjusting the voltage levels of the first node and/or the second node, so as to generate the output signal; and

after the multi-function circuit module has completely received the data, the control circuit then sets the second control signal to conduct the fifth switch module and sets the first control signal to not conduct the fourth switch module simultaneously to latch the voltage levels of the first node and/or the second node corresponding to the data.

15. The multi-function circuit module of claim 1, wherein the voltage level shifting circuit is a voltage level pull-up circuit, and the voltage level of the first voltage source is higher than the voltage level of the second voltage source.

16. The multi-function circuit module of claim 8, wherein the voltage level shifting circuit is a voltage level pull-up circuit, and the voltage level of the first voltage source is higher than the voltage level of the second voltage source.

17. The multi-function circuit module of claim 1, applied in a source driving chip circuit configured for driving an LCD device.

18. The multi-function circuit module of claim 8, applied in a source driving chip circuit configured for driving an LCD device.