Semiconductor integrated circuit comprising functional modes

• US 6,949,960 B2
• Filed: 08/06/2003
• Issued: 09/27/2005
• Est. Priority Date: 08/13/2002
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yang, Hyang-Ja, Kim, Hong-Kyun, Noh, Yong-Hwan, Park, Chul-Sung
• Primary Examiner(s): NGUYEN, MINH T
• Application Number:
  US10/635,253
• Publication Number:
  US 20040032915A1
• Time in Patent Office: 783 Days
• Field of Search: 327 47- 49, 327 44- 46, 377/28, 377/33, 377/51
• US Class Current: 327/47
• CPC Class Codes: G01R 31/31701 Arrangements for setting the Unit Under Test [UUT] in a test mode
• CPC Class Codes: G01R 31/3172 Optimisation aspects, e.g. using functional pin as test pin, pin multiplexing

Abstract

An integrated circuit device includes a pin for receiving a DC voltage component signal. The device includes a signal source for applying an AC signal to the pin, a buffer for converting the AC signal into a digital signal, and a digital detector for detecting a frequency of the digital signal and outputting a predetermined detection signal. The predetermined detection signal is activated when the frequency of the digital signal is greater than or equal to a predetermined frequency. The predetermined detection signal is used as a signal for setting predetermined functional modes. The device further includes registers or a differential amplifier and a decoder for generating a plurality of functional mode signals.

Claims

1. An integrated circuit device comprising:

a pin for receiving a direct current voltage-signal;

a signal source for applying an alternating current voltage-signal to the pin;

a buffer for converting the alternating current voltage-signal into a digital signal; and

a digital detector for detecting a frequency of the digital signal and outputting a predetermined detection signal,

wherein the predetermined detection signal is activated when the frequency, of the digital signal is greater than or equal to a predetermined frequency, and

wherein the digital detector comprises a transistor for attenuating a component of the digital signal having a predetermined logic level when the digital signal is oscillated at a frequency greater than or equal to the predetermined frequency.

2. The device of claim 1, wherein the predetermined detection signal is a signal for setting predetermined functional modes.

3. The device of claim 1, further comprising:

a register chain for generating successive transfer signals according to the digital signal in response to a clock signal; and

a decoder for generating functional mode signals according to transfer signals in response to the predetermined detection signal.

4. The device of the claim 3, wherein register chain comprises registers for generating the transfer signals.

5. The device of claim 3, wherein the decoder generates the functional mode signals through a logical combination of the transfer signals.

6. The device of claim 1, wherein the digital detector comprises a plurality of inverter stages responsive to a reference signal.

7. The device of claim 6, wherein each inverter stage comprises:

a PMOS transistor; and

an NMOS transistor coupled in series to the PMOS transistor, the NMOS transistor having a size smaller than a size of the PMOS transistor.

8. The device of claim 7, wherein a functional mode signal depends on the size of the NMOS transistor for pull-down.

9. The device of claim 1, wherein a functional mode signal is activated when the frequency of the digital signal is greater than a predetermined minimum frequency.

10. The device of claim 9, wherein the predetermined minimum frequency depends on a size of an NMOS transistor relative to a PMOS transistor in an inverter stage of the digital detector.

11. An integrated circuit device comprising a pin for receiving a direct current voltage-signal, the device comprising:

a signal source for applying an alternating current voltage-signal to the pin;

a buffer for converting the alternating current voltage-signal into a digital signal; and

a digital detector for detecting a frequency of the digital signal and outputting a predetermined detection signal;

a register chain for generating successive transfer signals according to the digital signal in response to a clock signal; and

a decoder for generating functional mode signals according to the transfer signals in response to the predetermined detection signal.

12. An integrated circuit device comprising a pin for receiving a direct current voltage-signal, the device comprising:

a signal source for applying an alternating current voltage-signal to the pin;

a buffer for converting the alternating current voltage-signal into a digital signal; and

a digital detector for detecting a frequency of the digital signal and outputting a predetermined detection signal, wherein the digital detector comprises a plurality of inverter stages responsive to a reference signal.

13. The device of claim 12, wherein each inverter stage comprises:

a PMOS transistor; and

an NMOS transistor coupled in series to the PMOS transistor, the NMOS transistor having a size smaller than a size of the PMOS transistor.

14. The device of claim 13, wherein a functional mode signal depends on the size of the NMOS transistor for pull-down.