公开(公告)号：GB2313968A

公开(公告)日：1997-12-10

申请号：GB9710966

申请日：1997-05-28

Applicant: ALTERA CORP

Inventor： WONG WILSON ,  PATEL RAKESH H ,  TURNER JOHN E ,  LAM JOHN D

IPC: H01L27/04 ,  G11C5/14 ,  H01L21/822 ,  H03K19/00 ,  H03K19/003 ,  H03K19/0175 ,  H03K19/0185

Abstract: The core of an IC may be supplied with a reduced voltage by an internal voltage dropping circuit VDC, while the input and output circuits remain compatible with circuits supplied with an unreduced voltage. Alternatively, the IC may be supplied with reduced voltage, and the input can be configured to accept signals from circuits supplied with the reduced voltage (figure 4), or from circuits supplied with the unreduced voltage (figure 5). When the IC is supplied with reduced voltage, an output driver (figure 9a) may be protected against leakage currents by applying a boosted voltage, e.g. from a voltage pump, to some driver nodes. The same IC design may be used in different operating modes depending on the option selected by metal masks, by fuses, or by EEPROM, EPROM, or SRAM cells.

公开(公告)号：GB2349998A

公开(公告)日：2000-11-15

申请号：GB0020337

申请日：1997-05-28

Applicant: ALTERA CORP

Inventor： PATEL RAKESH H ,  TURNER JOHN E ,  LAM JOHN D ,  WONG WILSON

IPC: H03K19/00 ,  H03K19/003 ,  H03K19/0185

Abstract: An output circuit for a programmable circuit with a low voltage core 1310 comprises a level converter 1317 powered from a quiet supply 1335 and feeding an output driver 1323 which is supplied by a noisy supply 1338. The core 1310 is supplied from the quiet supply via a voltage supply down converter 1330 comprising an NMOS transistor 1335 and a CMOS inverting feedback amplifier 1360.

公开(公告)号：GB2313968B

公开(公告)日：2001-01-03

申请号：GB9710966

申请日：1997-05-28

Applicant: ALTERA CORP

Inventor： WONG WILSON ,  PATEL RAKESH H ,  TURNER JOHN E ,  LAM JOHN D

IPC: H01L27/04 ,  G11C5/14 ,  H01L21/822 ,  H03K19/00 ,  H03K19/003 ,  H03K19/0175 ,  H03K19/0185

Abstract: A technique provides an on-chip voltage to a core portion of an integrated circuit by way of a conversion transistor. The on-chip voltage may be a reduced internal voltage, less than the VCC of the integrated circuit. In an embodiment, the layout (or physical structure) of the conversion transistor is distributed surrounding the core portion. By providing the core with a reduced voltage, the integrated circuit may interface with other integrated circuits compatible with different voltage levels.

公开(公告)号：GB2349998B

公开(公告)日：2001-02-28

申请号：GB0020337

申请日：1997-05-28

Applicant: ALTERA CORP

Inventor： PATEL RAKESH H ,  TURNER JOHN E ,  LAM JOHN D ,  WONG WILSON

IPC: H03K19/00 ,  H03K19/003 ,  H03K19/0185

公开(公告)号：GB2349999B

公开(公告)日：2001-01-31

申请号：GB0020344

申请日：1997-05-28

Applicant: ALTERA CORP

Inventor： PATEL RAKESH H ,  TURNER JOHN E ,  LAM JOHN D ,  WONG WILSON

IPC: H03K19/00 ,  H03K19/003 ,  H03K19/0185

公开(公告)号：GB2349999A

公开(公告)日：2000-11-15

申请号：GB0020344

申请日：1997-05-28

Applicant: ALTERA CORP

Inventor： PATEL RAKESH H ,  TURNER JOHN E ,  LAM JOHN D ,  WONG WILSON

IPC: H03K19/00 ,  H03K19/003 ,  H03K19/0185

Abstract: Reverse conduction through the PMOS pull-up device MP3 is prevented by providing a 5 volt gate potential when MP3 is off. Conduction through the substrate of MP3 is prevented by connecting the substrate to the 5 volt supply instead of to the source of MP3. The output driver may be used in a programmable logic circuit with a logic core operating at 3 volts. The 5 volt supply may be generated on-chip by a voltage pump.