Global patent index - EP 1057262 A1

EP 1057262 A1 2000-12-06 - OVERVOLTAGE-PROTECTED I/O BUFFER

Title (en)

OVERVOLTAGE-PROTECTED I/O BUFFER

Title (de)

GEGEN ÜBERSPANNUNGEN GESCHÜTZTER EINGANGS/AUSGANGPUFFER

Title (fr)

TAMPON E/S PROTEGE CONTRE LES SURTENSIONS

Publication

EP 1057262 A1 (EN)

Application

EP 99961033 A

Priority

  • EP 99961033 A
  • EP 9909357 W
  • EP 98204343 A

Abstract (en)

[origin: WO0038322A1] A tristate I/O buffer (101) suitable for cooperation with modules (31) which operate at a higher supply voltage than the supply voltage of the buffer (101). The output (4) of the buffer (101) is provided with an overvoltage protection circuit (110) which prevents current leakage from the output (4) to the supply voltage line (VDD) of the buffer (101). The overvoltage protection circuit (110) comprises a PMOS blocking transistor (120), a first PMOS control transistor (130) and a second NMOS control transistor (140). The two control transistors (130, 140) are controlled by a control signal which is derived solely from the enable signal (E).

IPC 1-7 (main, further and additional classification)

H03K 19/003

IPC 8 full level (invention and additional information)

H01L 27/04 (2006.01); H01L 21/822 (2006.01); H01L 21/8238 (2006.01); H01L 27/092 (2006.01); H03K 19/003 (2006.01); H03K 19/0175 (2006.01)

CPC (invention and additional information)

H03K 19/00315 (2013.01)

Citation (search report)

See references of WO 0038322A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 0038322 A1 20000629; EP 1057262 A1 20001206; JP 2002533971 A 20021008

INPADOC legal status

2002-02-27 [18W] WITHDRAWN

- Ref Legal Event Code: 18W

- Date of withdrawal: 20011221

2001-03-07 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20001229

2000-12-06 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE