Electronic digital logic circuitry – Interface – Logic level shifting
Patent
1993-10-28
1995-01-10
Westin, Edward P.
Electronic digital logic circuitry
Interface
Logic level shifting
326 21, 326121, 327546, H03K 190185, H03K 190948
Patent
active
053810627
ABSTRACT:
An integrated circuit is disclosed comprising a first field effect transistor having a source connected to a first node and a gate connected to a second node, and a second field effect transistor for protecting the first transistor from voltages applied to the first node and greater than a predetermined nominal voltage. The second transistor includes a drain connected to the second node, a source connected to the first node, and a gate connected to a third node. A constant voltage source is coupled to the third node and supplies a gate voltage to the gate of the second transistor such that a drain-source path of the second transistor does not conduct while voltage applied to the first node is generally less than the gate voltage plus a threshold voltage of the second transistor. The constant voltage source comprises a third field effect transistor having a drain and a gate connected to the third node, and a source coupled to a first power supply voltage, such that the gate voltage is substantially equal to the first power supply voltage minus a threshold voltage of the third transistor.
REFERENCES:
patent: 4704547 (1987-11-01), Kirsch et al.
patent: 4963766 (1990-10-01), Lundberg
patent: 5004936 (1991-04-01), Andresen
patent: 5278460 (1994-01-01), Casper
patent: 5300832 (1994-04-01), Rogers
Takahashi et al., 3.3V-5V Compatible I/O Circuit without Thick Gate Oxide, IEEE 1992 Custom Integrated Circuits Conference, pp. 23.3.1-23.3.4, May 1992.
AT&T Corp.
Santamauro Jon
Westin Edward P.
LandOfFree
Multi-voltage compatible bidirectional buffer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multi-voltage compatible bidirectional buffer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-voltage compatible bidirectional buffer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-853373