摘要:
A CAM cell including three-transistor (3T) or four-transistor (4T) DRAM cells. Data is stored using intrinsic capacitance of each 3T or 4T DRAM cell, and is applied to the gate terminal of a pull-down transistor. Read operations are performed in the 3T and 4T DRAM cells without disturbing the stored data value by applying the stored data value to the gate terminal of a pull-down transistor and detecting the operating state (i.e., turned on or turned off) of a pull-down transistor, thereby avoiding the charge sharing problems associated with 1T DRAM cells.
摘要:
An integrated circuit having an electrostatic discharge (ESD) protection circuit, a core protection circuit, a sensitive core circuit and peripheral circuitry is provided. The ESD protection circuit is coupled between the VDD voltage supply terminal and the VSS voltage supply terminal, and is capable of providing protection to the peripheral circuitry. The ESD protection circuitry requires help from core protection circuit to protect the sensitive core circuit. The core protection circuit and the sensitive core circuit are coupled in series between the VDD and VSS voltage supply terminals, with the core protection circuit coupled to the VDD voltage supply terminal. The sensitive core circuit has a VCC voltage supply terminal coupled to receive a VCC supply voltage from the core protection circuit. The core protection circuit is configured to cause the VCC supply voltage to rise slowly with respect to a rising voltage on the VDD voltage supply terminal during power-on of the integrated circuit. The core protection circuit is further configured to disconnect the VCC voltage supply terminal from the VDD voltage supply when a voltage on the VDD voltage supply terminal exceeds the nominal VDD supply voltage by a predetermined amount.
摘要:
A process and system for estimating the occurrence of single event latch-up in an integrated circuit. The process involves determining the resistance between each junction and the closest appropriate tap in a regular shaped well. Each junction occurring in an irregular-shaped well is also identified. Finally, the method may make suggestions for lowering the probability that single event latch-up may occur in the integrated circuit.
摘要:
A process and system for estimating the occurrence of single event latch-up in an integrated circuit. The process involves determining the resistance between each junction and the closest appropriate tap in a regular shaped well. Each junction occurring in an irregular-shaped well is also identified. Finally, the method may make suggestions for lowering the probability that single event latch-up may occur in the integrated circuit.
摘要:
In a buffer circuit a pull-up circuit causes an output terminal of the buffer circuit make a transition from a low voltage to a high, and a feedback circuit increases the rate of the transition during the part of the transition when the output terminal moves from the low voltage to a predesignated voltage, the predesignated voltage being a value between but different from the low and high voltages. In another buffer circuit powered by a power supply voltage, a pull-up transistor causes a signal at an output terminal of the buffer circuit make a transition from a low voltage to a high voltage, and a converter circuit converts the power supply voltage to a lower voltage, the lower voltage powering the pull-up transistor.
摘要:
A system and method are provided for electrostatic discharge (ESD) protection circuit having overshoot and undershoot voltage protection during a power supply ramp-up of the circuit. In a specific embodiment, the ESD protection circuit of the present invention includes an ESD discharge circuit coupled between a power supply node and a ground supply node, a trigger circuit coupled to the ESD discharge circuit, the trigger circuit to turn the ESD discharge circuit on in the presence of a voltage spike during the power supply ramp-up and to turn the ESD discharge circuit off in the absence of a voltage spike during the power supply ramp-up, and a delay circuit coupled between the discharge circuit and the trigger circuit, the delay circuit to slow down the turn-off of the discharge circuit to prevent an overshoot or undershoot voltage condition during the power supply ramp-up of the circuit.
摘要:
Circuits are disclosed for protecting internal circuitry of a semiconductor chip from increased power supply voltages due to electrostatic discharge (EDS). One example circuit includes a trigger circuit including a transistor and a capacitor arranged in series between DC pads. The trigger circuit generates a trigger signal to a discharge circuit connected between the DC pads to shunt charge from one of the DC pads to the other. The RC delay associated with the transistor and capacitor of the trigger circuit may be designed such that the trigger circuit generates the trigger signal in response to an ESD event, but not in response to high positive spikes on one of the DC pads during normal operation.
摘要:
An integrated circuit structure that includes a patterned uppermost conductive layer having a current-carrying trace. The current-carrying trace is connected to an underlying substrate by a multi-layer interconnect structure. The current-carrying trace, which is located around the outer edges of the integrated circuit structure, has at least one edge exhibiting a serpentine pattern. A topside film is located over the patterned uppermost conductive layer, wherein the topside film exhibits an increased thickness adjacent to the serpentine pattern. The increased thickness of the serpentine pattern results in a relatively strong topside film structure near the edges of the substrate. As a result, the portions of the topside film located over inner traces of the uppermost conductive layer are protected from excessive forces during thermal cycling.
摘要:
A CAM device includes an array of multi-compare port CAM cells therein. The CAM cells are configured to support concurrent search operations between multiple distinct search words and entries within the rows of the CAM array. These concurrent search operations may be performed in-sync with respective clock signals that are asynchronous relative to each other.