摘要:
An electrostatic discharge protective circuit of the invention includes a silicon controller rectifier (SCR) and a current diverter. The current diverter is used to bypass an initial low current thereby to prevent the SCR from being triggered by the low current. Thus, a trigger current required to activate the SCR can be greatly increased thereby to maintain an internal circuit at a normal operating state.
摘要:
The protection circuit of the invention connects in series with an internal circuit between a first power source and a second power source. The protection circuit includes a switch which is connected with the internal circuit and one of the first power source and a second power source; and a delay circuit which connects with the switch. The switch which is controlled by the delay circuit is closed for providing a voltage to the internal circuit in normal operation mode, and is opened when an electrostatic stress occurs.
摘要:
An ESD protected structure and method of its fabrication are disclosed. A heavily doped polycrystalline silicon region of a first conductivity type is disposed on a substrate surface and is connected to a power supply voltage. A lightly doped region, of the first conductivity type, is disposed below the substrate surface and below the polycrystalline silicon region. A first heavily doped region, of the first conductivity type, of a first MOS device is disposed below the substrate surface, and contained entirely within the lightly doped region. A second heavily doped region, of the first conductivity type, of a second MOS device, is disposed below the substrate surface, and separated from the first region by a portion of the lightly doped region and a second conductivity type doped portion of the substrate. The separation of the first and second regions by a portion of the lightly doped region increases a turn-on voltage of a parasitic bipolar junction device that includes the first and second regions, the portion of the lightly doped region and the second conductivity type doped portion of the substrate. The increase in turn on voltage, in turn, tends to prevent the bipolar junction device from turning on, during an ESD event, before an ESD protection device that protects the structure from ESD events which occur within the power supply voltage. According to the fabrication process, the heavily doped polycrystalline silicon region is formed on the substrate surface and impurities are thermally diffused therefrom below the substrate surface to form the lightly doped region.
摘要:
A CMOS device containing a plurality of hexagon cells over a semiconductor substrate is disclosed. Each hexagon cell includes a hexagonal ring gate, a drain diffusion region and a source diffusion region. The hexagonal ring gate is made of conducting materials and a dielectric layer over the substrate, therefore defining a channel region in the substrate between the gate and the substrate. The entire drain diffusion region in the substrate is enclosed by the hexagonal ring gate. The source diffusion region surrounds the hexagonal ring gate in the substrate. Each hexagon cell further provides a drain contact in the center of the drain diffusion region. A plurality of source contacts are arranged around the ring gate over the substrate. The hexagon cells of a unique hexagon device are surrounded by a first guard ring and a second guard ring. The hexagon device can be used as a CMOS output buffer or input ESD protection circuit to reduce the layout area of an integrated circuit.
摘要:
The present invention is an electronic device, and more particularly an MOS transistor. A square-type layout style is used to realize the MOS device. By using the present layout style, the output driving/sinking capability of output buffers as well as the ESD protection capability of NMOS and PMOS devices in output buffers or input ESD protection circuits are significantly improved within smaller layout area. Both drain diffusion area and drain-to-bulk parasitic capacitance at the output node are reduced by this square-type layout. Devices using the present layout style can be assembled to form larger, rectangular (or square) and similarly functioning devices. Thus, the present square-type layout style is very attractive to submicron CMOS VLSI/ULSI in high-density and high-speed applications.
摘要:
An integrated circuit package includes a semiconductor chip, bonding pads on the semiconductor chip, a plurality of wired pins wire-bonded respectively to the bonding pads, and at least one non-wired pin. The non-wired pin is connected electrically to an adjacent one of the wired pins to prevent electrostatic discharge failure in the integrated circuit package due to electrostatic discharge stressing of the non-wired pin.
摘要:
A method for making a semiconductor device includes providing a substrate of a first conductivity type and having a surface region, forming a well region of a second conductivity type and having a first depth in the substrate, adding a gate dielectric layer overlying the surface region, adding a gate layer overlying the gate dielectric layer, forming a first LDD region of the first conductivity type and having a second depth within the well region, forming an emitter region of the second conductivity type within the first LDD region, and forming a second LDD region of the first conductivity type with the well region, a channel region separates the first and second LDD regions. The method further includes forming a source region being of the first conductivity type within the second LDD region and adding an output pad coupled to both the drain and emitter regions.
摘要:
A semiconductor device for ESD protection includes a semiconductor substrate of a first conductivity type and a well region of a second conductivity type formed within the substrate. The well region is characterized by a first depth. The device includes an MOS transistor, a first bipolar transistor, and a second bipolar transistor. The MOS transistor includes a first lightly doped drain (LDD) region of a second depth within the well region, and a drain region and an emitter region within in the first LDD region. The emitter region is characterized by a second conductivity type. The first bipolar transistor is associated with the emitter region, the first LDD region, and the well region, and is characterized by a first trigger voltage. The second bipolar transistor is associated with the first LDD region, the well region, and the substrate, and is characterized by a second trigger voltage.
摘要:
A system and method for controlling an input/output driver. The system includes a control system configured to receive a first supply voltage and a second supply voltage and generate a control signal, and a first transistor including a first gate, a first terminal, and a second terminal. The first gate is configured to receive the control signal, and the first terminal is configured to receive the first supply voltage. Additionally, the system includes a second transistor including a second gate, a third terminal, and a fourth terminal, and the second gate is coupled to the second terminal. Moreover, the system includes a third transistor including a third gate, a fifth terminal, and a sixth terminal, and the third gate is configured to receive the control signal. Also, the system includes an input/output pad coupled to the fourth terminal and the fifth terminal.
摘要:
The invention describes the fabrication and structure of an ESD protection device for integrated circuit semiconductor devices with improved ESD protection and resiliency. A vertical bipolar npn transistor forms the basis of the protection device. To handle the large current requirements of an ESD incident, the bipolar transistor has multiple base and emitter elements formed in an npn bipolar array. To assure turn-on of the multiple elements of the array the emitter fingers are continuously or contiguously connected with an unique emitter design layout. The contiguous emitter design provides an improved electrical emitter connection for the device, minimizing any unbalance that can potentially occur when using separate emitter fingers and improving the ability for the simultaneous turn on of the multiple emitter-base elements. The emitter is contained within the footprint of the collector elements, and enables containment of device size, therefore minimizing device capacitance characteristics important in high speed circuit design. Other embodiments of the invention use variations in the structure of the common contiguous emitter conductor as well as different base conductor structure layouts.