California Micro Devices (CMD) has introduced the PACZIG1284, the first device to protect parallel ports against electro-magnetic interference (EMI) in PCs with frequencies from 100 MHz to 3 GHz. The device also provides termination and protects parallel ports with a high level of electrostatic discharge (ESD) protection.
The PACZIG1284 owes its capabilities to California Micro Devices' proprietory Zero Inductance Ground (ZIG) technology. This technology connects the filters inside the PACZIG1284 directly to the PC motherboard through a metallic pad that protrudes through the bottom of the package, rather than through bond wires and ground pins. This eliminates the inductance that limits other filtering solutions. The result is a filter that performs just as well at lower frequencies as previous solutions, but now also extends the filtering capability out to 3 GHz.
CMD designed the PACZIG1284 to be backward compatible with its popular PACSZ1284, and also integrates 69 discrete components into a single device, reducing board space and manufacturing costs. Both come in a 28-pin QSOP package and have identical pinouts. The PACZIG1284, however, has the addition of the ZIG pad on the bottom of the package. This allows OEMs to create a single layout, and use the lower-cost PACSZ1284 in systems that do not need high-frequency filtering, and easily upgrade to the PACZIG1284 for PCs requiring higher-frequency filtering.
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