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QX3 On-Board DRAM

The digital imaging circuitry on the Intel QX3 microscope contains a 4 Mb DRAM (dynamic random access memory) chip to handle storage of images prior to transfer to the computer main RAM bank. The photomicrograph below is a reflected differential interference image of the surface of this chip.

Designed for high performance in portable computer systems and low-power peripheral applications like the QX3, this integrated circuit is part of the Mosel Vitelic lineup of random access memory chips. Code-named the V53C16258L, this 3.3 volt CMOS dynamic RAM chip offers Page mode with Extended Data Output and features a 256K x 16-bit organization.

The chip reads and writes data by multiplexing an 18-bit address into a 9-bit row and 9-bit column address with access times of 35, 40, 45, and 50 nanoseconds. Also featured are an optional self-refresh and a TTL interface.

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