CMOSCMOS logic is a newer technology, based on the use of complementary MOS transistors to perform logic functions with almost no current required. This makes these gates very useful in battery-powered applications. The fact that they will work with supply voltages as low as 3 volts and as high as 15 volts is also very helpful. Also known as a RTC/NVRAM or CMOS RAM, CMOS is short for Complementary Metal-Oxide Semiconductor. CMOS is an on-board semiconductor chip powered by a CMOS battery inside IBM compatible computers that stores information such as the system time and system settings for your computer. A CMOS is similar to the Apple Macintosh computer's PRAMShort for complementary metal oxide
semiconductor. Pronounced see-moss, CMOS is a widely used type of
semiconductor. CMOS semiconductors use both NMOS (negative polarity) and
PMOS (positive polarity) circuits. Since only one of the circuit types is on
at any given time, CMOS chips require less power than chips using just one
type of transistor. This makes them particularly attractive for use in
battery-powered devices, such as portable computers. Personal computers also
contain a small amount of battery-powered CMOS memory to hold the date,
time, and system setup parameters. |
|