ICM7209

The Harris ICM7209 is a versatile CMOS clock generator capable of driving a number of 5 volt systems with a variety of input requirements. When used to drive up to 5 TTL gates, the typical rise and fall times are 10ns.The ICM7209 consists of an oscillator, a buffered output equal to the oscillator frequency and a second buffered output having an output frequency one-eighth that of the oscillator.The guaranteed mvdmum oscillator frequency is 10MHz.Connecting the DISABLE terminal to the negative supply forces the÷8 output into the '0' state and the OUT1 into the '1' state.

The ICM7209 has the following features include:(1)high frequency operation---10mhz guaranteed; (2)requires only a quartz crystal and two capacitors; (3)bipolar, cmos compatibility; (4)high output drive capability---5×TTL fanout with 10ns rise and fall times; (5)low power----50mW at 10MHz; (6)choice of two output frequencies----OSC, and OSC.÷8 frequencies; (7)disable control for both outputs; (8)wide industrial temperature range----20°C to +85°C.The oscillator consists of a CMOS inverter with a non-linear resistor connected between the oscillator input and output to provide D.C. biasing.Using commercially obtainable quartz crystals the oscillator will operate from low frequencies (10kHz) to 10MHz.

The absolute maximum ratings of the ICM7209 are:(1)storage temperature range:-55 to +125°C;(2)operating temperature range:-20 to +85°C;(3)supply voltage:6V;(4)output voltage:Vss-0.3V to VDd+0.3 V;(5)input voltage:Vss-0.3V to VDd+0.3 V;(6)power disspation:300mA.Stresses above tlrose listed under "Absolute Maximum Ratings"may cause permanent damage to the device.These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the aperahbnal sections of the specifications is not implied.Exposure to absolute maximum rating corxlitians for extended periods may affect device reliability.The output drivers consist of CMOS inverters having active pullups and pulldowns. Thus the outputs can be used to directly drive TTL gates, other CMOS gates operating with a 5 volt supply, or TTL compatible MOS gates. The guaranteed fanout of the ICM7209 is 5 TTL loads although typical fanout capability is at least 10 TTL loads with slightly increased output rise and fall times.