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Detailed Description

Supply Voltage Considerations

The ICM7213 may be used to provide various precision

4.194304MHz quartz oscillator, and other output frequencies

may be obtained using other quartz crystal frequencies.

Since the ICM7213 uses dynamic high frequency dividers for

the initial frequency division there are limitations on the

example, a low frequency quartz crystal is selected, the

window, or approximately 1.7V.

voltage supply by using a simple resistor divider (if power is

of no concern), by using a series resistor for minimum

current consumption, or by means of a regulator.

Outputs

Pull up resistors will generally be required to interface with

other logic families. These resistors must be connected

between the various outputs and the positive power supply.

Oscillator Considerations

The oscillator consists of a CMOS inverter and a feedback

resistor whose value is dependent on the voltage at the

Oscillator stabilities of approximately 0.1ppm per 0.1V varia-

gle voltage dropping resistor. The crystal specifications are

shown in the Test Circuit.

It is recommended that the crystal load capacitance (CL) be

no greater than 22pF for a crystal having a series resistance

equal to or less than 75

Ω, otherwise the output amplitude of

the oscillator may be too low to drive the divider reliably.

It a very high quality oscillator is desired, it is recommended

that a quartz crystal be used having a tight tuning tolerance

±10ppm, a low series resistance (less than 25Ω), a low

motional capacitance of 5mpF and a load capacitance of

lator tuning capacitor should range between approximately

16pF and 60pF.

Use of a high quality crystal will result in typical stabilities of

Control Inputs

testing of the

÷ 60 section by a factor of 2048 times. This

also results in alternative output frequencies (see table).

The WIDTH input may be used to change the pulse width of

OUT 4 from 125ms to 1s, or to change the state of OUT 4

from ON to OFF during INHIBIT.

See Figures 1 and 2 for output waveforms and effect of

control inputs.

ICM

7213

EXAMPLE:

f = 4.2MHz

8V

≤ V ≤ 12V (10 NOMINAL)

FIGURE 9A.

EXAMPLE:

8V

≤ V ≤ 12V (10 NOMINAL)

R3 = (10 - 3)

10 - 4

k

Ω

ICM

7213

FIGURE 9B.

FIGURE 9. BIASING SCHEMES WITH HIGH VOLTAGE SUPPLIES

ICM7213