MDS 728 B

4

Revision 012505

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ICS728

capacitance. Contact ICS for details.) If the centering

error is more than 25 ppm positive, add identical fixed

centering capacitors from each crystal pin to ground.

The value for each of these caps (in pF) is given by:

External Capacitor = 2 x (centering error)/(trim

sensitivity)

Trim sensitivity is a parameter which can be supplied by

your crystal vendor. If you do not know the value,

assume it is 30 ppm/pF. After any changes, repeat the

measurement to verify that the remaining error is

acceptably low (typically less than ±25 ppm).

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS728. These ratings, which

are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the

device at these or any other conditions above those indicated in the operational sections of the

specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can

affect product reliability. Electrical parameters are guaranteed only over the recommended operating

temperature range.

Recommended Operation Conditions

Item

Rating

Supply Voltage, VDD

7 V

All Inputs and Outputs

-0.5 V to VDD+0.5 V

Storage Temperature

-65 to +150

°C

Soldering Temperature

260

°C

Parameter

Min.

Typ.

Max.

Units

Ambient Operating Temperature

0

+70

°C

Power Supply Voltage (measured in respect to GND)

+3.15

+3.45

V

Reference crystal parameters

Refer to page 3