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GE864 Hardware User Guide
1vv0300694 Rev.10 - 10/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 31 of 69
7 Logic level specifications
Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels. The following
table shows the logic level specifications used in the Telit GE864-QUAD / PY interface circuits:
Absolute Maximum Ratings –Not Functional
Parameter Min Max
Input level on any
digital pin when on
-0.3V +3.6V
Input voltage on analog
pins when on
-0.3V +3.0 V
Operating Range – Interface levels (2.8V CMOS)
Level Min Max
Input high level 2.1V 3.3V
Input low level 0V 0.5V
Output high level 2.2V 3.0V
Output low level 0V 0.35V
For 1.8V signals:
Operating Range – Interface levels (1.8V CMOS)
Level Min Max
Input high level 1.6V 3.3V
Input low level 0V 0.4V
Output high level 1,65V 2.2V
Output low level 0V 0.35V
Current characteristics
Level Typical
Output Current 1mA
Input Current 1uA