User's Manual

HE910 Hardware User Guide
1vv0300925 Rev.28 – 2015-06-24
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 59 of 59
8 Logic level specifications
The following table shows the logic level specifications used in the HE910 interface circuits:
Absolute Maximum Ratings -Not Functional
Parameter Min Max
Input level on any digital pin (CMOS 1.8) with respect to ground -0.3V 2.1V
Input level on any digital pin (CMOS 1.2) with respect to ground -0.3V 1.4V
Operating Range - Interface levels (1.8V CMOS)
Level Min Max
Input high level 1.5V 1.9V
Input low level 0V 0.35V
Output high level 1.6V 1.9V
Output low level 0V 0.2V
Operating Range - Interface levels (1.2V CMOS)
Level Min Max
Input high level 0.9V 1.3V
Input low level 0V 0.3V
Output high level 1V 1.3V
Output low level 0V 0.1V
Current characteristics
Level Typical
Output Current 1mA
Input Current 1uA