User guide

UC864-E/G/WD/WDU Hardware User Guide
1vv0300766a Rev.4
- 03/02/09
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 36 of 78
7. Logic Level Specifications
Where not specifically stated, all the interface circuits work at 2.6V CMOS logic
levels. The following table shows the logic level specifications used in the Telit
UC864-E/G/ WD/WDU interface circuits:
For 2.6V CMOS signals:
Absolute Maximum Ratings -Not Functional
UC864-E/G/WD/WDU
Parameter
Min Max
Input level on any
digital pin when on
-0.3V +3.0V
Input voltage on
analog pins when on
-0.3V +3.0 V
Operating Range - Interface levels
UC864-E/G/WD/WDU
Level
Min Max
Input high level 2.0V 2.9 V
Input low level -0.3V 0.6V
Output high level 2.2V 2.6V
Output low level 0V 0.35V
For 1,8V signals:
Operating Range - Interface levels (1.8V CMOS)
UC864-E/G/WD/WDU
Level
Min Max
Input high level 1.5V 2.1V
Input low level -0.3V 0.5V
Output high level 1.4V 1.8V
Output low level 0V 0.35V
NOTE:
Do not connect UC864-E/G/WD/WDU’s digital logic signal directly to OEM’s digital
logic signal of with level higher than 3.0V.