EFM8UB1 Datasheet, PDF (13/59 Pages) Silicon Laboratories – The EFM8UB1 highlighted features are listed below

4. Electrical Specifications
EFM8UB1 Data Sheet
Electrical Specifications
4.1 Electrical Characteristics
All electrical parameters in all tables are specified under the conditions listed in Table 4.1 Recommended Operating Conditions on page
12, unless stated otherwise.
4.1.1 Recommended Operating Conditions
Table 4.1. Recommended Operating Conditions
Parameter
Symbol
Operating Supply Voltage on VDD ^VDD
1
Test Condition
Min
Typ
Max
Unit
2.2
—
3.6
V
Operating Supply Voltage on VIO ^{3 V}IO
1.71
—
V_DD
V
Operating Supply Voltage on VRE- V_REGIN
GIN
3.0
—
5.25
V
System Clock Frequency
f_SYSCLK
0
—
50
MHz
Operating Ambient Temperature T_A
-40
—
85
°C
Note:
1. Standard USB compliance tests require 3.0 V on VDD for compliant operation.
2. All voltages with respect to GND.
3. On devices without a VIO pin, V_IO = V_DD.
4. GPIO levels are undefined whenever VIO is less than 1 V.
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