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ST7SCR Datasheet(PDF) 77 Page - STMicroelectronics

Part # ST7SCR
Description  8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER
PDF  102 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7SCR Datasheet(HTML) 77 Page - STMicroelectronics

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ST7SCR
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14.2 RECOMMENDED OPERATING CONDITIONS
(Operating conditions TA = 0 to +70°C unless otherwise specified)
Note 1: Positive injection
The IINJ+ is done through protection diodes insulated from the substrate of the die.
Note 2: For SmartCard I/Os, VCARD has to be considered.
Note 3: Negative injection
– The IINJ- is done through protection diodes NOT INSULATED from the substrate of the die. The draw-
back is a small leakage (few µA) induced inside the die when a negative injection is performed. This leak-
age is tolerated by the digital structure, but it acts on the analog line according to the impedance versus
a leakage current of few µA (if the MCU has an AD converter). The effect depends on the pin which is
submitted to the injection. Of course, external digital signals applied to the component must have a max-
imum impedance close to 50K
Ω.
Location of the negative current injection:
– Pure digital pins can tolerate 1.6mA. In addition, the best choice is to inject the current as far as possible
from the analog input pins.
General Note: When several inputs are submitted to a current injection, the maximum IINJ is the sum of
the positive (resp. negative) currrents (instantaneous values).
GENERAL
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDD
Supply voltage
4.0
5.5
V
fOSC
External clock source
4
MHz
TA
Ambient temperature range
0
70
°C
CURRENT INJECTION ON I/O PORT AND CONTROL PINS
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
IINJ+
Total positive injected current (1)
VEXTERNAL > VDD
(Standard I/Os)
VEXTERNAL > VSC_PWR
(Smartcard I/Os)
20
mA
IINJ-
Total negative injected current (2,3)
VEXTERNAL < VSS
Digital pins
Analog pins
20
mA



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