ST72334J2TASLASHXXX datasheet(109/150 Pages) STMICROELECTRONICS

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15.2 ABSOLUTE MAXIMUM RATINGS

Stresses above those listed as “absolute maxi-

mum ratings” may cause permanent damage to

the device. This is a stress rating only and func-

tional operation of the device under these condi-

tions is not implied. Exposure to maximum rating

conditions for extended periods may affect device

reliability.

15.2.1 Voltage Characteristics

15.2.2 Current Characteristics

Notes:

1. Directly connecting the RESET and I/O pins to VDD or VSS could damage the device if an unintentional internal reset

is generated or an unexpected change of the I/O configuration occurs (for example, due to a corrupted program counter).

To guarantee safe operation, this connection has to be done through a pull-up or pull-down resistor (typical: 4.7k

Ω for

RESET, 10k

Ω for I/Os). Unused I/O pins must be tied in the same way to V

DD or VSS according to their reset configuration.

2. When the current limitation is not possible, the VIN absolute maximum rating must be respected, otherwise refer to

IINJ(PIN) specification. A positive injection is induced by VIN>VDD while a negative injection is induced by VIN<VSS.

3. All power (VDD) and ground (VSS) lines must always be connected to the external supply.

4. Negative injection disturbs the analog performance of the device. In particular, it induces leakage currents throughout

the device including the analog inputs. To avoid undesirable effects on the analog functions, care must be taken:

- Analog input pins must have a negative injection less than 0.8mA (assuming that the impedance of the analog voltage

is lower than the specified limits)

- Pure digital pins must have a negative injection less than 1.6mA. In addition, it is recommended to inject the current as

far as possible from the analog input pins.

5. When several inputs are submitted to a current injection, the maximum

ΣI

INJ(PIN) is the absolute sum of the positive

and negative injected currents (instantaneous values). These results are based on characterization with

ΣI

INJ(PIN) maxi-

mum current injection on four I/O port pins of the device.

6. True open drain I/O port pins do not accept positive injection.

Symbol

Ratings

Maximum value

Unit

VDD - VSS

Supply voltage

6.5

VDDA - VSSA

Analog Reference Voltage

6.5

VIN

1) & 2)

Input voltage on true open drain pin

VSS-0.3 to 6.5

Input voltage on any other pin

VSS-0.3 to VDD+0.3

∆V

DDx| and |∆VSSx|

Variations between different digital power pins

VDDX- VDDA

|VSSA - VSSx|

Variations between digital and analog power pins

VESD(HBM)

Electrostatic discharge voltage (Human Body Model)

see Section 15.7.2 "Absolute Electri-

cal Sensitivity" on page 125

VESD(MM)

Electrostatic discharge voltage (Machine Model)

Symbol

Ratings

Maximum value

Unit

IVDD

Total current into VDD power lines (source)

150

IVSS

Total current out of VSS ground lines (sink)

150

IIO

Output current sunk by any standard I/O and control pin

Output current sunk by any high sink I/O pin

Output current source by any I/Os and control pin

- 25

IINJ(PIN)

2) & 4)

Injected current on ISPSEL pin

± 5

Injected current on RESET pin

± 5

Injected current on OSC1 and OSC2 pins

± 5

Injected current on any other pin 5) & 6)

± 5

ΣI

INJ(PIN)

Total injected current (sum of all I/O and control pins) 5)

± 20

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