ST7LITE49M datasheet(144/188 Pages) STMICROELECTRONICS

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Electrical characteristics

ST7LITE49M

144/188

Table 66.

Current characteristics

Symbol

Ratings

Maximum value

Unit

IVDD

Total current into VDD power lines (source)

(1)

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

IVSS

Total current out of VSS ground lines (sink)

(1)

150

IIO

Output current sunk by any standard I/O and control

Output current sunk by any high sink I/O pin

Output current source by any I/Os and control pin

- 25

IINJ(PIN)

(2)(3)

IINJ(PIN) must never be exceeded. This is implicitly insured if VIN maximum is respected. If VIN maximum

cannot be respected, the injection current must be limited externally to the IINJ(PIN) value. A positive

injection is induced by VIN>VDD while a negative injection is induced by VIN<VSS. For true open-drain

pads, there is no positive injection current, and the corresponding VIN maximum must always be respected

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 0.8 mA (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.

Injected current on RESET pin

± 5

Injected current on OSC1/CLKIN and OSC2 pins

± 5

Injected current on any other pin(4)

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

characterisation with

ΣI

INJ(PIN) maximum current injection on four I/O port pins of the device.

± 5

ΣI

INJ(PIN)

(2)

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

pins)(4)

± 20

Table 67.

Thermal characteristics

Symbol

Ratings

Value

Unit

TSTG

Storage temperature range

-65 to +150

°C

Maximum junction temperature (see Table 105: Thermal characteristics on

page 186)

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