ST7DALIF2 datasheet(129/171 Pages) STMICROELECTRONICS

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ST7DALIF2

Electrical characteristics

129/171

Table 63.

Current characteristics

Symbol

Ratings

Maximum value

Unit

IVDD

Total current into VDD power lines (source)

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

- 25

IINJ(PIN)

(1) & (2)

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 and OSC2 pins

± 5

Injected current on PB0 and PB1 pins (3)

No negative current injection allowed on PB0 and PB1 pins.

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 characterization with

ΣI

INJ(PIN) maximum

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

± 5

ΣI

INJ(PIN)

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

pins) (4)

± 20

Table 64.

Thermal characteristics

Symbol

Ratings

Value

Unit

TSTG

Storage temperature range

-65 to +150

°C

Maximum junction temperature (see Table 94 on page 160)

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