ST7263BEx datasheet(140/186 Pages) STMICROELECTRONICS

140 / 186 page

Electrical characteristics

ST7263Bxx

140/186

Doc ID 7516 Rev 8

Table 56.

Current characteristics

Symbol

Ratings

Maximum value

Unit

IVDD

Total current into VDD power lines (source)

(1)

IVSS

Total current out of VSS ground lines (sink)

(1)

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)

(2)(3)

Injected current on VPP pin

± 5

Injected current on RESET pin

± 5

Injected current on OSCIN and OSCOUT pins

± 5

Injected current on any other pin(4)(5)

± 5

ΣI

INJ(PIN)

(2)

Total injected current (sum of all I/O and

control pins)(4)

± 20

IINJ(PIN)

(2)(3)

Negative injected current to PB0 (10 mA)/AIN0

- 80

µA

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

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.

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.

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

Table 57.

Thermal characteristics

Symbol

Ratings

Value

Unit

TSTG

Storage temperature range

-65 to +150

°C

Maximum junction temperature

See Section 14.2:

Thermal

characteristics for

TJmax

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