ST72589BW datasheet(140/158 Pages) STMICROELECTRONICS

140 / 158 page

ST72589BW, ST72389BW

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9.2 RECOMMENDED OPERATING CONDITIONS

Note 1:

Positive injection

The Iinj+ is done through protection diodes insulated from the substrate of the die.

The pins which have a high voltage capability like true open-drain do not accept positive injection. In this

case the maximum voltage rating must be followed.

Note 2:

ADC accuracy reduced by negative injection

The Iinj- is done through protection diodes NOT INSULATED from the substrate of the die. The drawback

is a small leakage (few µA) induced inside the die when a negative injection is performed. This leakage is

tolerated by the digital structure, but it acts on the analog line according to the impedance versus a leak-

age 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 maximum imped-

ance close to 50K

Ω.

Location of the negative current injection:

- The pins with analog input capability are the more sensitive. Iinj- maximum is 0.8 mA (assuming that the

impedance of the analog voltage is lower than 25K

Ω)

- The pure digital pins can tolerate 1.6mA. In addition, the best choice is to inject the current as far as pos-

sible 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 and negative currents respectively (instantaneous values).

9.3 TIMING CHARACTERISTICS

(Operating conditions TA = -40 to +85°C unless otherwise specified)

∆t

INST is the number of tCPU to finish the current instruction execution.

GENERAL

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDD

Supply Voltage

fOSC = 16MHz

4.5

5.0

5.5

fOSC

Oscillator frequency

4.5V < VDD < 5.5V

MHz

Ambient Temperature Range

-40

+85

°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

5mA

IINJ-

Total negative injected current (2)

VEXTERNAL < VSS

Digital pins

Analog pins

1.6

0.8

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fOSC

External Oscillator Frequency

VDD = 4.5V

MHz

tDOG

Watchdog Time-out

fCPU = 8MHz

12,288

1.54

786,432

98.3

tCPU

tINST

Instruction Time

tCPU

tIRT

Interrupt Reaction Time

tIRT = ∆tINST + 10*

tCPU

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