STM8AL3136 datasheet(81/124 Pages) STMICROELECTRONICS

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STM8AL313x/4x/6x STM8AL3L4x/6x

Electrical parameters

108

Data memory

9.3.6

I/O current injection characteristics

As a general rule, current injection to the I/O pins, due to external voltage below VSS or

above VDD (for standard pins) should be avoided during normal product operation. However,

in order to give an indication of the robustness of the microcontroller in cases when

abnormal injection accidentally happens, susceptibility tests are performed on a sample

basis during device characterization.

Functional susceptibility to I/O current injection

While a simple application is executed on the device, the device is stressed by injecting

current into the I/O pins programmed in floating input mode. While current is injected into

the I/O pin, one at a time, the device is checked for functional failures.

The failure is indicated by an out of range parameter: ADC error, out of spec current

injection on adjacent pins or other functional failure (for example reset, oscillator frequency

deviation, LCD levels, etc.).

The test results are given in the following table.

Table 39. Data memory

Symbol

Parameter

Conditions

Min

Max

Unit

TWE

Temperature for writing and erasing

-40

125

°C

NWE

Data memory endurance

(erase/write cycles)(1)

1. The physical granularity of the memory is four bytes, so cycling is performed on four bytes even when a

write/erase operation addresses a single byte.

TA = 25 °C

300 k

cycles

TA = -40 to 125 °C 100 k(2)

2. More information on the relationship between data retention time and number of write/erase cycles is

available in a separate technical document.

tRET

Data retention time

TA = 25 °C

40(2)(3)

3. Retention time for 256B of data memory after up to 1000 cycles at 125 °C.

years

TA = 55 °C

20(2)(3)

Table 40. I/O current injection susceptibility

Symbol

Description

Functional susceptibility

Unit

Negative

injection

Positive

injection

IINJ

Injected current on true open-drain pins

(PC0 and PC1)

-5

Injected current on all five-volt tolerant (FT) pins

-5

Injected current on all 3.6 V tolerant (TT) pins

-5

Injected current on any other pin

-5

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