ST7LITE20F2 datasheet(134/166 Pages) STMICROELECTRONICS

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Electrical characteristics

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Doc ID 8349 Rev 5

Figure 67. Two typical applications with unused I/O Pin

Caution:

To avoid entering ICC mode unexpectedly during a reset, the ICCCLK pin must be pulled-up

internally or externally during normal operation (external pull-up of 10k mandatory in noisy

environment).

Note:

I/O can be left unconnected if it is configured as output (0 or 1) by the software. This has the

advantage of greater EMC robustness and lower cost.

Figure 68. Typical IPU vs. VDD with VIN=VSS

tf(IO)out

Output high to low level fall time(2)

CL=50pF

Between 10% and 90%

−

tr(IO)out

Output low to high level rise time(2)

−

tw(IT)in

External interrupt pulse time(5)

−

−−

tCPU

Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified.

Data based on characterization results, not tested in production.

Configuration not recommended, all unused pins must be kept at a fixed voltage: using the output mode of the I/O for

example or an external pull-up or pull-down resistor (seeFigure 67). Static peak current value taken at a fixed VIN value,

based on design simulation and technology characteristics, not tested in production. This value depends on VDD and

temperature values.

The RPU pull-up equivalent resistor is based on a resistive transistor (corresponding IPU current characteristics described in

Figure 68).

To generate an external interrupt, a minimum pulse width has to be applied on an I/O port pin configured as an external

interrupt source.

Table 80.

General Characteristics(1) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

10k

UNUSED I/O PORT

ST7XXX

10k

UNUSED I/O PORT

ST7XXX

VDD

22.5

33 .5

4.5

55.5

Vdd(V)

Ta=1 40°C

Ta=9 5°C

Ta=2 5°C

Ta=-45 °C

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