ST72F324LJ2T5 datasheet(124/154 Pages) STMICROELECTRONICS

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ST72324Lxx

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12.8 I/O PORT PIN CHARACTERISTICS

12.8.1 General Characteristics

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

Notes:

1. Data based on characterization results, not tested in production.

2. Hysteresis voltage between Schmitt trigger switching levels. Based on characterization results, not tested.

3. 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

4. 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 (see Figure 65). 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 tem-

perature values.

5. The RPU pull-up equivalent resistor is based on a resistive transistor (corresponding IPU current characteristics de-

scribed in Figure 66).

6. 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.

Figure 65. Connecting Unused I/O Pins

Figure 66. Typical IPU vs. VDD with VIN=VSS

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL

Input low level voltage 1)

0.3xVDD

VIH

Input high level voltage 1)

0.7xVDD

Vhys

Schmitt trigger voltage hysteresis 2)

0.8

IINJ(PIN)

Injected Current on flash device pin

PB0

Injected Current on other I/O pins

± 4

ΣIINJ(PIN)3)

Total injected current (sum of all I/O

and control pins)

VDD=3V

± 25

Ilkg

Input leakage current

VSS ≤ VIN ≤ VDD

±1

µA

Static current consumption

Floating input mode4)

200

RPU

Weak pull-up equivalent resistor 5)

VIN=VSS

VDD=3V

110

180

250

Ω

CIO

I/O pin capacitance

tf(IO)out

Output high to low level fall time 1)

CL=50pF

Between 10% and 90%

tr(IO)out

Output low to high level rise time 1)

tw(IT)in

External interrupt pulse time 6)

tCPU

10k

Ω

UNUSED I/O PORT

ST72XXX

10k

Ω

UNUSED I/O PORT

ST72XXX

VDD

Note: I/O can be left unconnected if it is configured as output

greater EMC robustness and lower cost.

(0 or 1) by the software. This has the advantage of

22 .5

33 .5

4 .5

5 .5

Vd d (V)

T a = 1 40° C

Ta = 9 5 ° C

Ta = 2 5 ° C

Ta = -4 5 ° C

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