ST72321R7-Auto datasheet(203/243 Pages) STMICROELECTRONICS

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ST72321xx-Auto

Electrical characteristics

Doc ID 13829 Rev 1

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19.8

I/O port pin characteristics

19.8.1

General characteristics

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

Table 126.

I/O port pin general characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL

Input low level voltage(1)

CMOS ports

0.3xVDD

VIH

Input high level voltage(1)

0.7xVDD

Vhys

Schmitt trigger voltage hysteresis(2)

0.7

IINJ(PIN)

(3)

Injected current on PC6 pin (Flash devices

only)

VDD =5V

0+4

Injected current on an I/O pin

±4

I

INJ(PIN)

(3) Total injected current (sum of all I/O and

control pins)

±25

Input leakage current

VSS < VIN < VDD

±1

µA

Static current consumption

Floating input mode(4)

400

RPU

Weak pull-up equivalent resistor(5)

VIN =VSS VDD = 5V

120

250



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)

1tCPU

Data based on characterization results, not tested in production.

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

When the current limitation is not possible, the VIN maximum must be respected, otherwise refer to IINJ(PIN) specification. A

positive injection is induced by VIN >VDD while a negative injection is induced by VIN <VSS. Refer to Section 19.2.2:

Current characteristics for more details.

Configuration not recommended. All unused pins must be kept at a fixed voltage. This can be done by using the output

mode of the I/O, for example, and leaving the I/O unconnected on the board or by an external pull-up or pull-down resistor

(see Figure 82). 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 83).

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.

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