ST7263BEx datasheet(149/186 Pages) STMICROELECTRONICS

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ST7263Bxx

Electrical characteristics

Doc ID 7516 Rev 8

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13.8

I/O port pin characteristics

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

Figure 60.

Two typical applications with unused I/O pin

Table 69.

Electrical sensitivities

Symbol

Parameter

Conditions

Class(1)

Class description: A Class is an STMicroelectronics internal specification. All its limits are higher than the

JEDEC specifications, that means when a device belongs to Class A it exceeds the JEDEC standard. B

Class strictly covers all the JEDEC criteria (international standard).

Static latchup class

TA=+25 °C

Table 70.

General characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL

Input low level voltage

0.3xVDD

VIH

Input high level voltage

0.7xVDD

VIN

Input voltage

True open drain I/O pins

VSS

-6.0

Other I/O pins

VDD

Vhys

Schmitt trigger voltage hysteresis

400

Input leakage current

VSS≤VIN≤VDD

±1

µA

Static current consumption induced

by each floating input pin(1)

Floating input mode

400

RPU

Weak pull-up equivalent resistor(2)

VIN=VSS

VDD=5 V

120

CIO

I/O pin capacitance

tf(IO)out

Output high to low level fall time

CL=50pF

Between 10% and 90%

-25

tr(IO)out

Output low to high level rise time

tw(IT)in

External interrupt pulse time(3)

tCPU

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 60). 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 61).

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.

10k

UNUSED I/O PORT

ST72XXX

10k

UNUSED I/O PORT

ST72XXX

VDD

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