ST7L09 datasheet(84/104 Pages) STMICROELECTRONICS

84 / 104 page

ST7L05, ST7L09

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13.8 I/O PORT PIN CHARACTERISTICS

13.8.1 General Characteristics

Subject to general operating conditions for VDD, fOSC and TA (-40 to +105°C), unless otherwise specified.

Notes:

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

2. 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 57). 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.

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

scribed in Figure 53).

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

interrupt source.

Figure 52. Two Typical Applications with Unused I/O Pin Configured as Input

Figure 53. Typical IPU vs VDD with VIN =VSSl

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL

Input low level voltage

VSS -0.3

0.3 x VDD

VIH

Input high level voltage

0.7xVDD

VDD +0.3

Vhys

Schmitt trigger voltage

hysteresis1)

400

Input leakage current

VSS ≤ VIN ≤ VDD

±1

µA

Static current consumption induced by

each floating input pin2)

Floating input mode

400

RPU

Weak pull-up equivalent resistor3)

VIN = VSS

VDD = 5V

120

250

Ω

CIO

I/O pin capacitance

tf(IO)out

Output high to low level fall time1)

CL = 50pF

Between 10% and 90%

tr(IO)out

Output low to high level rise time1)

tw(IT)in

External interrupt pulse time4)

1tCPU

10k

Ω

UNUSED I/O PORT

ST7XXX

10k

Ω

UNUSED I/O PORT

ST7XXX

VDD

Caution

: During normal operation the ICCCLK pin must be pulled- up, internally or externally

(external pull-up of 10k mandatory in

This is to avoid entering ICC mode unexpectedly during a reset.

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.

TO BE CHARACTERIZED

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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