ST72344K2 datasheet(216/247 Pages) STMICROELECTRONICS

216 / 247 page

Electrical characteristics

ST72344xx, ST2345xx

216/247

Doc ID 12321 Rev 6

Figure 98.

Two typical applications with unused I/O pin

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.

Caution:

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

pull-up of 10k mandatory in noisy environment). This is to avoid entering ICC mode

unexpectedly during a reset.

10k

UNUSED I/O PORT

ST7XXX

10k

UNUSED I/O PORT

ST7XXX

VDD

Table 108.

Output driving current (1)

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

Symbol

Parameter

Conditions

Min

Max

Unit

VOL

(2)

The IIO current sunk must always respect the absolute maximum rating specified in Table 85: Current

characteristics and the sum of IIO (I/O ports and control pins) must not exceed IVSS.

Output low level voltage for a standard I/O

pin when 8 pins are sunk at same time

(see Figure 101)

IIO = +5 mA

1.0

IIO = +2 mA

0.4

Output low level voltage for a high sink I/O

pin when 4 pins are sunk at same time

(see Figure 104)

IIO = +20 mA

1.3

IIO = +8 mA

0.75

VOH

(3)

The IIO current sourced must always respect the absolute maximum rating specified in Table 85: Current

characteristics and the sum of IIO (I/O ports and control pins) must not exceed IVDD.

Output high level voltage for an I/O pin

when 4 pins are sourced at same time

(see Figure 113)

IIO = -5 mA

VDD-1.5

IIO = -2 mA

VDD-0.8

VOL

(2)(4)

Not tested in production, based on characterization results.

Output low level voltage for a standard I/O

pin when 8 pins are sunk at same time

(see Figure 100)

IIO = +2 mA

0.7

Output low level voltage for a high sink I/O

pin when 4 pins are sunk at same time

IIO = +8 mA

0.5

VOH

(3)(4)

Output high level voltage for an I/O pin

when 4 pins are sourced at same time

(Figure 111)

IIO = -2 mA

VDD-0.8

VOL

(2)(4)

Output low level voltage for a standard I/O

pin when 8 pins are sunk at same time

(see Figure 102)

IIO = +2 mA

0.9

Output low level voltage for a high sink I/O

pin when 4 pins are sunk at same time

IIO = +8 mA

0.6

VOH

(3)(4)

Output high level voltage for an I/O pin

when 4 pins are sourced at same time

(see Figure 110)

IIO = -2 mA

VDD-0.9

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