ST7232A datasheet(127/154 Pages) STMICROELECTRONICS

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ST7232A

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I/O PORT PIN CHARACTERISTICS (Cont’d)

12.8.2 Output Driving Current

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

Figure 67. Typical VOL at VDD=5V (std. ports)

Figure 68. Typ. VOL at VDD=5V (high-sink ports)

Figure 69. Typical VOH at VDD=5V

Notes:

1. The IIO current sunk must always respect the absolute maximum rating specified in Section 12.2.2 and the sum of IIO

(I/O ports and control pins) must not exceed IVSS.

2. The IIO current sourced must always respect the absolute maximum rating specified in Section 12.2.2 and the sum of

IIO (I/O ports and control pins) must not exceed IVDD. True open drain I/O pins do not have VOH.

Symbol

Parameter

Conditions

Min

Max

Unit

VOL

Output low level voltage for a standard I/O pin

when 8 pins are sunk at same time

(see Figure 67)

IIO=+5mA

1.2

IIO=+2mA

0.5

Output low level voltage for a high sink I/O pin

when 4 pins are sunk at same time

(see Figure 68 and Figure 70)

IIO=+20mA, TA≤85°C

TA>85°C

1.3

1.5

IIO=+8mA

0.6

VOH

Output high level voltage for an I/O pin

when 4 pins are sourced at same time

(see Figure 69 and Figure 72)

IIO=-5mA, TA≤85°C

TA>85°C

VDD-1.4

VDD-1.6

IIO=-2mA

VDD-0.7

0.2

0.4

0.6

0.8

1.2

0.005

0.01

0.015

Iio(A )

Ta =14 0°C "

Ta =95 °C

Ta =25 °C

Ta =-45 °C

510

IIO (mA)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

0.01

0.02

0.03

Iio(A)

Ta= 140 °C

Ta= 95 °C

Ta= 25 °C

Ta= -45°C

IIO (mA)

2.5

3.5

4.5

5.5

-0.01

-0.008

-0.006

-0.004

-0.002

Iio (A )

V dd= 5V 1 40°C m in

V dd= 5v 95°C m in

V dd= 5v 25°C m in

V dd= 5v -4 5°C m in

-10

-8

-6

-4

-2

IIO (mA)

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