ST8024 datasheet(12/31 Pages) STMICROELECTRONICS

12 / 31 page

Electrical characteristics

ST8024

12/31

Table 12.

Data lines to microcontroller (pins I/OUC, AUX1UC AND AUX2UC with integrated 11

Ω pull-up resistor to VDD (VDD = 3.3 V, VDDP = 5 V, fXTAL = 10 MHz, unless otherwise

noted. Typical values are to TA = 25 °C)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VOH

High level output voltage

5 and 3 V card; IOH < − 40µA

0.75 VDD

VDD+0.1

No DC Load

0.9 VDD

VDD+0.1

VOL

Low level output voltage

IOL = 1 mA

0.3

VIH

High level input voltage

0.7 VDD

VDD+0.3

VIL

Low level input voltage

-0.3

0.3 VDD

|ILIH|

High level input leakage

current

VIH = VDD

µA

|IL|

Low level input current

VIL = 0 V

600

µA

RPU

Internal pull-up resistance to

VDD

Pull-up resistor to VDD

911

tT(DI)

Data input transition time

VIL(max) to VIH(min)

1.2

µs

tT(DO)

Data output transition time

VO = 0 to VDD; CL < 30 pF;

10% to 90%

0.1

µs

IPU

Current when pull-up active

VOH = 0.9VDD; CL = 30 pF

-1

Table 13.

Internal oscillator (VDD = 3.3 V, VDDP = 5 V, fXTAL = 10 MHz, unless otherwise noted.

Typical values are to TA = 25 °C)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

fOSC(INT)

Frequency of internal oscillator

Inactive mode

140

200

kHz

Active mode

2.2

2.7

3.2

MHz

Table 14.

Reset output to card reader (pin RST) (VDD = 3.3 V, VDDP = 5 V, fXTAL = 10 MHz, unless

otherwise noted. Typical values are to TA = 25 °C)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VO(inactive)

Output voltage in inactive

mode

IO(inactive) = 1 mA

0.3

No Load

0.1

IO(inactive)

Output current

Inactive mode; pin grounded

-1

tD(RSTIN-RST) RSTN to RST Delay

RST Enable

µs

VOL

Low level output voltage

IOL = 200 µA

0.2

IOL = 20 mA (current limit)

VCC-0.4

VCC

VOH

High level output voltage

IOH = -200 µA

0.9VCC

VCC

IOH = -20 mA (current limit)

0.4

tR, tF

Rise and fall time

CL = 100 pF; VCC = 5 or 3 V

0.1

µs

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