ST8024LCTR datasheet(14/35 Pages) STMICROELECTRONICS

14 / 35 page

Electrical characteristics

ST8024L

14/35

Doc ID 17709 Rev 5

Table 12.

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

11 k

Ω pull-up resistor to VDD)

Symbol

Parameter(1)

Test conditions

Min.

Typ.

Max.

Unit

VOH

High level output voltage

5 V, 3 V and 1.8 V cards;

IOH < –40 µA

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 = 0.9 VDD; CL = 30 pF

-1

VDD = 3.3 V, VDDP = 5 V, fXTAL = 10 MHz, unless otherwise noted. Typical values are at TA = 25 °C.

Table 13.

Internal oscillator

Symbol

Parameter(1)

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

VDD = 3.3 V, VDDP = 5 V, fXTAL = 10 MHz, unless otherwise noted.Typical values are at TA = 25 °C.

Table 14.

Reset output to card reader (pin RST)

Symbol

Parameter(1)

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)

RSTIN 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

0.9 VCC

-VCC

IOH = –20 mA (current limit)

0.4

tR, tF

Rise and fall time

CL = 100 pF

0.1

µs

VDD = 3.3 V, VDDP = 5 V, fXTAL = 10 MHz, unless otherwise noted. Typical values are at TA = 25 °C.

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