ST8034T datasheet(19/39 Pages) STMICROELECTRONICS

19 / 39 page

Electrical characteristics

ST8034T, ST8034AT, ST8034P, ST8034C

20/40

DocID024587 Rev 4

Table 10. Clock circuits

Symbol

Parameter

Test conditions(1)

Min.

Typ.

Max.

Unit

Input for external clock (CLKIN pin - ST8034P, ST8034C)

VIL

Input voltage low

-0.3

0.3

VDD(INTF)

VIH

Input voltage high

0.7

VDD(INTF)

+ 0.3

IIL

Input current low

VIL = 0 V

A

IIH

Input current high

VIH = VDD(INTF)

A

tR(I)

Input rise time

VIL max. to VIH min.

tF(I)

Input fall time

VIL max. to VIH min.

fCLKIN

External clock frequency

External clock on CLKIN pin

0.032

MHz

Internal oscillator

fOSC(INT)LOW

Internal oscillator frequency

Shutdown mode

100

150

200

kHz

fOSC(INT)

Active state

2.7

3.2

MHz

Crystal oscillator (XTAL1 and XTAL2 pins)

CEXT

External capacitances

XTAL1 and XTAL2 to GND

(according to the crystal or

resonator specification)

fXTAL

External crystal frequency

Card clock reference, crystal

oscillator

226

MHz

fEXT

External clock frequency

External clock on XTAL1

0.032

MHz

tR(fEXT)

External clock frequency rise

time

External clock on XTAL1

tF(fEXT)

External clock frequency fall

time

External clock on XTAL1

VIL

Input voltage low

Crystal oscillator

-0.3

0.3 VDD

External clock on XTAL1

-0.3

0.3

VDD(INTF)

VIH

Input voltage high

Crystal oscillator

0.7 VDD

VDD +

0.3

External clock on XTAL1

0.7

VDD(INTF)

+ 0.3

1. TA = 25 °C, VDD = 3.3 V, VDDP = 5 V, VDD(INTF) = 3.3 V, fXTAL = 10 MHz, unless otherwise noted.

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