SPC584BX datasheet(43/142 Pages) STMICROELECTRONICS

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DS11701 Rev 4

43/142

SPC584Bx

Electrical characteristics

4.11

Oscillators

4.11.1

Crystal oscillator 40 MHz

Table 21. External 40 MHz oscillator electrical specifications

Symbol

Parameter

Conditions

Value

Unit

Min

Max

fXTAL

Crystal Frequency

Range(1)

—4(2)

8MHz

>20

tcst

T Crystal start-up time (3),(4)

TJ = 150 °C

—

trec

Crystal recovery time(5)

——

0.5

VIHEXT

EXTAL input high

voltage(6) (External

Reference)

VREF = 0.29 * VDD_HV_OSC

VREF +

0.75

—V

VILEXT

EXTAL input low

voltage(6) (External

Reference)

VREF = 0.29 * VDD_HV_OSC

—VREF -

0.75

CS_EXTAL

Total on-chip stray

capacitance on EXTAL

pin(7)

—3

CS_XTAL

Total on-chip stray

capacitance on XTAL

pin(7)

—3

Oscillator

Transconductance

fXTAL 4 8MHz

freq_sel[2:0] = 000

3.9

13.6

mA/V

DfXTAL  5 - 10 MHz

freq_sel[2:0] = 001

517.5

DfXTAL  10  15 MHz

freq_sel[2:0] = 010

8.6

29.3

PfXTAL 15 - 20 MHz

freq_sel[2:0] = 011

14.4

DfXTAL  20 - 25 MHz

freq_sel[2:0] = 100

21.2

DfXTAL  25  30 MHz

freq_sel[2:0] = 101

DfXTAL 30 - 35 MHz

freq_sel[2:0] = 110

33.5

115

PfXTAL 35 - 40 MHz

freq_sel[2:0] = 111

33.5

115

VEXTAL

Oscillation Amplitude on

the EXTAL pin after

startup(8)

TJ = –40 °C to 150 °C

0.5

1.8

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