PXA270 datasheet(61/126 Pages) INTEL

61 / 126 page

Electrical, Mechanical, and Thermal Specification

5-11

Intel® PXA270 Processor

Electrical Specifications

5.5.2

13.000-MHz Oscillator Specifications

The 13.000-MHz oscillator is connected between the PXTAL_IN (amplifier input) and

PXTAL_OUT (amplified output). Table 5-11 and Table 5-12 list the 13.000-MHz specifications.

To drive the 13.000-MHz crystal pins from an external source:

1. Drive the PXTAL_IN pin with a digital signal with low and high levels as listed in Table 5-12.

Do not exceed VCC_PLL or go below VSS_PLL by more than 100 mV. The minimum slew

rate is 1 volt / 100 ns. The maximum current drawn from the external clock source when the

clock is at its maximum positive voltage typically is 1 mA.

2. Float the PXTAL_OUT pin or drive it in complement to the PXTAL_IN pin, with the same

voltage level, slew rate, and input current restrictions.

Caution: The PXTAL_IN and PXTAL_OUT pins must not be driven from an external source if the PXA270

processor sleep / deep sleep DC-DC converter is enabled.

Table 5-10. Typical External 32.768-kHz Oscillator Requirements

Symbol

Description

Min

Typical

Max

Units

Amplifier Specifications

VIH_X

Input high voltage, TXTAL_IN

0.99

1.10

1.21

VIL_X

Input low voltage, TXTAL_IN

–0.10

0.00

0.10

IIN_XT

Input leakage, TXTAL_IN

—

µA

CIN_XT

Input capacitance, TXTAL_IN/

TXTAL_OUT

—

tS_XT

Stabilization time

—

Board Specifications

RP_XT

Parasitic resistance, TXTAL_IN/

TXTAL_OUT to any node

—

Ω

CP_XT

Parasitic capacitance, TXTAL_IN/

TXTAL_OUT, total

—

COP_XT

Parasitic shunt capacitance,

TXTAL_IN to TXTAL_OUT

—

0.4

Table 5-11. Typical 13.000-MHz Crystal Requirements

Parameter

Minimum

Typical

Maximum

Units

Frequency range

12.997

13.000

13.002

MHz

Frequency tolerance at 25

°C

–50

—

+50

ppm

Oscillation mode

—

Fnd

—

Maximum change over temperature range

–50

—

+50

ppm

Drive level

—

100

Load capacitance (CL)—

—

Maximum series resistance (RS)—

—

Ω

Aging per year, at operating temperature

—

±5.0

ppm

PXA270 Datasheet(PDF) 61 Page - Intel Corporation

PXA270 Datasheet(HTML) 61 Page - Intel Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL