mcimx50 Freescale Semiconductor, Inc, mcimx50 Datasheet - Page 19

• Manufacturer Part Number: mcimx50
• Description: I.mx50 Applications Processors For Consumer Products
• Manufacturer: Freescale Semiconductor, Inc

4
This section provides the device and module-level electrical characteristics of the i.MX50 processor.
4.1
This section provides the chip-level electrical characteristics for the IC. See
to the individual tables and sections.
Freescale Semiconductor
WDOG_RST_B_DEB
XTAL/EXTAL
Table 7, “Absolute Maximum Ratings”
Table
Table
Table
Signal Name
Electrical Characteristics
8,
9,
10,
Chip-Level Conditions
“Thermal Resistance
“i.MX50 Operating Ranges”
“Interface Frequency”
These electrical specifications are preliminary. These specifications are not
fully tested or guaranteed at this early stage of the product life cycle.
Finalized specifications are published after thorough characterization and
device qualifications have been completed.
This output may be used to drive out the internal system reset signal to the system reset controller.
This is only intended for debug purposes.
These pins are the 24 MHz crystal driver as well as the external 24 MHz clock input.
If using these pins to directly drive a 24 MHz crystal:
If using these pins as a clock input from an external 24 MHz oscillator:
i.MX50 Applications Processors for Consumer Products, Rev. 0
• The user should tie a 24 MHz fundamental-mode crystal across XTAL and EXTAL.
• The crystal must be rated for a maximum drive level of 100 μW or higher.
• The recommended crystal ESR (equivalent series resistance) is 80 Ω or less.
• The crystal may be eliminated and EXTAL driven directly driven by the external oscillator. The
• In this configuration, the XTAL pin must be floated and the COSC_EN bit (bit 12 in the CCR
• Note there are strict jitter requirements if using an external oscillator in a USB application:
For these characteristics, see
clock signal level on EXTAL must swing from NVCC_SRTC to GND.
register in the Clock Control Module) must be cleared to put the on-chip oscillator circuit in
bypass mode which allows EXTAL to be externally driven.
< 50 ps peak-to-peak below 1.2 MHz and < 100 ps peak-to-peak above 1.2 MHz for the USB
PHY.
Table 5. Special Signal Considerations (continued)
Data”
Table 6. i.MX50 Chip-Level Conditions
NOTE
Remarks
Table 6
Topic appears …
Electrical Characteristics
on page 20
on page 20
on page 21
on page 22
for a quick reference
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