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AM6412...ALV Datasheet(PDF) 125 Page - Texas Instruments

Part # AM6412...ALV
Description  AM64x Sitara™ Processors
PDF  244 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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AM6412...ALV Datasheet(HTML) 125 Page - Texas Instruments

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Device
MCU_OSC0_XO
MCU_OSC0_XI
C
L1
Crystal
C
L2
AM65x_MCU_OSC_INT_01
PCB Ground
Figure 7-17. MCU_OSC0 Crystal Implementation
The crystal must be in the fundamental mode of operation and parallel resonant. Table 7-17 summarizes the
required electrical constraints.
Table 7-17. MCU_OSC0 Crystal Circuit Requirements
PARAMETER
MIN
TYP
MAX
UNIT
Fxtal
Crystal Parallel Resonance Frequency
25
MHz
Fxtal
Crystal Frequency Stability and Tolerance
Ethernet RGMII and RMII
not used
±100
ppm
Ethernet RGMII and RMII
using derived clock
±50
CL1+PCBXI
Capacitance of CL1 + CPCBXI
12
24
pF
CL2+PCBXO
Capacitance of CL2 + CPCBXO
12
24
pF
CL
Crystal Load Capacitance
6
12
pF
Cshunt
Crystal Circuit Shunt Capacitance
ESRxtal = 30 Ω
25 MHz
7
pF
ESRxtal = 40 Ω
25 MHz
5
pF
ESRxtal = 50 Ω
25 MHz
5
pF
ESRxtal
Crystal Effective Series Resistance
  (1)
Ω
(1)
The maximum ESR of the crystal is a function of the crystal frequency and shunt capacitance. See the Cshunt parameter.
When selecting a crystal, the system design must consider temperature and aging characteristics of the crystal
based on worst case environment and expected life expectancy of the system.
Table 7-18 details the switching characteristics of the oscillator.
Table 7-18. MCU_OSC0 Switching Characteristics - Crystal Mode
PARAMETER
MIN
TYP
MAX
UNIT
CXI
XI Capacitance
1.44
pF
CXO
XO Capacitance
1.52
pF
CXIXO
XI to XO Mutual Capacitance
0.01
pF
ts
Start-up Time
4
ms
www.ti.com
AM6442, AM6441, AM6421, AM6412, AM6411
SPRSP56D – JANUARY 2021 – REVISED JULY 2022
Copyright © 2022 Texas Instruments Incorporated
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Product Folder Links: AM6442 AM6441 AM6421 AM6412 AM6411



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