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AM652X Datasheet(PDF) 146 Page - Texas Instruments

No. de pieza AM652X
Descripción Electrónicos  Sitara Processors
PDF  299 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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AM652X Datasheet(HTML) 146 Page - Texas Instruments

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OSC1_XI
CK0
CK1
CK1
VSS
Device
OSC1_XO
OSC1_XI
NC
SPRSP08_CLK_01
PCB Ground
146
AM6548, AM6528, AM6546
AM6526, AM6527
SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018
www.ti.com
Submit Documentation Feedback
Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527
Specifications
Copyright © 2017–2018, Texas Instruments Incorporated
5.11.4.1.4 Auxiliary OSC1 LVCMOS Digital Clock Source
Figure 5-18 shows the recommended oscillator connections when OSC1 is connected to an LVCMOS
square-wave digital clock source The 1.8-V LVCMOS-Compatible clock source is connected to the
OSC1_XI pin. In this mode of operation, the OSC1_XO pin is left unconnected and should not be used to
source any external components.
Figure 5-18. 1.8-V LVCMOS-Compatible Clock Input
Table 5-22 summarizes the OSC1 input clock electrical characteristics.
Table 5-22. OSC1 Switching Characteristics – Crystal Mode
NAME
DESCRIPTION
MIN
TYP
MAX
UNIT
f
Frequency
19.2, 20, 24, 25, 26, 27
MHz
CIN
Input capacitance
2.184
2.384
2.584
pF
IIN
Input current (3.3V mode)
4
6
10
µA
Table 5-23 details the OSC1 input clock timing requirements.
Table 5-23. OSC1 Input Clock Timing Requirements
NAME
DESCRIPTION
MIN
TYP
MAX
UNIT
CK0
1 / tc(OSC1_XI)
Frequency, OSC1_XI
19.2, 20, 24, 25, 26, 27
MHz
CK1
tw(OSC1_XI)
Pulse duration, OSC1_XI low or high
0.45 ×
tc(OSC1_XI)
0.55 ×
tc(OSC1_XI)
ns
tj(OSC1_XI)
Period jitter, OSC1_XI
0.01 ×
tc(OSC1_XI)
ns
tR(OSC1_XI)
Rise time, OSC1_XI
5
ns
tF(OSC1_XI)
Fall time, OSC1_XI
5
ns
tj(OSC1_XI)
Frequency accuracy, OSC1_XI
Ethernet RGMII and RMII
not used
±100
ppm
Ethernet RGMII and RMII
using derived clock
±50
Figure 5-19. OSC1_XI Input Clock



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