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IDT5V49EE901
EEPROM PROGRAMMABLE CLOCK GENERATOR
CLOCK SYNTHESIZER
IDT EEPROM PROGRAMMABLE CLOCK GENERATOR
12
IDT5V49EE901
REV R 092412
SEL[2:0] Function
The IDT5V49EE901 can support up to six unique
configurations. Users may pre-programmed all these
configurations, and select the configurations using SEL[2:0]
pins. Alternatively, users may use I2C interface to configure
these registers on-the-fly.
Crystal/Clock Selection
XTCLKSEL bit is used to bypass a crystal oscillator circuit
when external clock source is used.
PRIMSRC bit is used to select a primary clock from
XIN/REF and CLKIN.
SD/OE Pin Function
The polarity of the SD/OE signal pin can be programmed to
be either active HIGH or LOW with the SP bit (0x02). When
SP is “0” (default), the pin becomes active LOW and when
SP is “1”, the pin becomes active HIGH. The SD/OE pin can
be configured as either to shutdown the PLLs or to
enable/disable the outputs
Configuration OUTx IO Standard
Users can configure the individual output IO standard from
a single 3.3V power supply. Each output can support 3.3V
LVTTL. Each output pair can support LVDS, LVPECL or
HCSL. OUT0 can only be 3.3V single-ended output.
SEL2
SEL1
SEL0
Configuration Selections
0
Select CONFIG0
0
1
Select CONFIG1
0
1
0
Select CONFIG2
0
1
Select CONFIG3
1
0
Select CONFIG4
1
0
1
Select CONFIG5
1
0
Reserved (Do not use)
1
Reserved (Do not use)
PRIMSRC bit
Primary
Secondary
0XIN/REF
CLKIN
1
CLKIN
XIN/REF
CLKSEL input
0
1
CLKSEL
PRIMSRC Reference Clock
0
XIN/REF
01
CLKIN
10
CLKIN
1
XIN/REF
Clock Source
Primary Clock Source
Secondary Clock Source
SMx[1:0] Swithcing Mode
Primary to
Secondary
Secondary to
Primary
0x
Manual
No
10
Auto
Yes
No
11
Auto-Revertive
Yes
OUTn
OS
OE
SP
SD/OE Input
SH
Global Shutdown
Truth Table
SH bit SP bit OSn bit OEn bit SD/OE
OUTn
0
x
High-Z
2
0
1
0
x
Enabled
0
1
0
Enabled
0
1
Suspended
0
1
0
x
High-Z
2
0
1
0
x
Enabled
0
1
0
Suspended
0
1
Enabled
1
0
x
0
High-Z
2
1
0
1
0
Enabled
1
0
1
0
Enabled
1
0
x
0
High-Z
2
1
0
Enabled
1
0
Suspended
1x
x
1
Suspended
1
Note 1 : Global Shutdown
Note 2 : Hi-Z regardless of OEM bits
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