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CDCE72010RGCR Scheda tecnica(PDF) 7 Page - Texas Instruments

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Il numero della parte CDCE72010RGCR
Spiegazioni elettronici  Ten Output High Performance Clock Synchronizer, Jitter Cleaner, and Clock Distributor
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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TIMING REQUIREMENTS
CDCE72010
www.ti.com.............................................................................................................................................................. SCAS858A – JUNE 2008 – REVISED JULY 2009
over recommended ranges of supply voltage, load, and operating free-air temperature
(1) (2) (3) (4)
PARAMETER
MIN
TYP
MAX
UNIT
PRI_REF/SEC_REFIN
fREF - Single
For single-ended inputs ( LVCMOS) on PRI_REF and SEC_REF
250
MHz
For differential inputs (LVDS and LVPECL) on PRI_REF and
fREF - Diff
SEC_REF
500
MHz
(R divider set to DIV2)
Duty Cycle
60%
Duty cycle of PRI_REF or SEC_REF at VCC/2
40%
Single
Duty Cycle
Duty cycle of PRI_REF or SEC_REF at VCC/2
40%
60%
Diff
VCXO_IN, AUX_IN
fREF - Single
For single-ended inputs ( LVCMOS)
250
MHz
fREF - Diff
For differential inputs (LVDS and LVPECL)
1500
MHz
Duty Cycle
60%
Duty cycle of PRI_REF or SEC_REF at VCC/2
40%
Single
Duty Cycle
Duty cycle of PRI_REF or SEC_REF at VCC/2
40%
60%
Diff
SPI/Control (SPI Bus Timing)
fCTRL_CLK
CTRL_CLK frequency
20
MHz
t2
SPI_MOSI to SPI_CLK setup time
10
ns
t3
SPI_MOSI to SPI_CLK hold time
10
ns
t4
SPI_CLK high duration
25
ns
t5
SPI_CLK low duration
25
ns
t1
SPI_LE to SPI_CLK setup time
10
ns
t6
SPI_CLK to SPI_LE setup time
10
ns
t7
SPI_LE pulse width
20
ns
t8
SPI_MISO to SPI_CLK data valid (first valid bit after LE)
10
ns
PD, RESET, Hold, REF_SEL
Rise and fall time of the PD, RESET, Hold, REF_SEL signal from 20%
tr/tf
4
ns
to 80% of VCC
(1)
From 250MHz to 500MHz is achieved by setting the divide by 2 in P’
(2)
If the feedback clock (derived from the VCXO input) is less than 2MHz, the device stays in normal operation mode but the frequency
detection circuitry resets the STATUS_VCXO signal and PLL_LOCK signal to low. Both status signals are no longer relevant. This
affects the HOLD-Over-Function as well as the PLL_LOCK signal is no longer valid.
(3)
Use a square wave for lower frequencies (< 80 MHz).
(4)
Slew rate requirement
Copyright © 2008–2009, Texas Instruments Incorporated
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