CDCE72010 datasheet(7/70 Pages) TI

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TIMING REQUIREMENTS

CDCE72010

www.ti.com...................................................................................................................................................................................................... SCAS858 – JUNE 2008

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

MHz

SPI_MOSI to SPI_CLK setup time

SPI_MOSI to SPI_CLK hold time

SPI_CLK high duration

SPI_CLK low duration

SPI_LE to SPI_CLK setup time

SPI_CLK to SPI_LE setup time

SPI_LE pulse width

SPI_MISO to SPI_CLK data valid (first valid bit after LE)

PD, RESET, Hold, REF_SEL

Rise and fall time of the PD, RESET, Hold, REF_SEL signal from 20%

tr/tf

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affects the HOLD-Over-Function as well as the PLL_LOCK signal is no longer valid.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

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