CDCE62005 datasheet(37/76 Pages) TI

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External Control Pins

CDCE62005

www.ti.com........................................................................................................................................................................................... SCAS862 – NOVEMBER 2008

Table 14. CDCE62005 Device State Definitions (continued)

Status

State

Device Behavior

Entered Via

Exited Via

Output

SPI Port

PLL

Divider

Buffer

Used to shut down all hardware and

Power_Down pin is pulled LOW.

Power_Down pin is pulled HIGH.

Disabled

Resets the device after exiting the

Power

Power Down State. Therefore, the

Down

EEPROM contents will eventually be

copied into RAM after the Power

Down State is exited.

Identical to the Power Down State

Sleep bit in device register 8 bit 7 is

Sleep bit in device register 8 bit 7 is set

Disabled

Sleep

except the EEPROM contents are

set LOW.

HIGH.

not copied into RAM.

Sync synchronizes all output

Sync Bit in device register 8 bit 8 is

Sync Bit in device register 8 bit 8 is set

Enabled

Disabled

dividers so that they begin counting

set LOW or Sync pin is pulled LOW

HIGH or Sync pin is pulled HIGH

at the same time. Note: this

Sync

operation is performed automatically

each time a divider register is

accessed.

REF_SEL

REF_SEL provides a way to switch between the primary and secondary reference inputs (PRI_IN and SEC_IN)

via an external signal. It works in conjunction with the smart multiplexer discussed in the Input Block section.

Power_Down

The Power_Down pin places the CDCE62005 into the power down state . Additionally, the CDCE62005 loads

the contents of the EEPROM into RAM after the Power_Down pin is de-asserted; therefore, it is used to initialize

the device after power is applied. SPI_LE signal has to be HIGH in order for EEPROM to load correctly during

the rising edge of Power_Down.

SYNC

The SYNC pin (Active LOW) has a complementary register location located in Device Register 8 bit 8. When

enabled, Sync synchronizes all output dividers so that they begin counting simultaneously. Further, SYNC

disables all outputs when in the active. State.

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