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CDCVF2505

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SCAS640G – JULY 2000 – REVISED AUGUST 2016

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9.4 Device Functional Modes

The device has two functional modes: active and power down.

The CDCVF2505 automatically switches from active to power down, and vice versa, when the detected CLKIN

reference frequency is low. The PLL automatically switches on and tries to lock to the reference clock as soon as

the input frequency exceeds 20 MHz (typical). The PLL switches off and tri-states the output buffers when the

input frequency goes below 12 MHz (typical).

(1)

Full device functionality is specified for frequencies equal to or higher

than 24 MHz. Below 1 MHz, the device goes in power-down mode in

which the PLL is turned off and the outputs enter into Hi-Z mode.

Table 1. Function Table

INPUT

OUTPUTS

CLKIN

1Y (0:3)

CLKOUT

L

L

L

H

H

H

Z

Z