CDCLVC1104PW datasheet(7/23 Pages) TI1

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80 % V OH -V OL

CLKIN

20 % V OH -V OL

VOH

V OL

tPLH

V DD / 2

Y n

V DD / 2

CLKIN

tPHL

Note : tsk (p) = | tPLH – t PHL |

CDCLVC11xx

www.ti.com

SCAS895 – MAY 2010

PARAMETERS MEASUREMENT INFORMATION (continued)

Figure 6. Pulse Skew tsk(p) and Propagation Delay

Figure 7. Rise/Fall Times tr/tf

tPLH/tPHL

TYPICAL CHARACTERISTICS

Power Consideration

The following power consideration refers to the device-consumed power consumption only. The device power

consumption is the sum of static power and dynamic power. The dynamic power usage consists of two

components:

1. Power used by the device as it switches states.

2. Power required to charge any output load.

The output load can be capacitive only or capacitive and resistive. The following formula and the power graphs in

Figure 8 and Figure 9 can be used to obtain the power consumption of the device:

Pdev = Pstat + n (Pdyn + PCload)

Pstat = VDD x IDD

Pdyn + PCload = see Figure 8 and Figure 9

where:

VDD = Supply voltage (3.3 V or 2.5 V)

IDD = Static device current (typ 6 mA for VDD = 3.3 V; typ 3 mA for VDD = 2.5 V)

n = Number of switching output pins

Example for Device Power Consumption for CDCLVC1104: 4 outputs are switching, f = 120 MHz, VDD = 3.3 V

and Cload = 2 pF per output:

Pdev = Pstat + n (Pdyn + PCload) = 19.8 mW + 40 mW = 59.8 mW

Pstat = VDD x IDD = 6 mA x 3.3 V = 19.8 mW

n (Pdyn + PCload) = 4 x 10 mW = 40 mW

NOTE

For dimensioning the power supply, the total power consumption needs to be considered.

The total power consumption is the sum of the device power consumption and the power

consumption of the load.

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