ICS853013AMT datasheet(8/17 Pages) ICST

8 / 17 page

853013AM

www.icst.com/products/hiperclocks.html

REV. A OCTOBER 19, 2005

Integrated

Circuit

Systems, Inc.

ICS853013

LOW SKEW, DUAL, 1-TO-3, DIFFERENTIAL-TO-

2.5V/3.3V/5V LVPECL/ECL FANOUT BUFFER

APPLICATION INFORMATION

Figure 1 shows how the differential input can be wired to accept

single ended levels. The reference voltage V_REF ~ V

CC/2 is

generated by the bias resistors R1, R2 and C1. This bias circuit

should be located as close as possible to the input pin. The ratio

FIGURE 1. SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT

WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS

of R1 and R2 might need to be adjusted to position the V_REF in

the center of the input voltage swing. For example, if the input

clock swing is only 2.5V and V

CC = 3.3V, V_REF should be 1.25V

and R2/R1 = 0.609.

VCC

V_REF

0.1u

Single Ended Clock Input

PCLK

nPCLK

INPUTS:

PCLK/nPCLK INPUT:

For applications not requiring the use of a differential input,

both the PCLK and nPCLK pins can be left floating. Though

not required, but for additional protection, a 1k

Ω resistor can

be tied from PCLK to ground.

LVCMOS CONTROL PINS:

All control pins have internal pull-ups or pull-downs; additional

resistance is not required but can be added for additional

protection. A 1k

Ω resistor can be used.

RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS

OUTPUTS:

LVPECL OUTPUT

All unused LVPECL outputs can be left floating. We

recommend that there is no trace attached. Both sides of the

differential output pair should either be left floating or

terminated.

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