PI6C48543 datasheet(5/7 Pages) PERICOM

5 / 7 page

PI6C48543

3.3V Low Skew 1-to-4, 800MHz,

Differential to LVDS Fanout Buffer

PS8771B

10/02/08

AC Characteristics (TA = -40oC to 85oC, VCC = 3.135V to 3.465V)

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Units

fmax

Output Frequency

800

MHz

tPd

Propagation Delay(1)

f ≤ 800 MHz

1.0

2.2

Tsk(o)

Output-to-output Skew(2)

Tsk(pp)

Part-to-part Skew(3)

300

tr/tf

Output Rise/Fall time

20% - 80%

100

300

odc

Output duty cycle

Notes:

Measured from the differenital input crossing point to the differential output crossing point

Skew between outputs with the same supply voltage and equal load conditions. Measured at the differential outputs crossing point.

Skew between outputs on different parts operating with the same supply voltage and equal load conditions. Measured at the differential out-

puts crossing point.

All parameters are measured at 500 MHz unless noted otherwise

LVDS DC Characteristics (TA = -40oC to 85oC, VCC = 3.135V to 3.465V unless otherwise stated below.)

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Units

VOD

Differential Output Voltage

200

280

360

∆VOD

VOD Magnitude Change

VOS

Offset Voltage

1.125

1.25

1.375

∆VOS

VOS Magnitude Change

IOZ

High Impedance Leakage Current

-10

+10

μA

IOFF

Power OFF Leakage

-20

±1

+20

IOSD

Differential Output Short Circuit Current

-3.5

-5

IOS

Output Short Circuit Current

-3.5

-5

VOH

Output Voltage High

1.34

1.6

VOL

Output Voltage Low

0.9

1.06

Applications Information

Wiring the differential input to accept single ended levels

Figure 1 shows how the differential input can be wired to accept single ended levels. The reference voltage V_REF = VDD/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 of

R1 and R2 might need to be adjusted to postion the V_REF in the center of the input voltage swing. For example, if the input clock

swing is only 2.5V and VDD = 3.3V, V_REF should be 1.25V and R1/R2 = 0.609.

08-0247

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