LFSC datasheet(54/237 Pages) LATTICE

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3-10

DC and Switching Characteristics

Lattice Semiconductor

LatticeSC/M Family Data Sheet

LVPECL

The LatticeSC devices support differential LVPECL standard. This standard is emulated using controlled imped-

ance complementary LVCMOS outputs in conjunction with a parallel resistor across the driver outputs. The scheme

shown in Figure 3-3 is one possible solution for point-to-point signals.

Figure 3-3. Differential LVPECL

Table 3-3. LVPECL DC Conditions

Over Recommended Operating Conditions

For further information on LVPECL, BLVDS, MLVDS and other differential interfaces please see details of additional

technical documentation at the end of this data sheet.

On-die Differential Common Mode Termination

Symbol

Description

Nominal

Units

ZOUT

Output impedance

ohm

Driver series resistor

ohm

Driver parallel resistor

150

ohm

Receiver termination

100

ohm

VOH

Output high voltage

2.03

VOL

Output low voltage

1.27

VOD

Output differential voltage

0.76

VCM

Output common mode voltage

1.65

ZBACK

Back impedance

ohm

IDC

DC output current

12.6

1. For input buffer, see LVDS table.

Symbol

Description

Min.

Typ.

Max.

Units

CCMT

Capacitance VCMT to GND

—

Transmission line, Zo = 100 ohm differential

100

ohms

150

ohms

ON-chip

OFF-chip

3.3V

24mA

~16 ohms

24mA

~16 ohms

85 ohms

+/-1%

85 ohms

+/-1%

Zback

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