LFEC datasheet(45/117 Pages) LATTICE

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3-9

DC and Switching Characteristics

Lattice Semiconductor

LatticeECP/EC Family Data Sheet

LVPECL

The LatticeECP/EC devices support differential LVPECL standard. This standard is emulated using complemen-

tary LVCMOS outputs in conjunction with a parallel resistor across the driver outputs. The scheme shown in

Figure 3-2 is one possible solution for point-to-point signals.

Figure 3-2. Differential LVPECL

Table 3-2. LVPECL DC Conditions

Over Recommended Operating Conditions

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

cal information at the end of this data sheet.

Parameter

Description

Typical

Units

ZOUT

Output impedance

100

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

85.7

ohm

IDC

DC output current

12.7

1. For input buffer, see LVDS table.

Transmission line, Zo = 100 ohm differential

100 ohms

Off-chip

3.3V

~150 ohms

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