LCMXO2-640ZE-2TG100C datasheet(51/106 Pages) LATTICE

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3-12

DC and Switching Characteristics

MachXO2 Family Data Sheet

LVPECL

The MachXO2 family supports the differential LVPECL standard through emulation. This output standard is emu-

lated using complementary LVCMOS outputs in conjunction with resistors across the driver outputs on all the

devices. The LVPECL input standard is supported by the LVDS differential input buffer. The scheme shown in Dif-

ferential LVPECL 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 and other differential interfaces please see details of additional techni-

cal documentation at the end of the data sheet.

Symbol

Description

Nominal

Units

ZOUT

Output impedance

Ohms

Driver series resistor

Ohms

Driver parallel resistor

196

Ohms

Receiver termination

100

Ohms

VOH

Output high voltage

2.05

VOL

Output low voltage

1.25

VOD

Output differential voltage

0.80

VCM

Output common mode voltage

1.65

ZBACK

Back impedance

100.5

Ohms

IDC

DC output current

12.11

1. For input buffer, see LVDS table.

Transmission line, Zo = 100 ohm differential

100 ohms

93 ohms

16mA

93 ohms

Off-chip

On-chip

VCCIO = 3.3V

196 ohms

On-chip

Off-chip

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