LCMXO2-256ZE-2TG100C datasheet(50/106 Pages) LATTICE

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3-11

DC and Switching Characteristics

MachXO2 Family Data Sheet

BLVDS

The MachXO2 family supports the BLVDS standard through emulation. The output is emulated using complemen-

tary LVCMOS outputs in conjunction with resistors across the driver outputs. The input standard is supported by

the LVDS differential input buffer. BLVDS is intended for use when multi-drop and bi-directional multi-point differen-

tial signaling is required. The scheme shown in Figure 3-2 is one possible solution for bi-directional multi-point dif-

ferential signals.

Figure 3-2. BLVDS Multi-point Output Example

Table 3-2. BLVDS DC Conditions

Over Recommended Operating Conditions

Symbol

Description

Nominal

Units

Zo = 45

Zo = 90

ZOUT

Output impedance

Ohms

Driver series resistance

Ohms

RTLEFT

Left end termination

Ohms

RTRIGHT

Right end termination

Ohms

VOH

Output high voltage

1.376

1.480

VOL

Output low voltage

1.124

1.020

VOD

Output differential voltage

0.253

0.459

VCM

Output common mode voltage

1.250

IDC

DC output current

11.236

10.204

1. For input buffer, see LVDS table.

Heavily loaded backplane, effective Zo ~ 45 to 90 ohms differential

2.5V

45-90 ohms

2.5V

. . .

16mA

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