LFEC10 datasheet(45/163 Pages) LATTICE

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3-9

DC and Switching Characteristics

Lattice Semiconductor

LatticeECP/EC Family Data Sheet

BLVDS

The LatticeECP/EC devices support BLVDS standard. This standard is emulated using complementary LVCMOS

outputs in conjunction with a parallel external resistor across the driver outputs. BLVDS is intended for use when

multi-drop and bi-directional multi-point differential signaling is required. The scheme shown in Figure 3-2 is one

possible solution for bi-directional multi-point differential signals.

Figure 3-2. BLVDS Multi-point Output Example

Table 3-2. BLVDS DC Conditions

Over Recommended Operating Conditions

Typical

Parameter

Description

Zo = 45

Zo = 90

Units

ZOUT

Output impedance

100

ohm

RTLEFT

Left end termination

ohm

RTRIGHT

Right end termination

ohm

VOH

Output high voltage

1.375

1.48

VOL

Output low voltage

1.125

1.02

VOD

Output differential voltage

0.25

0.46

VCM

Output common mode voltage

1.25

IDC

DC output current

11.2

10.2

1. For input buffer, see LVDS table.

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

2.5V

45-90 ohms

2.5V

. . .

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