LFSC3GA25E-5FN900I View Datasheet(PDF) - Lattice Semiconductor

Part Name

Description

Manufacturer

LFSC3GA25E-5FN900I

LatticeSC/M Family Data Sheet Introduction

Lattice Semiconductor 

Lattice Semiconductor

DC and Switching Characteristics

LatticeSC/M Family Data Sheet

BLVDS

The LatticeSC devices support BLVDS standard. This standard is emulated using controlled impedance comple-

mentary 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

2.5V

100

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

45-90 ohms, +/- 1%

45-90 ohms, +/- 1%

2.5V

100

2.5V

100

+

-

...

2.5V

100

2.5V

100

+-

2.5V

100

2.5V

100

+-

2.5V

100

+

-

Table 3-2. BLVDS DC Conditions1

Over Recommended Operating Conditions

Symbol

Description

ZOUT

Output impedance

RTLEFT

Left end termination

RTRIGHT

Right end termination

VOH

Output high voltage

VOL

Output low voltage

VOD

Output differential voltage

VCM

Output common mode voltage

IDC

DC output current

1. For input buffer, see LVDS table.

Nominal

Zo = 45 Zo = 90

100

100

45

90

45

90

1.375

1.48

1.125

1.02

0.25

0.46

1.25

1.25

11.2

10.2

Units

ohm

ohm

ohm

V

V

V

V

mA

3-9

Share Link: