ECP2 datasheet(67/386 Pages) LATTICE

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3-15

DC and Switching Characteristics

Lattice Semiconductor

LatticeECP2/M Family Data Sheet

RSDS

The LatticeECP2/M devices support differential RSDS standard. This standard is emulated using complementary

LVCMOS outputs in conjunction with a parallel resistor across the driver outputs. The RSDS input standard is sup-

ported by the LVDS differential input buffer. The scheme shown in Figure 3-4 is one possible solution for RSDS

standard implementation. Resistor values in Figure 3-4 are industry standard values for 1% resistors.

Figure 3-4. RSDS (Reduced Swing Differential Signaling)

Table 3-5. RSDS DC Conditions

Over Recommended Operating Conditions

Parameter

Description

Typical

Units

VCCIO

Output Driver Supply (+/-5%)

2.50

ZOUT

Driver Impedance

Driver Series Resistor (+/-1%)

294

Driver Parallel Resistor (+/-1%)

121

Receiver Termination (+/-1%)

100

VOH

Output High Voltage

1.35

VOL

Output Low Voltage

1.15

VOD

Output Differential Voltage

0.20

VCM

Output Common Mode Voltage

1.25

ZBACK

Back Impedance

101.5

IDC

DC Output Current

3.66

1. For input buffer, see LVDS table.

RS = 294 ohms

(+/-1%)

RS = 294 ohms

(+/-1%)

RP = 121 ohms

(+/-1%)

RT = 100 ohms

(+/-1%)

On-chip

8mA

VCCIO = 2.5V

(+/-5%)

VCCIO = 2.5V

(+/-5%)

Transmission line,

Zo = 100 ohm differential

Off-chip

ECP2 Datasheet(PDF) 67 Page - Lattice Semiconductor

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