LCMXO2-256ZE-1SG32C datasheet(52/106 Pages) LATTICE

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3-13

DC and Switching Characteristics

MachXO2 Family Data Sheet

RSDS

The MachXO2 family supports the differential RSDS standard. The output standard is emulated using complemen-

tary LVCMOS outputs in conjunction with resistors across the driver outputs on all the devices. The RSDS input

standard is supported by the LVDS differential input buffer. The scheme shown in Figure 3-4 is one possible solu-

tion for RSDS standard implementation. Use LVDS25E mode with suggested resistors for RSDS operation. Resis-

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

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

Table 3-4. RSDS DC Conditions

Parameter

Description

Typical

Units

ZOUT

Output impedance

Ohms

Driver series resistor

294

Ohms

Driver parallel resistor

121

Ohms

Receiver termination

100

Ohms

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

Ohms

IDC

DC output current

3.66

100

294

On-chip

Off-chip

Emulated

RSDS Buffer

VCCIO = 2.5V

8mA

Zo = 100

121

Off-chip

LCMXO2-256ZE-1SG32C 数据表(PDF) 52 Page - Lattice Semiconductor

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