LFEC10 datasheet(47/163 Pages) LATTICE

47 / 163 page

3-11

DC and Switching Characteristics

Lattice Semiconductor

LatticeECP/EC Family Data Sheet

RSDS

The LatticeECP/EC 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. Use LVDS25E mode with suggested resistors for RSDS operation. Resistor 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

ohm

Driver series resistor

294

ohm

Driver parallel resistor

121

ohm

Receiver termination

100

ohm

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

ohm

IDC

DC output current

3.66

100

294

On-chip

Emulated

RSDS Buffer

VCCIO = 2.5V

Zo = 100

121

Off-chip

LFEC10 Datasheet(PDF) 47 Page - Lattice Semiconductor

LFEC10 Datasheet(HTML) 47 Page - Lattice Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL