LCMXO256 Lattice Semiconductor Corp., LCMXO256 Datasheet - Page 37

• Manufacturer Part Number: LCMXO256
• Description: Machxo Family Data Sheet
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
For further information on LVPECL, BLVDS and other differential interfaces please see details of additional techni-
cal documentation at the end of the data sheet.
RSDS
The MachXO family supports the differential RSDS standard. The output standard is emulated using complemen-
tary LVCMOS outputs in conjunction with a parallel resistor across the driver outputs on all the devices. The RSDS
input standard is supported by the LVDS differential input buffer on certain devices. 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
VCCIO = 2.5V
8mA
8mA
VCCIO = 2.5V
RSDS Buffer
Emulated
Z
R
R
R
V
V
V
V
Z
I
On-chip
DC
OUT
OH
OL
OD
BACK
S
P
T
CM
Parameter
Off-chip
Output impedance
Driver series resistor
Driver parallel resistor
Receiver termination
Output high voltage
Output low voltage
Output differential voltage
Output common mode voltage
Back impedance
DC output current
294
294
Description
121
3-11
Zo = 100
DC and Switching Characteristics
Typical
101.5
1.35
1.15
0.20
1.25
3.66
294
121
100
20
Off-chip
MachXO Family Data Sheet
Units
100
ohm
ohm
ohm
ohm
ohm
mA
V
V
V
V
On-chip
+
-