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LFEC Datasheet(PDF) 46 Page - Lattice Semiconductor

Part # LFEC
Description  LatticeECP/EC Family Data Sheet
PDF  117 Pages
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Manufacturer  LATTICE [Lattice Semiconductor]
Direct Link  http://www.latticesemi.com
Logo LATTICE - Lattice Semiconductor

LFEC Datasheet(HTML) 46 Page - Lattice Semiconductor

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3-10
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 scheme shown in Figure 3-3
is one possible solution for RSDS standard implementation. Use LVDS25E mode with suggested resistors for
RSDS operation. Resistor values in Figure 3-3 are industry standard values for 1% resistors.
Figure 3-3. RSDS (Reduced Swing Differential Standard)
Table 3-3. RSDS DC Conditions
5V Tolerant Input Buffer
The input buffers of the LatticeECP/EC family of devices can support 5V signals by using a PCI Clamp and an
external series resistor as shown in Figure 3-4.
Figure 3-4. 5 V Tolerant Input Buffer
Parameter
Description
Typical
Units
ZOUT
Output impedance
20
ohm
RS
Driver series resistor
294
ohm
RP
Driver parallel resistor
121
ohm
RT
Receiver termination
100
ohm
VOH
Output high voltage
1.35
V
VOL
Output low voltage
1.15
V
VOD
Output differential voltage
0.20
V
VCM
Output common mode voltage
1.25
V
ZBACK
Back impedance
101.5
ohm
IDC
DC output current
3.66
mA
100
294
294
On-chip
Emulated
RSDS Buffer
VCCIO = 2.5V
VCCIO = 2.5V
Zo = 100
+
-
121
Off-chip
External
Resistor
5V Signals from
Legacy Systems
VCCIO



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