參數(shù)資料
型號: LFEC40E-3F900C
廠商: LATTICE SEMICONDUCTOR CORP
元件分類: FPGA
英文描述: LatticeECP/EC Family Data Sheet
中文描述: FPGA, 5120 CLBS, PBGA900
封裝: 31 X 31 MM, FPBGA-900
文件頁數(shù): 46/117頁
文件大?。?/td> 557K
代理商: LFEC40E-3F900C
3-10
DC and Switching Characteristics
LatticeECP/EC Family Data Sheet
Lattice Semiconductor
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
Z
OUT
R
S
R
P
R
T
V
OH
V
OL
V
OD
V
CM
Z
BACK
I
DC
Description
Typical
20
294
121
100
1.35
1.15
0.20
1.25
101.5
3.66
Units
ohm
ohm
ohm
ohm
V
V
V
V
ohm
mA
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
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
V
CCIO
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