iCE40LP1K-CM49TR Lattice, iCE40LP1K-CM49TR Datasheet - Page 21

• Manufacturer Part Number: iCE40LP1K-CM49TR
• Description: FPGA - Field Programmable Gate Array iCE40LP 1280 LUTs, 1.2V Ultra Low-Power
• Manufacturer: Lattice

Specifications of iCE40LP1K-CM49TR

• Rohs: yes

LVDS25E Emulation
iCE40 devices can support LVDSE outputs via emulation on all banks. The output is emulated using complemen-
tary LVCMOS outputs in conjunction with resistors across the driver outputs on all devices. The scheme shown in
Figure 3-1 is one possible solution for LVDS25E standard implementation. Resistor values in Figure 3-1 are indus-
try standard values for 1% resistors.
Figure 3-1. LVDS25E Using External Resistors
Table 3-1. LVDS25E DC Conditions
Output Pair
V
Differential
Z
R
R
R
V
V
V
V
Z
I
CCIO
DC
OUT
OH
OL
OD
BACK
T
CM
S
P
Parameter
Over Recommended Operating Conditions
R
R
s
s
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
1%
R
p
V
V
OUT_B
OUT_A
Description
Output common mode voltage
50%
3-8
DC and Switching Characteristics
V
OCM
iCE40 LP/HX Family Data Sheet
GND
100.5
Typ.
1.43
1.07
0.30
1.25
6.03
150
140
100
20
output voltage
Differential
Ohms
Ohms
Ohms
Ohms
Ohms
Units
mA
V
V
V
V
V
OD