LFXP3E-4TN100C Lattice, LFXP3E-4TN100C Datasheet - Page 296

• Manufacturer Part Number: LFXP3E-4TN100C
• Description: IC FPGA 3.1KLUTS 62I/O 100-TQFP
• Manufacturer: Lattice

Specifications of LFXP3E-4TN100C

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Lattice Semiconductor
Power Calculator Assumptions
Following are the assumptions made in the Power Calculator:
5. Reducing the voltage swing of the I/Os where possible.
6. Using optimum encoding where possible. For example, a 16-bit binary counter has, on average, only 12%
7. Minimize the operating temperature, by the following methods:
1. The Power Calculator tool is based on equations with constants based on room temperature of 25°C.
2. The user can define the Ambient Temperature (Ta) for device Junction Temperature (Tj) calculation based
3. The I/O power consumption is based on output loading of 5pF. Users have ability to change this capacitive
4. The current version of the Power Calculator allows users to get an estimate of the power dissipation and
5. The nominal V
6. The current versions also allows users to enter an airflow in Linear Feet per Minute (LFM) along with the
7. The default value of the I/O types for the LatticeEC and LatticeXP devices is LVCMOS12, 6mA.
8. The Activity Factor (AF) is defined as the toggle rate of the registered output. For example, assuming that
Activity Factor and a 7-bit binary counter has an average of 28% Activity Factor. On the other hand, a 7-bit
Linear Feedback Shift Register could toggle as much as 50% Activity Factor, which causes higher power
consumption. A gray code counter, where only one bit changes at each clock edge, will use the least
amount of power, as the Activity Factor would be less than 10%.
a. Use packages that can better dissipate heat. For example, packages with lower thermal impedance.
b. Place heat sinks and thermal planes around the device on the PCB.
c. Better airflow techniques using mechanical airflow guides and fans (both system fans and device
mounted fans).
on the power estimation. Tj is calculated from user-entered Ta and power calculation of typical room tem-
perature.
loading.
the current for each type of power supplies, that are V
I
Additional V
input buffers must be added per pair for differential buffers or per pin for reference input buffers according
to the user's design. See the equation given in this technical note for Total DC Power (I
higher V
LatticeECP/EC and LatticeXP families of devices.
Heat Sink option to calculate the Junction Temperature.
the input of a flip-flop is changing at every clock cycle, 100% AF of a flip-flop running at 100MHz is 50MHz.
CCAUX
values are provided in the Calculator.
CC
from a list of available values. For example, the nominal V
CCAUX
CC
is used by default to calculate the power consumption. Users can choose a lower or
contributions due to differential output buffers, differential input buffers and reference
12-19
for LatticeECP/EC and LatticeXP Devices
CC,
V
CCIO,
Power Estimation and Management
V
CCJ
CC
and V
of 1.2V is used by default for the
CCAUX.
For V
CCAUX
CCAUX,
).
only static