LFXP3C-3TN100I Lattice, LFXP3C-3TN100I Datasheet - Page 148
LFXP3C-3TN100I
Manufacturer Part Number
LFXP3C-3TN100I
Description
FPGA - Field Programmable Gate Array 3.1K LUTs 62 IO 1.8/ 2.5/3.3V -3 Spd I
Manufacturer
Lattice
Specifications of LFXP3C-3TN100I
Number Of Programmable I/os
62
Data Ram Size
55296
Supply Voltage (max)
3.465 V
Maximum Operating Temperature
+ 100 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Supply Voltage (min)
1.71 V
Package / Case
TQFP-100
Package
100TQFP
Family Name
LatticeXP
Device Logic Units
3000
Maximum Internal Frequency
320 MHz
Typical Operating Supply Voltage
1.8|2.5|3.3 V
Maximum Number Of User I/os
62
Ram Bits
55296
Re-programmability Support
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LFXP3C-3TN100I
Manufacturer:
Lattice Semiconductor Corporation
Quantity:
10 000
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Lattice Semiconductor
5V Interface with PCI Clamp Diode
All the I/Os on the top and bottom sides of the device (Banks 0, 1, 4, and 5) have a clamp diode that is used to
clamp the voltage at the input to V
used along with an external resistor to make an input 5V tolerant.
Figure 8-3. 5V Tolerant Input Buffer
The value of this external resistor will depend on the PCI clamp diode characteristics. You can find the voltage vs.
current data across this diode in the device IBIS model.
In order to interface to 5V input, it is recommended to set the V
Below is an example for calculating the value of this external resistor when V
• Maximum voltage at input pin, V
• Bank V
• Maximum voltage drop across clamp diode, V
• The current across the clamp diode at V
Table 8-5. Power Clamp Data from IBIS Model
• Assume the maximum output voltage of the driving device is V
power clamp portion of the IBIS file for a LVCMOS3.3 input model with PCI Clamp turned on. When V
clamp diode current is I
then be calculated as follows:
CCIO
= 2.75V
D
= 27.4mA.
INMAX
CCIO
5V Input
Voltage
-1.00
-0.80
-0.60
-1.40
-1.30
-1.20
-1.10
-0.90
-0.70
-0.50
-0.40
-0.30
-0.20
-0.10
0.00
. This is especially used for PCI I/O standards. This clamp diode can be
= 3.75V (see device data sheet for more details)
D
can be found in the power clamp data of the IBIS file. Below is the
D
= V
External
Resistor
INMAX
0.0009129
0.0001432
0.07917
I (Max.)
8-8
550.8
72.5
61.2
49.9
38.6
27.4
16.9
9.52
5.35
2.31
58.0
3.61
- V
CCIO
CCIO
EXT
V
= 3.75 - 2.75 =1V
between 2.5V to 3.3V.
= 5.25V. The value of the external resistor can
CCIO
Units
PCI Clamp
Diode
mA
mA
mA
mA
mA
mA
mA
mA
mA
µA
µA
µA
µA
µA
µA
CCIO
LatticeECP/EC and LatticeXP
is 2.75V.
sysIO Usage Guide
D
is 1V, the
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