DO-CPLD-DK-J-G Xilinx Inc, DO-CPLD-DK-J-G Datasheet - Page 16

• Manufacturer Part Number: DO-CPLD-DK-J-G
• Description: KIT STARTER CPLD JAPANESE
• Manufacturer: Xilinx Inc
• Series: CoolRunner™- IIr
• Type: CPLD Development Kitr

Specifications of DO-CPLD-DK-J-G

• Contents: Proto Board, Download Cable, Software and Documentation
• For Use With/related Products: CoolRunner-ll, XC9500XL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Thresholds
16
Drive Strength
Tjmax > (ThetaJC * Pd) + Ta
For example, if you want to know how many output loads you could drive that each
require 40 mA with one device, the selected device is XCR3064XL-PC44:
You will need to expand Pd to take into account Pd of the design and the I/O:
Pddesign is 66 mW from measurement; doubled to 132 mW for safety cushion.
When sourcing 40 mA, the voltage at the output of the CPLD will be 2.3V (information
obtained from the I/V curve).
You should have 644 mA to use to drive the I/O pins.
644 mA/40 mA = 16 output loads can be driven by this device before you exceed the
acceptable temperature range.
How many 40 mA output loads can the device sink?
When sinking 40 mA, the voltage at the output of the CPLD will be 0.7V.
You should have 2116 mA to use to drive the I/O pins.
2116 mA/40 mA = 53 LEDs can be driven by this device before before you exceed the
acceptable temperature range.
You cannot select the drive strength for CPLDs. The drive strength must be read from the
I/V curve.
(Pddesign + PdIO) = 1.613W
(X*2.3V) = 1.613W - 0.132W
X = 1.48W/2.3V
X = 0.644A
(X*0.7V) = 1.613W - 0.132W
X = 1.481W/0.7V
X = 2.12A
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Where Tjmax = Tamax of 70°C
ThetaJC is available in the Device Package User Guide (UG112)
Pd is the power dissipated (use XPower, or measure the design power)
Ta is the ambient temperature at which the device will run
Tjmax is 70°C for a plastic package
ThetaJC is 12.4°C/Watt for PC44 package
Ta will not exceed 50°C
70 = (12.4*Pd) + 50
Pd = 1.613W
www.xilinx.com
UG445 (v1.1) November 27, 2007
CPLD I/O User Guide
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