XC9536XV-5PC44C

The XC9536XV-5PC44C is a 2.5V CPLD targeted for high-performance, low-voltage applications in leading-edge communications and computing systems. It is comprised of two 54V18 Function Blocks, providing 800 usable gates with propagation delays of 5 ns. See Figure 2 for architecture overview.

Power dissipation in CPLDs can vary substantially depending on the system frequency, design application and output loading. To help reduce power dissipation, each macrocell in a XC9500XV device may be configured for low-power mode (from the default high-performance mode). In addition, unused product-terms and macrocells are automatically deactivated by the software to further conserve power. For a general estimate of ICC, the following equation may be used:

PTOTAL = PINT + PIO = ICCINT x VCCINT + PIO

Separating internal and I/O power here is convenient because XC9500XV CPLDs also separate the corresponding power pins. PIO is a strong function of the load capacitance driven, so it is handled by I = CVf. ICCINT is another situation that reflects the actual design considered and the internal switching speeds. An estimation expression for ICCINT (taken from simulation) is:

ICCINT(mA) = MCHS(0.122 X PTHS + 0.238) + MCLP(0.042 x PTLP + 0.171) + 0.04(MCHS + MCLP) x fMAX x MCTOG 

where:
MCHS = # macrocells used in high speed mode
MCLP = #macrocells used in low power mode
PTHS = average p-terms used per high speed macrocell
PTLP = average p-terms used over low power macrocell
fMAX = max clocking frequency in the device
MCTOG = % macrocells toggling on each clock (12% is frequently a good estimate
This calculation was derived from laboratory measurements of an XC9500XV part filled with 16-bit counters and allowing a single output (the LSB) to be enabled. The actual ICC value varies with the design application and should be verified during normal system operation.

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