Answers Database

2000L,3000L,3100L,4000L,4000XL: How do these 3.3V parts differ from their 5V counterparts?


Record #1907

Product Family:  Hardware

Product Line:  4000L

Problem Title:
2000L,3000L,3100L,4000L,4000XL: How do these 3.3V parts differ from
their 5V counterparts?



Problem Description:
Keywords:  3V, 3.3V, XC2000L, XC3000L, XC3100L, XC4000L,
	   XC4000XL, XC5200L

More and more Xilinx families are becomimg available in 3.3 V
versions, but not all Xilinx 3.3-V families are created equal.
Here are the details:

XC2000L is the same die as XC2000, but the "L"-version is
     bonded differently, to make the chip wake up with CMOS
     thresholds ( 50% of Vcc, vs TTL thresholds in XC2000 ).
     The low-voltage detector is around 2.5 V for all XC2000
     devices.

XC3000L is the same die as XC3000A, and
XC3100L is the same die as XC3100A,
     but the "L" versions are specially bonded to make two
     changes:
     The device wakes up with CMOS  input thresholds
     (50% of Vcc, vs TTL thresholds in XC3000A ), and the
     low-voltage detector kicks in at 2.5V (vs. 3.2V in the
     XC3000A ).

XC4000L is the same die as XC4000E, but the "L"-version is
     bonded differently, so that it wakes up with CMOS input
     thresholds.  Both XC4000E and XC4000L have the low-voltage
     detector @ 2.5 V.

XC4000XL is a new design, circuit details are different from
     XC4000EX.	Internal geometries are optimized for the 0.35
     micron process and 3.3-V operation. The I/O structure is
     completely redesigned to achieve 5-V tolerance.

XC5200L is the same die as XC5200, but the "L" versions are
     specially bonded to make three changes:
     The low-voltage detector kicks in at 2.2V (vs. 3.2V in the
     XC5200 ), and the device wakes up with CMOS input
     thresholds =50% of Vcc Inputs are 5-V tolerant if one of
     the Vcc pin (called Vtt ) is connected to the 5-V Vcc.
     This is a simpler structure than the one in XC4000XL.

Note that XC3100L and XC5200L use a continuously running
internal oscillator to generate an elevated voltage for driving
the pass-transistor gates , This is called "pumped gates" and
gives better speed, but results in significantly elevated idle
( quiescent ) current consumption, bad for battery-operated
systems. XC3100 devices have always used this technique, while
the original XC5200 devices did not, but the coming releases
will.



Solution 1:





End of Record #1907