QPRO High-Reliability QML Certified and Radiation Hardened Products for Aerospace and Defense
R
Speed Grades
When making a device selection in the implementation tools, always select a speed grade that
corresponds to the specific target device. In other words, a “-4” speed grade is still a “-4”
regardless of whether it is a Commercial, Industrial, or Military grade part.
The AC characteristics and guaranteed timing specifications for a given device are specified
per a specific speed grade. However, these parameters do not vary per product grade (i.e.,
Commercial, Industrial, Military, or other). Therefore, a Commercial grade device (C) of a
particular speed grade will have identical guaranteed worst case timing specifications as the
Industrial or Military version (I, M, B, or N) of the same part and same speed grade. However,
this is not the case for best case or minimum delay timing specifications.
Xilinx devices are assigned a speed grade based on the whether or not the device can pass all
the guaranteed worst case timing (maximum delays) for that speed grade. A device that does
not pass all AC parametric tests for the fastest speed grade classification may test successfully
for a slower speed grade classification and subsequently be assigned that grade. Therefore, a
faster device may be categorized to a slower speed grade as long as there aren’t any
associated guaranteed minimum timing delay specifications, or the part successfully meets
such specifications.
Industrial and Military grade devices are tested at a greater junction temperature range than
Commercial grade devices. The commercial range for junction temperature is 0°C to +85°C.
The industrial temperature range –40°C to +100°C, and the military range is –55°C to +125°C.
The military version of a specific device must meet the same timing specifications at +125°C as
the corresponding commercial version at +85°C (for a specific speed grade). For example, a
device that meets all timing specifications for a -6 speed grade at +85°C may only meet the
timing specifications for a -4 speed grade when tested at +125°C. Therefore, the commercial
grade devices will typically have an extended speed grade offering over the availability of
devices tested at extended temperature ranges.
Core and IP Support
Cores and IP modules developed for Commercial grade Xilinx devices may also be
implemented in Industrial and Military grade as well as Radiation Hardened devices. Device
architectures do vary across product grades. However, some cores may have been
characterized for speed grades that are unavailable in the extended temperature ranges.
Additionally, some cores, such as the Xilinx PCI Core Solution, have been characterized for
required minimum timing specifications. In such a case if the Core or IP module has not been
specifically characterized for the extended temperature range then it may not be guaranteed to
operate over the full temperature range of the device. However, such a core would operate
successfully within the temperature range for which it was characterized.
Standard
Microcircuit
Drawing (SMD)
Cross
Reference
XC1700 Products (Serial PROMS)
XC1700 Products
SMD Number
5962-9471701MPA
5962-9561701MPA
5962-9951401QXA
5962-9951401QYA
(Serial PROMS)
XC1765DDD8B
XC17256DDD8B
XQ1701LS020N
XQ1701LCC44B
Speed
Package
DD8
DD8
SO20
CC44
Mark Loc
TOP
TOP
TOP
TOP
June 15, 2000 (v2.1)
1-800-255-7778
1-3
XILINX [ XILINX, INC ]
