XC4000A Logic Cell Array Family
Horizontal Longline Switching Characteristic Guidelines
Testing of the switching parameters is modeled after testing methods specified by MIL-M-38510/605. All devices are 100% functionally
tested. Since many internal timing parameters cannot be measured directly, they are derived from benchmark timing patterns. The
following guidelines reflect worst-case values over the recommended operating conditions. For more detailed, more precise, and more
up-to-date timing information, use the values provided by the XACT timing calculator and used in the simulator.
Speed Grade
Description
TBUF
driving a Horizontal Longline (L.L.)
I going High or Low to L.L. going High or Low,
while T is Low, i.e. buffer is constantly active
Symbol
T
IO1
Device
XC4002A
XC4003A
XC4004A
XC4005A
XC4002A
XC4003A
XC4004A
XC4005A
XC4002A
XC4003A
XC4004A
XC4005A
All devices
XC4002A
XC4003A
XC4004A
XC4005A
XC4002A
XC4003A
XC4004A
XC4005A
-6
Max
8.2
8.8
9.4
10.0
8.7
9.3
9.9
10.5
10.1
10.7
11.4
12.0
3.0
23.0
24.0
25.0
26.0
10.5
11.0
11.5
12.0
-5
Max
6.0
6.2
6.6
7.0
6.5
6.7
7.1
7.5
8.4
9.0
9.5
10.0
2.0
19.0
20.0
21.0
22.0
8.5
9.0
9.5
10.0
-4
Max
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
I going Low to L.L. going from resistive pull-up
High to active Low, (TBUF configured as open drain)
T
IO2
T going Low to L.L. going from resistive pull-up
or floating High to active Low, (TUBF configured
as open drain)
T going High to TBUF going inactive, not driving L.L.
T going High to L.L. going from Low to High,
pulled up by a single resistor
T
ON
T
OFF
T
PUS
T going High to L.L. going from Low to High,
pulled up by two resistors
T
PUF
2-74
PRELIMINARY
4.4
5.5
5.0
6.0
7.2
8.0
1.8
14.0
16.0
7.0
8.0
XILINX [ XILINX, INC ]
