XC4000 Datasheet, PDF (4/22 Pages) Xilinx, Inc – Third Generation Field-Programmable Gate Arrays

XC4000 Logic Cell Array Family
Global Buffer 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.
Description
Global Signal Distribution
From pad through primary buffer, to any clock K
From pad through secondary buffer, to any clock K
Speed Grade
Symbol
Device
T_PG
XC4003
XC4005
XC4006
XC4008
XC4010
XC4013
XC4025
T_SG
XC4003
XC4005
XC4006
XC4008
XC4010
XC4013
XC4025
-6
Max
7.8
8.0
8.2
8.6
9.0
10.0
17.0
8.8
9.0
9.2
9.6
10.0
11.0
18.0
-5
Max
5.8
6.0
6.2
6.6
7.0
8.0
15.0
6.8
7.0
7.2
7.6
8.0
9.0
16.0
-4
Max Units
5.1
ns
5.5
ns
5.7
ns
6.1
ns
6.5
ns
7.5
ns
14.5
ns
6.3
ns
6.7
ns
6.9
ns
7.3
ns
7.7
ns
8.7
ns
15.7
ns
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.
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
I going Low to L.L. going from resistive pull-up
High to active Low, (TBUF configured as open drain)
T going Low to L.L. going from resistive pull-up or
floating High to active Low, (TBUF configured as
open drain or active buffer with I = Low)
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 going High to L.L. going from Low to High,
pulled up by two resistors
PRELIMINARY
Speed Grade
Symbol
Device
T_IO1
XC4003
XC4005
XC4006
XC4008
XC4010
XC4013
XC4025
T_IO2
XC4003
XC4005
XC4006
XC4008
XC4010
XC4013
XC4025
T_ON
XC4003
XC4005
XC4006
XC4008
XC4010
XC4013
XC4025
T_OFF
All devices
T_PUS
XC4003
XC4005
XC4006
XC4008
XC4010
XC4013
XC4025
T_PUF
XC4003
XC4005
XC4006
XC4008
XC4010
XC4013
XC4025
-6
Max
8.8
10.0
10.6
11.1
11.7
13.0
20.0
9.3
10.5
11.1
11.6
12.2
13.5
23.5
10.7
12.0
12.6
13.2
13.8
15.1
23.0
3.0
24.0
26.0
28.0
30.0
32.0
36.0
52.0
11.6
12.0
13.0
14.0
15.0
17.0
24.0
-5
Max
6.2
7.0
7.5
8.0
8.5
9.5
16.5
6.7
7.5
8.0
8.5
9.0
10.0
20.0
9.0
10.0
10.5
11.0
11.5
12.6
20.5
2.0
20.0
22.0
24.0
26.0
28.0
32.0
48.0
9.0
10.0
11.0
12.0
13.0
15.0
22.0
-4
Max
4.4
5.5
6.0
6.5
7.0
7.5
14.5
5.0
6.0
6.5
7.0
7.5
8.0
18.0
7.2
8.0
8.5
9.0
9.5
11.1
19.0
1.8
14.0
16.0
18.0
20.0
22.0
26.0
42.0
7.0
8.0
9.0
10.0
11.0
13.0
20.0
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
2-50