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SX-A Family FPGAs
v5.1
2-25
Table 2-20 • A54SX08A Timing Characteristics
(Worst-Case Commercial Conditions VCCA = 2.25 V, VCCI = 4.75 V, TJ = 70°C)
Parameter
Description
–2 Speed
–1 Speed
Std. Speed
–F Speed
Units
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
5 V PCI Output Module Timing1
tDLH
Data-to-Pad Low to High
2.4
2.8
3.2
4.5
ns
tDHL
Data-to-Pad High to Low
3.2
3.6
4.2
5.9
ns
tENZL
Enable-to-Pad, Z to L
1.5
1.7
2.0
2.8
ns
tENZH
Enable-to-Pad, Z to H
2.4
2.8
3.2
4.5
ns
tENLZ
Enable-to-Pad, L to Z
3.5
3.9
4.6
6.4
ns
tENHZ
Enable-to-Pad, H to Z
3.2
3.6
4.2
5.9
ns
dTLH
2
Delta Low to High
0.016
0.02
0.022
0.032
ns/pF
dTHL
2
Delta High to Low
0.03
0.032
0.04
0.052
ns/pF
5 V TTL Output Module Timing3
tDLH
Data-to-Pad Low to High
2.4
2.8
3.2
4.5
ns
tDHL
Data-to-Pad High to Low
3.2
3.6
4.2
5.9
ns
tDHLS
Data-to-Pad High to Low—low slew
7.6
8.6
10.1
14.2
ns
tENZL
Enable-to-Pad, Z to L
2.4
2.7
3.2
4.5
ns
tENZLS
Enable-to-Pad, Z to L—low slew
8.4
9.5
11.0
15.4
ns
tENZH
Enable-to-Pad, Z to H
2.4
2.8
3.2
4.5
ns
tENLZ
Enable-to-Pad, L to Z
4.2
4.7
5.6
7.8
ns
tENHZ
Enable-to-Pad, H to Z
3.2
3.6
4.2
5.9
ns
dTLH
Delta Low to High
0.017
0.017
0.023
0.031
ns/pF
dTHL
Delta High to Low
0.029
0.031
0.037
0.051
ns/pF
dTHLS
Delta High to Low—low slew
0.046
0.057
0.066
0.089
ns/pF
Notes:
1. Delays based on 50 pF loading.
2. To obtain the slew rate, substitute the appropriate Delta value, load capacitance, and the VCCI value into the following equation:
Slew Rate [V/ns] = (0.1*VCCI – 0.9*VCCI)/ (Cload * dT[LH|HL|HLS])
where Cload is the load capacitance driven by the I/O in pF
dT[LH|HL|HLS] is the worst case delta value from the datasheet in ns/pF.
3. Delays based on 35 pF loading.
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