SX Family FPGAs
v3.2
1-27
Dedicated (Hardwired) Array Clock Network
tHCKH
Input LOW to HIGH (pad to R-Cell input)
1.2
1.4
1.5
1.8
ns
tHCKL
Input HIGH to LOW (pad to R-Cell input)
1.2
1.4
1.6
1.9
ns
tHPWH
Minimum Pulse Width HIGH
1.4
1.6
1.8
2.1
ns
tHPWL
Minimum Pulse Width LOW
1.4
1.6
1.8
2.1
ns
tHCKSW
Maximum Skew
0.2
0.3
ns
tHP
Minimum Period
2.7
3.1
3.6
4.2
ns
fHMAX
Maximum Frequency
350
320
280
240
MHz
Routed Array Clock Networks
tRCKH
Input LOW to HIGH (light load)
(pad to R-Cell input)
1.61.8
2.12.5
ns
tRCKL
Input HIGH to LOW (light load)
(pad to R-Cell input)
1.82.0
2.32.7
ns
tRCKH
Input LOW to HIGH (50% load)
(pad to R-Cell input)
1.82.1
2.52.8
ns
tRCKL
Input HIGH to LOW (50% load)
(pad to R-Cell input)
2.02.2
2.53.0
ns
tRCKH
Input LOW to HIGH (100% load)
(pad to R-Cell input)
1.82.1
2.42.8
ns
tRCKL
Input HIGH to LOW (100% load)
(pad to R-Cell input)
2.02.2
2.53.0
ns
tRPWH
Min. Pulse Width HIGH
2.1
2.4
2.7
3.2
ns
tRPWL
Min. Pulse Width LOW
2.1
2.4
2.7
3.2
ns
tRCKSW
Maximum Skew (light load)
0.5
0.7
ns
tRCKSW
Maximum Skew (50% load)
0.5
0.6
0.7
0.8
ns
tRCKSW
Maximum Skew (100% load)
0.5
0.6
0.7
0.8
ns
TTL Output Module Timing3
tDLH
Data-to-Pad LOW to HIGH
1.6
1.9
2.1
2.5
ns
tDHL
Data-to-Pad HIGH to LOW
1.6
1.9
2.1
2.5
ns
tENZL
Enable-to-Pad, Z to L
2.1
2.4
2.8
3.2
ns
tENZH
Enable-to-Pad, Z to H
2.3
2.7
3.1
3.6
ns
tENLZ
Enable-to-Pad, L to Z
1.4
1.7
1.9
2.2
ns
tENHZ
Enable-to-Pad, H to Z
1.3
1.5
1.7
2.0
ns
Table 1-18 A54SX16 Timing Characteristics (Continued)
(Worst-Case Commercial Conditions, VCCR = 4.75 V, VCCA ,VCCI = 3.0 V, TJ = 70°C)
Parameter
Description
'–3' Speed
'–2' Speed
'–1' Speed
'Std' Speed
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Units
Notes:
1. For dual-module macros, use tPD + tRD1 + tPDn, tRCO + tRD1 + tPDn, or tPD1 + tRD1 + tSUD, whichever is appropriate.
2. Routing delays are for typical designs across worst-case operating conditions. These parameters should be used for estimating
device performance.
Post-route timing analysis or simulation is required to determine actual worst-case performance. Post-route
timing is based on actual routing delay measurements performed on the device prior to shipment.
3. Delays based on 35 pF loading, except tENZL and tENZH. For tENZL and tENZH, the loading is 5 pF.