QL2003
3-13
AC CHARACTERISTICS at VCC = 5V, TA = 25
°°C (K = 1.00)
Propagation delays depend on routing, fanout, load capacitance, supply voltage, junction temperature,
and process variation. The AC Characteristics are a design guide to provide initial timing estimates at
nominal conditions. Worst case estimates are obtained when nominal propagation delays are multiplied
by the appropriate Delay Factor, K, as specified in the Delay Factor table (Operating Range). The
QuickChip/QuickTools/QuickWorks software incorporates data sheet AC Characteristics into the
design database for precise path analysis or simulation results following place and route.
Logic Cells
Input-Only Cells
Symbol
Parameter
Propagation Delays (ns)
Fanout [8]
1234
8
12
24
tIN
High Drive Input Delay
2.5
2.6
2.6
2.7
3.5
4.6
5.8
tINI
High Drive Input, Inverting Delay
2.6
2.7
2.7
2.8
3.6
4.7
5.9
tISU
Input Register Set-Up Time
4.8
4.8
4.8
4.8
4.8
4.8
4.8
tIH
Input Register Hold Time
0.0
0.0
0.0
0.0
0.0
0.0
0.0
tlCLK
Input Register Clock To Q
0.9
1.0
1.0
1.1
1.9
3.0
4.2
tlRST
Input Register Reset Delay
0.8
0.9
0.9
1.0
1.8
2.9
4.1
tlESU
Input Register clock Enable Set-Up Time
4.1
4.1
4.1
4.1
4.1
4.1
4.1
tlEH
Input Register Clock Enable Hold Time
0.0
0.0
0.0
0.0
0.0
0.0
0.0
Notes:
[8]
Stated timing for worst case Propagation Delay over process variation at VCC=5.0V and TA=25
°C.
Multiply by the appropriate Delay Factor, K, for speed grade, voltage and temperature settings as
specified in the Operating Range.
[9]
These limits are derived from a representative selection of the slowest paths through the pASIC 2 logic
cell including typical net delays. Worst case delay values for specific paths should be determined from
timing analysis of your particular design.
Symbol
Parameter
Propagation Delays (ns)
Fanout [8]
12
34
8
tPD
Combinatorial Delay [9]
1.4
1.7
2.0
2.3
3.5
tSU
Setup Time [9]
1.8
1.8
1.8
1.8
1.8
tH
Hold Time
0.0
0.0
0.0
0.0
0.0
tCLK
Clock to Q Delay
0.8
1.1
1.4
1.7
2.9
tCWHI
Clock High Time
2.0
2.0
2.0
2.0
2.0
tCWLO
Clock Low Time
2.0
2.0
2.0
2.0
2.0
tSET
Set Delay
1.4
1.7
2.0
2.3
3.5
tRESET
Reset Delay
1.2
1.5
1.8
2.1
3.3
tSW
Set Width
1.9
1.9
1.9
1.9
1.9
tRW
Reset Width
1.8
1.8
1.8
1.8
1.8
3
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