![](http://datasheet.mmic.net.cn/200000/OR3T55-4BA256I_datasheet_15087465/OR3T55-4BA256I_121.png)
Preliminary Data Sheet, Rev. 1
September 1998
ORCA Series 3 FPGAs
Lucent Technologies Inc.
121
Timing Characteristics (continued)
Notes:
Shaded values are advance information and are valid for OR3Txxx devices only.
This clock delay is for a fully routed clock tree that uses the primary clock network. It includes both the input buffer delay, the clock routing to the
PIO CLK input, the clock
→Q of the FF, and the delay through the output buffer. The delay will be reduced if any of the clock branches are not
used. The given timing requires that the input clock pin be located at one of the four center PICs on any side of the device and that a PIO FF be
used. For clock pins located at any other PIO, see the results reported by ORCA Foundry.
Figure 74. System Clock to Output Delay
Table 55. OR3Cxx General System Clock (SCLK) to Output Delay (Pin-to-Pin)
OR3Cxx Commercial: VDD = 5.0 V ± 5%, 0 °C
< TA < 70 °C; Industrial: VDD = 5.0 V ± 10%, –40 °C < TA < +85 °C; CL = 50 pF.
OR3Txxx Commercial: VDD = 3.0 V to 3.6 V, 0 °C
< TA < 70 °C; Industrial: VDD = 3.0 V to 3.6 V, –40 °C < TA < +85 °C;
CL = 50 pF.
Description
(TJ = 85 °C, VDD = min)
Device
Speed
Unit
-4
-5
-6
Min
Max
Min
Max
Min
Max
Output On Same Side of Device As Input Clock (System Clock Delays Using General User I/O Inputs)
Clock Input Pin (mid-PIC)
→OUTPUT Pin (Fast)
OR3C/T55
OR3C/T80
OR3T125
—
12.92
13.39
TBD
—
10.47
10.81
TBD
—
8.78
9.03
TBD
ns
Clock Input Pin (mid-PIC)
→OUTPUT Pin (Slewlim)
OR3C/T55
OR3C/T80
OR3T125
—
15.36
15.83
TBD
—
12.46
12.79
TBD
—
10.10
10.36
TBD
ns
Clock Input Pin (mid-PIC)
→OUTPUT Pin (Sinklim)
OR3C/T55
OR3C/T80
OR3T125
—
16.72
17.19
TBD
—
13.81
14.14
TBD
—
11.48
11.74
TBD
ns
Additional Delay if Non-mid-PIC Used as Clock Pin
OR3C/T55
OR3C/T80
OR3T125
—
0.44
0.49
TBD
—
0.32
0.37
TBD
—
0.22
0.23
TBD
ns
Output Not on Same Side of Device As Input Clock (System Clock Delays Using General User I/O Inputs)
Additional Delay if Output Not on Same Side as Input
Clock Pin
OR3C/T55
OR3C/T80
OR3T125
—
0.60
0.65
TBD
—
0.40
0.45
TBD
—
0.29
0.33
TBD
ns
5-4846(F)
OUTPUT (50 pF LOAD)
Q
D
SCLK
PIO FF