Data Sheet
June 1999
ORCA Series 2 FPGAs
Lucent Technologies Inc.
157
.
Timing Characteristics (continued)
Notes:
If the input buffer is placed in delay mode, the chip hold time to the nearest PFU latch is guaranteed to be 0 if the clock is routed using the
primary clock network; (TJ = all, VDD = all). It should also be noted that any signals routed on the clock lines or using the TRIDI buffers directly
from the input buffer do not get delayed at any time.
The delays for all input buffers assume an input rise/fall time of
≤1 V/ns.
Table 46B. OR2TxxB Programmable I/O Cell Timing Characteristics
OR2TxxA Commercial: VDD = 3.0 V to 3.6 V, 0 °C
≤ TA ≤ 70 °C; OR2TxxA Industrial: VDD = 3.0 V to 3.6 V, –40 °C ≤ TA ≤
+85 °C.
Parameter
Symbol
Speed
Unit
-7
-8
Min
Max
Min
Max
Inputs (TJ = 85 °C, VDD = min)
Input Rise Time
TR
—
500
—
500
ns
Input Fall Time
TF
—
500
—
500
ns
Pad to In Delay
PAD_IN_DEL
—
1.1
—
1.0
ns
Pad to Nearest PFU Latch Output
CHIP_LATCH
—
3.3
—
2.4
ns
Delay Added to General Routing
(input buffer in delay mode for
OR2T15B and smaller devices)
—
6.6
—
6.1
ns
Delay Added to General Routing
(input buffer in delay mode for
OR2T40B)
—
8.9
—
8.2
ns
Delay Added to Direct-FF Routing
(input buffer in delay mode for
OR2T15B and smaller devices)
—
6.4
—
6.0
ns
Delay Added to Direct-FF Routing
(input buffer in delay mode for
OR2T40B)
—
8.7
—
8.0
ns
Outputs (TJ = 85 °C, VDD = min, CL = 50 pF)
PFU CK to Pad Delay (DOUT[3:0] to
PAD):
Fast
Slewlim
Sinklim
DOUT_DEL(F)
DOUT_DEL(SL)
DOUT_DEL(SI)
—
2.8
3.6
8.3
—
2.5
3.3
8.0
ns
Output to Pad Delay (OUT[3:0] to
PAD):
Fast
Slewlim
Sinklim
OUT_DEL(F)
OUT_DEL(SL)
OUT_DEL(SI)
—
2.8
3.6
8.3
—
2.5
3.3
8.0
ns
3-state Enable Delay (TS[3:0] to
PAD):
Fast
Slewlim
Sinklim
TS_DEL(F)
TS_DEL(SL)
TS_DEL(SI)
—
3.0
3.8
9.1
—
2.7
3.4
8.7
ns