
Data Sheet
June 1999
ORCA Series 2 FPGAs
Lucent Technologies Inc.
169
Measurement Conditions
Figure 74. ac Test Loads
5-3233(F).ar4
Figure 75. Output Buffer Delays
5-3235(F).a
Figure 76. Input Buffer Delays
50 pF
A. Load Used to Measure Propagation Delay
TO THE OUTPUT UNDER TEST
50 pF
VCC
GND
1 k
B. Load Used to Measure Rising/Falling Edges
VDD
TPHH
VDD/2
VSS
OUT[I]
PAD
OUT
1.5 V
0.0 V
TPLL
PAD
OUT[I]
ac TEST LOADS (SHOWN ABOVE)
TS[I]
OUT
0.0 V
1.5 V
TPHH
TPLL
PAD
IN[I]
IN
3.0 V
VSS
VDD/2
VDD
PAD IN
IN[I]