
Data Sheet
June 1999
ORCA Series 2 FPGAs
Lucent Technologies Inc.
169
Measurement Conditions
5-3234(F).r1
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
TO THE OUTPUT UNDER TEST
50 pF
V
CC
GND
1 k
B. Load Used to Measure Rising/Falling Edges
V
DD
V
DD
/2
V
SS
T
PHH
OUT[I]
PAD
OUT
1.5 V
0.0 V
T
PLL
PAD
OUT
OUT[I]
ac TEST LOADS (SHOWN ABOVE)
TS[I]
0.0 V
1.5 V
T
PHH
T
PLL
PAD
IN
IN[I]
3.0 V
V
SS
V
DD
/2
V
DD
PAD IN
IN[I]