™
A C T
1
S e r i e s F P G A s
P a r a m e t e r M e a s u r e m e n t
O u t p u t B u ffe r De la y s
E
D
PAD To AC test loads (shown below)
TRIBUFF
V
V
V
CC
CC
CC
In
GND
1.5 V
50%
E
GND
E
50%
GND
50%
50%
CC
50%
50%
V
V
V
OH
OH
1.5 V
90%
PAD
PAD
PAD
1.5 V
10%
1.5 V
V
V
GND
OL
OL
t
t
t
t
t
t
ENHZ
DLH
DHL
ENZL
ENLZ
ENZH
AC T e s t Lo a d s
Load 1
Load 2
(Used to measure propagation delay)
(Used to measure rising/falling edges)
V
GND
CC
To the output under test
35 pF
R to V for t /t
CC
PLZ PZL
R to GND for t
/t
PHZ PZH
R = 1 kΩ
To the output under test
35 pF
In p u t B u ffe r De la y s
Mo d u le De la y s
S
Y
A
B
Y
PAD
INBUF
V
CC
GND
S, A or B
50% 50%
3 V
1.5 V
V
CC
PAD
0 V
1.5 V
50%
Out
50%
V
CC
GND
t
t
50%
PLH
PHL
Y
GND
50%
V
Out
CC
GND
50%
50%
t
t
INYL
INYH
t
t
PLH
PHL
1 -2 9 5
ACTEL [ Actel Corporation ]
