A C T
™
2 F a m il y F P GA s
P ar am e t e r M ea s ur e m e nt
O ut put Buf f e r De lay s
E
D
TRIBUFF
PAD
To AC test loads (shown below)
V
CC
In
PAD
V
OL
t
DLH
50%
50%
V
OH
1.5 V
t
DHL
GND
1.5 V
E
PAD
V
CC
50%
V
CC
50%
1.5 V
V
OL
t
ENZL
t
ENLZ
GND
10%
E
PAD
GND
V
CC
50%
50%
V
OH
1.5 V
t
ENZH
t
ENHZ
GND
90%
A C T es t Lo ads
Load 1
(Used to measure propagation delay)
Load 2
(Used to measure rising/falling edges)
V
CC
GND
To the output under test
50 pF
To the output under test
R to V
CC
for t
PLZ
/t
PZL
R to GND for t
PHZ
/t
PZH
R = 1 kΩ
50 pF
Inp ut Bu ffer D ela ys
Modu le Del ay s
PAD
INBUF
Y
V
CC
S, A or B
S
A
B
Y
3V
PAD
Y
GND
t
INYH
1.5 V 1.5 V
V
CC
50%
t
INYL
0V
50%
Y
GND
Y
50% 50%
V
CC
50%
t
PLH
50%
t
PHL
GND
50%
t
PHL
V
CC
GND
t
PLH
50%
8
v4.0
ACTEL [ Actel Corporation ]
