a1440a Actel Corporation, a1440a Datasheet - Page 20

• Manufacturer Part Number: a1440a
• Description: Accelerator Series Fpgas
• Manufacturer: Actel Corporation

Output B uffe r Del ays
AC Test Loa ds
In p ut Bu ffer Delays
1-194
In
Out
V
OL
(Used to measure propagation delay)
To the output under test
50%
t
DHS,
In
Out
GND
V
PAD
CC
V
1.5 V
50%
OH
1.5 V
t
INY
Load 1
t
3 V
DHS,
INBUF
1.5 V
V
50%
GND
CC
1.5 V
t
INY
35 pF
0 V
Y
50%
En
Out
D
TRIBUFF
50%
V
t
ENZHS,
CC
To the output under test
V
E
CC
1.5 V
V
50%
OL
M odule Delay s
t
ENHSZ,
PAD
GND
S, A or B
10%
(Used to measure rising/falling edges)
To AC test loads (shown below)
Out
GND
Out
50%
t
PD
V
t
V
CC
50%
PD
CC
En
Out
GND
Load 2
V
50%
50%
CC
50%
GND
S
A
B
t
R to V
R to GND for t
R = 1 k
t
GND
ENZHS,
35 pF
PD
t
V
PD
GND
CC
1.5 V
V
CC
Y
50%
50%
OH
for t
50%
V
t
PLZ
ENHSZ,
PHZ
CC
/t
GND
PZL
/t
90%
PZH