Datasheet

10
9
8
7
6
5
4
3
2
ADSP-BF561
DDEXT
18
16
RISE TIME
FALL TIME
RISE TIME
FALL TIME
RISE AND FALL TIME ns (10% to 90%)
RISE AND FALL TIME ns (10% to 90%)
14
12
10
8
6
4
2
1
0
0
0 50 100 150 200 250
0 50 100 150 200 250
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
Figure 43. Typical Rise and Fall Times (10% to 90%) versus Load Capacitance
Figure 46. Typical Rise and Fall Times (10% to 90%) versus Load Capacitance
for Driver B at V
DDEXT
(max)
for Driver D at V
DDEXT
(min)
30
14
RISE TIME
FALL TIME
RISE TIME
FALL TIME
RISE AND FALL TIME ns (10% to 90%)
12
10
8
6
4
RISE AND FALL TIME ns (10% to 90%)
25
20
15
10
5
2
0
0 50 100 150 200 250
0 50 100 150 200 250
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
0
Figure 44. Typical Rise and Fall Times (10% to 90%) versus Load Capacitance
Figure 47. Typical Rise and Fall Times (10% to 90%) versus Load Capacitance
for Driver C at V
DDEXT
(min)
for Driver D at V
DDEXT
(max)
20
ENVIRONMENTAL CONDITIONS
RISE TIME
FALL TIME
RISE AND FALL TIME ns (10% to 90%)
18
To determine the junction temperature on the application
printed circuit board use:
16
T
J
= T
CASE
+ (Ψ
JT
× P
D
)
14
12
where:
T
J
= junction temperature (C).
10
8
6
4
2
0
0 50 100 150
LOAD CAPACITANCE (pF)
T
CASE
= case temperature (C) measured by customer at top
center of package.
Ψ
JT
= from Table 32 on Page 45 through Table 34 on Page 45.
P
D
= power dissipation (see Power Dissipation on Page 42 for
the method to calculate P
D
).
200 250
Values of θ
JA
are provided for package comparison and printed
circuit board design considerations. θ
JA
can be used for a first
Figure 45. Typical Rise and Fall Times (10% to 90%) versus Load Capacitance
order approximation of T
J
by the equation:
for Driver C at V
DDEXT
(max)
T
J
= T
A
+ (θ
JA
× P
D
)
where:
T
A
= ambient temperature (C).
Rev. E | Page 44 of 64 | September 2009