ADSP-21065 Analog Devices, ADSP-21065 Datasheet - Page 37

• Manufacturer Part Number: ADSP-21065
• Description: DSP Microcomputer
• Manufacturer: Analog Devices

Capacitive Loading
Output delays and holds are based on standard capacitive loads:
50 pF on all pins. The delay and hold specifications given
should be derated by a factor of l.8 ns/50 pF for loads other
than the nominal value of 50 pF. Figure 28 and Figure 29 show
how output rise time varies with capacitance. Figure 30 shows
graphically how output delays and hold vary with load capaci-
tance. (Note that this graph or derating does not apply to output
disable delays; see the previous section Output Disable time
under Test Conditions.) The graphs of Figure 28, Figure 29
and Figure 30 may not be linear outside the ranges shown.
18
16
14
12
10
8
6
4
2
0
0
20
40
60
LOAD CAPACITANCE – pF
RISE TIME
80
100
120
FALL TIME
140
160
180
200
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
–1
–2
6
5
4
3
2
1
0
0
0
0
20
20
40
40
60
60
LOAD CAPACITANCE – pF
LOAD CAPACITANCE – pF
RISE TIME
80
80
100
100
120
120
ADSP-21065L
FALL TIME
140
140
160
160
180
180
200
200