ADSP-21020

REV. C

–13–

TIMING PARAMETERS

General Notes

See Figure 15 on page 24 for voltage reference levels. Use the exact timing information given. Do not attempt to derive parameters

from the addition or subtraction of others. While addition or subtraction would yield meaningful results for an individual device, the

values given in this data sheet reflect statistical variations and worst cases. Consequently, you cannot meaningfully add parameters to

derive other specifications.

Clock Signal

K/B/T Grade

K/B/T Grade

B/T Grade

K Grade

20 MHz

25 MHz

30 MHz

33.3 MHz

Parameter

Min

Max

Min

Max

Min

Max

Min

Max

Unit

Timing Requirement:

CLKIN Period

50

150

40

150

33

150

30

150

ns

CLKIN Width High

10

10

10

10

ns

CLKIN Width Low

10

10

10

10

ns

CLKIN

t

CKH

t

CKL

t

CK

Figure 3. Clock

Reset

K/B/T Grade K/B/T Grade

B/T Grade

K Grade

20 MHz

25 MHz

30 MHz

33.3 MHz

Frequency Dependency*

Parameter

Min

Max

Min

Max

Min Max

Min Max

Min

Max

Unit

Timing Requirement:

200

160

132

120

ns

2

RESET Setup before CLKIN High 29

50

24

40

21

33

19

30

29 + DT/2

30

ns

NOTES

location 8 in the same cycle). See the Hardware Configuration chapter of the ADSP-21020 User’s Manual for reset sequence information.

CLKIN

RESET

Figure 4. Reset