adsp-21msp58 Analog Devices, Inc., adsp-21msp58 Datasheet - Page 25

• Manufacturer Part Number: adsp-21msp58
• Description: Dsp Microcomputers
• Manufacturer: Analog Devices, Inc.

REV. 0
Parameter
Clock Signals
t
an input clock with a quency equal to half the instruction
rate; a 13 MHz input clock (which is equivalent to 76.92 ns)
yields a 38.46 ns processor cycle (equivalent to 26 MHz).
t
substituted for all relevant timing parameters to obtain
specification value. Example: t
= 0.5 (38.46 ns) – 7 ns = 12.23 ns.
Timing Requirement:
t
t
t
Switching Characteristic:
t
t
t
Control Signals
Timing Requirement:
t
NOTES
1
Applies after power-up sequence is complete. Internal phase lock loop requires no more than 2000 CLKIN cycles assuming stable CLKIN (not including
CK
CK
CKI
CKIL
CKIH
CKL
CKH
CKOH
RSP
crystal oscillator start-up time).
values within the range of 0.5 t
is defined as 0.5 t
CKI.
CLKOUT
CLKIN Period
CLKIN Width Low
CLKIN Width High
CLKOUT Width Low
CLKOUT Width High
CLKIN High to CLKOUT High
RESET Width Low
The ADSP-21msp58/59 uses
CLKIN
CKH
CKI
= 0.5t
period should be
CK
– 7 ns
Figure 15. Clock Signals
t
CKIL
t
CKI
t
CKOH
t
CKL
–25–
Min
76.92
20
20
0.5t
0.5t
0
5t
t
CK
CKH
CK
CK
1
t
– 7
– 7
CKIH
Max
125
20
ADSP-21msp58/59
Unit
ns
ns
ns
ns
ns
ns
ns