Analog-devices ADSP-2181 Manual de usuario descargar pdf (Pagina 20)

ADSP-2181/ADSP-2183

REV. 0

–20–

ADSP-2181

Parameter Min Max Unit

Clock Signals and Reset

Timing Requirements:

CKI

CLKIN Period 60 150 ns

CKIL

CLKIN Width Low 20 ns

CKIH

CLKIN Width High 20 ns

Switching Characteristics:

CKL

CLKOUT Width Low 0.5t

– 7 ns

CKH

CLKOUT Width High 0.5t

– 7 ns

CKOH

CLKIN High to CLKOUT High 0 20 ns

Control Signals

Timing Requirements:

RSP

RESET Width Low 5t

ADSP-2183

28.8 MHz

Parameter Min Max Unit

Clock Signals and Reset

Timing Requirements:

CKI

CLKIN Period 69.4 150 ns

CKIL

CLKIN Width Low 20 ns

CKIH

CLKIN Width High 20 ns

Switching Characteristics:

CKL

CLKOUT Width Low 0.5t

– 7 ns

CKH

CLKOUT Width High 0.5t

– 7 ns

CKOH

CLKIN High to CLKOUT High 0 20 ns

Control Signals

Timing Requirements:

RSP

RESET Width Low 5t

NOTE

Applies after power-up sequence is complete. Internal phase lock loop requires no more than 2000 CLKIN cycles assuming stable CLKIN (not including crystal

oscillator start-up time).

CLKIN

CLKOUT

CKIL

CKOH

CKH

CKL

CKI

CKIH

Figure 22. Clock Signals

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 39 40

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Analog-devices ADSP-2181 Manual de usuario Pagina 20

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