Analog Devices ADSP-21020 Hold after Clkin High, Pulse Width TCK +, TDTEX Clkin High to Timexp

ADSP-21020

Interrupts

				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:
tSIR IRQ3-0			Setup before CLKIN High	38	31	25	23	38 + 3DT/4		ns
tHIR	IRQ	3-0	Hold after CLKIN High	0	0	0	0		ns
tIPW	IRQ	3-0	Pulse Width	55	45	38	35	tCK + 5		ns

NOTE

*DT = tCK – 50 ns

Meeting setup and hold guarantees interrupts will be latched in that cycle. Meeting the pulse width is not necessary if the setup and hold is met. Likewise, meeting the setup and hold is not necessary if the pulse width is met. See the Hardware Configuration chapter of the ADSP-21020 User’s Manual for interrupt servicing informa- tion.

CLKIN

				t	SIR	tHIR
		IRQ3-0
					tIPW
			Figure 5. Interrupts
Timer
		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
Switching Characteristic:
tDTEX CLKIN High to TIMEXP		24	24		24	24			ns
NOTE
*DT = tCK – 50 ns
	CLKIN
		t DTEX				tDTEX

TIMEXP

Figure 6. TIMEXP

–14– REV. C