ADMCF326 datasheet(4/36 Pages) AD

No de pièce	ADMCF326

Description	28-Lead Flash Memory DSP Motor Controller

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ADMCF326

–4–

REV. 0

TIMING PARAMETERS

Parameter

Min

Max

Unit

Clock Signals

Signal tCK is deﬁned as 0.5 tCKIN. The ADMCF326 uses an input clock with a

frequency equal to half the instruction rate; a 10 MHz input clock (which is

equivalent to 100 ns) yields a 50 ns processor cycle (equivalent to 20 MHz). When

tCK values are within the range of 0.5 tCKIN period, they should be substituted for

all relevant timing parameters to obtain speciﬁcation value.

Example: tCKH = 0.5 tCK – 10 ns = 0.5 (50 ns) – 10 ns = 15 ns.

Timing Requirements:

tCKIN

CLKIN Period

100

150

ns

tCKIL

CLKIN Width Low

20

ns

tCKIH

CLKIN Width High

20

ns

Switching Characteristics:

tCKL

CLKOUT Width Low

0.5 tCK – 10

ns

tCKH

CLKOUT Width High

0.5 tCK – 10

ns

tCKOH

CLKIN High to CLKOUT High

0

20

ns

Control Signals

Timing Requirement:

tRSP

RESET Width Low

5 tCK

1

ns

PWM Shutdown Signals

Timing Requirement:

tPWMTPW

PWMTRIP Width Low

tCK

ns

NOTES

1Applies after power-up sequence is complete.

CLKIN

CLKOUT

tCKL

tCKIL

tCKH

tCKIH

tCKIN

tCKOH

Figure 1. Clock Signals

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