PC87413 datasheet(241/257 Pages) NSC

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11.0 Device Characteristics (Continued)

Revision 1.2

241

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11.5.3

Clock Timing

High Frequency Clock Timing

Figure 60. External High Frequency Clock Timing

Symbol

Clock Input Parameter

CLKIN (48 MHz)

Min

Typ

Max

Unit

tCH

Clock High Pulse Width2

8.2

tCL

Clock Low Pulse Width2

8.2

tCP

Clock Period2 (50%-50%)

20.83

21.5

tCR

Clock Rise Time2 (20%-80%)

2.5

tCF

Clock Fall Time2 (80%-20%)

2.5

Symbol

Clock Output Parameter

HFCKOUT (48 MHz)

HFCKOUT (40 MHz)

Min

Typ

Max

Min

Typ

Max

Unit

tCH

Clock High Pulse Width1,4

1. CL = 15 pF.

8.2

10.3

tCL

Clock Low Pulse Width1,4

8.2

10.3

tCP

Clock Period2

(50%-50%)

2. Not tested. Guaranteed by design.

t48TYP −

32KTOL

−

50ppm

3. t32KCLKIN tolerance.

20.83

t48TYP +

32KTOL

3 +

50ppm

t40TYP −

32KTOL

−

150ppm

t40TYP +

32KTOL

3 +

150ppm

tCR

Clock Rise Time4

(20%-80%)

4. Not tested. Guaranteed by characterization.

CL = 15 pF

2.5

CL =40pF

tCF

Clock Fall Time4

(80%-20%)

CL = 15 pF

2.5

CL =40pF

VIL

VIH

CLKIN

tCL

tCP

tCH

HFCKOUT

PC87413 Datasheet(PDF) 241 Page - National Semiconductor (TI)

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