56F807 datasheet(31/60 Pages) FREESCALE

31 / 60 page

External Clock Operation

56F807 Technical Data Technical Data, Rev. 15

Freescale Semiconductor

3.4.3

External Clock Source

The recommended method of connecting an external clock is given in Figure 3-9. The external clock

source is connected to XTAL and the EXTAL pin is grounded.

Figure 3-9 Connecting an External Clock Signal

Figure 3-10 External Clock Timing

Table 3-8 External Clock Operation Timing Requirements5

Operating Conditions: V

SS = VSSA = 0 V, VDD = VDDA = 3.0–3.6 V, TA = –40° to +85°C

Characteristic

Symbol

Min

Typ

Max

Unit

Frequency of operation (external clock driver)1

See Figure 3-9 for details on using the recommended connection of an external clock driver.

fosc

0—

MHz

Clock Pulse Width2, 3

The high or low pulse width must be no smaller than 6.25ns or the chip will not function.

Parameters listed are guaranteed by design.

tPW

6.25

—

56F807

XTAL

EXTAL

External

VSS

Clock

External

Clock

VIH

VIL

Note: The midpoint is VIL + (VIH – VIL)/2.

90%

50%

10%

90%

50%

10%

tPW

56F807 Datasheet(PDF) 31 Page - Freescale Semiconductor, Inc

56F807 Datasheet(HTML) 31 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

Datasheet Download

Link URL