LC823450 datasheet(90/112 Pages) ONSEMI

90 / 112 page

LC823450

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For Input from External Clock Source (XT1)

Do as follows when use the external clock signal that is

generated outside of LSI by the oscillation module, etc. The

specification about XTRTC is not available.

Figure 38. For Input from External Clock Source (XT1)

XIN

XOUT

Input H

Left open

• Input the signal of full amplitude to XIN (external

clock input)

Table 55. (FOR YOUR REFERENCE)

Item

Symbol

Min

Max

Unit

H Level Input Voltage

(Note 63)

VIH

VDDXT1 × 0.7

VDDXT1 + 0.3

L Level Input Voltage

(Note 63)

VIL

−0.3

VDDXT1 × 0.3

Hysteresis (Note 63)

VHYS

VDDXT1 × 0.1

VDDXT1 × 0.4

63. No VIH/VIL available to input cell of xtal oscillator.

The schmitt input of xtal oscillator is compliant with

(JEDEC Standard JESD8−12A.01 [Normal Range]).

• There is a possibility of influencing the signal quality

when there is a long wire pattern on a circuit board of

XOUT (The terminal opens). Therefore, recommend to

cut the wire pattern on a circuit board or no wire pattern

on it.

• The xtal oscillator is supposed to be used with quartz

resonator or ceramic resonator, we have no plan to

evaluate this LSI in case of external input to xtal

oscillator.

XTAL not Used

Do as follows when not use the oscillation cell.

Figure 39. XTAL not Used

XIN

XOUT

Input H

Left open

64. Supply the voltage of recommended operating range of VDDXT1/VSSXT1 (XIN1/XOUT1) even though XT1 is not used.

65. Supply the voltage of recommended operating range of VDDRTC/VSSRTC (XIN32K/XOUT32K), or recommended operating

range of Vdd1 even though XTRTC is not used

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