LC651154N datasheet(20/39 Pages) SANYO

20 / 39 page

RC Oscillator Characteristics for the LC651154N and LC651152N

Figure 9 shows the RC oscillator characteristics for the LC651154N and LC651152N.

However, the sample-to-sample variation in the LC651154N and LC651152N RC oscillator frequency described below

does occur.

1) When:

VDD = 3.0 to 6.0 V, Ta = –40 to +85°C

External constants: Cext = 270 pF

Rext = 12.0 k

Ω

fMOSC will be:

290 kHz

≤ f

MOSC ≤ 818 kHz

2) When:

VDD = 3.0 to 6.0 V, Ta = –40 to +85°C

External constants: Cext = 270 pF

Rext = 5.6 k

Ω

fMOSC will be:

587 kHz

≤ f

MOSC ≤ 1298 kHz

Therefore, only the above circuit constants are recommended.

If use of circuit constants other than the above is unavoidable, they must be in the following ranges.

Cext = 150 to 390 pF

Rext = 3 to 20 k

Ω

(See figure 9.)

Notes • The oscillator frequency must be in the range 350 to 850 kHz when VDD = 5.0 V and Ta = 25°C.

• Applications must be designed to have adequate margins so that the oscillator frequency falls in the operating

clock frequency range (see the oscillator divider option table) for the voltage range VDD = 3.0 to 6.0 V and for

the temperature range Ta = –40 to +85°C.

No. 6278-20/39

LC651154N, 651154F, 651154L, 651152N, 651152F, 651152L

These characteristics curves are for

reference purposes only and are not

guaranteed.

Figure 9 RC Oscillator Frequency Data (Representative Values)

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