CF745 datasheet(159/217 Pages) MICROCHIP

159 / 217 page

Preliminary

DS30453B-page 159

PIC16C54A/CR57B/C58A/CR58A

PIC16C5X

18.0

DC AND AC CHARACTERISTICS - PIC16C54A/CR57B/C58A/CR58A

The graphs and tables provided in this section are for design guidance and are not tested. In some graphs or tables the

data presented are outside speciﬁed operating range (e.g., outside speciﬁed VDD range). This is for information only

and devices will operate properly only within the speciﬁed range.

The data presented in this section is a statistical summary of data collected on units from different lots over a period of

time. “Typical” represents the mean of the distribution while “max” or “min” represents (mean + 3

σ) and (mean – 3σ)

respectively, where

σ is standard deviation.

FIGURE 18-1: TYPICAL RC OSCILLATOR FREQUENCY vs. TEMPERATURE

TABLE 18-1:

RC OSCILLATOR FREQUENCIES

Cext

Rext

Average

Fosc @ 5 V, 25

°C

20 pF

3.3 k

4.973 MHz

± 27%

5 k

3.82 MHz

± 21%

10 k

2.22 MHz

± 21%

100 k

262.15 kHz

± 31%

100 pF

3.3 k

1.63 MHz

± 13%

5 k

1.19 MHz

± 13%

10 k

684.64 kHz

± 18%

100 k

71.56 kHz

± 25%

300 pF

3.3 k

660 kHz

± 10%

5.0 k

484.1 kHz

± 14%

10 k

267.63 kHz

± 15%

160 k

29.44 kHz

± 19%

The frequencies are measured on DIP packages.

The percentage variation indicated here is part-to-part variation due to normal process distribution. The variation

indicated is

±3 standard deviation from average value for VDD = 5 V.

FOSC

FOSC (25

°C)

1.10

1.08

1.06

1.04

1.02

1.00

0.98

0.96

0.94

0.92

0.90

010

°C)

Frequency normalized to +25

°C

VDD = 5.5 V

VDD = 3.5 V

Rext

≥ 10 kΩ

Cext = 100 pF

0.88

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