EM6605 datasheet(39/43 Pages) NSC

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EM6605

17.7.RC Oscillator

T= +25°C (unless otherwise specified)

Parameter

Conditions

Symb.

Min.

Typ.

Max.

Unit

Fabrication process stability

(note1)

Df / f *

-20

±10 *

+20

Voltage stability

(note2)

2.4 - 5.0 V

Df /f * DU

-2%

± 0.3

+2%

1/V

Temperature Stability (note2)

-40°C- +85°C

Df /f * DT

0.02%

+0.06%

0.1%

1/°C

External resistor for frequency

(note4) (note5)

Vdd>1.8V

Rext

80*

120-330

600*

Ω

Ext. capacitor (parallel to Rext)

(note4)

Cext

150

390

Oscillator start time (note3)

Vdd>1.8V

tdosc

0.1

System start time

(note3)

(oscillator+cold start reset)

Vdd>1.8V

tdsys

Oscillation detector frequency

Vdd>1.8V &

Vdd<5.0V

fOD

4.0

kHz

Note1: Typical value of ±10% for “Fabrication process stability” gives a range where about 93-98% of all

pieces are situated relative to their mean frequency f *.

Note2: Oscillator stability in voltage and temperature is for frequency range from 30kHz - 300 kHz

Note3: Oscillator start time is for the worst case - 32 kHz frequency (low frequency)

Note4: External capacitor parallel to Rext which set the system frequency – The capacitor must be as close as

possible to RCin pin. The connection tw. Resistor and Capacitor on this pin must be really as short as

possible otherwise the RC oscillator has bigger jitter. (capacitor is not obligatory but can improve voltage

dependance and reduce jitter.

Note5: External resistor Rext which can set the frequency can have bigger range but this should be discussed

by EM for special cases only. Tests were made only during qualification of the product.

17.8.Input Timing characteristics

1.8V<Vdd<5.0V, -20°C <T<85°C (unless otherwise specified) at f=32kHz

Parameter

Conditions

Symb.

Min.

Unit

RESET pulse length to exit

SLEEP mode

RESET from

SLEEP

tRESsl

µs

RESET pulse length (debounced)

PortA , C pulse length (debounced)

DebCK = 0

tdeb0

RESET pulse length (debounced)

PortA , C pulse length (debounced)

DebCK = 1

tdeb1

EM6605 Datasheet(PDF) 39 Page - National Semiconductor (TI)

EM6605 Datasheet(HTML) 39 Page - National Semiconductor (TI)

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