PCF2127TSLASH2Y datasheet(78/100 Pages) PHILIPS

78 / 100 page

PCF2127

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Product data sheet

Rev. 8 — 19 December 2014

78 of 100

NXP Semiconductors

PCF2127

Accurate RTC with integrated quartz crystal for industrial applications

13.2 Frequency characteristics

[1]

1 ppm corresponds to a time deviation of 0.0864 seconds per day.

[2]

Only valid if CLKOUT frequencies are not equal to 32.768 kHz or if CLKOUT is disabled.

[3]

Not production tested. Effects of reflow soldering are included (see Ref. 3 “AN11266”).

Table 91.

Frequency characteristics

VDD = 1.8 V to 4.2 V; VSS =0V; Tamb =+25 C, unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

output frequency

on pin CLKOUT;

VDD or VBAT = 3.3 V;

COF[2:0] = 000;

AO[3:0] = 1000

32.768

kHz

f/f

frequency stability

VDD or VBAT = 3.3 V

PCF2127AT

Tamb = 15 C to +60 C-

3

5ppm

Tamb = 25 Cto 15 C

and

Tamb =+60 Cto+65 C

5

10

ppm

PCF2127T

Tamb = 30 C to +80 C

[1][2] -

3

8ppm

Tamb = 40 Cto 30 C

and

Tamb =+80 Cto+85 C

[1][2] -

5

15

ppm

f

xtal/fxtal

relative crystal

frequency variation

crystal aging

[3]

PCF2127AT

first year;

VDD or VBAT = 3.3 V

3ppm

PCF2127T

first year

3ppm

ten years

8ppm

f/V

frequency variation

with voltage

on pin CLKOUT

1-

ppm/V

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