Datasheet

PCF2129 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 7 — 19 December 2014 64 of 86
NXP Semiconductors
PCF2129
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 “
AN11186”).
Table 80. Frequency characteristics
V
DD
= 1.8 V to 4.2 V; V
SS
=0V; T
amb
=+25  C, unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
f
o
output frequency on pin CLKOUT;
V
DD
or V
BAT
= 3.3 V;
COF[2:0] = 000;
AO[3:0] = 1000
- 32.768 - kHz
f/f frequency stability V
DD
or V
BAT
= 3.3 V
PCF2129AT
T
amb
= 15 C to +60 C
[1][2]
- 3 5ppm
T
amb
= 25 Cto15 C
and
T
amb
=+60Cto+65C
[1][2]
- 5 10 ppm
PCF2129T
T
amb
= 30 C to +80 C
[1][2]
- 3 8ppm
T
amb
= 40 Cto30 C
and
T
amb
=+80Cto+85C
[1][2]
- 5 15 ppm
f
xtal
/f
xtal
relative crystal
frequency variation
crystal aging
PCF2129AT
first year;
V
DD
or V
BAT
= 3.3 V
[3]
--3ppm
PCF2129T
first year
[3]
--3ppm
ten years - - 8ppm
f/V frequency variation
with voltage
on pin CLKOUT - 1- ppm/V