Datasheet
PCF8563 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 10 — 3 April 2012 34 of 50
NXP Semiconductors
PCF8563
Real-time clock/calendar
13. Dynamic characteristics
[1] C
L
is a calculation of C
trim
and C
OSCO
in series: .
[2] Unspecified for f
CLKOUT
= 32.768 kHz.
[3] All timing values are valid within the operating supply voltage at ambient temperature and referenced to V
IL
and V
IH
with an input voltage
swing of V
SS
to V
DD
.
[4] A detailed description of the I
2
C-bus specification is given in Ref. 11 “UM10204”.
[5] I
2
C-bus access time between two STARTs or between a START and a STOP condition to this device must be less than one second.
Table 30. Dynamic characteristics
V
DD
= 1.8 V to 5.5 V; V
SS
=0V; T
amb
=
40
C to +85
C; f
osc
= 32.768 kHz; quartz R
s
=40k
; C
L
= 8 pF; unless otherwise
specified.
Symbol Parameter Conditions Min Typ Max Unit
Oscillator
C
OSCO
capacitance on pin OSCO 15 25 35 pF
f
osc
/f
osc
relative oscillator frequency variation V
DD
=200mV;
T
amb
=25C
-0.2-ppm
Quartz crystal parameters (f = 32.768 kHz)
R
s
series resistance - - 100 k
C
L
load capacitance parallel
[1]
7 - 12.5 pF
C
trim
trimmer capacitance external;
on pin OSCI
5- 25pF
CLKOUT output
CLKOUT
duty cycle on pin CLKOUT
[2]
-50-%
I
2
C-bus timing characteristics (see Figure 28)
[3][4]
f
SCL
SCL clock frequency
[5]
- - 400 kHz
t
HD;STA
hold time (repeated) START condition 0.6 - - s
t
SU;STA
set-up time for a repeated START condition 0.6 - - s
t
LOW
LOW period of the SCL clock 1.3 - - s
t
HIGH
HIGH period of the SCL clock 0.6 - - s
t
r
rise time of both SDA and SCL signals
standard-mode - - 1 s
fast-mode - - 0.3 s
t
f
fall time of both SDA and SCL signals - - 0.3 s
t
BUF
bus free time between a STOP and START
condition
1.3 - - s
C
b
capacitive load for each bus line - - 400 pF
t
SU;DAT
data set-up time 100 - - ns
t
HD;DAT
data hold time 0 - - ns
t
SU;STO
set-up time for STOP condition 0.6 - - s
t
w(spike)
spike pulse width on bus - - 50 ns
C
L
C
trim
C
OSCO
C
trim
C
OSCO
+
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=