PCF8563
NXP Semiconductors
Real-time clock/calendar
13. Dynamic characteristics
Table 30. Dynamic characteristics
VDD = 1.8 V to 5.5 V; VSS = 0 V; Tamb = 40 C to +85 C; fosc = 32.768 kHz; quartz Rs = 40 k; CL = 8 pF; unless otherwise
specified.
Symbol
Oscillator
COSCO
Parameter
Conditions
Min
Typ
Max
Unit
capacitance on pin OSCO
15
-
25
35
-
pF
fosc/fosc
relative oscillator frequency variation
VDD = 200 mV;
Tamb = 25 C
0.2
ppm
Quartz crystal parameters (f = 32.768 kHz)
Rs
series resistance
load capacitance
trimmer capacitance
-
-
-
-
100
12.5
25
k
pF
pF
[1]
CL
parallel
7
5
Ctrim
external;
on pin OSCI
CLKOUT output
[2]
[5]
CLKOUT
duty cycle on pin CLKOUT
-
50
-
%
I2C-bus timing characteristics (see Figure 28)[3][4]
fSCL
SCL clock frequency
-
-
-
-
-
-
400
kHz
s
tHD;STA
tSU;STA
tLOW
tHIGH
tr
hold time (repeated) START condition
set-up time for a repeated START condition
LOW period of the SCL clock
0.6
0.6
1.3
0.6
-
-
-
-
s
s
HIGH period of the SCL clock
s
rise time of both SDA and SCL signals
standard-mode
fast-mode
-
-
-
-
-
1
s
s
s
s
-
0.3
0.3
-
tf
fall time of both SDA and SCL signals
-
tBUF
bus free time between a STOP and START
condition
1.3
Cb
capacitive load for each bus line
data set-up time
-
-
-
-
-
-
400
pF
ns
ns
s
ns
tSU;DAT
tHD;DAT
tSU;STO
tw(spike)
100
0
-
data hold time
-
set-up time for STOP condition
spike pulse width
0.6
-
-
on bus
50
Ctrim COSCO
[1] CL is a calculation of Ctrim and COSCO in series: CL
=
.
-----------------------------------------
Ctrim + COSCO
[2] Unspecified for fCLKOUT = 32.768 kHz.
[3] All timing values are valid within the operating supply voltage at ambient temperature and referenced to VIL and VIH with an input voltage
swing of VSS to VDD
.
[4] A detailed description of the I2C-bus specification is given in Ref. 11 “UM10204”.
[5] I2C-bus access time between two STARTs or between a START and a STOP condition to this device must be less than one second.
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 [ NXP ]
