Philips Semiconductors
Product specification
Low power clock/calendar
PCF8593
13 AC CHARACTERISTICS
VDD = 2.5 to 6.0 V; VSS = 0 V; Tamb = −40 to +85 °C; unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Oscillator
Cosc
integrated oscillator
capacitance
20
−
25
30
−
pF
∆fosc
oscillator stability
for ∆VDD = 100 mV;
2 × 10−7
Tamb = 25 °C; VDD = 1.5 V
fi
input frequency
note 1
−
−
1
MHz
Quartz crystal parameters (f = 32.768 kHz)
Rs
CL
CT
series resistance
−
−
5
−
40
−
kΩ
pF
pF
parallel load capacitance
trimmer capacitance
10
−
25
I2C-bus timing (see Fig.22; notes 2 and 3)
fSCL
SCL clock frequency
tolerable spike width on bus
bus free time
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
100
100
−
kHz
ns
µs
µs
µs
µs
µs
µs
µs
ns
ns
µs
µs
tSP
tBUF
4.7
4.7
4.0
4.7
4.0
−
tSU;STA
tHD;STA
tLOW
tHIGH
tr
START condition set-up time
START condition hold time
SCL LOW time
−
−
−
SCL HIGH time
−
SCL and SDA rise time
SCL and SDA fall time
data set-up time
1.0
0.3
−
tf
−
tSU;DAT
tHD;DAT
tVD;DAT
tSU;STO
250
0
data hold time
−
SCL LOW to data out valid
STOP condition set-up time
−
3.4
−
4.0
Notes
1. Event counter mode only.
2. All timing values are valid within the operating supply voltage and ambient temperature range and reference to VIL
and VIH with an input voltage swing of VSS to VDD
.
3. A detailed description of the I2C-bus specification, with applications, is given in brochure “The I2C-bus and how to
use it”. This brochure may be ordered using the code 9398 393 40011.
1997 Mar 25
21
NXP [ NXP ]
