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STK17TA8
Document #: 001-52039 Rev. **
Page 5 of 23
RTC DC Characteristics
Figure 4. RTC Recommended Component Configuration
Symbol
Parameter
Commercial
Industrial
Units
Notes
Min
Max
Min
Max
I
BAK
RTC Backup Current
—
300
—
350
nA
From either VRTCcap or VRTCbat
VRTCbat
RTC Battery Pin Voltage
1.8
3.3
1.8
3.3
V
Typical = 3.0 Volts during normal
operation
VRTCcap
RTC Capacitor Pin Voltage
1.2
2.7
1.2
2.7
V
Typical = 2.4 Volts during normal
operation
tOSCS
RTC Oscillator time to start
—
10
—
10
sec
At MIN Temperature from Power up
or Enable
—5—
5
sec
At 25
°C from Power up or Enable
X1
X2
Recommended Values
Y1 = 32.768 KHz
= 10M Ohm
= 0 (install cap footprint,
but leave unloaded)
= 56 pF ± 10% (do not vary from this value)
RF
C1
C2
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