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STK17T88
Document Number: 001-52040 Rev. *A Page 5 of 22
RTC DC Characteristics
Figure 4. RTC Component Configuration
Symbol Parameter
Commercial Industrial
Units Notes
Min Max Min Max
IBAK 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 Minimum Temperature from Power up or
Enable
—5—5secAt 25°C from Power up or Enable
C
1
C
2
RF
Y
1
X
1
X
2
Recommended Values
Y
1
= 32.768 KHz
= 10M Ohm
= 0 (install cap footprint,
but leave unloaded)
= 56 pF ± 10% (do not vary from this value)
RF
C
1
C
2
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