Cypress STK17T88 Computer Hardware User Manual


 
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
[+] Feedback