STK17T88

RTC DC Characteristics

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

1.8

3.3

1.8

3.3

V

Typical = 3.0 Volts during normal operation

 

Voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VRTCcap

RTC Capacitor Pin

1.2

2.7

1.2

2.7

V

Typical = 2.4 Volts during normal operation

 

Voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tOSCS

RTC Oscillator time to

10

10

sec

At Minimum Temperature from Power up or

 

start

 

 

 

 

 

Enable

 

 

 

 

 

 

 

 

 

 

5

5

sec

At 25°C from Power up or Enable

 

 

 

 

 

 

 

 

Figure 4. RTC Component Configuration

1

 

C

Y

RF

 

1

2

 

C

 

X1

X2

Recommended Values

Y1 = 32.768 KHz

RF = 10M Ohm

C1 = 0 (install cap footprint, but leave unloaded)

C2 = 56 pF ± 10% (do not vary from this value)

Document Number: 001-52040 Rev. *A

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Cypress STK17T88 manual RTC DC Characteristics, Ibak