Rainbow Electronics DS1677 - Manual (Page 16)

DS1677
16 of 17
POWER–FAIL WARNING Figure 14
NOTES:
1. All voltages are referenced to ground.
2. I
CCA
is specified with outputs open, CS set to a logic 1, SCLK=500 kHz, oscillator enabled, and A/D
converter enabled.
3. I
ADC
is specified with CS, V
CCO
open and I/O, SCLK at logic zero. A/D converter is enabled.
4. I
CCS
is specified with CS, V
CCO
open and I/O, SCLK at logic zero. A/D converter is disabled.
5. CS has a 40 k Ω pull–down resistor to ground.
6. Measured at V
IH
=2.0V or V
IL
=0.8V and 10 ns maximum rise and fall time.
7. Measured at V
OH
=2.4V or V
OL
=0.4V.
8. Load capacitance= 25 pF.
9. I
CCO
=100 mA, V
CC
> V
CCTP
.
10. V
CCO
switchover from V
CC
to V
BAT
occurs when V
CC
drops below the lower of V
CCSW
and V
BAT
.
11. Current from V
CC
input pin to V
CCO
output pin.
12. Current from V
BAT
input pin to V
CCO
output pin.
13. Timebase is generated by very accurate crystal oscillator. Accuracy of this time period is based on
the crystal that is used. A typical crystal with a specified load capacitance of 6 pF will provide an
ccuracy within
±100 ppm over the 0°C to 70°C temperature range. For greater accuracy see
DS32KHz data sheet.
14. If the EOSC bit in the Control Register is set to a logic 1, t
RPU
is equal to 250 ms plus the start–up
time of the crystal oscillator.