Rainbow Electronics DS1500 - Manual (Page 7)

DS1500 Y2KC Watchdog RTC with Nonvolatile Control
7 of 19
Figure 5. 5V Power-Up/Down Waveform Timing
OUTPUTS
V
CCI
V
PF(MAX)
V
PF(MIN)
INPUTS
HIGH-Z
RST
DON'T CARE
VALID
RECOGNIZED RECOGNIZED
VALID
t
F
t
FB t
PF
t
DR
V
SO
t
R
t
REC
Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery-
backup mode.