
DS1254
9 of 17
BATTERY WARNING TIMING
(VCC = 3.3V 10%, TA = 0
C to +70C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Battery Test Cycle
tBTC
24
hour
Battery Test Pulse Width
tBTPW
1
seconds
Battery Test to
BW Active
tBW
1
seconds
VCC Valid to BW Valid
tBPU
1
seconds
3
AC TEST CONDITIONS
Output Load:
100pF + 1 TTL Gate
Input Pulse Levels:
0V to 3.0V
Timing Measurement Reference Levels:
Input: 1.5V
Output: 1.5V
Input Pulse Rise and Fall Times: 5ns
Figure 4. Memory Read Cycle Timing (Note 9)
tRC
ADDRESS
tACC
CE
OE
DQ0–DQ7
tOH
tCO
tOE
tCOE
tOD
OUTPUT
DATA VALID