Datasheet

DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
6 of 22
Figure 4. Burst Mode Timing Waveform
A0
–A4
DQ0–DQ7
OE
,
WE
, OR
CE
13h
PW
HIGH
PW
LOW
POWER-UP/DOWN CHARACTERISTICS
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CE or WE at V
IH
Before Power-Fail
t
PF
0
µs
V
CC
Fall Time: V
PF(MAX)
to V
PF(MIN)
t
F
300
µs
V
CC
Fall Time: V
PF(MIN)
to V
SO
t
FB
10
µs
V
CC
Rise Time: V
PF(MIN)
to V
PF(MAX)
t
R
0
µs
V
PF
to RST High t
REC
35 200 ms
(T
A
= +25°C)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Expected Data-Retention Time
(Oscillator On)
t
DR
(Note 9) 10 Years
CAPACITANCE
(T
A
= +25°C)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Capacitance on All Input Pins C
IN
10 pF
Capacitance on IRQ, PWR, RST, and
DQ Pins
C
IO
10 pF
AC TEST CONDITIONS
OUTPUT LOAD
INPUT PULSE
LEVELS
TIMING MEASUREMENT
REFERENCE LEVELS
INPUT PULSE RISE
AND FALL TIMES
(Y) 50pF + 1TTL Gate
0V to 3.0V for 5V
operation
Input: 1.5V
5ns
(W) 25pF + 1 TTL Gate
Output: 1.5V
OE, WE, or CE