Rainbow Electronics DS1511 - Manual (Page 6)

DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
6 of 20
Figure 4. Burst Mode Timing Waveform
A 0 –A 4
D Q 0 – D Q 7
O E , W E , O R C E
1 3 h
PW
H IG H
PW
L OW
POWER-UP/DOWN CHARACTERISTICS
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CE or WE at V
IH
Before Power-Fail t
PF
0 ms
V
CC
Fall Time: V
PF(MAX)
to V
PF(MIN)
t
F
300 ms
V
CC
Fall Time: V
PF(MIN)
to V
SO
t
FB
10 ms
V
CC
Rise Time: V
PF(MIN)
to V
PF(MAX)
t
R
0 ms
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 Input: 1.5V
(W) 25pF + 1 TTL Gate
0V to 3.0V for 5V
operation Output: 1.5V
5ns