Rainbow-electronics DS1500 Manual de usuario Pagina 6

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DS1500 Y2KC Watchdog RTC with Nonvolatile Control
6 of 19
Figure 4. Burst Mode Timing Waveform
A0–A4
DQ0–DQ7
O
E, WE, OR CS
13h
PW
HIGH
PW
LOW
POWER-UP/DOWN CHARACTERISTICS (Figure 5)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CS, CEI, or WE at V
IH
Before Power-Fail
t
PF
0
ms
V
CCI
Fall Time: V
PF(MAX)
to V
PF(MIN)
t
F
300
ms
V
CCI
Fall Time: V
PF(MIN)
to V
SO
t
FB
10
ms
V
CCI
Rise Time: V
PF(MIN)
to V
PF(MAX)
t
R
0
ms
V
PF
to RST High
t
REC
35 200 ms
CAPACITANCE
(T
A
= +25°C)
PARAMETER SYMBOL 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
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