DS1500_11 Datasheet, PDF (6/20 Pages) Maxim Integrated Products – Y2K Watchdog RTC with Nonvolatile Control

Figure 4. Burst Mode Timing Waveform
DS1500 Y2KC Watchdog RTC with Nonvolatile Control
A0–A4
13h
PWLOW
PWHIGH
OE, WE, OR CS
DQ0–DQ7
POWER-UP/DOWN CHARACTERISTICS (Figure 5)
PARAMETER
SYMBOL
CONDITIONS
CS, CEI, or WE at V_IH Before Power-Fail
t_PF
V_CCI Fall Time: V_PF(MAX) to V_PF(MIN)
t_F
V_CCI Fall Time: V_PF(MIN) to V_SO
t_FB
V_CCI Rise Time: V_PF(MIN) to V_PF(MAX)
t_R
V_PF to RST High
t_REC
MIN TYP MAX UNITS
0
µs
300
µs
10
µs
0
µs
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
(Y) 50pF + 1TTL Gate
(W) 25pF + 1 TTL Gate
INPUT PULSE
LEVELS
0V to 3.0V for
5V operation
TIMING MEASUREMENT
REFERENCE LEVELS
Input: 1.5V
Output: 1.5V
INPUT PULSE RISE
AND FALL TIMES
5ns
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