DS1501_09 Datasheet, PDF (6/22 Pages) Maxim Integrated Products – Y2K-Compliant Watchdog Real-Time Clocks

Figure 4. Burst Mode Timing Waveform
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
A0–A4
13h
PW LOW
PW HIGH
OE, WE, OR CE
DQ0–DQ7
POWER-UP/DOWN CHARACTERISTICS
PARAMETER
CE or WE at V_IH Before Power-Fail
SYMBOL
t_PF
V_CC Fall Time: V_PF(MAX) to V_PF(MIN)
t_F
V_CC Fall Time: V_PF(MIN) to V_SO
t_FB
V_CC Rise Time: V_PF(MIN) to V_PF(MAX)
t_R
V_PF to RST High
t_REC
CONDITIONS
MIN TYP MAX UNITS
0
μs
300
μs
10
μs
0
μs
35
200
ms
(T_A = +25°C)
PARAMETER
Expected Data-Retention Time
(Oscillator On)
SYMBOL
t_DR
CONDITIONS
(Note 9)
CAPACITANCE
(T_A = +25°C)
PARAMETER
Capacitance on All Input Pins
Capacitance on IRQ, PWR, RST, and DQ
Pins
SYMBOL
C_IN
C_IO
CONDITIONS
MIN TYP MAX UNITS
10
Years
MIN TYP MAX UNITS
10
pF
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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