DS1501 Maxim, DS1501 Datasheet - Page 6

• Manufacturer Part Number: DS1501
• Description: The DS1501/DS1511 are full-function, year 2000-compliant real-time clock/calendars (RTCs) with an RTC alarm, watchdog timer, power-on reset, battery monitors, 256 bytes NV SRAM, and a 32
• Manufacturer: Maxim

Figure 4. Burst Mode Timing Waveform
POWER-UP/DOWN CHARACTERISTICS
(T
CAPACITANCE
(T
AC TEST CONDITIONS
O E , W E , O R C E
CE or WE at V
V
V
V
V
Expected Data-Retention Time
(Oscillator On)
Capacitance on All Input Pins
Capacitance on IRQ, PWR, RST, and DQ
Pins
A
A
CC
CC
CC
PF
= +25°C)
= +25°C)
(W) 25pF + 1 TTL Gate
(Y) 50pF + 1TTL Gate
D Q 0 – D Q 7
to RST High
Fall Time: V
Fall Time: V
Rise Time: V
OUTPUT LOAD
A 0 – A 4
PARAMETER
PARAMETER
PARAMETER
IH
PF(MAX)
PF(MIN)
Before Power-Fail
PF(MIN)
to V
to V
to V
SO
PF(MIN)
PF(MAX)
0V to 3.0V for 5V
INPUT PULSE
1 3 h
P W
operation
LEVELS
L O W
SYMBOL
SYMBOL
SYMBOL
P W
t
C
C
t
t
REC
t
t
t
PF
FB
DR
R
F
IN
IO
H IG H
6 of 22
TIMING MEASUREMENT
(Note 9)
REFERENCE LEVELS
CONDITIONS
CONDITIONS
CONDITIONS
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
Output: 1.5V
Input: 1.5V
MIN
MIN
MIN
300
10
35
10
0
0
TYP
TYP
TYP
INPUT PULSE RISE
AND FALL TIMES
MAX
MAX
MAX
200
10
10
5ns
UNITS
UNITS
UNITS
Years
ms
pF
pF
μs
μs
μs
μs