Datasheet

DS12885/DS12887/DS12887A/DS12C887/DS12C887A
Real-Time Clocks
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DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BAT
= 3.0V, T
A
= over the operating range, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
BAT
Current (OSC On);
T
A
= +25°C, V
BACKUP
= 3.0V
I
BAT
(Note 8) 500 nA
V
BAT
Current (Oscillator Off) I
BATDR
(Note 8) 100 nA
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 4.5V to 5.5V, T
A
= over the operating range.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Cycle Time t
CYC
385 DC ns
Pulse Width, DS Low or R/W High PW
EL
150 ns
Pulse Width, DS High or R/W Low PW
EH
125 ns
Input Rise and Fall t
R
, t
F
30 ns
R/W Hold Time t
RWH
10 ns
R/W Setup Time Before DS/E t
RWS
50 ns
Chip-Select Setup Time Before
DS or R/W
t
CS
20 ns
Chip-Select Hold Time t
CH
0ns
Read-Data Hold Time t
DHR
10 80 ns
Write-Data Hold Time t
DHW
0ns
Address Valid Time to AS Fall t
ASL
30 ns
Address Hold Time to AS Fall t
AHL
10 ns
Delay Time DS/E to AS Rise t
ASD
20 ns
Pulse Width AS High PW
ASH
60 ns
Delay Time, AS to DS/E Rise t
ASED
40 ns
Output Data Delay Time from DS
or R/W
t
DDR
20 120 ns
Data Setup Time t
DSW
100 ns
Reset Pulse Width t
RWL
5µs
IRQ Release from DS t
IRDS
2µs
IRQ Release from RESET t
IRR
2µs