DS12887 Maxim, DS12887 Datasheet - Page 3

• Manufacturer Part Number: DS12887
• Description: The DS12885, DS12887, and DS12C887 real-time clocks (RTCs) are designed to be direct replacements for the DS1285 and DS1287
• Manufacturer: Maxim

AC ELECTRICAL CHARACTERISTICS
(V
DC ELECTRICAL CHARACTERISTICS
(V
Cycle Time
Pulse Width, DS Low or R/W High
Pulse Width, DS High or R/W Low
Input Rise and Fall
R/W Hold Time
R/W Setup Time Before DS/E
Chip-Select Setup Time Before
DS or R/W
Chip-Select Hold Time
Read-Data Hold Time
Write-Data Hold Time
Address Valid Time to AS Fall
Address Hold Time to AS Fall
Delay Time DS/E to AS Rise
Pulse Width AS High
Delay Time, AS to DS/E Rise
Output Data Delay Time from DS
or R/W
Data Setup Time
Reset Pulse Width
IRQ Release from DS
IRQ Release from RESET
V
T
V
CC
A
CC
BAT
BAT
= +25°C, V
= 4.5V to 5.5V, T
= 0V, V
Current (OSC On);
Current (Oscillator Off)
PARAMETER
PARAMETER
BAT
BACKUP
= 3.0V, T
A
= 3.0V
= over the operating range.) (Note 2)
A
= over the operating range, unless otherwise noted.) (Note 2)
SYMBOL
SYMBOL
PW
I
PW
PW
t
BATDR
t
t
t
t
t
t
t
t
t
t
t
t
ASED
t
RWH
DHW
DSW
IRDS
t
I
R
RWS
t
DHR
DDR
RWL
CYC
t
AHL
ASD
ASL
IRR
BAT
CH
CS
, t
ASH
EH
EL
F
_____________________________________________________________________
(Note 8)
(Note 8)
CONDITIONS
CONDITIONS
Real-Time Clocks
MIN
MIN
385
150
125
100
10
50
20
10
30
10
20
60
40
20
0
0
5
TYP
TYP
MAX
MAX
120
500
100
DC
30
80
2
2
UNITS
UNITS
nA
nA
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
µs
µs
3