RTCs with Constant-Voltage Trickle Charger
5C/DS12R87
DC ELECTRICAL CHARACTERISTICS (DS12R885 Only)
(V
CC
= 0V, V = 3.2V, T = -40°C to +85°C, unless otherwise noted.) (Note 1)
BACKUP A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
1000
100
UNITS
nA
V
Current (OSC On);
BACKUP
I
(Note 7)
(Note 7)
BACKUPDR
800
BACKUP2
T
A
= +25°C, V
= 3.0V
BACKUP
V
Current (Oscillator Off)
I
nA
BACKUP
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 4.5V to 5.5V, T = -40°C to +85°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
180
80
TYP
MAX
UNITS
ns
Cycle Time
t
DC
CYC
Pulse Width, DS Low or R/W
Pulse Width, DS High or R/W
PW
ns
EL
PW
65
ns
EH
Input Rise and Fall
R/W Hold Time
t , t
30
35
ns
R
F
RWH
RWS
t
t
0
ns
R/W Setup Time Before DS/E
10
ns
Chip-Select Setup Time Before
DS or R/W
t
5
ns
CS
Chip-Select Hold Time
t
0
5
ns
ns
ns
ns
ns
ns
ns
ns
CH
Read-Data Hold Time
t
DHR
Write-Data Hold Time
t
0
DHW
Address Valid Time to AS Fall
Address Hold Time to AS Fall
Delay Time DS/E to AS Rise
Pulse Width AS High
t
20
5
ASL
AHL
ASD
t
t
10
30
35
PW
ASH
Delay Time, AS to DS/E Rise
t
ASED
Output Data Delay Time from DS
or R/W
t
(Note 8)
15
60
ns
DDR
Data Setup Time
t
50
5
ns
μs
μs
μs
DSW
Reset Pulse Width
t
RWL
IRQ Release from DS
IRQ Release from RESET
t
0
2
2
IRDS
t
0
IRR
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3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
