RTC with Constant-Voltage Trickle Charger
DC ELECTRICAL CHARACTERISTICS (DS12R885 Only)
(V
CC
= 0V, V
BACKUP
= 3.2V,
T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
V
BACKUP
Current (OSC On);
T
A
= +25°C, V
BACKUP
= 3.0V
V
BACKUP
Current (Oscillator Off)
SYMBOL
I
BACKUP2
(Note 7)
CONDITIONS
MIN
TYP
800
MAX
1000
100
UNITS
nA
nA
DS12R885/DS12CR887/DS12R887
I
BACKUPDR
(Note 7)
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 4.5V to 5.5V,
T
A
= -40°C to +85°C.) (Note 1)
PARAMETER
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
SYMBOL
t
CYC
PW
EL
PW
EH
t
R
, t
F
t
RWH
t
RWS
t
CS
t
CH
t
DHR
t
DHW
t
ASL
t
AHL
t
ASD
PW
ASH
t
ASED
t
DDR
t
DSW
t
RWL
t
IRDS
t
IRR
(Note 8)
0
10
5
0
5
0
20
5
10
30
35
15
50
5
0
0
2
2
60
35
CONDITIONS
MIN
180
80
65
30
TYP
MAX
DC
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
µs
µs
_____________________________________________________________________
3
DALLAS [ DALLAS SEMICONDUCTOR ]
