Real-Time Clocks
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BAT
= 3.0V, T
A
= Over the operating range, unless otherwise noted.) (Note 1)
PARAMETER
V
BAT
or V
BAUX
Current (Oscillator
On); T
A
= +25°C, V
BAT
= 3.0V
V
BAT
or V
BAUX
Current
(Oscillator Off)
SYMBOL
I
BAT
I
BATDR
(Note 7)
(Note 7)
CONDITIONS
MIN
TYP
500
50
MAX
700
400
UNITS
nA
nA
DS17285/DS17287/DS17485/DS17487/DS17885/DS17887
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +4.5V to +5.5V,
T
A
= Over the operating range, unless otherwise noted.) (Note 2)
PARAMETER
Cycle Time
Pulse Width,
RD
or
WR
Low
Pulse Width,
RD
or
WR
High
Input Rise and Fall
Chip-Select Setup Time Before
RD
or
WR
Chip-Select Hold Time
Read-Data Hold Time
Write-Data Hold Time
Address Setup Time to ALE Fall
Address Hold Time to ALE Fall
RD
or
WR
High Setup to ALE
Rise
Pulse Width ALE High
Delay Time ALE Low to
RD
Low
Output Data Delay Time from
RD
Data Setup Time
IRQ
Release from
RD
SYMBOL
t
CYC
PW
RWL
PW
RWH
t
R
, t
F
t
CS
t
CH
t
DHR
t
DHW
t
ASL
t
AHL
t
ASD
PW
ASH
t
ASED
t
DDR
t
DSW
t
IRD
(Note 8)
20
0
10
0
20
10
25
40
30
20
30
2
120
50
CONDITIONS
MIN
240
120
80
30
TYP
MAX
DC
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
_____________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
