Datasheet

DS1312
6 of 12
V
CC
/V
BAT
Switch Point
V
SW
2.6
2.7
2.8
V
2
Output Current @ 2.4V
I
OH
-1
mA
8, 11
Output Current @ 0.4V
I
OL
4
mA
8, 11
Input Leakage
I
IL
-1.0
+1.0
µA
Output Leakage
I
LO
-1.0
+1.0
µA
Battery Monitoring Test Load
R
INT
0.8
1.2
1.5
MΩ
DC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; V
CCI
< V
BAT
; V
CCI
< V
SW
)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Battery Current
I
BAT
100
nA
3
Battery Backup Current
I
CCO2
500
µA
7
Supply Voltage
V
CCO
V
BAT
-0.2
V
2
CEO
Output
V
OHL
V
BAT
-0.2
V
2, 9
CAPACITANCE (T
A
= +25°C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Input Capacitance (
CEI
, TOL)
C
IN
7
pF
Output Capacitance
(
CEO
,
BW
,
RST
)
C
OUT
7
pF
AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; V
CCI
> V
CCTP
)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
CEI
to
CEO
Propagation Delay
t
PD
5
10
ns
CE
Pulse Width
t
CE
1.5
µs
12
V
CC
Valid to End of
Write Protection
t
REC
12
125
ms
10
V
CC
Valid to
CEI
Inactive
t
PU
2
ms
V
CC
Valid to
RST
Inactive
t
RPU
150
200
350
ms
11
V
CC
Valid to
BW
Valid
t
BPU
1
s
11
AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; V
CCI
< V
CCTP
)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
V
CC
Slew Rate
t
F
150
µs
V
CC
Fail Detect to
RST
Active
t
RPD
5
15
µs
11
V
CC
Slew Rate
t
R
150
µs
AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; V
CCI
> V
CCTP
)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Battery Test to
BW
Active
t
BW
1
s
11
Battery Test Cycle-Normal
t
BTCN
24
hr
Battery Test Cycle-Warning
t
BTCW
5
s
Battery Test Pulse Width
t
BTPW
1
s
Battery Detach to Battery Attach
t
BDBA
7
s
Battery Attach to
BW
Inactive
t
BABW
1
s
11