Datasheet

I
2
C RTC with Trickle Charger
Maxim Integrated 3
DS1340
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BACKUP
= 3.7V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I
BACKUP1
OSC ON, FT = 0 (Note 9) 800 1150
I
BACKUP2
OSC ON, FT = 1 (Note 9) 850 1250
V
BACKUP
Current
I
BACKUP3
OSC ON, FT = 0, V
BACKUP
= 3.0V,
T
A
= +25°C (Notes 9, 10)
800 1000
nA
V
BACKUP
Data-Retention Current I
BACKUPDR
OSC OFF 25.0 100 nA
AC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC MIN
to V
CC MAX
, T
A
= -40°C to +85°C, unless otherwise noted.) (Notes 1,14, Figure 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Standard mode 0 100
SCL Clock Frequency f
SCL
Fast mode 100 400
kHz
Standard mode 4.7
Bus Free Time Between STOP
and START Conditions
t
BUF
Fast mode 1.3
μs
Standard mode 4.0
Hold Time (Repeated) START
Condition (Note 11)
t
HD:STA
Fast mode 0.6
μs
Standard mode 4.7
Low Period of SCL Clock t
LOW
Fast mode 1.3
μs
Standard mode 4.0
High Period of SCL Clock t
HIGH
Fast mode 0.6
μs
Standard mode 0 0.9
Data Hold Time (Notes 12, 13) t
HD:DAT
Fast mode 0 0.9
μs
Standard mode 250
Data Setup Time (Note 14) t
SU:DAT
Fast mode 100
ns
Standard mode 4.7
START Setup Time t
SU:STA
Fast mode 0.6
μs
Standard mode 20 + 0.1C
B
1000
Rise Time of SDA and SCL
Signals (Note 15)
t
R
Fast mode 20 + 0.1C
B
300
ns
Standard mode 20 + 0.1C
B
300
Fall Time of SDA and SCL
Signals (Note 15)
t
F
Fast mode 20 + 0.1C
B
300
ns
Standard mode 4.7
Setup Time for STOP Condition t
SU:STO
Fast mode 0.6
μs
Capacitive Load for Each Bus
Line
C
B
(Note 15) 400 pF
I/O Capacitance (SCL, SDA) C
I/O
10 pF
Pulse Width of Spikes that Must
be Suppressed by the Input
Filter
t
SP
Fast mode 30 ns
Oscillator Stop Flag (OSF) Delay t
OSF
(Note 16) 100 ms