DS1308 Datasheet, PDF (3/16 Pages) Dallas Semiconductor – 64 X 8 Serial Real Time Clock

DS1308
Low-Current I²C RTC with 56-Byte NV RAM
DC ELECTRICAL CHARACTERISTICS
(V_CC = 0V, V_BAT = V_BATMIN to V_BATMAX, T_A = -40NC to +85NC, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Battery Current, SQW Off
(Note 5)
Battery Current, SQW On
(Note 6)
Data-Retention Current (Note 7)
I_BAT1
I_BAT2
I_BATDAT
V_BAT = 3V
V_BAT = V_BATMAX
V_BAT = 3V
V_BAT = V_BATMAX
V_BAT = 3V
250
nA
600
550
nA
1100
25
100
nA
AC ELECTRICAL CHARACTERISTICS
(V_CC = V_CCMIN to V_CCMAX, T_A = -40NC to +85NC, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
SCL Clock Frequency
Bus Free Time Between a STOP
and START Condition
f_SCL
t_BUF
(Note 8)
Hold Time (Repeated) START
Condition
t_HD:STA (Note 9)
Low Period of SCL Clock
High Period of SCL Clock
Data Hold Time
Data Setup Time
Setup Time for a Repeated
START Condition
t_LOW
t_HIGH
t_HD:DAT
t_SU:DAT
t_SU:STA
(Notes 10, 11)
(Note 12)
Rise Time of Both SDA and SCL
Signals
t_R
(Note 13)
Fall Time of Both SDA and SCL
Signals
t_F
(Note 13)
Setup Time for STOP Condition
Capacitive Load for each Bus
Line
t_SU:STO
C_B
(Note 13)
SCL Spike Suppression
Oscillator Stop Flag (OSF) Delay
Timeout Interval
t_SP
t_OSF
t_TIMEOUT
(Note 14)
(Note 15)
MIN TYP MAX UNITS
0.03
400
kHz
1.3
Fs
0.6
Fs
1.3
Fs
0.6
Fs
0
0.9
Fs
100
ns
0.6
Fs
20 +
0.1C_B
20 +
0.1C_B
0.6
300
ns
300
ns
Fs
400
pF
60
ns
100
ms
25
35
ms
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