Datasheet

DS1338 I
2
C RTC with 56-Byte NV RAM
3 of 16
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
BAT
= 3.0V, T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER SYMBOL MIN TYP MAX UNITS
V
BAT
Current (OSC ON); V
BAT
= 3.7V, SQW/OUT OFF (Note 7) I
BATOSC1
800 1200 nA
V
BAT
Current (OSC ON); V
BAT
= 3.7V, SQW/OUT ON (32kHz)
(Note 7)
I
BATOSC2
1025 1400 nA
V
BAT
Data-Retention Current (Osc Off); V
BAT
= 3.7V (Note 7) I
BATDAT
10 100 nA
AC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C) (Note 1)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
SCL Clock Frequency f
SCL
Fast mode
100
400
kHz
Standard mode 0 100
Bus Free Time Between STOP
and START Condition
t
BUF
Fast mode 1.3
µs
Standard mode 4.7
Hold Time (Repeated) START
Condition (Note 8)
t
HD:STA
Fast mode 0.6
µs
Standard mode 4.0
LOW Period of SCL Clock t
LOW
Fast mode 1.3
µs
Standard mode 4.7
HIGH Period of SCL Clock t
HIGH
Fast mode 0.6
µs
Standard mode 4.0
Setup Time for Repeated
START Condition
t
SU:STA
Fast mode 0.6
µs
Standard mode 4.7
Data Hold Time (Notes 9, 10) t
HD:DAT
Fast mode 0 0.9
µs
Standard mode 0
Data Setup Time (Note 11) t
SU:DAT
Fast mode 100
ns
Standard mode 250
Rise Time of Both SDA and
SCL Signals (Note 12)
t
R
Fast mode 20 + 0.1C
B
300
ns
Standard mode 20 + 0.1C
B
1000
Fall Time of Both SDA and
SCL Signals (Note 12)
t
F
Fast mode 20 + 0.1C
B
300
ns
Standard mode 20 + 0.1C
B
300
Setup Time for STOP
Condition
t
SU:STO
Fast mode
0.6
µs
Standard mode 4.0
Capacitive Load for Each Bus
Line
C
B
(Note 12) 400 pF
I/O Capacitance (SDA, SCL) C
I/O
(Note 13) 10 pF
Oscillator Stop Flag (OSF)
Delay
t
OSF
(Note 14) 100
ms