Rainbow Electronics DS1338 - Manual (Page 3)

DS1338 I 2 C RTC with 56-Byte NV RAM
3 of 15
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, T
A
= -40°C to +85°C.) (Note 1)
PARAMETER SYMBOL MIN TYP MAX UNITS
V
BAT
Current (OSC ON); V
BAT
= 3.7V, SQW/OUT OFF (Note 7) I
BATOSC1
400 1200 nA
V
BAT
Current (OSC ON); V
BAT
= 3.7V, SQW/OUT ON (32kHz)
(Note 7)
I
BATOSC2
570 1400 nA
V
BAT
Data-Retention Current (Osc Off); V
BAT
= 3.7V (Note 7) I
BATDAT
10 100 nA
AC ELECTRICAL CHARACTERISTICS
(T
A
= -40°C to +85°C) (Note 1)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
Fast mode 100 400
SCL Clock Frequency f
SCL
Standard mode 100
kHz
Fast mode 1.3
Bus Free Time Between STOP
and START Condition
t
BUF
Standard mode 4.7
ms
Fast mode 0.6
Hold Time (Repeated) START
Condition (Note 8)
t
HD:STA
Standard mode 4.0
ms
Fast mode 1.3
LOW Period of SCL Clock t
LOW
Standard mode 4.7
ms
Fast mode 0.6
HIGH Period of SCL Clock t
HIGH
Standard mode 4.0
ms
Fast mode 0.6
Setup Time for Repeated
START Condition
t
SU:STA
Standard mode 4.7
ms
Fast mode 0 0.9
Data Hold Time (Notes 9, 10) t
HD:DAT
Standard mode 0
ms
Fast mode 100
Data Setup Time (Note 11) t
SU:DAT
Standard mode 250
ns
Fast mode 20 + 0.1C
B
300
Rise Time of Both SDA and
SCL Signals (Note 12)
t
R
Standard mode 20 + 0.1C
B
1000
ns
Fast mode 20 + 0.1C
B
300
Fall Time of Both SDA and
SCL Signals (Note 12)
t
F
Standard mode 20 + 0.1C
B
300
ns
Fast mode 0.6 Setup Time for STOP
Condition
t
SU:STO
Standard mode 4.0
ms
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