DS3232
Extremely Accurate I
2
C RTC with
Integrated Crystal and SRAM
4
_____________________________________________________________________
AC ELECTRICAL CHARACTERISTICS
(Active supply (see Table 1) = 2.3V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Fast mode
100
400
SCL Clock Frequency
f
SCL
Standard mode
0.04
100
kHz
Fast mode
1.3
Bus Free Time Between STOP
and START Conditions
t
BUF
Standard mode
4.7
µs
Fast mode
0.6
Hold Time (Repeated) START
Condition (Note 7)
t
HD:STA
Standard mode
4.0
µs
Fast mode
1.3
25,000
Low Period of SCL Clock
t
LOW
Standard mode
4.7
25,000
µs
Fast mode
0.6
High Period of SCL Clock
t
HIGH
Standard mode
4.0
µs
Fast mode
0
0.9
Data Hold Time (Notes 8, 9)
t
HD:DAT
Standard mode
0
0.9
µs
Fast mode
100
Data Setup Time (Note 10)
t
SU:DAT
Standard mode
250
ns
Fast mode
0.6
Start Setup Time
t
SU:STA
Standard mode
4.7
µs
Fast mode
300
Rise Time of Both SDA and SCL
Signals (Note 11)
t
R
Standard mode
20 +
0.1C
B
1000
ns
Fast mode
300
Fall Time of Both SDA and SCL
Signals (Note 11)
t
F
Standard mode
20 +
0.1C
B
300
ns
Fast mode
0.6
Setup Time for STOP Condition
t
SU:STO
Standard mode
4.7
µs
Capacitive Load for Each Bus
Line (Note 11)
C
B
400
pF
Capacitance for SDA, SCL
C
I/O
10
pF
Pulse Width of Spikes That Must
Be Suppressed by the Input Filter
t
SP
30
ns
Pushbutton Debounce
PB
DB
250
ms
Interface Timeout
t
IF
(Note 12)
25
35
ms
Reset Active Time
t
RST
250
ms
Oscillator Stop Flag (OSF) Delay
t
OSF
(Note 13)
100
ms
Temperature Conversion Time
t
CONV
125
200
ms
POWER-SWITCH CHARACTERISTICS
(T
A
= -40°C to +85°C)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
Fall Time; V
PF(MAX)
to
V
PF(MIN)
t
VCCF
300
µs
V
CC
Rise Time; V
PF(MIN)
to
V
PF(MAX)
t
VCCR
0
µs
Recovery at Power-Up
t
REC
(Note 14)
125
300
ms
