Datasheet

Extremely Accurate I
2
C RTC with
Integrated Crystal and SRAM
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
0µs
Recovery at Power-Up t
REC
(Note 14) 125 300 ms
DS3232
4
Maxim Integrated