Rainbow Electronics DS3231 - Manual (Page 4)

DS3231
Extremely Accurate I
2
C-Integrated
RTC/TCXO/Crystal
4 _____________________________________________________________________
AC ELECTRICAL CHARACTERISTICS
(V CC = V CC(MIN) to V CC(MAX) or V BAT = V BAT(MIN) to V BAT(MAX) , V BAT > V CC , T A = T MIN to T MAX , unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Fast mode 100 400
SCL Clock Frequency f SCL
Standard mode 0 100
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 6)
t HD:STA
Standard mode 4.0
µs
Fast mode 1.3
Low Period of SCL Clock t LOW
Standard mode 4.7
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 7, 8) t HD:DAT
Standard mode 0 0.9
µs
Fast mode 100
Data Setup Time (Note 9) 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 10)
t R
Standard mode
20 +
0.1C B 1000
ns
Fast mode 300 Fall Time of Both SDA and SCL
Signals (Note 10)
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 10)
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
Reset Active Time t RST 250 ms
Oscillator Stop Flag (OSF) Delay t OSF (Note 11) 100 ms
Temperature Conversion Time t CONV 125 200 ms
POWER-SWITCH CHARACTERISTICS
(T A = T MIN to T MAX )
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 12) 250 300 ms