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Extremely Accurate I2C RTC with
Integrated Crystal and SRAM
AC ELECTRICAL CHARACTERISTICS
(Active supply (see Table 1) = 2.3V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Fast mode
100
400
SCL Clock Frequency
fSCL
Standard mode
0.04
100
kHz
Fast mode
1.3
Bus Free Time Between STOP
and START Conditions
tBUF
Standard mode
4.7
s
Fast mode
0.6
Hold Time (Repeated) START
Condition (Note 7)
tHD:STA
Standard mode
4.0
s
Fast mode
1.3
25,000
Low Period of SCL Clock
tLOW
Standard mode
4.7
25,000
s
Fast mode
0.6
High Period of SCL Clock
tHIGH
Standard mode
4.0
s
Fast mode
0
0.9
Data Hold Time (Notes 8, 9)
tHD:DAT
Standard mode
0
0.9
s
Fast mode
100
Data Setup Time (Note 10)
tSU:DAT
Standard mode
250
ns
Fast mode
0.6
Start Setup Time
tSU:STA
Standard mode
4.7
s
Fast mode
300
Rise Time of Both SDA and SCL
Signals (Note 11)
tR
Standard mode
20 +
0.1CB
1000
ns
Fast mode
300
Fall Time of Both SDA and SCL
Signals (Note 11)
tF
Standard mode
20 +
0.1CB
300
ns
Fast mode
0.6
Setup Time for STOP Condition
tSU:STO
Standard mode
4.7
s
Capacitive Load for Each Bus
Line (Note 11)
CB
400
pF
Capacitance for SDA, SCL
CI/O
10
pF
Pulse Width of Spikes That Must
Be Suppressed by the Input Filter
tSP
30
ns
Pushbutton Debounce
PBDB
250
ms
Interface Timeout
tIF
(Note 12)
25
35
ms
Reset Active Time
tRST
250
ms
Oscillator Stop Flag (OSF) Delay
tOSF
(Note 13)
100
ms
Temperature Conversion Time
tCONV
125
200
ms
POWER-SWITCH CHARACTERISTICS
(TA = -40°C to +85°C)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VCC Fall Time; VPF(MAX) to
VPF(MIN)
tVCCF
300
s
VCC Rise Time; VPF(MIN) to
VPF(MAX)
tVCCR
0s
Recovery at Power-Up
tREC
(Note 14)
125
300
ms
DS3232
4
Maxim Integrated
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