Datasheet

WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery-backup
mode.
Note 2: Limitsare100%productiontestedatT
A
=+25°CandT
A
=+85°C.Limitsovertheoperatingtemperaturerangeand
relevantsupplyvoltagerangeareguaranteedbydesignandcharacterization.Typicalvaluesarenotguaranteed.
Note 3: SCLonly.
Note 4: SDAandSQW/INT.
Note 5: I
CCA
—SCLatf
SCL
max,V
IL
=0.0V,V
IH
=V
CC
, trickle charger disabled.
Note 6: Specified with the I
2
Cbusinactive,V
IL
=0.0V,V
IH
=V
CC
, trickle charger disabled.
Note 7:V
CC
mustbelessthan3.63Vifthe200Ωresistorisselected.
Note 8: UsingrecommendedcrystalonX1andX2.
Note 9: After this period, the first clock pulse is generated.
Note 10:Adevicemustinternallyprovideaholdtimeofatleast300nsfortheSDAsignal(referredtotheV
IHMIN
oftheSCLsignal)
tobridgetheundefinedregionofthefallingedgeofSCL.
Note 11:Themaximumt
HD:DAT
need only be met if the device does not stretch the low period (t
LOW
)oftheSCLsignal.
Note 12: A fast-mode device can be used in a standard-mode system, but the requirement t
SU:DAT
≥to250nsmustthenbemet.
ThisisautomaticallythecaseifthedevicedoesnotstretchthelowperiodoftheSCLsignal.Ifsuchadevicedoesstretch
thelowperiodoftheSCLsignal,itmustoutputthenextdatabittotheSDAlinet
R(MAX)
+t
SU:DAT
=1000+250=1250ns
beforetheSCLlineisreleased.
Note 13: C
B
—totalcapacitanceofonebuslineinpF.
Note 14:Guaranteedbydesign;notproductiontested.
Note 15: The parameter t
OSF
istheperiodoftimetheoscillatormustbestoppedfortheOSFflagtobeset.
Note 16:ThedevicecandetectanysingleSCLclockheldlowlongerthant
TIMEOUTMIN
. The device’s I
2
C interface is in reset state
andcanreceiveanewSTARTconditionwhenSCLisheldlowforatleastt
TIMEOUTMAX
.Oncethedevicedetectsthiscon-
dition, the SDA output is released. The oscillator must be running for this function to work.
Note 17: This delay applies only if the oscillator is running. If the oscillator is disabled or stopped, no power-up delay occurs.
(V
CC
= MIN to MAX, T
A
=-40°Cto+85°C,unlessotherwisenoted.)(Note2,Figure1)
(T
A
=-40°Cto+85°C,unlessotherwisenoted.)(Note2,Figure2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CapacitiveLoadforEachBus
Line
C
B
(Note 13) 400 pF
I/OCapacitance(SDA,SCL) C
I/O
(Note 14) 10 pF
OscillatorStopFlag(OSF)Delay t
OSF
(Note15) 100 ms
Timeout Interval t
TIMEOUT
(Note16) 25 35 ms
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RecoveryatPower-Up t
REC
(Note 17) 1 2 ms
V
CC
SlewRate;V
PF
to0V t
VCCF
1/50 V/µs
V
CC
SlewRate;0VtoV
PF
t
VCCR
1/1 V/µs
DS1339B Low-Current, I
2
C, Serial Real-Time Clock
For High-ESR Crystals
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AC Electrical Characteristics (continued)
Power-Up/Down Characteristics