DS620 Digital Thermometer and Thermostat
4 of 15
AC ELECTRICAL CHARACTERISTICS
EEPROM AC Electrical Characteristics
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
EEPROM Write Cycle Time
T
WR
-40癈 to +85癈
10
ms
-40癈 d T
A
d +85癈
(Note 1)
10k
20k
EEPROM Writes
N
EEWR
T
A
= +25癈 (Note 1)
40k
80k
writes
EEPROM Data Retention
t
EEDR
-40癈 to +125癈 (Note 2) 10
years
2-Wire AC Electrical Characteristics
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP MAX UNITS
SCL Frequency
f
SCL
0
400
KHz
Bus Free Time Between a
STOP and START Condition
t
BUF
1.3
祍
START and Repeat START
Hold Time from Falling SCL
t
HD:STA
(Note 3, 4)
0.6
祍
Low Period of SCL
t
LOW
(Note 3)
1.3
祍
High Period of SCL
t
HIGH
(Note 3)
0.6
祍
Repeated START Condition
Setup Time to Rising SCL
t
SU:STA
(Note 3)
0.6
祍
Data-Out Hold Time from
Falling SCL
t
HD:DAT
(Note 3)
0
0.9
祍
Data-In Setup Time to Rising
SCL
t
SU:DAT
(Note 3)
100
ns
Rise Time of SDA and SCL
t
R
(Note 3, 5)
20 +
0.1xC
B
1000
ns
Fall Time of SDA and SCL
t
F
(Note 3, 5)
20 +
0.1xC
B
300
ns
STOP Setup Time to Rising
SCL
T
SU:STO
0.6
祍
Capacitive Load for Each BUS
Line
C
B
400
pF
Input Capacitance
C
I
10
pF
Spike Pulse Width that can be
Suppressed by Input Filter
0
50
ns
Note 1: V
DD
must be 2.0V to 3.5V.
Note 2: Write done at 25?/SPAN>C.
Note 3: All values referenced to 0.9 V
DD
and 0.1 V
DD
.
Note 4: After this period the first clock pulse is generated.
Note 5: For example, if C
B
= 300pF, then t
R
(MIN) = t
F
(MIN) = 50ns.
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