Datasheet

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°C to +85°C 10 ms
-40°C ≤ T
A
≤ +85°C
(Note 1)
10k 20k
EEPROM Writes N
EEWR
T
A
= +25°C (Note 1) 40k 80k
writes
EEPROM Data Retention t
EEDR
-40°C to +125°C (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 µs
START and Repeat START
Hold Time from Falling SCL
t
HD:STA
(Note 3, 4) 0.6 µs
Low Period of SCL t
LOW
(Note 3) 1.3 µs
High Period of SCL t
HIGH
(Note 3) 0.6 µs
Repeated START Condition
Setup Time to Rising SCL
t
SU:STA
(Note 3) 0.6 µs
Data-Out Hold Time from
Falling SCL
t
HD:DAT
(Note 3) 0 0.9 µs
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 µs
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°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.