DS1621 Datasheet, PDF (15/16 Pages) Dallas Semiconductor – Digital Thermometer and Thermostat

AC ELECTRICAL CHARACTERISTICS
PARAMETER SYMBOL CONDITION
Temperature
T_TC
Conversion Time
NV Write Cycle
Time
t_WR
0°C to 70°C
SCL Clock
Frequency
f_SCL
Fast Mode
Standard Mode
Bus Free Time
Between a STOP
t_BUF
Fast Mode
Standard Mode
and START
Condition
Hold Time
(Repeated) START
t_HD:STA
Fast Mode
Standard Mode
Condition
Low Period of SCL
Clock
T_LOW
Fast Mode
Standard Mode
High Period of SCL
Clock
T_HIGH
Fast Mode
Standard Mode
Setup Time for a
Repeated START
t_SU:STA
Fast Mode
Standard Mode
Condition
Data Hold Time
t_HD:DAT
Fast Mode
Standard Mode
Data Setup Time
t_SU:DAT
Fast Mode
Standard Mode
Rise Time of Both
SDA and SCL
t_R
Fast Mode
Standard Mode
Signals
Fall Time of both
SDA and SCL
t_F
Fast Mode
Standard Mode
Signals
Setup time for
STOP Condition
t_SU:STO
Fast Mode
Standard Mode
Capacitative Load
C_b
for each Bus Line
All values referred to V_IH=0.9 V_DD and V_IL=0.1 V_DD.
DS1621
(-55°C to +125°C; V_DD = 2.7V to 5.5V)
MIN TYP MAX UNITS NOTES
750 ms
4
10
ms
10
0
400 KHz
0
100
1.3
µs
4.7
0.6
4.0
1.3
4.7
0.6
4.0
0.6
4.7
0
0
100
250
20+0.1C_B
20+0.1C_B
0.6
4.0
µs
5
µs
µs
µs
0.9
µs
6, 7
ns
8
300
ns
9
1000
300
ns
9
300
µs
400
pF
AC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL MIN
Input Capacitance
C_I
(-55°C to +125°C; V_DD = 2.7V to 5.5V)
TYP MAX
UNITS
NOTES
5
pF
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