DS1721
 
 
 
15 of 17
DC ELECTRICAL CHARACTERISTICS:
DIGITAL THERMOMETER 
(-55癈 to +125癈; 2.7V ?V
DD
 ?5.5V)
PARAMETER
SYMBOL
CONDITION
MIN    TYP    MAX    UNITS    NOTES
-10癈 to +85癈,
3.0VdV
DD
d5.5V
 
 
?.0
 
-10癈 to +85癈,
2.7VdV
DD
<3.0V
 
 
?.5
 
DS1721
Thermometer Error
T
ERR
 
-55癈 to +125癈
 
 
?.0
 
Resolution
 
 
9
 
12
bits
 
9-bit
Conversions
 
 
93.75
10-bit
Conversions
 
 
187.5
11-bit
Conversions
 
 
375
Conversion Time
t
CONVT
 
12-bit
Conversions
 
 
750
ms
 
 
AC ELECTRICAL CHARACTERISTICS:
2-WIRE INTERFACE 
(-55癈 to +125癈; V
DD
=2.7V to 5.5V)
PARAMETER
SYMBOL
CONDITION
MIN    TYP    MAX    UNITS    NOTES
SCL Clock
Frequency
f
SCL
 
Fast Mode
Standard Mode
0
0
 
400
100
KHz
 
Bus Free Time
Between a STOP
and START
Condition
t
BUF
 
Fast Mode
Standard Mode
1.3
4.7
 
 
 
Hold Time
(Repeated) START
Condition
t
HD:STA
 
Fast Mode
Standard Mode
0.6
4.0
 
 
5
Low Period of
SCL Clock
t
LOW
 
Fast Mode
Standard Mode
1.3
4.7
 
 
 
High Period of
SCL Clock
t
HIGH
 
Fast Mode
Standard Mode
0.6
4.0
 
 
 
Setup Time for a
Repeated START
Condition
t
SU:STA
 
Fast Mode
Standard Mode
0.6
4.7
 
 
 
Data Hold Time
t
HD:DAT
 
Fast Mode
Standard Mode
0
0
 
0.9
6
Data Set-up Time
t
SU:DAT
 
Fast Mode
Standard Mode
100
250
 
 
ns
7
Rise Time of both
SDA and SCL
Signals
t
R
 
Fast Mode
Standard Mode
20+0.1
C
B
 
 
300
1000
ns
7
Fall Time of both
SDA and SCL
Signals
t
F
 
Fast Mode
Standard Mode
20+0.1
C
B
 
 
300
1000
ns
8
Set-up time for
STOP Condition
t
SU:STO
 
Fast Mode
Standard Mode
0.6
4.0
 
 
 
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