Datasheet

(V
DD
= 2.7V to 5.5V; T
A
= -55°C to +125°C.)
Note 1: All voltages are referenced to GND.
Note 2: See Figure 2 for Typical Operating Curves.
Note 3: Specified with T
OUT
pin open; A
0
, A
1
, A
2
= 0V or V
DD
; and f
SCL
≥ 2Hz.
Note 4: Specified with temperature conversions stopped; T
OUT
pin open; SDA = V
DD
; SCL = V
DD
; and A
0
, A
1
, A
2
= 0V or V
DD
.
Note 5: See Timing Diagram in Figure 3. All timing is referenced to 0.9 x V
DD
and 0.1 x V
DD
.
Note 6: After this period the first clock pulse is generated.
Note 7: For example, if C
B
= 300pF, then t
R
[min] = t
F
[min] = 50ns.
(V
DD
= 2.7V to 5.5V; T
A
= -55°C to +125°C.)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
Temperature Conversion Time t
TC
9-bit resolution 93.75
ms
10-bit resolution 187.5
11-bit resolution 375
12-bit resolution 750
SCL Frequency f
SCL
0 400 kHz
Bus Free Time Between a STOP
and START Condition
t
BUF
(Note 5) 1.3 µs
START and Repeated START
Hold Time from Falling SCL
t
HD:STA
(Note 5, 6) 0.6 µs
Low Period of SCL t
LOW
(Note 5) 1.3 µs
High Period of SCL t
HIGH
(Note 5) 0.6 µs
Repeated START Condition
Setup Time to Rising SCL
t
SU:STA
(Note 5) 0.6 µs
Data-Out Hold Time from
Falling SCL
t
HD:DAT
(Note 5) 0 0.9 µs
Data-In Setup Time to
Rising SCL
t
SU:DAT
(Note 5) 100 ns
Rise Time of SDA and SCL t
R
(Note 5, 7) 20 + 0.1C
B
1000 ns
Fall Time of SDA and SCL t
F
(Note 5, 7) 20 + 0.1C
B
300 ns
STOP Setup Time to Rising
SCL
t
SU:STO
(Note 5) 0.6 µs
Capacitive Load for Each
Bus Line
C
B
400 pF
I/O Capacitance C
I/O
10 pF
Input Capacitance C
I
5 pF
Spike Pulse Width that can be
Suppressed by Input Filter
t
SP
0 50 ns
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
EEPROM Write Cycle Time t
wr
4 10 ms
EEPROM Writes N
EEWR
-55°C to +55°C 50k Writes
EEPROM Data Retention t
EEDR
-55°C to +55°C 10 Years
DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
www.maximintegrated.com
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AC Electrical Characteristics
EEPROM AC Electrical Characteristics