DS1821
16 of 18
AC ELECTRICAL CHARACTERISTICS:
(-55°C to +125°C; V
DD
=3.6V to 5.5V)
PARAMETER
SYMBOL MIN TYP MAX UNITS NOTES
Temperature Conversion Time
t
CONV
0.4
1.0 s
EEPROM Write Time
t
WR
10
50
ms
Time Slot
t
SLOT
60 120 µs 1
Recovery Time
t
REC
1 µs 1
Write 0 Low Time
t
LOW0
60 120 µs 1
Write 1 Low Time
t
LOW1
1 15 µs 1
Read Data Valid
t
RDV
15
µs 1
Reset Time High
t
RSTH
480 µs 1
Reset Time Low
t
RSTL
480 µs 1,2
Presence Detect High
t
PDHIGH
15 60 µs
1
Presence Detect Low
t
PDLOW
60 240 µs
1
V
DD
Low to Mode Toggle Clock Low
t
PC
100
ns 1,3
Mode Toggle Clock 16 High to V
DD
High
t
CP
100
ns 1
Mode Toggle Clock Pulse Low Time
t
CL
0.1
10 µs 1
Mode Toggle Clock Pulse High Time
t
CH
0.1
µs 1
Mode Toggle Clock High-to-Low or
Low-to-High Transition Time
t
T
100
ns 1
Capacitance C
IN/OUT
25 pF
NOTES:
1.
Refer to timing diagrams in Figure 13.
2.
If t
RSTL
> 960
μ
s, a power-on-reset may occur.
3.
Time required for part to disable thermostat output.
