Manual

DS2740
15 of 15
Input Logic Low: DQ,
PIO
V
IL
(Note 1) 0.6 V
Output Logic Low:
DQ, PIO
V
OL
I
OL
= 4mA (Note 1) 0.4 V
DQ, PIO Input
Pulldown Current
I
PD
V
DD
= 4.2V,
V
DQ
= 0.4V
0.5
mA
OVD Input Leakage IL
OVD
PIO bit = 1
-1 1
mA
DQ Capacitance C
DQ
50 pF
DQ Low to Sleep Time t
SLEEP
(Note 3) 2.0 2.4 s
ELECTRICAL CHARACTERISTICS: 1-WIRE INTERFACE—STANDARD
SPEED
(2.7V £ V
DD
£ 5.5V; T
A
= -20°C to +70°C.)
PARAMETER SYMBOL MIN TYP MAX UNITS
Time Slot t
SLOT
60 120 ms
Recovery Time t
REC
1 ms
Write 0 Low Time t
LOW0
60 120 ms
Write 1 Low Time t
LOW1
115ms
Read Data Valid t
RDV
15 ms
Reset Time High t
RSTH
480 ms
Reset Time Low t
RSTL
480 960 ms
Presence Detect High t
PDH
15 60 ms
Presence Detect Low t
PDL
60 240 ms
ELECTRICAL CHARACTERISTICS: 1-WIRE INTERFACE—OVERDRIVE
SPEED
(2.7V £ V
DD
£ 5.5V; T
A
= -20°C to +70°C.)
PARAMETER SYMBOL MIN TYP MAX UNITS
Time Slot t
SLOT
616ms
Recovery Time t
REC
1 ms
Write 0 Low Time t
LOW0
616ms
Write 1 Low Time t
LOW1
12ms
Read Data Valid t
RDV
2 ms
Reset Time High t
RSTH
48 ms
Reset Time Low t
RSTL
48 80 ms
Presence Detect High t
PDH
26ms
Presence Detect Low t
PDL
824ms
Note 1:
All voltages are referenced to V
SS
.
Note 2:
Offset performance requires proper circuit layout design free of surface contaminants.
Note 3:
The DS2740 enters the sleep mode 2.0s to 2.4s after DQ goes low.