Rainbow Electronics DS2740 - Manual (Page 15)

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 m s
Recovery Time t
REC
1 m s
Write 0 Low Time t
LOW0
60 120 m s
Write 1 Low Time t
LOW1
1 15 m s
Read Data Valid t
RDV
15 m s
Reset Time High t
RSTH
480 m s
Reset Time Low t
RSTL
480 960 m s
Presence Detect High t
PDH
15 60 m s
Presence Detect Low t
PDL
60 240 m s
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
6 16 m s
Recovery Time t
REC
1 m s
Write 0 Low Time t
LOW0
6 16 m s
Write 1 Low Time t
LOW1
1 2 m s
Read Data Valid t
RDV
2 m s
Reset Time High t
RSTH
48 m s
Reset Time Low t
RSTL
48 80 m s
Presence Detect High t
PDH
2 6 m s
Presence Detect Low t
PDL
8 24 m s
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.