Rainbow Electronics DS1996 User Manual
Page 18
DS1996
18 of 18
AC ELECTRICAL CHARACTERISTICS OVERDRIVE SPEED
(-40°C to 70°C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Time Slot
t
SLOT
6
16
µs
Write 1 Low Time
t
LOW1
1
2
µs
Write 0 Low Time
t
LOW0
6
16
µs
Read Data Valid
t
RDV
exactly 2
µs
Release Time
t
RELEASE
0
1.5
4
µs
Read Data Setup
t
SU
1
µs
5
Recovery Time
t
REC
1
µs
Reset Time High
t
RSTH
48
µs
4
Reset Time Low
t
RSTL
48
80
µs
Presence Detect High
t
PDH
2
6
µs
Presence Detect Low
t
PDL
8
24
µs
NOTES:
1. All voltages are referenced to ground.
2. V
PUP
= external pullup voltage.
3. Input load is to ground.
4. An additional reset or communication sequence cannot begin until the reset high time has expired.
5. Read data setup time refers to the time the host must pull the 1-Wire bus low to read a bit. Data is
guaranteed to be valid within 1
µ
s of this falling edge.
6. Capacitance on the data contact could be 800 pF when power is first applied. If a 5 k
Ω
resistor is used
to pullup the data line to V
CC
, 5 ms after power has been applied, the parasite capacitance will not
affect normal communications.
7. The reset low time (t
RSTL
) should be restricted to a maximum of 960 µs, to allow interrupt signaling,
otherwise, it could mask or conceal interrupt pulses.
8. V
IH
is a function of the external pullup resistor and the V
CC
power supply.