DS2433 Maxim Integrated Products, DS2433 Datasheet - Page 20

• Manufacturer Part Number: DS2433
• Description: RAM Miscellaneous
• Manufacturer: Maxim Integrated Products

AC ELECTRICAL CHARACTERISTICS
OVERDRIVE SPEED
NOTES:
1) All voltages are referenced to ground.
2) V
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
6) Capacitance on the data pin could be 800pF when power is first applied. If a 5k Ω resistor is used to
7) The reset low time (t
8) V
9) Under certain low voltage conditions V
10) The Copy Scratchpad takes 5ms maximum during which the voltage on the 1-Wire bus must not fall
11) During the execution of the Copy Scratchpad command the DS2433 automatically erases the memory
12) The optimal sampling point for the master is as close as possible to the end time of the t
13) The duration of the low pulse sent by the master should be a minimum of 1μs with a maximum value
Time Slot
Write 1 Low Time
Write 0 Low Time
Read Low Time
Read Data Valid
Release Time
Read Data Setup
Recovery Time
Reset Time High
Reset Time Low
Presence Detect High
Presence Detect Low
guaranteed to be valid within 1 μ s of this falling edge.
pull up the data line to V
normal communications.
otherwise, it could mask or conceal interrupt pulses.
guarantee a Presence Pulse.
below 2.8V.
locations to be written to. No extra steps need to be taken by the bus master.
without exceeding t
the pullup resistor to recover to a high level. For a read-zero time slot, it ensures that a read will occur
before the fastest device(s) release the line.
as short as possible to allow time for the pullup resistor to recover the line to a high level before the 1-
Wire device samples in the case of a write-one time or before the master samples in the case of a read-
one time.
PUP
IH
is a function of the external pullup resistor and V
PARAMETER
= external pullup voltage.
RDV
RSTL
. For the case of a read-one time slot, this maximizes the amount of time for
PUP
) should be restricted to a maximum of 960 μ s, to allow interrupt signaling,
, 5 μ s after power has been applied the parasite capacitance will not affect
SYMBOL
t
t
RELEASE
t
t
PDHIGH
t
t
PDLOW
t
t
t
LOWR
t
LOW1
LOW0
t
RSTH
SLOT
RSTL
RDV
t
REC
SU
ILMAX
20 of 20
may have to be reduced to as much as 0.5V to always
MIN
48
48
6
1
6
1
0
1
2
8
(V
PUP
PUP
.
TYP
1.5
= 2.8V to 6.0V;-40°C to +85°C)
2
MAX
16
16
80
24
2
2
4
1
6
UNITS
μ s
μ s
μ s
μ s
μ s
μ s
μ s
μ s
μ s
μ s
μ s
μ s
RDV
NOTES
13
13
12
5
4
period