DS2432 Maxim, DS2432 Datasheet - Page 15

• Manufacturer Part Number: DS2432
• Description: The DS2432 combines 1024 bits of EEPROM, a 64-bit secret, an 8-byte register/control page with up to five user read/write bytes, a 512-bit SHA-1 engine, and a fully-featured 1-Wire interface in a single chip
• Manufacturer: Maxim

ABRIDGED DATA SHEET
AC ELECTRICAL CHARACTERISTICS
OVERDRIVE SPEED
NOTES:
1. All voltages are referenced to ground.
2. V
3. V
4. Input load is to ground.
5. During write operations to the EEPROM the voltage on the 1-Wire bus must not fall below 2.8V.
6. Guaranteed by design, not production tested.
7. Capacitance on the data pin could be 800 pF when power is first applied. If a 5 k resistor is used to
8. The optimal sampling point for the master is as close as possible to the end time of the t
9. Read data setup time refers to the time the host must pull the 1-Wire bus low to read a bit. Data is
10. The minimum recovery times of 5µs (regular speed) and 2µs (Overdrive speed) apply over the full
11. The reset low time (t
Time Slot
Write 1 Low Time
Write 0 Low Time
Read Low Time
Read Data Valid
Release Time
Read Data Setup
Recovery Time
Reset High Time
Reset Low Time
Presence Detect High
Presence Detect Low
Programming Time
SHA-1 Computation Time
pull up the data line to V
normal communications.
without exceeding t
the pullup resistor to recover the line to a high level. For a Read-zero time slot it ensures that a read
will occur before the fastest 1-Wire device releases the line (t
guaranteed to be valid within 1 µs of this falling edge.
voltage and temperature range. Recovery times as short as 1µs (regular and Overdrive speed) should
be acceptable in existing or legacy designs with V
the Electrical Characteristics table are not recommended for new designs.
otherwise, it could mask or conceal interrupt pulses.
PUP
IH
is a function of the external pullup resistor and V
PARAMETER
= external pullup voltage, see Figure 8.
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 µs, to allow interrupt signaling,
, 5 µs after power has been applied the parasite capacitance will not affect
SYMBOL
t
t
RELEASE
t
t
PDHIGH
t
t
PDLOW
t
t
t
t
t
LOWR
t
LOW1
LOW0
t
RSTH
PROG
CSHA
SLOT
RSTL
t
RDV
REC
SU
(V
15 of 17
MIN
Refer to the full version of data sheet.
PUP
48
48
6
1
6
1
0
2
2
8
PUP
= 2.8V to 5.25V, T
PUP
= 5V ±5%. Recovery times shorter than those in
.
TYP
1.5
2
RELEASE
= 0).
MAX
16
16
80
24
10
2
2
4
1
6
A
= -40°C to +85°C.)
UNITS
ms
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
RDV
period
NOTES
10
DS2432
8
9