DS2407 Dallas Semiconducotr, DS2407 Datasheet - Page 31

• Manufacturer Part Number: DS2407
• Description: Dual Addressable Switch Plus 1K.Bit Memory
• Manufacturer: Dallas Semiconducotr

PIO SINK CURRENT
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 guaranteed
6. V
7. Capacitance on the data pin could be 800 pF when power is first applied. If a 5k resistor is used to pull up the
8. t
9. Input resistance is to ground.
10. V
11. If the current at PIO–A reaches 200 mA the gate voltage of the output transistor will be reduced to limit the sink
12. PIO–A has a controlled turn–on output. The indicated currents are DC values. At V
13. Under certain low voltage conditions V
14. The input load current may be as high as 100 A after a power–on reset until a memory function command byte
15. If the device is disconnected from the 1–Wire bus (data pin floating) channel A may lose its output status even
16. Without V
to be valid within 1 s of this falling edge and will remain valid for 14 s minimum (15 s total from falling edge
on 1–Wire bus).
tor and V
data line to V
tions.
current to 200 mA. The user–supplied circuitry should limit the current flow through the PIO–transistor to no more
than 100 mA. Otherwise the DS2407 may be damaged.
current typically reaches 80% of its DC value 1 s after turning on the transistor.
a presence pulse.
has been sent as well as during the execution of a ROM function command.
if V
channel A.
RSTL
PUP
IH
CC
CC
is a function of the chip–internal supply voltage. This voltage is determined by either the external pull–up resis-
must be at least 4.0V if it is to be connected during a programming pulse.
, V
should be limited to maximum 5 ms. Otherwise the DS2407 may perform a power–on reset.
is connected. A resistor of approximately 100 k
PUPA
I
@ 0.4V
SA
PUP
CC
, I
SB
, V
PUP
supply, V
or the V
PUPB
, 5 s after power has been applied the parasite capacitance will not affect normal communica-
100 mA
90 mA
80 mA
70 mA
60 mA
50 mA
40 mA
30 mA
20 mA
10 mA
= external pull–up voltage.
CC
IH
for either PIO pin should always be greater than or equal to V
supply, whichever is higher.
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2.8V
ILMAX
may have to be reduced to as much as 0.5V to always guarantee
4V
between V
5V
CC
and data will maintain the status of
6V
PUP
MAX.
MIN.
MAX.
MIN.
= 4.0V or higher the sink
PIO–A
PIO–B
PUP
V
PUP
–0.3V.
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DS2407