DS2433X データシートの表示（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS2433X

4 kbit 1-Wire EEPROM

Dallas Semiconductor -> Maxim Integrated 

AC ELECTRICAL CHARACTERISTICS

OVERDRIVE SPEED

PARAMETER

SYMBOL MIN

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

tSLOT

6

tLOW1

1

tLOW0

6

tLOWR

1

tRDV

tRELEASE

0

tSU

tREC

1

tRSTH

48

tRSTL

48

tPDHIGH

2

tPDLOW

8

DS2433

(VPUP=2.8V to 6.0V;-40°C to +85°C)

TYP MAX UNITS NOTES

16

µs

2

µs

16

µs

2

µs

exactly 2

µs

1.5

4

µs

1

µs

5

µs

µs

4

80

µs

6

µs

24

µs

NOTES:

1. All voltages are referenced to ground.

2. VPUP = 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 µs of this falling edge.

6. Capacitance on the data pin could be 800 pF when power is first applied. If a 5 kΩ resistor is used to

pull up the data line to VPUP, 5 µs after power has been applied the parasite capacitance will not affect

normal communications.

7. The reset low time (tRSTL) should be restricted to a maximum of 960 µs, to allow interrupt signaling,

otherwise, it could mask or conceal interrupt pulses.

8. VIH is a function of the external pullup resistor and VPUP.

9. Under certain low voltage conditions VILMAX may have to be reduced to as much as 0.5V to always

guarantee a Presence Pulse.

10. The Copy Scratchpad takes 5 ms maximum during which the voltage on the 1-Wire bus must not fall

below 2.8V.

11. During the execution of the Copy Scratchpad command the DS2433 automatically erases the memory

locations to be written to. No extra steps need to be taken by the bus master.

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