DS2704: 1280-Bit EEPROM with SHA-1 Authentication

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AC ELECTRICAL CHARACTERISTICS: 1-WIRE INTERFACE

(2.5V

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

STANDARD BUS TIMING

Time Slot

60

120

ms

Recovery Time

1

ms

Write 0 Low Time

60

120

ms

Write 1 Low Time

1

15

ms

Read Data Valid

15

ms

Reset Time High

480

ms

Reset Time Low

480

960

ms

Presence Detect High

15

60

ms

Presence Detect Low

60

240

ms

OVERDRIVE BUS TIMING

Time Slot

6

16

ms

Recovery Time

1

ms

Write 0 Low Time

6

16

ms

Write 1 Low Time

1

2

ms

Read Data Valid

2

ms

Reset Time High

48

ms

Reset Time Low

48

80

ms

Presence Detect High

2

6

ms

Presence Detect Low

8

24

ms

DQ Capacitance

60

pF

Note 1:

Note 2:

EEPROM programming temperature range limited to 0

°C to 50°C.

Note 3:

°C.

Note 4:

DQ = VDD.

Note 5:

Current measured with minimum bus timing while the master issues: 1-Wire Reset, Skip ROM, Write Challenge, Write

Repeated 0’s until end of measurement.