DS3902 datasheet(3/11 Pages) MAXIM

3 / 11 page

Dual, NV, Variable Resistors

with User EEPROM

_____________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (Figure 1)

(VCC = +2.4V to +5.5V, TA = -40°C to +95°C, unless otherwise noted. Timing referenced to VIL(MAX) and VIH(MIN).)

Note 1: All voltages referenced to ground.

Note 2: ISTBY specified for the inactive state measured with SDA = SCL = VCC, ADD_SEL = GND, and with H0 and H1 floating.

Note 3: Absolute linearity is the difference of measured value from expected value at resistor position. Expected value is from the

measured minimum position to measured maximum position.

Note 4: Relative linearity is the deviation of an LSB resistor setting change vs. the expected LSB change. Expected LSB slope of the

straight line is the typical operating curves from the measured minimum position to measured maximum position.

Note 5: See the Typical Operating Characteristics section.

Note 6: Guaranteed by design.

Note 7: Timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with I2C standard mode.

Note 8: CB—total capacitance of one bus line in picofarads.

Note 9: EEPROM write begins after a STOP condition occurs.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SCL Clock Frequency

fSCL

(Note 7)

400

kHz

Bus Free Time Between STOP

and START Conditions

tBUF

1.3

µs

Hold Time (Repeated)

START Condition

tHD:STA

0.6

µs

Low Period of SCL

tLOW

1.3

µs

High Period of SCL

tHIGH

0.6

µs

Data Hold Time

tHD:DAT

0.9

µs

Data Setup Time

tSU:DAT

100

µs

Start Setup Time

tSU:STA

0.6

µs

SDA and SCL Rise Time

(Note 8)

20 +

0.1 x CB

300

SDA and SCL Fall Time

(Note 8)

20 +

0.1 x CB

300

Stop Setup Time

tSU:STO

0.6

µs

SDA and SCL Capacitive Loading

(Note 8)

400

EEPROM Write Time

tWR

(Note 9)

Input Capacitance

5pF

Startup Time

tST

(Note 6)

NONVOLATILE MEMORY CHARACTERISTICS

(VCC = +2.4V to +5.5V, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

EEPROM Writes

+70°C (Note 6)

50,000

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