DS3906 datasheet(3/14 Pages) MAXIM

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Triple NV Low Step Size Variable

Resistor Plus Memory

_____________________________________________________________________

NONVOLATILE MEMORY CHARACTERISTICS

(VCC = +2.7V to 5.5V)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

EEPROM Writes

0°C to +70°C. The room temperature

specification is at least 4x better than

specification over 0°C to +70°C.

50,000

AC ELECTRICAL CHARACTERISTICS (See Figure 2)

(VCC = +2.7V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Timing referenced to VIL(MAX) and VIH(MIN).)

Note 1: All voltages referenced to ground.

Note 2: ISTBY is specified with SDA = SCL = VCC, resistor pins floating, and inputs tied to VCC or GND.

Note 3: The DS3906 will not obstruct the SDA and SCL lines if VCC is switched off as long as the voltages applied to these input do

not violate their minimum and maximum input voltage levels.

Note 4: Tested with external resistor of 87

Ω for R0 and R1 and 258Ω for R2 at 25°C.

Note 5: Timing shown is for fast mode (400kHz) operation. This device is also backward compatible with I

2C standard mode timing.

Note 6: CB

⎯total capacitance of one bus line in picofarads.

Note 7: The EEPROM write time begins after a stop condition occurs.

Note 8: Guaranteed by design.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SCL Clock Frequency

fSCL

(Note 5)

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 Set-up Time

tSU:DAT

100

Start Set-up time

tSU:STA

0.6

µs

SDA and SCL Rise Time

(Note 6)

20 +

0.1CB

300

SDA and SCL Fall Time

(Note 6)

20 +

0.1CB

300

Stop Set-up Time

tSU:STO

0.6

µs

SDA and SCL Capacitive

(Note 6)

400

EEPROM Write Time

tWR

(Note 7)

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