DS3231M_1112 datasheet(4/20 Pages) MAXIM

Part #	DS3231M_1112

Description	±5ppm, I2C Real-Time Clock

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Manufacturer	MAXIM [Maxim Integrated Products]

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±5ppm, I2C Real-Time Clock

4

AC_ELECTRICAL_CHARACTERISTICS—I2C_INTERFACE

(VCC or VBAT = +2.3V to +5.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, VBAT = +3.0V,

and TA = +25NC, unless otherwise noted.) (Note 5, Figure 1)

Note_1:_All voltages are referenced to ground.

Note_2:_The parameter tOSF is the period of time the oscillator must be stopped for the OSF flag to be set.

Note_3: Includes the temperature conversion current (averaged).

Note_4: This delay applies only if the oscillator is enabled. If the EOSC bit is 1, tREC is bypassed and RST immediately goes high.

The state of RST does not affect the I2C interface or RTC functions.

Note_5:__Interface timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with standard mode

I2C timing.

Note_6:_CB: Total capacitance of one bus line in picofarads.

Note_7:_Guaranteed by design; not 100% production tested.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SCL Clock Frequency

fSCL

0

400

kHz

Bus Free Time Between STOP

and START Conditions

tBUF

1.3

F

s

Hold Time (Repeated) START

Condition

tHD:STA

0.6

F

s

Low Period of SCL

tLOW

1.3

F

s

High Period of SCL

tHIGH

0.6

F

s

Data Hold Time

tHD:DAT

0

0.9

F

s

Data Set-Up Time

tSU:DAT

100

ns

START Set-Up Time

tSU:STA

0.6

F

s

SDA and SCL Rise Time

tR

(Note 6)

20 +

0.1CB

300

ns

SDA and SCL Fall Time

tF

(Note 6)

20 +

0.1CB

300

ns

STOP Set-Up Time

tSU:STO

0.6

F

s

SDA, SCL Input Capacitance

CBIN

(Note 7)

10

pF

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