DS1374 datasheet(4/17 Pages) MAXIM

4 / 17 page

I2C, 32-Bit Binary Counter Watchdog RTC with

Trickle Charger and Reset Input/Output

_____________________________________________________________________

AC ELECTRICAL CHARACTERISTICS

(VCC = VCC(MIN) to VCC(MAX), TA = -40°C to +85°C, unless otherwise noted.) (Note 1) (Figure 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Fast mode

100

400

SCL Clock Frequency (Note 16)

fSCL

Standard mode

100

kHz

Fast mode

1.3

Bus Free Time Between STOP

and START Conditions

tBUF

Standard mode

4.7

µs

Fast mode

0.6

Hold Time (Repeated) START

Condition (Note 17)

tHD:STA

Standard mode

4.0

µs

Fast mode

1.3

Low Period of SCL Clock

tLOW

Standard mode

4.7

µs

Fast mode

0.6

High Period of SCL Clock

tHIGH

Standard mode

4.0

µs

Fast mode

0.9

Data Hold Time (Notes 18, 19)

tHD:DAT

Standard mode

0.9

µs

Fast mode

100

Data Setup Time (Note 20)

tSU:DAT

Standard mode

250

Fast mode

0.6

Start Setup Time

tSU:STA

Standard mode

4.7

µs

Fast mode

300

Rise Time of Both SDA and SCL

Signals (Note 16)

Standard mode

20 +

0.1CB

1000

Fast mode

300

Fall Time of Both SDA and SCL

Signals (Note 16)

Standard mode

20 +

0.1CB

300

Fast mode

0.6

Setup Time for STOP Condition

tSU:STO

Standard mode

4.7

µs

Capacitive Load for Each Bus Line

(Note 16)

400

I/O Capacitance (SDA, SCL)

CI/O

(Note 21)

Pulse Width of Spikes That Must

be Suppressed by the Input Filter

tSP

Fast mode

Pushbutton Debounce

PBDB

(Figure 2)

250

Reset Active Time

tRST

(Figure 2)

250

Oscillator Stop Flag (OSF) Delay

tOSF

(Note 22)

100

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