3

AC ELECTRICAL CHARACTERISTICS

CRYSTAL PARAMETERS

Note 2:

Limits at -40NC are guaranteed by design and not production tested.

Note 3:

Voltage referenced to ground.

Note 4:

Note 5:

Applies to CLKIN/INTA and SQW/INTB only.

Note 6:

The minimum SCL clock frequency is limited by the bus timeout feature, which resets the serial bus interface if SCL is

Note 7:

After this period, the first clock pulse is generated.

Note 8:

nal) to bridge the undefined region of the falling edge of SCL.

Note 9:

met. This is automatically the case if the device does not stretch the low period of the SCL signal. If such a device does

1250ns before the SCL line is released.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SCL Clock Frequency

(Note 6)

400

kHz

Bus Free Time Between a STOP

and START Condition

1.3

F

s

Hold Time (Repeated) START

Condition

(Note 7)

0.6

F

s

Low Period of SCL Clock

1.3

F

s

High Period of SCL Clock

0.6

F

s

Data Hold Time

(Notes 8, 9)

0

0.9

F

s

Data Setup Time

(Note 10)

100

ns

Setup Time for a Repeated

START Condition

0.6

F

s

Rise Time of Both SDA and SCL

Signals

(Note 11)

20 +

300

ns

Fall Time for Both SDA and SCL

Signals

(Note 11)

20 +

300

ns

Setup Time for STOP Condition

0.6

F

s

Capacitive Load for Each Bus

Line

(Note 11)

400

pF

I/O Capacitance

10

pF

SCL Spike Suppression

30

ns

Oscillator Stop Flag (OSF) Delay

(Note 12)

25

100

ms

Timeout Interval

25

35

ms

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Nominal Frequency

32.768

kHz

Series Resistance

ESR

35

80

kI

Load Capacitance

DS1341

6

pF

DS1342

12.5