Rainbow-electronics DS1339 Bedienungsanleitung PDF herunterladen (Seite 18)

DS1339

18 of 18

POWER-UP DOWN CHARACTERISTICS (T

= -40°C to +85°C) (Note 12)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Recovery at Power-up t

REC

2ms13

Fall Time; V

PF(MAX)

to V

PF(MIN)

VCCF

300

Rise Time; V

PF(MIN)

to V

PF(MAX)

VCCR

Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when the device

is in backup-battery mode.

NOTES:

1) SCL only.

2) SDA, and SQW/ INT .

3) I

CCA

: SCL at f

max, V

= 0.0V, V

= V

, trickle charge disabled.

4) Specified with 2-wire bus inactive, V

= 0.0V, V

= V

, trickle charge disabled.

5) After this period, the first clock pulse is generated.

6) A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the

IHMIN

of the SCL signal) in order to bridge the undefined region of the falling edge of SCL.

7) The maximum t

HD:DAT

has only to be met if the device does not stretch the LOW period (t

LOW

) of the

SCL signal.

8) C

: Total capacitance of one bus line in pF.

9) A fast-mode device can be used in a standard-mode system, but the requirement t

SU:DAT

³ to 250ns

must then be met. This is automatically the case if the device does not stretch the LOW period of the

SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next

data bit to the SDA line t

RMAX

SU:DAT

= 1000 + 250 = 1250ns before the SCL line is released.

10) Using recommended crystal on X1 and X2.

11) The parameter t

OSF

is the period of time the oscillator must be stopped in order for the OSF flag to be

set over the voltage range of 0V  V

 V

CCMAX

and 1.3V  V

BACKUP

 3.7V.

12) Limits at -40°C are guaranteed by design and are not production tested.

13) This delay applies only if the oscillator is running. If the oscillator is disabled or stopped, no power-

up delay occurs.

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