DS1339 I

5 of 20

POWER-UP/DOWN CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Recovery at Power-Up

(Note 16)

2

ms

300

µs

0

µs

WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed when device is in

battery-backup mode.

Note 2:

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

Note 3:

SCL only.

Note 4:

SDA and SQW/

INT.

Note 5:

Note 6:

Specified with the I

Note 7:

Note 8:

Using recommended crystal on X1 and X2.

Note 9:

Guaranteed by design; not production tested.

Note 10:

After this period, the first clock pulse is generated.

Note 11:

the undefined region of the falling edge of SCL.

Note 12:

Note 13:

automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW

is released.

Note 14:

Note 15:

Note 16:

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

Figure 1. Power-Up/Down Timing

OUTPUTS

V

PF(MAX)

V

PF(MIN)

INPUTS

HIGH-Z

DON'T CARE

VALID

RECOGNIZED

RECOGNIZED

VALID

t

VCCF

t

VCCR

t

REC