RTCs with Constant-Voltage Trickle Charger

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7

POWER-UP/POWER-DOWN CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Recovery at Power-Up

20

200

ms

300

µs

0µs

CAPACITANCE

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Capacitance on All Input Pins

Except X1 and X2

(Note 9)

10

pF

Capacitance on IRQ, SQW, and

DQ Pins

(Note 9)

10

pF

DATA RETENTION (DS12CR887)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Expected Data Retention

5

Years

AC TEST CONDITIONS

PARAMETER

TEST CONDITIONS

Input Pulse Levels (-5)

0 to 3.0V

Input Pulse Levels (-33)

0 to 2.7V

Output Load Including Scope and Jig (-5)

50pF + 1TTL Gate

Output Load Including Scope and Jig (-33)

25pF + 1TTL Gate

Input and Output Timing Measurement Reference Levels

Input-Pulse Rise and Fall Times

5ns

Note 1:

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

Note 2:

All voltages are referenced to ground.

Note 3:

All outputs are open.

Note 4:

Note 5:

Applies to the AD0 to AD7 pins, the IRQ pin, and the SQW pin when each is in a high-impedance state.

Note 6:

The MOT pin has an internal 20k

Ω pulldown.

Note 7:

Measured with a 32.768kHz crystal attached to X1 and X2.

Note 8:

Measured with a 50pF capacitance load.

Note 9:

Guaranteed by design. Not production tested.