DS1643/DS1643P

Nonvolatile Timekeeping RAM

www.artschip.com

5

BATTERY LONGEVITY

The DS1643 has a lithium power source that is designed to provide energy for clock activity, and clock and RAM data retention

when the Vcc supply is not present. The capability of this internal power supply is sufficient to power the DS1643 continuously for

the life of the equipment in which it is installed. For specification purposes, the life expectancy is 10 years at 25

℃ with the internal

clock oscillator running in the absence of Vcc power. Each DS1643 is shipped from ARTSCHIP Semiconductor with its lithium

energy source is enabled for battery backup operation. Actual life expectancy of the Ds1643 will be much longer than 10 years

since no lithium battery energy is consumed when Vcc is present.

ABSOLUTE MAXIMUM RATINGS *

Voltage on Any Pin Relative to Ground

-0.3V to +70V

Operating Temperature

0

℃ to 70℃

Storage Temperature

-40

℃ to +85℃

Soldering temperature

J-STD-020A Specification (See Note 7)

*This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the

operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of

time may affect reliability.

RECOMMENDED DC OPERATING CONDITIONS

(0

℃ to 70℃)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Logic 1 Voltage All Inputs

2.2

Vcc+0.3

V

Logic 0 Voltage All Inputs

-0.3

0.8

V

RECOMMENDED DC OPERATING CONDITIONS

(0

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Active Supply Current

15

50

mA

2,3

TTL Standby Current

(

1

3

mA

2,3

CMOS Standby Current

(

=Vcc-0.2V, CE2=GND +0.2V)

1

3

mA

2,3

Input Leakage Current (any input)

-1

+1

µA

Output Leakage Current (any Output)

-1

+1

µA

Output Logic 1 Voltage

2.4

1

Output Logic 0 Voltage

0.4

1

Write Protection Voltage

4.25

4.37

4.50

V

1