DS1244 データシートの表示（PDF） - Unspecified

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DS1244

256k NV SRAM with Phantom Clock

Unspecified 

DS1244/DS1244P

256k NV SRAM

with Phantom Clock

ZERO BITS

Registers 1,2,3,4,5, and 6 contain one or more bits that always read logic 0. When writing these locations, either a logic 1 or 0 is

acceptable.

BATTERY LONGEVITY

The DS1244 has a lithium power source that is designed to provided 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 DS1244 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 DS1244 is shipped from ARTSCHIP Semiconductor with its

lithium energy source disconnected, guaranteeing full energy capacity. When Vcc is first applied at a level greater than VPF, the

lithium energy source is enabled for battery-backup operation. Actual life expectancy of the DS1244 will be much longer than 10

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

CLOCK ACCURACY (DIP MODULE)

The DS1244 is guaranteed to keep time accuracy to within ±1 minute per month at +25℃. The clock is calibrated at the factory by

ARTSCHIP Semiconductor using special calibration nonvolatile tuning elements and does not require additional calibration. For

this reason, methods of field clock calibration are not available and not necessary.

CLOCK ACCURACY (POWERCAP MODULE)

The DS1244P and DS9034PCX are each individually tested for accuracy. Once mounted together, the module will typically keep

time accuracy to within ±1.53 minutes per month (35 ppm) at +25℃.

ABSOLUT MAXIMUM RATINGS *

Voltage Range on Any Pin Relative to Ground

Storage Temperature Range

Soldering Temperature Range

-0.3V to +6.0V

-40℃ to +85℃

See IPC/JEDEC J-STD-020A (DIP)

(Note 13)

OPERATING RANGE

RANGE

TEMP RANGE

Vcc

Commercial

0℃ to +70℃

3.3V ± 10% or 5V ±10%

Industrial

-40℃ to +85℃

3.3V ±10% or 5V ±10%

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

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

time can affect reliability.

RECOMMENDED DC OPERATING CONDITIONS

PARAMETER

SYMBOL

MIN

Vcc=5V ±10%

2.2

Input Logic 1

VIH

Vcc=3.3V ±10%

2.0

Vcc=5V ±15%

-0.3

Input Logic 0

VIL

Vcc=3.3V ±10%

-0.3

Over the operating range

TYP

MAX

UNITS NOTES

Vcc+0.3V

V

11

Vcc+0.3V

0.8

V

11

0.6

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