DS1251 Ver la hoja de datos (PDF) - Unspecified

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DS1251

4096K NV SRAM with Phantom Clock

Unspecified 

DS1251/DS1251P

4096K NV SRAM with Phantom Clock

BATTERY LONGEVITY

The DS1251 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 DS1251 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 DS1251 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 DS1251 will be much longer than 10

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

CLOCK ACCURACY (DIP MODULE)

The DS1251 is guaranteed to keep time accuaracy to within ±1 minute per month at +25℃. The clock is calibrated at the factory

by ARTSCHIP Semiconductor using special calibration nonvolatile tuning elements. The DS1251 does not require additional

calibration and temperature deviations will have a negligible effect in most applications. For this reason, methods of field clock

calibration are not available and not necessary.

CLOCK ACCURACY (POWERCAP MODULE)

The DS1251P and DS9034PCX are each individually tested for accuracy. Once mounted together, the module is guaranteed to

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

ABSOLUTE MAXIMUM RATINGS *

Voltage Range on Any Pin Relative to Ground

Soldering Temperature Range

-0.3V to +6.0V

+260℃ for 10 seconds (DIP) (Note 13)

See IPC/JEDEC Standard J-STD-020A for

Surface Mount Devices

*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.

OPERATING RANGE

RANGE

Commercial

Industrial

TEMP. RANGE (℃)

0 to +70

-40 to +85

Vcc (V)

3.3 ± 10% or 5±10%

3.3± 10% or 5±10%

RECOMMENDED DC OPERATING CONDITIONS

PARAMETER

Logic 1 Voltage All Inputs

Vcc=5V±10%

Vcc=3.3V ±10%

Logic 0 Voltage All Inputs

Vcc =5 V ± 10%

Vcc =3.3V ± 10%

SYMBOL

VIH

VIL

Over the operating range

MIN

TYP

MAX

UNITS

NOTES

2.2

Vcc+03V

V

11

2.0

Vcc +0.3V V

11

-0.3

0.8

V

11

-0.3

0.6

V

11

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