DS1251WP-120 Maxim Integrated Products, DS1251WP-120 Datasheet - Page 7
![IC NVSRAM 4MBIT 120NS 34PCM](/photos/6/58/65856/406-34-pcm_sml.jpg)
DS1251WP-120
Manufacturer Part Number
DS1251WP-120
Description
IC NVSRAM 4MBIT 120NS 34PCM
Manufacturer
Maxim Integrated Products
Datasheet
1.DS1251Y-70.pdf
(21 pages)
Specifications of DS1251WP-120
Format - Memory
RAM
Memory Type
NVSRAM (Non-Volatile SRAM)
Memory Size
4M (512K x 8)
Speed
120ns
Interface
Parallel
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
0°C ~ 70°C
Package / Case
34-PowerCap™ Module
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
DS1251/DS1251P
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 V
supply is not present. The capability of this internal power supply
CC
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 +25C with the internal clock oscillator running
in the absence of V
power. Each DS1251 is shipped from Dallas Semiconductor with its lithium energy
CC
source disconnected, guaranteeing full energy capacity. When V
is first applied at a level greater than
CC
V
, the lithium energy source is enabled for battery-backup operation. Actual life expectancy of the
PF
DS1251 will be much longer than 10 years since no lithium battery energy is consumed when V
is
CC
present.
CLOCK ACCURACY (DIP MODULE)
The DS1251 is guaranteed to keep time accuracy to within 1 minute per month at +25C. The clock is
calibrated at the factory by Dallas 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 +25C.
7 of 21