DS1248Y-70+ Maxim Integrated Products, DS1248Y-70+ Datasheet - Page 8
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DS1248Y-70+
Manufacturer Part Number
DS1248Y-70+
Description
IC NVSRAM 1MBIT 70NS 32DIP
Manufacturer
Maxim Integrated Products
Datasheet
1.DS1248W-120.pdf
(18 pages)
Specifications of DS1248Y-70+
Format - Memory
RAM
Memory Type
NVSRAM (Non-Volatile SRAM)
Memory Size
1M (128K x 8)
Speed
70ns
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Package / Case
32-DIP Module (600 mil), 32-EDIP
Function
Clock/Calendar/NV Timekeeping RAM/Battery Backup
Time Format
HH:MM:SS:hh
Date Format
DW:DM:M:Y
Rtc Memory Size
131072 Byte
Supply Voltage (max)
5.5 V
Supply Voltage (min)
4.5 V
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
Through Hole
Rtc Bus Interface
Phantom Clock or Parallel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
DS1248/DS1248P 1024k NV SRAM with Phantom Clock
ZERO BITS
Registers 1, 2, 3, 4, 5, and 6 contain one or more bits, which will always read logic 0. When writing these
locations, either a logic 1 or 0 is acceptable.
BATTERY LONGEVITY
The DS1248 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 DS1248 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 DS1248 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
DS1248 will be much longer than 10 years since no lithium battery energy is consumed when V
is
CC
present.
See “Conditions of Acceptability” at
www.maxim-ic.com/TechSupport/QA/ntrl.htm
CLOCK ACCURACY (DIP MODULE)
The DS1248 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
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 DS1248P 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 (35ppm) at +25C.
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