DS1643P-70 Maxim Integrated Products, DS1643P-70 Datasheet - Page 6
![IC RAM TIMEKEEP NV 70NS 34-PCM](/photos/6/58/65856/406-34-pcm_sml.jpg)
DS1643P-70
Manufacturer Part Number
DS1643P-70
Description
IC RAM TIMEKEEP NV 70NS 34-PCM
Manufacturer
Maxim Integrated Products
Type
Clock/Calendar/NVSRAMr
Datasheet
1.DS1643P-100.pdf
(17 pages)
Specifications of DS1643P-70
Memory Size
64K (8K x 8)
Time Format
HH:MM:SS (24 hr)
Date Format
YY-MM-DD-dd
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
34-PowerCap™ Module
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
DS1643P-70
Manufacturer:
DALLAS
Quantity:
20 000
DATA RETENTION MODE
When V
read or write cycles. However, when V
protection occurs) the internal clock registers and RAM are blocked from access. This is accomplished
internally by inhibiting access via the
be driven active low and will remain active until V
level of the internal battery supply, power input is switched from the V
clock activity, RAM, and clock data are maintained from the battery until V
level. The
and address signals must be powered down when V
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 V
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 25C with the internal clock oscillator running in
the absence of V
source disconnected, guaranteeing full energy capacity. When V
V
Ds1643 will be much longer than 10 years since no lithium battery energy is consumed when V
present.
PF
, the lithium energy source is enabled for battery backup operation. Actual life expectancy of the
CC
RST
is within nominal limits (V
signal is an open drain output and requires a pull up. Except for the
CC
power. Each DS1643 is shipped from Dallas Semiconductor with its lithium energy
CC
CE
CC
supply is not present. The capability of this internal power supply
signal. At this time the power-on reset output signal (
> 4.5V) the DS1643 can be accessed as described above with
CC
is below the power-fail point V
6 of 17
CC
CC
returns to nominal levels. When V
is powered down.
CC
is first applied at a level greater than
CC
pin to the internal battery and
CC
PF
is returned to nominal
(point at which write
RST
CC
, all control, data,
DS1643/DS1643P
falls below the
RST
) will
CC
is