DS1643P-100+ Maxim Integrated Products, DS1643P-100+ Datasheet - Page 6

• Manufacturer Part Number: DS1643P-100+
• Description: IC RAM TIMEKEEP NV 100NS 34-PCM
• Manufacturer: Maxim Integrated Products
• Type: Clock/Calendar/NVSRAMr

Specifications of DS1643P-100+

• 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: Lead free / RoHS Compliant

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 25C 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