DS1646-120 Maxim Integrated Products, DS1646-120 Datasheet - Page 6
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DS1646-120
Manufacturer Part Number
DS1646-120
Description
Real Time Clock
Manufacturer
Maxim Integrated Products
Datasheet
1.DS1646-120.pdf
(12 pages)
Specifications of DS1646-120
Function
Clock, Calendar, NV Timekeeping RAM
Rtc Memory Size
131072 B
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
Parallel
Package / Case
eDIP
Time Format
HH:MM:SS
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DS1646-120
Manufacturer:
DALLAS
Quantity:
22
Part Number:
DS1646-120
Manufacturer:
DALLAS
Quantity:
20 000
Company:
Part Number:
DS1646-120+
Manufacturer:
Maxim
Quantity:
601
WRITING DATA TO RAM OR CLOCK
The DS1646 is in the write mode whenever
referenced to the latter occurring high to low transition of
throughout the cycle.
another read or write cycle. Data in must be valid t
afterward. In a typical application, the
active provided that care is taken with the data bus to avoid bus contention. If
transitioning low the data bus can become active with read data defined by the address inputs. A low
transition on
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
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.
CC
is within nominal limits (V
WE
will then disable the outputs t
CE
or
WE
must return inactive for a minimum of t
CC
CE
OE
> 4.5 volts) the DS1646 can be accessed as described above with
CC
signal. At this time the power-fail output signal (
signal will be high during a write cycle. However,
WE
is below the power-fail point V
WEZ
CC
6 of 12
and
after
returns to nominal levels. When V
DS
CE
prior to the end of write and remain valid for t
WE
are in their active state. The start of a write is
WE
goes active.
and
CE
. The addresses must be held valid
CC
pin to the internal battery and
WR
CC
PF
prior to the initiation of
OE
is returned to nominal
(point at which write
is low prior to
CC
DS1646/DS1646P
falls below the
PFO
OE
) will be
can be
WE
DH