DS1314S-2/T&R/C01 Maxim Integrated, DS1314S-2/T&R/C01 Datasheet - Page 3

• Manufacturer Part Number: DS1314S-2/T&R/C01
• Description: Memory Controllers
• Manufacturer: Maxim Integrated

Specifications of DS1314S-2/T&R/C01

• Part # Aliases: 90-1314S-C01

battery. Should
attached to clear
NOTE: The DS1314 cannot constantly monitor an attached battery because such monitoring would
drastically reduce the life of the battery. As a result, the DS1314 only tests the battery for one second out
of every 24 hours and does not monitor the battery in any way between tests. If a good battery (one that
has not been previously flagged with
immediately sense the removal and may not activate
is then reattached to the DS1314, the battery may not be tested until the next scheduled test.
NOTE: Battery monitoring is only a useful technique when testing can be done regularly over the entire
life of a lithium battery. Because the DS1314 only performs battery monitoring when V
systems which are powered-down for excessively long periods can completely drain their lithium cells
without receiving any advanced warning. To prevent such an occurrence, systems using the DS1314
battery monitoring feature should be powered-up periodically (at least once every few months) in order to
perform battery testing. Furthermore, anytime
data integrity should be checked via checksum or other technique.
POWER MONITORING
DS1314S and DS1314E varieties have an additional reset pin. These varieties detect out-of-tolerance
power supply conditions and warn a processor-based system of impending power failure. When V
below the trip point level defined by the TOL pin (V
nominal (3.0V supply) when TOL is connected to V
for 200 ms nominal (t
power-on transients and to allow t
FRESHNESS SEAL MODE
When the battery is first attached to the DS1314 without V
immediately provide battery-backup power on V
both V
mode allows a battery to be attached during manufacturing but not used until after the system has been
activated for the first time. As a result, no battery energy is drained during storage and shipping.
RST
RST
. Reset occurs at 3.0V nominal (3.3V supply) when the TOL pin is connected to GND or at 2.7V
also serves as a power-on reset during power-up. After V
SW
and V
BAT
BW
BW
will the DS1314 leave Freshness Seal Mode and provide battery-backup power. This
not deactivate for this reason, the new battery can be detached for t
.
RPU
). This reset period is sufficiently long to prevent system operation during
REC
to expire.
BW
) is removed between battery tests, the DS1314 may not
BW
RST
CCO
3 of 12
CCO
is activated on the first battery test after a power-up,
. Only after V
has an open-drain output driver.
BW
CCTP
.
), the V
until the next scheduled battery test. If a battery
CCI
CC
CCI
exceeds V
CCI
power applied, the device does not
comparator activates the reset signal
exceeds V
CCTP
CCTP
,
RST
and later falls below
will be held active
BDBA
CC
and then re-
is nominal,
CCI
falls