DS1314S-2+T&R Memory Controllers 3V Nonvolatile Controller with Lithium Battery Monitor
DS1314S-2+T&R Memory Controllers 3V Nonvolatile Controller with Lithium Battery Monitor
| Maxim Integrated | |
| Product Category: | Memory Controllers |
| RoHS: | Details |
| Nonvolatile SRAM | |
| Yes | |
| 3.6 V | |
| 3 V | |
| 30 uA | |
| - 40 C | |
| + 85 C | |
| SMD/SMT | |
| SOIC-8 | |
| Reel | |
| Cut Tape | |
| MouseReel | |
| Brand: | Maxim Integrated |
| Description/Function: | Converts CMOS SRAM into nonvolatile memory |
| Height: | 1.35 mm |
| Length: | 4.8 mm |
| Lithium Battery Monitor: | Yes |
| Number of Memory Channels: | 1 |
| Operating Supply Voltage: | 3.3 V |
| Product Type: | Memory Controllers |
| Series: | DS1314S |
| Subcategory: | Memory & Data Storage |
| Type: | Non-Volatile SRAM (NVSRAM) |
| Width: | 3.8 mm |
| Part # Aliases: | DS1314S 90-1314S+T08 |
| Unit Weight: | 0.019048 oz |
DESCRIPTION
DS1314 Nonvolatile Controller with Battery Monitor is a CMOS circuit which solves the applicationproblem
of converting CMOS RAM into nonvolatile memory. Incoming power is monitored for an outof-tolerance
condition. When such a condition is detected, chip enable is inhibited to accomplish writeprotection and the
battery is switched on to supply the RAM with uninterrupted power. Special circuitryuses a low-leakage
CMOS process which affords precise voltage detection at extremely low batteryconsumption.
In addition to battery-backup support, the DS1314 performs the important function of monitoring theremaining
capacity of the lithium battery and providing a warning before the battery reaches end-of-life.Because the
open-circuit voltage of a lithium backup battery remains relatively constant over the majorityof its life,
accurate battery monitoring requires loaded-battery voltage measurement. The DS1314performs such
measurement by periodically comparing the voltage of the battery as it supports an internalresistive load
with a carefully selected reference voltage. If the battery voltage falls below the referencevoltage under such
conditions, the battery will soon reach end-of-life. As a result, the Battery Warningpin is activated to signal the
need for battery replacement.
FEATURES
■Converts CMOS SRAM into nonvolatile
memory
■Unconditionally write-protects SRAM when
Vcc is out of tolerance
■Automatically switches to battery backup
supply when Vcc power failure occurs
Monitors voltage of a lithium cell and
provides advanced warning of impending
battery failure
■Signals low-battery condition on active low
Battery Warning output signal
Automatic Vcc power-fail detection for 3.0V
or 3.3V power supplies
■Space-saving 8-pin DIP and SOIC packages
■Optional 16-pin SOIC and 20-pin TSSOP
versions reset processor when power failure
occurs and hold processor in reset during
system power-up
Industrial temperature range of -40°C to
+85°C
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