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产品详情
Parametric specs for Non-Volatile RAM Controllers
CE Cntrl. | Yes |
Smart Socket w/Int. Batt. | No |
Li Batt. Monitor | Yes |
Pwr. Fail Out | Yes |
RAMs Controlled | 1 |
VSUPPLY (V) | 5 |
Package/Pins | PDIP/8 SOIC (N)/8 SOIC (W)/16 |
Oper. Temp. (°C) | -40 to +85 |
Budgetary Price (See Notes) | 7.18 |
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Technical Docs
数据资料 | 非易失控制器,带有锂电池监测器 | Jul 18, 2012 | |
应用笔记 | Battery Monitoring in NV SRAM Modules | ||
应用笔记 | NV SRAM Frequently Asked Questions |
参量
Parametric specs for Non-Volatile RAM Controllers
CE Cntrl. | Yes |
Smart Socket w/Int. Batt. | No |
Li Batt. Monitor | Yes |
Pwr. Fail Out | Yes |
RAMs Controlled | 1 |
VSUPPLY (V) | 5 |
Package/Pins | PDIP/8 SOIC (N)/8 SOIC (W)/16 |
Oper. Temp. (°C) | -40 to +85 |
Budgetary Price (See Notes) | 7.18 |
主要特征
- 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
- Optional 5% or 10% power-fail detection
- 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
应用/用途
描述
The DS1312 Nonvolatile Controller with Battery Monitor is a CMOS circuit which solves the application problem of converting CMOS RAM into nonvolatile memory. Incoming power is monitored for an out-of-tolerance condition. When such a condition is detected, chip enable is inhibited to accomplish write protection and the battery is switched on to supply the RAM with uninterrupted power. Special circuitry uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery consumption.
In addition to battery-backup support, the DS1312 performs the important function of monitoring the remaining 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 majority of its life, accurate battery monitoring requires loaded-battery voltage measurement. The DS1312 performs such measurement by periodically comparing the voltage of the battery as it supports an internal resistive load with a carefully selected reference voltage. If the battery voltage falls below the reference voltage under such conditions, the battery will soon reach end-of-life. As a result, the Battery Warning pin is activated to signal the need for battery replacement.
In addition to battery-backup support, the DS1312 performs the important function of monitoring the remaining 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 majority of its life, accurate battery monitoring requires loaded-battery voltage measurement. The DS1312 performs such measurement by periodically comparing the voltage of the battery as it supports an internal resistive load with a carefully selected reference voltage. If the battery voltage falls below the reference voltage under such conditions, the battery will soon reach end-of-life. As a result, the Battery Warning pin is activated to signal the need for battery replacement.
Technical Docs
数据资料 | 非易失控制器,带有锂电池监测器 | Jul 18, 2012 | |
应用笔记 | Battery Monitoring in NV SRAM Modules | ||
应用笔记 | NV SRAM Frequently Asked Questions |