Description
VCCI VCCO VBAT
- +5V Power Supply Input - SRAM Power Supply Output - Backup Battery Input
CEI - Chip Enable Input
CEO
TOL
BW
- Chip Enable Output - VCC Tolerance Select
- Battery Warning Output (Open Drain)
RST
GND NC
- Reset Output (Open Drain) - Ground - No Connection
DESCRIPTION
The DS131
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.
- Optional 5% or 10% power-fail detection.
- Space-saving 8-pin DIP and SOIC packages.
- Optional 16-pin S.
DS1312 Datasheet
