| Serial RTCs |
 Like
ST's TIMEKEEPER® NVRAMs, Serial
RTCs keep track of day-date-time, even in the absence of power.
Instead of the standard asynchronous parallel SRAM interface, Serial
RTCs use a serial bus. Our devices are available in two industry
standard serial interfaces: I²C (Inter-Integrated Circuit)
and SPI (Serial Peripheral Interface). |
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| ZEROPOWER® NVRAM |
 STMicroelectronics'
ZEROPOWER
products integrate low power SRAMs with a power-fail control
circuit and a long-life lithium battery. The power-fail circuit
monitors the external power supply voltage. If this falls below
a specific threshold it automatically write-protects the SRAM and
switches the standby power supply to the internal lithium battery.
The advantage is long term data retention with fast READ/WRITE times
and unlimited READ/WRITE cycles of standard SRAMs. |
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| TIMEKEEPER® NVRAM |
 STMicroelectronics'
TIMEKEEPER
products add a quartz crystal, very low power oscillator and
a clock/calendar circuit to provide real-time data. Advanced TIMEKEEPERs
include additional features such as programmable alarms, watchdog
timers, system reset outputs and battery low warning flags. |
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| NVRAM and TIMEKEEPER Supervisors |
 NVRAM
and TIMEKEEPER Supervisors convert standard low-power SRAM devices
into non-volatile memory. They provide control and battery backup
from 1Mbit to 16Mbit external low power SRAM with up to 10 years
of data retention, depending on the Supervisor, battery and SRAM
type selected. |
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| More Information |
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