Ramtron FM3808
The FM3808 combines a 256Kb FRAM array with a real-time clock and a system supervisor function. It maintains time and date settings in the absence of system power through the user’s choice of backup power source – either a capacitor or a battery. In addition to timekeeping, the FM3808 includes a system supervisor to manage low VDD power conditions and a watchdog timer function.| Part No. | FM3808 |
|---|---|
| Datasheet | FM3808 Download |
| Manufacturer |  Ramtron |
| Description | 256Kb Bytewide FRAM |
| Buy | Stock & Price |
FEATURES
256K bit Ferroelectric Nonvolatile RAM● Organized as 32,752 x 8 bits
● High Endurance 100 Billion (1011) Read/Writes
● 10 year Data Retention
● NoDelay™ Writes
● 70 ns Access Time/ 130 ns Cycle Time
● Built-in Low VDD Protection Real-Time Clock/Calendar Function
● Clock Registers in Top 16 bytes of Address Space
● Backup Power from External Capacitor or Battery
● Tracks Seconds through Centuries in BCD Format
● Tracks Leap Years through 2099
● Runs from a 32.768 kHz Timekeeping Crystal System Supervisor Function
● Programmable Clock/Calendar Alarm
● Programmable Watchdog Timer
● Power Supply Monitor
● Interrupt Output - Programmable active high/low
● Control Settings Inherently Nonvolatile
● Generates either Processor Reset or Interrupt Low Power Operation
● 5V Operation for Memory and Clock Interface
● Backup Voltage as low as 2.5V
● 25 mA IDD Active Current
● 1 µA IBAK Clock Backup Current
DESCRIPTION
An external 32.768 kHz crystal drives the timekeeping function. In either case data in the memory array does not depend on the backup source, it remains nonvolatile in FRAM.
