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FM3808 数据表(PDF) 1 Page - Ramtron International Corporation |
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FM3808 数据表(HTML) 1 Page - Ramtron International Corporation |
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1 / 27 page  N O T R EC O M M EN D ED FO R N EW D ES IG N S La st Ti m e B uy : S ept . 200 6 N o Di re ct Re pl ac em en t Al te rn at e So lu tio n: FM 18 08 +F M 40 05 Preliminary This is a product in sampling or pre-production phase of develop- Ramtron International Corporation ment. Characteristic data and other specifications are subject to 1850 Ramtron Drive, Colorado Springs, CO 80921 change without notice. (800) 545-FRAM, (719) 481-7000 Rev. 1.3 (EOL) www.ramtron.com Feb. 2006 Page 1 of 27 FM3808 256Kb Bytewide FRAM w/ Real-Time Clock Features 256K bit Ferroelectric Nonvolatile RAM • Organized as 32,752 x 8 bits • High Endurance 100 Billion (10 11) 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 • Battery Backed Power • 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 I BAK Clock Backup Current Description The FM3808 combines a 256Kb FRAM array with a real-time clock and a system supervisor function. An external 32.768 kHz crystal drives the timekeeping function. It maintains time and date settings in the absence of system power through the use of a backup battery power source. Data in the memory array does not depend on the backup source, it remains nonvolatile in FRAM. In addition to timekeeping, the FM3808 includes a system supervisor to manage low VDD power conditions and a watchdog timer function. A programmable interrupt output pin allows the user to select the supervisor functions and the polarity of the signal. Both the FRAM array and the timekeeping function are accessed through the memory interface. The upper 16-address locations of the memory space are allocated to the timekeeping registers rather than to memory. The FRAM array provides data retention for 10 years in the absence of system power, and is not dependent on the backup power source for the clock. This eliminates system concerns over data loss in a traditional battery-backed RAM solution. In addition, clock and supervisor control settings are implemented in FRAM rather than battery-backed RAM, making them more dependable. The FM3808 offers guaranteed operation over an industrial temperature range of -40°C to +85°C. Pin Configuration Ordering Information FM3808-70-T 70 ns access, 32-pin TSOP FM3808DK DIP module development kit Documentation for the DIP module development kit is available separately. A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS DQ3 DQ4 DQ5 DQ6 DQ7 CE A10 OE A11 A9 A8 A13 WE VBAK X1 X2 INT VDD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 |
类似零件编号 - FM3808_06 |
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类似说明 - FM3808_06 |
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