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參數(shù)資料
| 型號： | FM3808-70-T |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | DRAM |
| 英文描述： | 4Kb FRAM Serial 3V Memory |
| 中文描述： | 4Kb的鐵電串行3V的記憶 |
| 文件頁數(shù)： | 1/28頁 |
| 文件大小： | 191K |
| 代理商： | FM3808-70-T |
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Preliminary
FM3808
256Kb Bytewide FRAM w/ Real-Time Clock
Features
This is a product in sampling or pre-production phase of develop-
ment. Characteristic data and other specifications are subject to
change without notice.
Rev 1.1
May 2003
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000, FAX (719) 481-7058
www.ramtron.com
Page 1 of 28
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 V
DD
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
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 user’s choice of
backup power source – either a capacitor or a battery.
In either case 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 V
DD
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.
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 I
DD
Active Current
1
μ
A I
BAK
Clock Backup Current
Pin Configuration
Ordering Information
70 ns access, 32-pin TSOP
DIP module development kit
FM3808-70-T
FM3808DK
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
INT
VDD
X1
X2
1
2
3
4
5
6
7
8
9
10
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12
13
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FM3808DK | 4Kb FRAM Serial 3V Memory |
| FMA10A | General Purpose(Dual Digital Transistor)(通用(雙數(shù)字晶體管)) |
| FMA11A | Emitter Common (Dual Digital Transistors)(公共發(fā)射級(雙數(shù)字晶體管)) |
| FMA1 | General purpose (dual digital transistors) |
| FMA1A | General purpose (dual digital transistors) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FM3808DK | 制造商:RAMTRON 制造商全稱:RAMTRON 功能描述:256Kb Bytewide FRAM w/ Real-Time Clock |
| FM3808-S | 制造商:Ramtron International Corporation 功能描述:FRAM RTC 256K SMD 3808 TSOP32 |
| FM3808-SG | 制造商:Ramtron International Corporation 功能描述:FRAM RTC 256K SMD 3808 TSOP32 |
| FM380-A | 制造商:FORMOSA 制造商全稱:Formosa MS 功能描述:Silicon epitaxial planer type |
| FM380-AL | 制造商:FORMOSA 制造商全稱:Formosa MS 功能描述:Chip Schottky Barrier Diodes - Silicon epitaxial planer type |
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