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參數(shù)資料
| 型號(hào)： | FM33256-G |
| 元件分類(lèi)： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| 封裝： | GREEN, MS-012AB, SOIC-14 |
| 文件頁(yè)數(shù)： | 1/28頁(yè) |
| 文件大小： | 320K |
| 代理商： | FM33256-G |
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Pre-Production
This is a product in the pre-production phase of development. Device
Ramtron International Corporation
characterization is complete and Ramtron does not expect to change the
1850 Ramtron Drive, Colorado Springs, CO 80921
specifications. Ramtron will issue a Product Change Notice if any
(800) 545-FRAM, (719) 481-7000
specification changes are made.
http://www.ramtron.com
Rev. 2.0
Feb. 2009
Page 1 of 28
FM33256/FM3316
3V Integrated Processor Companion with Memory
Features
High Integration Device Replaces Multiple Parts
Serial Nonvolatile Memory
Real-time Clock (RTC) with Alarm
Low VDD Detection Drives Reset
Watchdog Window Timer
Early Power-Fail Warning/NMI
16-bit Nonvolatile Event Counter
Serial Number with Write-lock for Security
Ferroelectric Nonvolatile RAM
256Kb and 16Kb versions
Unlimited Read/Write Endurance
45 year Data Retention
NoDelay Writes
Real-time Clock/Calendar
Backup Current under 1
A
Seconds through Centuries in BCD format
Tracks Leap Years through 2099
Uses Standard 32.768 kHz Crystal
Software Calibration
Supports Battery or Capacitor Backup
Processor Companion
Active-low Reset Output for VDD and Watchdog
Programmable Low-VDD Reset Thresholds
Manual Reset Filtered and Debounced
Programmable Watchdog Window Timer
Nonvolatile Event Counter Tracks System
Intrusions or other Events
Comparator for Power-Fail Interrupt or Other Use
64-bit Programmable Serial Number with Lock
Fast SPI Interface
Up to 16 MHz Maximum Bus Frequency
RTC, Supervisor Controlled via SPI Interface
SPI Mode 0 & 3 (CPOL, CPHA=0,0 & 1,1)
Easy to Use Configurations
Operates from 2.7 to 3.6V
Small Footprint “Green” 14-pin SOIC (-G)
Low Operating Current, 50
A Standby Current
-40
°C to +85°C Operation
Underwriters Laboratory (UL) Recognized
Description
The FM33256 and FM3316 are devices that integrate
F-RAM memory with the most commonly needed
functions
for
processor-based
systems.
Major
features include nonvolatile memory, real-time clock,
low-VDD reset, watchdog timer, nonvolatile event
counter, lockable 64-bit serial number area, and
general purpose comparator that can be used for a
power-fail (NMI) interrupt or other purpose. The
devices operate from 2.7 to 3.6V.
Each FM33xx provides nonvolatile RAM available in
memory capacity of 16Kb and 256Kb. Fast write
speed and unlimited endurance allow the memory to
serve as extra RAM or conventional nonvolatile
storage. This memory is truly nonvolatile rather than
battery backed.
The real-time clock (RTC) provides time and date
information in BCD format. It can be permanently
powered from external backup voltage source, either
a battery or a capacitor. The timekeeper uses a
common external 32.768 kHz crystal and provides a
calibration mode that allows software adjustment of
timekeeping accuracy.
The processor companion includes commonly needed
CPU
support
functions.
Supervisory
functions
include a reset output signal controlled by either a
low VDD condition or a watchdog timeout. /RST goes
active when VDD drops below a programmable
threshold and remains active for 100 ms (max.) after
VDD rises above the trip point. A programmable
watchdog timer runs from 60 ms to 1.8 seconds. The
timer may also be programmed for a delayed start,
which functions as a window timer. The watchdog
timer is optional, but if enabled it will assert the reset
signal for 100 ms if not restarted by the host within
the time window. A flag-bit indicates the source of
the reset.
A comparator on PFI compares an external input pin
to the onboard 1.5V reference. This is useful for
generating a power-fail interrupt (NMI) but can be
used for any purpose. The family also includes a
programmable 64-bit serial number that can be
locked making it unalterable. Additionally it offers an
event counter that tracks the number of rising or
falling edges detected on a dedicated input pin. The
counter can be programmed to be non-volatile under
VDD power or battery-backed using only VBAK. If
VBAK is connected to a battery or capacitor, then
events will be counted even in the absence of VDD.
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