Pre-Production
FM33256/FM3316
3V Integrated Processor Companion with Memory
Features
Processor Companion
High Integration Device Replaces Multiple Parts
•
•
•
•
•
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
•
•
•
•
•
•
•
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
•
•
Comparator for Power-Fail Interrupt or Other Use
64-bit Programmable Serial Number with Lock
Ferroelectric Nonvolatile RAM
Fast SPI Interface
•
•
•
•
256Kb and 16Kb versions
Unlimited Read/Write Endurance
45 year Data Retention
NoDelay™ Writes
•
•
•
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
Real-time Clock/Calendar
•
•
•
•
•
•
Backup Current under 1 µA
Small Footprint “Green” 14-pin SOIC (-G)
Low Operating Current, 50µA Standby Current
-40°C to +85°C Operation
Seconds through Centuries in BCD format
Tracks Leap Years through 2099
Uses Standard 32.768 kHz Crystal
Software Calibration
Underwriters Laboratory (UL) Recognized
Supports Battery or Capacitor Backup
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.
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.
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
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.
events will be counted even in the absence of VDD
.
This is a product in the pre-production phase of development. Device
characterization is complete and Ramtron does not expect to change the
specifications. Ramtron will issue a Product Change Notice if any
specification changes are made.
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
http://www.ramtron.com
Rev. 2.0
Feb. 2009
Page 1 of 28
5秒后页面跳转
SK海力士量产12层HBM3E，容量高达36GB
意法半导体传感器驱动Sphere，开启沉浸式电影新时代
摩尔斯微电子在美国约书亚树国家公园测试 Wi-Fi HaLow
贸泽上架Tallysman TW5386智能GNSS天线
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
