FM33256_09 datasheet, PDF - EEWORLD Datasheet

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FM33256_09: Description3V Integrated Processor Companion with Memory; File Size318KB，28 Pages; ManufacturerRamtron International Corporation (Cypress Semiconductor Corporation); Websitehttp://www.cypress.com/

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FM33256_09 Overview

3V Integrated Processor Companion with Memory

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Pre-Production

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 V

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

µA

•

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 V

and Watchdog

•

Programmable Low-V

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, 50µA 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-V

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 V

condition or a watchdog timeout. /RST goes

active when V

drops below a programmable

threshold and remains active for 100 ms (max.) after

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

power or battery-backed using only V

BAK

. If

BAK

is connected to a battery or capacitor, then

events will be counted even in the absence of V

Ramtron International Corporation

1850 Ramtron Drive, Colorado Springs, CO 80921

(800) 545-FRAM, (719) 481-7000

http://www.ramtron.com

Page 1 of 28

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.

Rev. 2.0

Feb. 2009

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