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 F-RAM

High Endurance 100 Trillion (1014) Read/Writes

38 year Data Retention (+75°C)

NoDelay™ Writes

Real-time Clock/Calendar

Backup Current at 2V, 1.15 µA (max.) at +25C

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 Configuration

Operates from 2.7 to 3.6V

Small Footprint “Green” 14-pin SOIC (-G)

Low Operating Current

-40°C to +85°C Operation

Underwriters Laboratory (UL) Recognized

Description

The FM33256B device integrates 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 device operate from 2.7 to 3.6V. The FM33256B provides 256Kb memory capacity of nonvolatile F-RAM. 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.

Stock Offer (Hot Sell)

           King--- Originator of ANTERWELL, engaged in the IC electronics industry in 1998 and establish ANTERWELL in 2004. The company is located in Shenzhen Huaqiang North, the largest electronic center in Asia. Our main business is the technical development and electronic products import and export business. Currently, we have branches in Hong Kong and Malaysia.

           Up to now. ANTERWELL have more than 1,000,000 types of electronic components in stock. ANTERWELL has become one of the top choices for purchasing IC chips both domestically and internationally. King is a senior IC chip expert, sales engineer, and mentor, leading an elite team with customer first, quality first, honesty, trustworthiness, and mutual benefit. We look forward to cooperate with you to create a better future!

            ANTERWELL’s main products include semiconductors, resistors, capacitors, diodes, inductors, connectors, transistors, sensors, etc. Involving the major well-known brands such like: TI, XILINX, FAIRCHILD, STM, MICRON, MICROCHIP, TDK, SAMSUNG, ON, NXP,IR,ADI, ATMEL,VISHAY,LINEAR etc.

            ANTERWELL adheres to the development concept and purpose of "direct stock offer, excellent quality, favorable price, and sincere service", which is deeply recognized by domestic and foreign customers. Based on the long-term development goal, ANTERWELL provides customers with standardized, professional, and diversified high-quality services through a strong market service network. ANTEWRELL has multiple skilled and capable executives with a professional QC team and excellent sales team to win the high support and trust of the vast customer base! We provide the best quality, price and service.

           ANTERWELL will be your best Partner.