FM3135 Datasheet, PDF (1/21 Pages) Ramtron International Corporation – Integrated RTC/Alarm/F-RAM & Embedded Crystal

Preliminary
FM3135
Integrated RTC/Alarm/F-RAM & Embedded Crystal
Features
High Integration Device Replaces Multiple Parts
• Serial Nonvolatile Memory
• Real-time Clock (RTC) with Alarm
• Clock Output (Programmable frequency)
64Kb Ferroelectric Nonvolatile RAM
• Internally Organized as 8Kx8
• Unlimited Read/Write Endurance
• 45 year Data Retention
• NoDelay™ Writes
Fast Two-wire Serial Interface
• Up to 1 MHz Maximum Bus Frequency
• Supports Legacy Timing for 100 kHz & 400 kHz
• RTC & F-RAM Controlled via 2-wire Interface
Real-time Clock/Calendar
• Embedded 32.768 kHz Crystal
• Backup Current under 1 µA
• Seconds through Centuries in BCD format
• Tracks Leap Years through 2099
• Software Calibration
• Supports Battery or Capacitor Backup
Easy to Use Configurations
• Operates from 2.7 to 3.6V
• 20-pin “Green”/RoHS SOIC (-G)
• Low Operating Current
• Industrial Temperature -40°C to +85°C
• Underwriters Laboratory (UL) Recognized
Description
The FM3135 integrates a real-time clock (RTC) and
F-RAM nonvolatile memory. The 32.768kHz crystal
is embedded inside the package. The device operates
from 2.7 to 3.6V.
The FM3135 provides nonvolatile F-RAM which
features fast write speed and unlimited endurance.
This allows the memory to serve as extra RAM for
the system microcontroller 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 crystal
integral to the package and provides a calibration
mode that allows software adjustment of timekeeping
accuracy.
Pin Configuration
NC
1
20
NC
2
19
ACS
3
18
VDD
4
17
NC
5
16
NC
6
15
NC
7
14
NC
8
13
NC
9
12
NC
10
11
NC
VSS
SCL
SDA
VBAK
VSS
NC
NC
NC
NC
Pin Name
ACS
SDA
SCL
VBAK
VDD
VSS
Function
Alarm/Calibration/SqWave
Serial Data
Serial Clock
Battery-Backup Supply
Supply Voltage
Ground
Ordering Information
FM3135-G
“Green”/RoHS 20-pin SOIC
FM3135-GTR “Green”/RoHS 20-pin SOIC,
Tape & Reel
This is a product that has fixed target specifications but are subject
to change pending characterization results.
Rev. 1.2
Feb. 2009
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, [phone]
http://www.ramtron.com
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