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FM3135 Datasheet(PDF) 1 Page - Ramtron International Corporation

Part # FM3135
Description  Integrated RTC/Alarm/F-RAM & Embedded Crystal
Download  21 Pages
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Manufacturer  RAMTRON [Ramtron International Corporation]
Direct Link  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM3135 Datasheet(HTML) 1 Page - Ramtron International Corporation

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Preliminary
This is a product that has fixed target specifications but are subject
Ramtron International Corporation
to change pending characterization results.
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
http://www.ramtron.com
Rev. 1.2
Feb. 2009
Page 1 of 21
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
Pin Name
Function
ACS
Alarm/Calibration/SqWave
SDA
Serial Data
SCL
Serial Clock
VBAK
Battery-Backup Supply
VDD
Supply Voltage
VSS
Ground
Ordering Information
FM3135-G
“Green”/RoHS 20-pin SOIC
FM3135-GTR
“Green”/RoHS 20-pin SOIC,
Tape & Reel
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
NC
NC
NC
ACS
VDD
NC
NC
NC
NC
NC
VSS
SCL
SDA
VBAK
VSS
NC
NC
20
19
18
17
16
15
14
13
12
11


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