FM33256B SPI Companion w/ FRAM
CS
SCK
SI
SPI
Interface
FRAM
Array
SO
LockOut
Special
Function
Registers
Manual Reset
Watchdog
RST
RTC Registers
X1
LV Detect
S/N
RTC
PFI
RTC Cal.
+
X2
PFO
1.5V
-
Event
Alarm
Counter
CNT
VSW
-
+
Alarm
ACS
512Hz/SqW
VDD
Switched Power
VBAK
Battery Backed
Nonvolatile
NV/BB User Programmable
Figure 1. Block Diagram
Ordering Information
Base
Memory
Size
Operating
Voltage
Max. Clock
Freq.
Reset Thresholds
Ordering Part Number
Configuration
FM33256B
FM33256B
256Kb
256Kb
2.7-3.6V
16 MHz
16 MHz
2.6V, 2.75, 2.9, 3.0V
2.6V, 2.75, 2.9, 3.0V
FM33256B-G
2.7-3.6V
FM33256B-GTR (tape&reel)
This product conforms to specifications per the terms of the Ramtron
standard warranty. The product has completed Ramtron’s internal
qualification testing and has reached production status.
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
www.ramtron.com
Rev. 3.0
Aug. 2012
Page 3 of 28
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
