FM33256/FM3316 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
Operating
Voltage
Max. Clock
Freq.
Reset Thresholds
Ordering Part Number
Configuration
Size
FM33256
FM3316
256Kb
16Kb
2.7-3.6V
16 MHz
16 MHz
2.6V, 2.75, 2.9, 3.0V
"
FM33256-G
FM3316-G
2.7-3.6V
Other memory configurations may be available. Please contact the factory for more information.
Rev. 1.0
Dec. 2006
Page 3 of 28
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
