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FM3264-G Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers

Part No. FM3264-G
Description  Integrated Processor Companion with Memory
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Maker  ETC1 [List of Unclassifed Manufacturers]
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FM3204/16/64/256
Rev 2.1
Dec. 2004
Page 3 of 20
Figure 1. Block Diagram
Pin Descriptions
Pin Name
Type
Pin Description
A0, A1
Input
Device select inputs are used to address multiple memories on a serial bus. To select
the device the address value on the two pins must match the corresponding bits
contained in the device address. The device select pins are pulled down internally.
CNT1, CNT2
Input
Event Counter Inputs: These battery-backed inputs increment counters when an edge is
detected on the corresponding CNT pin. The polarity is programmable.
PFO
Output
Power Fail Output: This is the early power-fail output.
/RST
I/O
Active low reset output with weak pull-up. Also input for manual reset.
SDA
I/O
Serial Data & Address: This is a bi-directional line for the two-wire interface. It is
open-drain and is intended to be wire-OR’d with other devices on the two-wire bus.
The input buffer incorporates a Schmitt trigger for noise immunity and the output
driver includes slope control for falling edges. A pull-up resistor is required.
SCL
Input
Serial Clock: The serial clock line for the two-wire interface. Data is clocked out of the
part on the falling edge, and in on the rising edge. The SCL input also incorporates a
Schmitt trigger input for noise immunity.
PFI
Input
Early Power-fail Input: Typically connected to an unregulated power supply to detect
an early power failure. This pin should not be left floating.
VBAK
Supply
Backup supply voltage: A 3V battery or a large value capacitor. If VDD<3.6V and no
backup supply is used, this pin should be tied to VDD. If VDD>3.6V and no backup
supply is used, this pin should be left floating and the VBC bit should be set.
VDD
Supply
Supply Voltage.
VSS
Supply
Ground
FRAM
Array
2-Wire
Interface
SCL
SDA
RST
A1, A0
PFO
PFI
VDD
VBAK
2.5V
-
+
Event
Counters
CNT1
CNT2
Special
Function
Registers
S/N
LockOut
LockOut
+
-
1.2V
Watchdog
LV Detect
Switched Power
Battery Backed
Nonvolatile




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