FM3264-G Ramtron, FM3264-G Datasheet - Page 3

• Manufacturer Part Number: FM3264-G
• Description: Supervisory Circuits 64K w/Pwr Mon WDT Bat Sw Pwr Fail
• Manufacturer: Ramtron

Specifications of FM3264-G

• Number Of Voltages Monitored: 4
• Monitored Voltage: 2.6 V or 2.9 V or 3.9 V or 4.4 V
• Output Type: Active Low or Bidirectional
• Manual Reset: Resettable
• Watchdog: Watchdog
• Battery Backup Switching: Backup
• Power-up Reset Delay (typ): 200 ms
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Supply Current (typ): 1500 uA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-14
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Pin Descriptions
Rev. 3.1
July 2010
Pin Name
A0, A1
CNT1, CNT2
PFO
/RST
SDA
SCL
PFI
VBAK
VDD
VSS
A1, A0
VBAK
VDD
SDA
SCL
RST
PFI
PFO
2.5V
Output
Supply
Supply
Supply
Type
Input
Input
Input
Input
I/O
I/O
Interface
2-Wire
LockOut
+
-
+
-
Pin Description
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.
Event Counter Inputs: These battery-backed inputs increment counters when an edge is
detected on the corresponding CNT pin. The polarity is programmable. These pins
should not be left floating. Tie to ground if pins are not used.
Power Fail Output: This is the early power-fail output.
Active low reset output with weak pull-up. Also input for manual reset.
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.
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.
Early Power-fail Input: Typically connected to an unregulated power supply to detect
an early power failure. This pin should not be left floating.
Backup supply voltage: A 3V battery or a large value capacitor. If V
backup supply is used, this pin should be tied to V
supply is used, this pin should be left floating and the VBC bit should be set.
Supply Voltage.
Ground
1.2V
Watchdog
LV Detect
Figure 1. Block Diagram
Switched Power
Registers
Function
Special
Nonvolatile
S/N
LockOut
DD
Counters
Battery Backed
. If V
FRAM
Event
Array
DD
>3.6V and no backup
FM3204/16/64/256
DD
<3.6V and no
Page 3 of 21
CNT1
CNT2