FM31L278-G Ramtron, FM31L278-G Datasheet - Page 20

• Manufacturer Part Number: FM31L278-G
• Description: FRAM, MPU SUPPORT, 256K, RTC, SOIC14
• Manufacturer: Ramtron

Specifications of FM31L278-G

• Memory Size: 256Kbit
• Nvram Features: RTC
• Supply Voltage Range: 2.7V To 3.6V
• Memory Case Style: SOIC
• No. Of Pins: 14
• Operating Temperature Range: -40°C To +85°C
• Package / Case: SOIC
• Mounting Style: SMD/SMT
• Memory Configuration: 32768 X 8
• Interface Type: I2C, Serial, 2-Wire
• Rohs Compliant: Yes
• Number Of Voltages Monitored: 1
• Monitored Voltage: 2.6 V or 2.9 V
• Output Type: Active Low, Open Drain
• Manual Reset: Resettable
• Watchdog: Watchdog
• Battery Backup Switching: Yes
• Power-up Reset Delay (typ): 200 ms
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Supply Current (typ): 1500 uA
• Power Fail Detection: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Addressing F-RAM Array in the FM31L27x Family
The FM31L27x family includes 256Kb, 64Kb, 16Kb, and 4Kb memory densities. The following 2-byte address field
is shown for each density.
Table 4. Two-Byte Memory Address
Rev. 2.0
Jan. 2011
Part #
By FM31L27x
By Master
FM31L278
FM31L276
FM31L274
FM31L272
Although not required, it is recommended that A5-A7 in the Register Address byte are zeros in order to
By FM31L27x
By Master
Start
S
Slave Address 0
Start
x
x
x
x
S
A14
x
x
x
Slave Address
A
A13
x
x
x
Figure 18. Selective (Random) Memory Read
preserve compatibility with future devices.
1
Address MSB
st
Address
Address Byte
A12
A12
x
x
Figure 19. Byte Register Write
A11
A11
x
x
0
A
A
A10
A10
A10
x
Address LSB
0 0 0
Acknowledge
Address & Data
A9
A9
A9
x
FM31L278/L276/L274/L272 - 3V I2C Companion
A8
A8
A8
A8
Address
A
Start
S
A7
A7
A7
A7
Slave Address 1
Acknowledge
Address
A6
A6
A6
A6
A
A5
A5
A5
A5
2
nd
A
Address Byte
Data Byte
A4
A4
A4
A4
Data Byte
Data
A3
A3
A3
A3
Acknowledge
A2
A2
A2
A2
No
1 P
A1
A1
A1
A1
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A
Stop
Stop
A0
A0
A0
A0
P