FM31274-G Ramtron, FM31274-G Datasheet - Page 20

• Manufacturer Part Number: FM31274-G
• Description: FRAM, MPU SUPPORT, 16K, RTC, SOIC14
• Manufacturer: Ramtron

Specifications of FM31274-G

• Memory Size: 16Kbit
• Nvram Features: RTC
• Supply Voltage Range: 4V To 5.5V
• Memory Case Style: SOIC
• No. Of Pins: 14
• Operating Temperature Range: -40°C To +85°C
• Interface: Serial
• Package / Case: SOIC
• Memory Configuration: 2048 X 8
• Interface Type: I2C, Serial, 2-Wire
• Rohs Compliant: Yes
• 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