Infineon Technologies FM31276-GTR

FM31276-GTR integrates 8K × 8 ferroelectric RAM with a battery- or capacitor-backed real-time clock, low-voltage reset, watchdog timer, power-fail comparator, two event counters and a lockable 64-bit serial-number area. Memory and companion registers appear as two logical devices on the I2C bus. F-RAM writes complete without the page-program delay associated with conventional serial EEPROM.

The manufacturer's ordering table lists FM31276-GTR as a 14-pin SOIC in industrial temperature grade, package diagram 51-85067; TR denotes tape and reel. The LCDChip database and package registry identify the normalized package as 14-SOIC (0.154", 3.90 mm width). Verify lead pitch, overall dimensions and pin-one location against the current manufacturer drawing before PCB release.

Layout checks

• Match the 14-pin SOIC pin-one marker and manufacturer outline 51-85067.
• Place a main-supply bypass capacitor close to VDD and VSS.
• Keep the 32.768 kHz crystal loop short and isolated from switching traces.
• Provide suitable pull-ups on the open-drain I2C and reset connections.

The registered 14-SOIC JPG is missing locally and must be supplied and checked before publication.

These signal functions follow the manufacturer's 14-pin SOIC pin-definition table; confirm exact pin numbers against its pinout drawing when laying out the board.

SDA requires an external pull-up. PFI must be tied to ground if unused; other unused-pin handling differs by function.

Retention, endurance, current and timing must be interpreted with the detailed data-sheet operating and test conditions. Absolute-maximum ratings are stress limits, not operating targets.

The manufacturer lists FM31276-G as the same 64-Kbit, 14-pin SOIC family option without the TR tape-and-reel suffix; confirm packaging and order-code availability before substitution. FM31278 family members provide a different 256-Kbit density and need firmware address-range review. For any replacement, compare I2C address behavior, backup power, RTC accuracy, reset/watchdog timing, event-counter behavior, footprint, temperature grade and qualification. No unverified LCDChip internal link is provided.

The FM31276 family originated with Cypress Semiconductor and is documented in the Infineon-hosted Rev. *F data sheet. That controlled document lists FM31276-GTR exactly in its ordering table. Infineon's current part page identifies FM31276-GTR as end of life; check current lifecycle and replacement guidance separately before a new design commitment.

Check the full FM31276-GTR order code, 14-pin SOIC outline, pin-one mark, reel labeling and lot traceability against current manufacturer records. This description does not verify the provenance or condition of an individual device.

Use the current manufacturer data sheet for exact pin numbers, backup-power configuration, I2C addressing, reset/watchdog behavior and electrical limits. The registered package JPG is missing locally, so visual package verification remains incomplete. The manufacturer's current part listing marks this order code end of life.