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Cypress Semiconductor Corp FM31L278-G
- Part No.:
- FM31L278-G
- Manufacturer:
- Cypress Semiconductor Corp
- Category:
- Specialized ICs
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Description:
- 256-KBIT INTEGRATED PROCESSOR CO
- Quantity:
Unit Price:$0
Ext Price:$0
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Product Details
FM31L278-G - 256-Kbit F-RAM Processor Companion
Cypress Semiconductor FM31L278-G, now documented by Infineon, combines 256-Kbit nonvolatile F-RAM, a real-time clock and processor-supervision functions in a 14-pin SOIC package. The LCDChip record names 14-SOIC (0.154-inch, 3.90 mm width).
Verify the exact ordering code and the manufacturer's 51-85067 package drawing before board release.
Overview
FM31L278-G integrates 32K × 8 nonvolatile F-RAM with a battery/capacitor-backed clock/calendar, watchdog, low-voltage reset, power-fail monitor, event counters and a lockable 64-bit serial-number area. Memory and companion functions use separate logical I2C device identities. The specified VDD operating range is 2.7–3.6 V over -40°C to +85°C.
Key Advantages
256-Kbit F-RAM provides high-endurance, no-write-delay data storage.
RTC/calendar can continue from a battery or capacitor on VBAK.
Watchdog, low-VDD reset and early power-fail detection support robust control.
Two battery-backed 16-bit counters and a lockable serial number support system records and identification.
Feature Summary
32,768 × 8 bits for the FM31L278 density option.
Two-wire I2C interface supporting up to 1 MHz under data-sheet conditions.
Uses a 32.768 kHz crystal with specified 6 pF or 12.5 pF load options.
14-pin SOIC, manufacturer package diagram 51-85067.
Package & Footprint
The original LCDChip package is 14-SOIC (0.154-inch, 3.90 mm width). The package registry maps it to 14-SOIC and `/upload/package/14-SOIC.jpg`. Infineon's ordering information identifies FM31L278-G as 14-pin SOIC, diagram 51-85067, with a 150-mil package outline. Use the manufacturer's controlled drawing for mechanical dimensions and land pattern.
- Match pin-1 orientation and 51-85067 dimensions.
- Provide VDD decoupling and a stable VSS reference.
- Route the crystal and I2C bus to the recommended electrical limits.
The registered 14-SOIC JPG is absent from the production site. Confirm the footprint using the manufacturer package diagram, not this missing generic image.
Pin Functions
The manufacturer's 14-pin SOIC pin-definition table identifies these signals; use its pinout figure for physical numbering:
Main supply and system ground.
Backup source for RTC and event counters.
Bidirectional I2C data and serial clock; SDA needs an external pull-up.
Device-select address inputs.
32.768 kHz crystal connection for the RTC.
Battery-backed event-counter inputs; do not leave floating.
Active-low reset output and manual-reset input.
Early power-fail input and calibration/power-fail output.
Follow Infineon's specified handling of unused backup, oscillator, counter and power-fail pins.
Key Specifications
| Device function | Integrated F-RAM and processor companion |
|---|---|
| Nonvolatile memory | 256 Kbit, organized 32K × 8 |
| Supply voltage | 2.7–3.6 V |
| Operating temperature | -40°C to +85°C |
| Serial interface | I2C, up to 1 MHz under specified timing |
| Endurance | 10^14 read/write cycles over operating temperature |
| Data retention | 151 years minimum at 65°C; temperature dependent |
| RTC reference | 32.768 kHz crystal |
| Supervisory functions | Low-VDD reset, watchdog and power-fail monitor |
| Event counters | Two 16-bit battery-backed counters |
| Serial-number area | 64-bit programmable, lockable |
| Package | 14-pin SOIC, diagram 51-85067 |
Retention and electrical characteristics are conditional; use the data-sheet test conditions and current revision for design limits.
Replacement Considerations
Any replacement must match the 256-Kbit density, I2C addresses and register map, backup behavior, reset/watchdog operation, supply range, temperature grade and 14-pin footprint. The FM31L276 is a lower-density family member, not an unconditional substitute. Infineon lists FM31L278-G as end of life; verify any proposed successor against a current controlled comparison and the exact board design. No unverified LCDChip alternative link is asserted.
Manufacturer Information
Cypress originally documented FM31L278-G; Infineon now hosts the exact-part product page and FM31L276/FM31L278 data sheet. Infineon's product page currently marks FM31L278-G end of life. Check current manufacturer notices, ordering availability and replacement guidance before procurement or design reuse.
Applications
Record frequent nonvolatile events using high-endurance F-RAM.
Combine watchdog and reset supervision with nonvolatile settings.
Maintain calendar information with a suitable VBAK source.
Count external events during main-supply interruptions when the backup path is correctly designed.
Quality & Authenticity
Verify exact FM31L278-G markings, lot traceability, 14-pin SOIC geometry, and applicable Infineon/Cypress documentation. Because the manufacturer lists the part as end of life, confirm sourcing and qualification requirements separately.
FAQ
How much F-RAM does FM31L278-G provide?
256 Kbit, organized as 32K × 8 bits.
Does the RTC require a backup source?
For timekeeping while main VDD is absent, design a suitable battery or capacitor connection to VBAK.
Can FM31L276-G replace it directly?
No. FM31L276 is the 64-Kbit family option; review memory size and all system dependencies.
Is the package image ready for publication?
No. The site's registered JPG currently returns HTTP 404 and requires correction and visual review.
Engineering Notice
Validate I2C addressing and pull-ups, power-fail sequencing, RTC crystal loading, backup supply, event-counter inputs, reset behavior and SOIC-14 footprint against the current Infineon data sheet. The production package JPG is unavailable; do not publish until the image and mechanical match are verified.
FM31L278-G Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- Cypress Semiconductor Corp
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Processor Companion
- Applications:
- Processor-Based Systems
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
- Grade:
- -
- Qualification:
- -
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