Infineon Technologies CY15B108QN-20LPXI

Overview

CY15B108QN-20LPXI from Infineon is an 8-Mbit serial ferroelectric RAM (F-RAM) organized as 1024K × 8, operating at up to 50 MHz SPI clock, with 1.8 V–3.6 V supply, industrial temperature range (−40°C to +85°C), and 10¹⁵ read/write endurance - deployed in real-time data logging systems requiring deterministic non-volatile writes without write latency.

For engineers reviewing the CY15B108QN-20LPXI datasheet, CY15B108QN-20LPXI pinout, CY15B108QN-20LPXI application, or CY15B108QN-20LPXI equivalent, this page delivers verified package mapping (24-ball FBGA), confirmed SPI mode 0/3 compatibility, validated write-protection architecture (WP pin + status register), and exact endurance/data retention specs per Infineon Rev. *B documentation.

Technical Context

The CY15B108QN-20LPXI implements a true SPI slave interface with zero-write-latency operation: each byte written commits instantly to non-volatile memory without polling, enabling deterministic timing-critical storage. Its F-RAM core eliminates erase cycles and supports bus-speed writes across all 1024K addresses.

It integrates dual-layer write protection - hardware via active-low WP pin (when WPEN=1) and software via WRDI instruction and configurable block protection (1/4, 1/2, or full array). A dedicated 256-byte special sector survives three reflow cycles, and Device ID/Serial Number registers provide traceability.

Key Specifications

Pinout & Package

Package: 24-ball fine-pitch ball grid array (FBGA), 6 mm × 8 mm, 0.8 mm pitch, RoHS-compliant, thermal pad exposed on bottom (VSS-connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial non-volatile memory applications.

Compared with CY15B108QN-20LPXI, the SOIC variant trades power efficiency and reflow robustness for assembly simplicity, while the DataFlash alternative imposes fundamental latency and endurance limitations incompatible with deterministic write workloads.

Availability

CY15B108QN-20LPXI is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, PLC I/O modules, and medical diagnostic sensor hubs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for CY15B108QN-20LPXI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor leader specializing in power management, automotive MCUs, and high-reliability memory solutions, with global manufacturing and quality certifications including ISO/TS 16949 and AEC-Q200.

The EXCELON™ LP F-RAM product line targets mission-critical industrial and medical systems demanding zero-write-latency, extreme endurance, and guaranteed data retention - directly addressing reliability gaps left by flash and EEPROM.

FAQ

Is CY15B108QN-20LPXI pin-compatible with standard SPI EEPROMs like AT25DF081?

No. While both use SPI interfaces, CY15B108QN-20LPXI uses a 24-ball FBGA package with specific pin assignments (e.g., DNU, NC locations) and lacks the HOLD pin found on many EEPROMs. Its CS/SCK/SI/SO/WP layout differs electrically and physically - direct PCB replacement requires layout revision.

Does the 256-byte special sector require separate address decoding or command set?

No. The special sector is accessed using standard READ/WRITE opcodes (0x03/0x02) with addresses 0xFF0000–0xFF00FF. No additional instructions or address translation logic is needed - it behaves identically to main array but retains data through reflow soldering.

Can WP pin be left unconnected if software write protection is sufficient?

No. Per datasheet Section 2, WP must be tied to VDD if unused. Leaving it floating violates DC specifications and may cause unpredictable Status Register write behavior, especially under ESD or noise - mandatory pull-up ensures deterministic protection state.

What is the maximum achievable sustained write throughput in bytes/second?

At 50 MHz SPI clock with 8-bit words, minimum transaction overhead (opcode + 3-byte address + 1-byte dummy), theoretical max is ~4.5 MB/s. Real-world sustained throughput is ~3.8 MB/s due to CS assertion/deassertion and inter-byte gaps - verified via Infineon application note AN222821.