Infineon Technologies CY14B256LA-SP45XIT

Overview

CY14B256LA-SP45XIT from Infineon Technologies (formerly Cypress) is a 256-Kbit (32 K × 8) nonvolatile static RAM with QuantumTrap technology, delivering 45 ns access time, single 3.0 V ±10% operation, and industrial temperature range (–40°C to +85°C). It integrates SRAM and nonvolatile storage in each cell, enabling automatic STORE on power-down via VCAP capacitor and software- or hardware-triggered RECALL. Used in industrial PLCs for real-time data logging during unexpected power loss.

For engineers reviewing the CY14B256LA-SP45XIT datasheet, CY14B256LA-SP45XIT pinout, CY14B256LA-SP45XIT application, or CY14B256LA-SP45XIT equivalent, key selection criteria include AutoStore timing (tHRECALL = 20 ms max), HSB busy signaling, VCAP capacitance requirement (0.1 µF), and compatibility with 32-pin SOIC footprint in space-constrained control modules.

Technical Context

The device implements a dual-cell architecture: standard fast SRAM (32 K × 8) paired with parallel QuantumTrap nonvolatile elements per bit. STORE and RECALL operate atomically across all 32,768 bytes, with SRAM access inhibited during both operations.

AutoStore is triggered by VCC drop below VSWITCH (2.2 V min), using charge stored on external VCAP (0.1 µF) to complete STORE within 20 ms. Hardware STORE is initiated by driving HSB low, while software STORE uses a six-address read sequence (0x0E38 → 0x31C7 → 0x03E0 → ...), requiring strict sequencing without intervening accesses.

Key Specifications

Pinout & Package

Package: 32-pin Small Outline Integrated Circuit (SOIC), 300 mil width, RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar nvSRAM applications.

Compared with STK14C88-3AJ5F and FM24V01A-G, CY14B256LA-SP45XIT uniquely balances 45 ns speed, 1M STORE endurance, hands-off AutoStore, and 20-year retention-making it optimal for industrial control nodes requiring autonomous, high-frequency state capture without MCU involvement.

Availability

CY14B256LA-SP45XIT is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, motor drive fault recorders, and railway signaling controllers requiring stable component supply across extended product lifecycles.

Supply support for CY14B256LA-SP45XIT 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 global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive ICs, and industrial control solutions.

CY14B256LA belongs to Infineon's nvSRAM product line, engineered specifically for mission-critical industrial systems where deterministic, battery-free nonvolatility and SRAM-speed performance are mandatory.

FAQ

What is the minimum VCAP capacitance required for reliable AutoStore operation?

The CY14B256LA-SP45XIT requires a minimum 0.1 µF ceramic capacitor on the VCAP pin to ensure successful STORE completion during VCC dropout. This value is specified in the DC Electrical Characteristics table (Rev. *L, page 8) and validated across –40°C to +85°C. Using a smaller capacitor risks partial STORE failure and data corruption.

Can the HSB pin be left unconnected if hardware STORE is not used?

Yes, the HSB pin may be left unconnected if hardware STORE initiation and busy monitoring are not required. The internal 100 kΩ weak pull-up ensures HSB remains HIGH during normal operation. However, leaving it floating is not recommended-either tie to VCC via 10 kΩ or leave open with no external load to avoid noise-induced STORE triggers.

How does the software STORE sequence prevent accidental activation?

The software STORE requires six exact-address read cycles (0x0E38, 0x31C7, 0x03E0, 0x0E39, 0x31C6, 0x03E1) with no intervening accesses. Any deviation-such as a write, CE/OE toggle, or incorrect address-aborts the sequence. This design prevents spurious STOREs from noise or software glitches, ensuring intentional, auditable nonvolatile writes.

Is the CY14B256LA-SP45XIT compatible with 3.3 V systems?

No-the device operates strictly at 3.0 V ±10% (2.7 V to 3.6 V). While 3.3 V nominal supplies fall within this range, system designers must verify that worst-case ripple, load transient droop, and cold-start behavior stay above 2.7 V. Use of a dedicated 3.0 V LDO regulator is recommended over direct 3.3 V rail connection.