Infineon Technologies CY14B256L-SZ45XIT

Overview

CY14B256L-SZ45XIT from Cypress Semiconductor is a 256 Kbit (32K × 8) nonvolatile SRAM with QuantumTrap™ technology, functioning as a drop-in SRAM replacement with integrated nonvolatile storage. It delivers 45 ns access time, operates from a single 3V ±10% supply, supports AutoStore™ on power loss using an external VCAP capacitor, and provides unlimited SRAM read/write cycles with 200,000 STORE endurance. Used in industrial control modules requiring persistent memory retention during unexpected power failure.

For engineers reviewing the CY14B256L-SZ45XIT datasheet, CY14B256L-SZ45XIT pinout, CY14B256L-SZ45XIT application, or CY14B256L-SZ45XIT equivalent, key selection criteria include AutoStore timing behavior, HSB-controlled hardware store latency, VCAP capacitance requirements (0.47 µF), software STORE/RECALL address sequences, and compatibility with STK14D88-based legacy designs.

Technical Context

The CY14B256L-SZ45XIT integrates standard SRAM array (512 × 512) with parallel QuantumTrap nonvolatile cells per bit, enabling simultaneous STORE/RECALL across all 32,768 bytes. Its architecture decouples volatile operation from nonvolatile persistence: SRAM functions at full speed while STORE/RECALL are atomic, blocking concurrent accesses.

Three STORE initiation modes coexist-AutoStore triggered by VCC falling below VSWITCH (~2.7 V), hardware STORE via HSB pin assertion, and software STORE via six-address CE-controlled READ sequence (0x0E38 → 0x0FC0). RECALL occurs automatically on power-up or via software sequence ending at 0x0C63, with tHRECALL = 20 ms typical.

Key Specifications

Pinout & Package

Package: 32-pin SOIC (300 mil width), RoHS-compliant, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14D88-35I and FM24V02-G, CY14B256L-SZ45XIT uniquely balances 45 ns speed, software-addressable STORE/RECALL, and true hands-off AutoStore-making it optimal for industrial systems needing both performance and guaranteed power-loss resilience without host coordination.

Availability

CY14B256L-SZ45XIT is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, telecom remote radio units, and automotive ADAS recorders requiring stable component supply and long-term lifecycle support.

Supply support for CY14B256L-SZ45XIT 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

Cypress Semiconductor (now part of Infineon Technologies) designs high-reliability memory and programmable solutions for industrial, automotive, and communications markets.

The CY14B series targets legacy SRAM replacement with nonvolatile persistence-specifically engineered for systems where battery backup is prohibited, space-constrained, or unreliable over product lifetime.

FAQ

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

The CY14B256L-SZ45XIT requires a minimum 0.47 µF ceramic capacitor on the VCAP pin to ensure successful STORE during VCC dropout. This value is derived from internal charge-pump efficiency and tSTORE timing; using <0.47 µF risks incomplete STORE under worst-case temperature and voltage conditions.

Can software STORE and AutoStore occur simultaneously?

No. The CY14B256L-SZ45XIT disables AutoStore if a software STORE is active, and vice versa. The device uses internal arbitration to prevent conflict-only one STORE operation may execute at a time, with priority given to hardware-triggered STORE if HSB is asserted mid-software sequence.

How does the HSB pin behave during power-up RECALL?

During power-up RECALL, HSB remains HIGH (due to internal weak pull-up) and is not driven. It only goes LOW during active STORE operations-whether initiated by AutoStore, HSB assertion, or software sequence-and returns HIGH upon completion.

Is the CY14B256L-SZ45XIT pin-compatible with standard 32K × 8 SRAMs?

Yes-CY14B256L-SZ45XIT uses identical 32-pin SOIC pinout and timing interface as industry-standard 32K × 8 SRAMs (e.g., IS61LV256AL), with VCAP and HSB added as dedicated pins. Existing PCB layouts require only VCAP capacitor addition and optional HSB routing.