Infineon Technologies CY14B101L-SP45XI

Overview

CY14B101L-SP45XI from Cypress Semiconductor is a 1 Mbit (128K × 8) nonvolatile SRAM with QuantumTrap technology, delivering 45 ns access time, single 3V (+20%, –10%) operation, and automatic STORE on power loss using an external VCAP capacitor. It functions as a drop-in SRAM replacement in systems requiring persistent data retention without battery backup-used in industrial PLCs, medical data loggers, and telecom control cards where write-cycle integrity during brownout is critical.

For engineers reviewing the CY14B101L-SP45XI datasheet, CY14B101L-SP45XI pinout, CY14B101L-SP45XI application, or CY14B101L-SP45XI equivalent, key selection considerations include AutoStore timing dependency on VCAP capacitance, HSB-driven hardware store arbitration, software STORE/RECALL address sequence compliance, and compatibility with STK14CA8-based legacy designs.

Technical Context

The CY14B101L integrates parallel SRAM and QuantumTrap nonvolatile cells per bit, enabling simultaneous 131,072-byte STORE/RECALL operations. Its architecture decouples volatile read/write cycles (unlimited) from nonvolatile endurance (200,000 STORE cycles), with RECALL restoring full memory contents in ≤100 ms after power-up.

STORE is triggered by three independent mechanisms: AutoStore (VCC < VSWITCH), hardware (HSB pin assertion), or software (6-address READ sequence). RECALL occurs automatically at power-up or via identical 6-address sequence ending in 0x4C63. Both operations inhibit SRAM access until completion.

Key Specifications

Pinout & Package

Package: 32-pin Small Outline Integrated Circuit (SOIC), 300 mil body width, 1.27 mm lead pitch, RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14CA8-35I-M1F, CY14B101L-SP45XI adds HSB visibility and software control at the cost of slightly longer STORE latency; versus FM1808-45-SG, it trades F-RAM's infinite endurance for lower standby power and proven 20-year retention at elevated temperature.

Availability

CY14B101L-SP45XI is available at Aetrix Electronics and suitable for industrial data loggers, telecom control cards, medical diagnostic equipment, and programmable logic controllers requiring stable component supply and long-term obsolescence management.

Supply support for CY14B101L-SP45XI 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 infrastructure.

The CY14B101L belongs to Cypress's nvSRAM product line, engineered specifically to replace battery-backed SRAM in mission-critical systems where maintenance-free, long-term data retention is non-negotiable.

FAQ

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

The CY14B101L-SP45XI requires a minimum 12 µF ±20% tantalum or polymer capacitor on the VCAP pin to ensure complete STORE execution during a VCC dropout event lasting ≥100 µs. Lower values risk partial STORE failure; derating to 15 µF is recommended for extended temperature or high-reliability applications.

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

Yes. The HSB pin has a weak internal pull-up and may be left floating when hardware STORE initiation and busy indication are unused. No external pull-up is required unless interfacing with open-drain logic or driving additional loads; leaving it unconnected does not affect AutoStore or software STORE functionality.

How does the CY14B101L prevent unintended STORE during brownout conditions?

The device monitors VCC against VSWITCH (2.7V typ.). Below this threshold, externally initiated STORE operations (via HSB or software sequence) are ignored, and WRITE cycles are inhibited until VCC rises above VSWITCH and a valid CE or WE edge is detected-preventing corrupted writes during unstable power transitions.

Is the CY14B101L-SP45XI pin-compatible with standard 32-pin SOIC SRAMs?

It is pin-compatible with STK14CA8-xxI-M1F in 32-pin SOIC, sharing identical A0–A16, DQ0–DQ7, CE, OE, WE, VCC, and VSS placements. However, CY14B101L adds dedicated HSB and VCAP pins (replacing NC and A16 positions), requiring minor PCB layout adaptation for full feature utilization.