Infineon Technologies CY14B108L-ZS20XIT

Overview

CY14B108L-ZS20XIT from Cypress Semiconductor is an 8-Mbit nonvolatile SRAM (nvSRAM) with ×8 organization (1024 K × 8), 20 ns access time, single 3 V (+20% / –10%) supply, and industrial temperature range (–40°C to +85°C). It integrates QuantumTrap nonvolatile storage per cell, enabling automatic STORE on power-down via external VCAP capacitor and software- or hardware-triggered STORE/RECALL. Used in industrial PLCs, metering systems, and network equipment requiring persistent memory without battery backup.

For engineers reviewing the CY14B108L-ZS20XIT datasheet, CY14B108L-ZS20XIT pinout, CY14B108L-ZS20XIT application, or CY14B108L-ZS20XIT equivalent, key selection criteria include AutoStore timing compliance, HSB busy signaling behavior, VCAP capacitor sizing (0.1 µF), ×8 vs ×16 configuration compatibility, and software STORE address sequence requirements.

Technical Context

The CY14B108L-ZS20XIT implements a dual-cell architecture: standard fast SRAM paired with QuantumTrap nonvolatile elements. All 1,048,576 bytes are stored and recalled in parallel, with STORE/RECALL operations inhibiting SRAM access during execution. The device supports infinite SRAM read/write cycles and up to 1 million STORE cycles to nonvolatile cells.

AutoStore initiates when VCC drops below VSWITCH (typ. 2.7 V), using charge from the VCAP capacitor (0.1 µF, connected to dedicated VCAP pin). Hardware STORE is triggered by pulling HSB low, while software STORE uses a specific address write sequence. RECALL occurs automatically at power-up or via software command, restoring data in tHRECALL ≤ 20 ms.

Key Specifications

Pinout & Package

Package: 44-pin Thin Small Outline Package (TSOP II), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14C88-3A35I and FM24V10-G, the CY14B108L-ZS20XIT uniquely delivers 8-Mbit density, 20 ns speed, and autonomous AutoStore - making it optimal for industrial systems needing fast, reliable, zero-firmware nonvolatile storage.

Availability

CY14B108L-ZS20XIT is available at Aetrix Electronics and suitable for industrial PLCs, smart metering systems, and telecom line cards requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for CY14B108L-ZS20XIT 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 nvSRAM product line was engineered specifically for battery-free, high-endurance nonvolatile data retention in mission-critical embedded systems operating under unstable power conditions.

FAQ

What is the required VCAP capacitor value and type for reliable AutoStore operation?

The CY14B108L-ZS20XIT requires a 0.1 µF X7R ceramic capacitor rated for ≥10 V, placed within 5 mm of the VCAP pin with low-inductance routing. This capacitor supplies energy for the entire STORE operation during VCC dropout. Larger values do not improve performance and may delay power-up RECALL timing.

Does the device support both ×8 and ×16 configurations, and how is configuration selected?

No - CY14B108L-ZS20XIT is exclusively ×8 (1024 K × 8). The ×16 variant is CY14B108N. Configuration is hardwired by die mask; no pin strapping or mode register selects bus width. Pinout and address mapping differ between L and N versions - mixing them causes functional failure.

How does the HSB pin behave during a STORE operation, and what external circuitry is needed?

HSB is an open-drain output driven LOW by the device during STORE/RECALL. To initiate hardware STORE, drive HSB externally LOW for ≥100 ns. No pull-up is mandatory (internal 100 kΩ exists), but a 10 kΩ external pull-up improves noise immunity. Do not leave HSB floating in systems where STORE is unused.

Is the AutoStore Disable feature functional in this revision, and what is the workaround if needed?

No - the AutoStore Disable feature is nonfunctional per Errata on page 24 of datasheet 001-45523 Rev. *P. If AutoStore must be suppressed, omit the VCAP capacitor and ensure VCAP pin is left unconnected or tied to VSS through ≥100 kΩ resistor to prevent spurious STORE attempts during power ramp.