Infineon Technologies CY14B104LA-ZS20XIT

Overview

CY14B104LA-ZS20XIT from Cypress Semiconductor is a 4-Mbit non-volatile SRAM (nvSRAM) with QuantumTrap technology, organized as 512K × 8, operating at 3 V ±10%, with 20 ns access time and industrial temperature range (–40°C to +85°C). It performs automatic STORE on power-down using an external VCAP capacitor and supports software- or hardware-triggered STORE/RECALL. Used in industrial controllers for real-time data retention during unexpected power loss.

For engineers reviewing the CY14B104LA-ZS20XIT datasheet, CY14B104LA-ZS20XIT pinout, CY14B104LA-ZS20XIT application, or CY14B104LA-ZS20XIT equivalent, key selection criteria include AutoStore timing, VCAP capacitance requirement (0.1 µF), HSB pin behavior during STORE, and compatibility with ×8 bus interfaces in legacy industrial systems.

Technical Context

This nvSRAM integrates standard SRAM cells with parallel-connected QuantumTrap non-volatile elements per cell, enabling simultaneous STORE/RECALL across all 524,288 bytes. The architecture decouples volatile read/write (infinite cycles) from non-volatile endurance (1 million STOREs, 20-year retention).

AutoStore is initiated autonomously when VCC drops below VSWITCH (~2.7 V), triggering internal charge transfer from VCAP to complete one full STORE cycle. Hardware STORE uses the open-drain HSB pin with 100 kΩ internal pull-up and tDELAY timing; software STORE relies on address-based command sequences without pin dependency.

Key Specifications

Pinout & Package

Package: 44-pin Thin Small Outline Package (TSOP II), Type 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 FM24V04-G, CY14B104LA-ZS20XIT delivers the fastest access (20 ns), integrated AutoStore with VCAP simplicity, and HSB-driven hardware control-making it optimal for time-critical industrial systems where deterministic STORE timing and minimal external components are essential.

Availability

CY14B104LA-ZS20XIT is available at Aetrix Electronics and suitable for industrial PLC data logging, medical device parameter storage, and avionics black box buffering requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CY14B104LA-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 IoT applications, with focus on integration, low-power operation, and functional safety.

CY14B104LA belongs to Cypress's QuantumTrap nvSRAM product line, engineered specifically for mission-critical systems needing battery-free, fast, and infinitely writable non-volatile memory without firmware overhead.

FAQ

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

The CY14B104LA-ZS20XIT requires a minimum 0.1 µF ceramic capacitor on the VCAP pin to ensure successful AutoStore at VCC = 2.7 V and +85°C. Larger values (e.g., 0.22 µF) improve margin under rapid VCC droop or extended hold times but do not extend STORE endurance or retention. Tantalum or electrolytic capacitors are not recommended due to ESR and leakage limitations.

Can the HSB pin be left unconnected in systems that only use software STORE?

Yes - the HSB pin may be left floating or tied HIGH via external pull-up if hardware STORE is unused. The internal 100 kΩ weak pull-up ensures HSB remains HIGH during idle states. However, leaving HSB unconnected does not disable AutoStore or software STORE functionality; those remain fully operational and independent of HSB pin state.

Does RECALL occur automatically after every power-up event?

Yes - RECALL is unconditional and automatic on every power-up, restoring the last stored image from QuantumTrap cells to SRAM within 100 µs. No software initialization or pin assertion is required. This behavior is hardwired and cannot be disabled, ensuring guaranteed data restoration even after catastrophic power loss.

How does the device prevent unintended STORE during transient VCC dips?

The CY14B104LA-ZS20XIT monitors VCC against a precision VSWITCH threshold (~2.7 V). STORE initiates only when VCC falls *below* VSWITCH *and* remains there long enough to discharge internal regulators - rejecting sub-millisecond glitches. Additionally, AutoStore is inhibited unless at least one SRAM write has occurred since the last STORE or RECALL, preventing spurious saves during idle periods.