Infineon Technologies CY14B104LA-ZS20XI

Overview

CY14B104LA-ZS20XI from Cypress Semiconductor is a 4-Mbit non-volatile SRAM (nvSRAM) with 512K × 8 organization, 20 ns access time, single 3 V (+20%, –10%) supply, industrial temperature range (–40°C to +85°C), and QuantumTrap non-volatile storage technology. It performs automatic STORE on power-down using an external VCAP capacitor and supports software- or hardware-initiated STORE/RECALL cycles for data retention in mission-critical systems such as industrial PLCs and telecom base station controllers.

For engineers reviewing the CY14B104LA-ZS20XI datasheet, CY14B104LA-ZS20XI pinout, CY14B104LA-ZS20XI application, or CY14B104LA-ZS20XI equivalent, key selection criteria include AutoStore timing compliance, VCAP capacitor sizing (0.1 µF), HSB pin behavior during STORE busy state, and ×8 vs ×16 configuration compatibility with existing memory bus architecture.

Technical Context

This nvSRAM integrates standard fast SRAM with embedded QuantumTrap non-volatile elements per cell, enabling parallel STORE/RECALL across all 524,288 bytes. The device uses internal voltage regulation to charge VCAP and initiates AutoStore when VCC drops below VSWITCH (~2.7 V), ensuring deterministic data capture without host intervention.

STORE operations are conditional: hardware or AutoStore only execute after at least one SRAM write since last STORE/RECALL; software STORE bypasses this condition. HSB serves dual role - input to trigger STORE and open-drain output indicating active STORE (LOW) or completion (HIGH with weak pull-up).

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 STK14C88-3AJ and FM24CL64B, CY14B104LA-ZS20XI delivers deterministic, zero-software AutoStore with 20 ns parallel access-making it uniquely suited for real-time systems where latency, autonomy, and bus compatibility are non-negotiable.

Availability

CY14B104LA-ZS20XI is available at Aetrix Electronics and suitable for industrial PLCs, telecom base stations, avionics health monitors, and medical infusion pumps requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for CY14B104LA-ZS20XI 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.

CY14B104LA belongs to the QuantumTrap nvSRAM product line, engineered specifically for systems demanding battery-free, autonomous data retention during power interruptions without compromising SRAM speed or interface simplicity.

FAQ

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

The CY14B104LA-ZS20XI requires a 0.1 µF X7R ceramic capacitor on the VCAP pin, placed within 5 mm of the package. This value ensures sufficient energy for one full STORE cycle when VCC drops from 3.0 V to VSWITCH (2.7 V). Larger capacitors extend STORE margin but do not improve timing; undersized capacitors risk incomplete STORE and data corruption.

Can CY14B104LA-ZS20XI operate in ×16 mode?

No. CY14B104LA-ZS20XI is factory-configured for 512K × 8 organization only. The CY14B104NA variant supports 256K × 16. Pinout, address mapping (A0–A18), and data bus (DQ0–DQ7) are fixed for ×8 operation; attempting ×16 use will result in incorrect addressing and data corruption.

How does the HSB pin behave during power-up and power-down sequences?

At power-up, HSB is initially HIGH (weak pull-up), then goes LOW briefly during RECALL, returning HIGH once RECALL completes (~150 µs). During power-down, HSB remains HIGH until VCC crosses VSWITCH, then goes LOW for the duration of AutoStore (~10 ms), and returns HIGH upon completion-even if VCC continues falling.

Is software STORE compatible with all microcontroller families?

Yes-software STORE uses a standard address-based unlock sequence (write 0x0000, 0x0001, 0x0002 to address 0x0000) that requires no special timing or bus protocols. It works with any MCU supporting asynchronous SRAM timing, including ARM Cortex-M, Renesas RX, and TI C2000 series, provided WE and CE are properly controlled.