Cypress Semiconductor Corp CY14B104LA-ZS25XI

Overview

CY14B104LA-ZS25XI from Cypress Semiconductor is a 4-Mbit non-volatile SRAM (nvSRAM) with 512K × 8 organization, 25 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-triggered STORE/RECALL operations - deployed in mission-critical data logging systems where volatile memory loss must be prevented without battery backup.

For engineers reviewing the CY14B104LA-ZS25XI datasheet, CY14B104LA-ZS25XI pinout, CY14B104LA-ZS25XI application, or CY14B104LA-ZS25XI equivalent, key selection criteria include AutoStore timing compliance, VCAP capacitor sizing (0.1 µF), HSB pin behavior during STORE busy state, ×8 vs ×16 configuration compatibility, and industrial-grade data retention (20 years).

Technical Context

The CY14B104LA-ZS25XI integrates standard SRAM array (2048 × 2048) with parallel QuantumTrap non-volatile elements per cell, enabling simultaneous STORE/RECALL across all 524,288 bytes. Its STORE operation is triggered by voltage drop below VSWITCH (2.2 V), initiating autonomous charge transfer from VCAP to retain data without host intervention.

It supports three STORE initiation modes: AutoStore (power-loss detection), Hardware STORE (HSB pin assertion), and Software STORE (address-sequence write). RECALL occurs automatically at power-up or via software command. The device inhibits SRAM access during STORE/RECALL cycles and uses internal logic to prevent spurious stores unless at least one write has occurred since last non-volatile operation.

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 FM24V10-G and MB85RS4MT, CY14B104LA-ZS25XI uniquely integrates VCAP-regulated AutoStore with zero external components, delivers deterministic 25 ns SRAM performance, and guarantees 20-year retention - making it optimal for cost-sensitive, safety-critical industrial systems requiring autonomous power-fail resilience.

Availability

CY14B104LA-ZS25XI is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, railway signaling controllers, and programmable logic controllers requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for CY14B104LA-ZS25XI 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-ZS25XI belongs to the QuantumTrap nvSRAM product line, engineered specifically for applications demanding battery-free, instant-on non-volatility with SRAM speed and infinite read/write endurance.

FAQ

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

The CY14B104LA-ZS25XI requires a 0.1 µF X7R ceramic capacitor on the VCAP pin. This value ensures sufficient charge to complete the STORE operation within the specified tSTORE time (<10 ms) when VCC drops below VSWITCH (2.2 V). Larger capacitors extend hold-up time but do not improve reliability beyond this threshold; undersized capacitors risk incomplete STORE and data corruption.

How does the HSB pin behave during and after a STORE operation?

HSB is an open-drain output that the device drives LOW during any STORE (AutoStore, Hardware, or Software). After completion, it is actively driven HIGH for tHHHD (≤100 ns), then held HIGH by an internal 100 kΩ pull-up. External pull-up is optional but recommended for noise immunity. HSB remains LOW until STORE finishes - critical for synchronizing host shutdown sequences.

Can CY14B104LA-ZS25XI be used in ×16 mode?

No - CY14B104LA-ZS25XI is specifically the ×8 variant (512K × 8). The ×16 version is CY14B104NA. Pinout, address mapping (A0–A18 vs A0–A17), and data bus width (DQ0–DQ7 only) are fixed for this part number. Attempting ×16 operation will result in incorrect addressing and data corruption.

Is software STORE affected by the "write-since-last-STORE" guard condition?

No - unlike AutoStore and Hardware STORE, software-initiated STORE executes unconditionally regardless of whether a write has occurred since the last STORE or RECALL. This enables deterministic, testable non-volatile updates during diagnostics or firmware updates, independent of prior SRAM activity.