Infineon Technologies CY14B104NA-BA25I

Overview

CY14B104NA-BA25I from Cypress Semiconductor is a 4-Mbit non-volatile SRAM (nvSRAM) with 256K × 16 organization, single 3 V (+20%, –10%) supply, 25 ns access time, and QuantumTrap non-volatile storage. It performs automatic STORE on power-down using an external VCAP capacitor and supports software/hardware-initiated STORE/RECALL. Used in industrial control systems requiring persistent memory without battery backup.

For engineers reviewing the CY14B104NA-BA25I datasheet, CY14B104NA-BA25I pinout, CY14B104NA-BA25I application, or CY14B104NA-BA25I equivalent, key selection criteria include ×16 bus interface support, HSB-controlled hardware STORE timing, VCAP-based AutoStore reliability, and industrial temperature operation (–40°C to +85°C).

Technical Context

The CY14B104NA-BA25I integrates standard SRAM array (2048 × 2048) with parallel QuantumTrap non-volatile elements per cell, enabling simultaneous STORE/RECALL across all 256K words. Its dual-mode operation-SRAM read/write at full speed and atomic non-volatile transfer-relies on internal power switching between VCC and VCAP during voltage collapse.

STORE is triggered by power loss (AutoStore), HSB pin assertion, or software address sequence; RECALL occurs automatically at power-up or via software command. The device inhibits SRAM access during STORE/RECALL cycles and uses BHE/BLE for byte-select control in ×16 mode, with HSB serving as both input request and open-drain busy indicator.

Key Specifications

Pinout & Package

Package: 48-ball fine-pitch ball grid array (FBGA), RoHS-compliant, 7 mm × 9 mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FM24V10-G and AS4C4M16SA-6BIN, CY14B104NA-BA25I uniquely delivers hardware-triggered STORE, hands-off AutoStore, and verified 20-year retention in a single-package solution - reducing system-level validation burden for industrial safety-critical applications.

Availability

CY14B104NA-BA25I is available at Aetrix Electronics and suitable for industrial PLCs, medical imaging devices, and railway signaling systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for CY14B104NA-BA25I 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 targets applications needing battery-free non-volatility with SRAM speed - specifically engineered for deterministic STORE/RECALL in mission-critical infrastructure where power integrity cannot be assumed.

FAQ

What is the function of the VCAP pin, and what capacitor value is required?

The VCAP pin connects to an external 0.1 µF ceramic capacitor that stores charge during normal operation. When VCC drops below VSWITCH (~2.5 V), the internal regulator isolates VCAP and uses its stored energy to complete one full STORE operation. Using a smaller capacitor risks incomplete STORE and data corruption; larger values do not improve reliability and may slow charging.

How does the HSB pin operate during STORE initiation and completion?

HSB is an open-drain pin with internal 100 kΩ weak pull-up. When driven LOW externally, it initiates a conditional STORE after tDELAY (max 100 ns). During STORE execution, HSB is actively driven LOW. Upon completion, it is driven HIGH for tHHHD (min 10 ns), then held HIGH by the internal pull-up. Systems must monitor HSB to avoid issuing new commands during busy periods.

Can CY14B104NA-BA25I be used in ×8 mode, or is it strictly ×16?

CY14B104NA is exclusively 256K × 16 organized - it does not support ×8 operation. The CY14B104LA variant is the 512K × 8 version. Pin assignments, address range (A0–A17), and data bus width (DQ0–DQ15) are fixed for ×16; attempting ×8 usage will result in incorrect addressing and data corruption.

What happens if AutoStore is enabled but no capacitor is connected to VCAP?

If AutoStore is enabled (default state) and no capacitor is connected to VCAP, the device attempts STORE during power loss but lacks sufficient energy - resulting in incomplete transfer and corrupted data in the non-volatile array. The datasheet mandates disabling AutoStore via software sequence if VCAP is omitted, and Cypress confirms this condition invalidates data retention guarantees.