Infineon Technologies CY14B104N-BA45XCT

Overview

CY14B104N-BA45XCT from Cypress Semiconductor is a 4 Mbit nonvolatile SRAM (nvSRAM) with 256K × 16 organization, 45 ns access time, single 3V (+20% to –10%) supply, and QuantumTrap® nonvolatile storage. It performs automatic STORE on power loss using VCAP capacitor support and supports software/hardware-initiated STORE/RECALL. Used in industrial control modules requiring persistent memory without battery backup.

For engineers reviewing the CY14B104N-BA45XCT datasheet, CY14B104N-BA45XCT pinout, CY14B104N-BA45XCT application, or CY14B104N-BA45XCT equivalent, key selection criteria include x16 bus interface compatibility, AutoStore timing (tSTORE = 15 ms max), HSB pin behavior for hardware store acknowledgment, and VCAP capacitor sizing (0.1 µF ±20%).

Technical Context

This nvSRAM integrates standard SRAM cells with embedded QuantumTrap nonvolatile elements per cell, enabling parallel STORE/RECALL across all 256K words. It operates in three STORE modes: AutoStore (power-loss triggered), Hardware Store (HSB pin asserted), and Software Store (6-address sequence). RECALL occurs automatically at power-up or via software command.

The device uses 17 address lines (A0–A16) for x16 configuration, with BHE/ BLE byte enables controlling DQ15–DQ8 and DQ7–DQ0 respectively. HSB functions as both input (to initiate STORE) and open-drain output (to signal STORE busy), while VCAP supplies regulated energy for nonvolatile write during VCC dropout.

Key Specifications

Pinout & Package

Package: 48-ball Fine-Pitch Ball Grid Array (FBGA), 6 mm × 8 mm, 0.8 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14C88-3A55I and FM24V04-G, CY14B104N-BA45XCT uniquely delivers x16 interface, 45 ns speed, HSB signaling, and software-controlled STORE/RECALL - making it optimal for industrial MPU-based systems needing deterministic, low-latency nonvolatile persistence.

Availability

CY14B104N-BA45XCT is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion devices, automotive black boxes, and network edge routers requiring stable component supply across extended product lifecycles.

Supply support for CY14B104N-BA45XCT 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.

CY14B104N belongs to the QuantumTrap nvSRAM product line, engineered specifically for mission-critical applications demanding battery-free nonvolatility, deterministic STORE/RECALL timing, and industrial temperature resilience.

FAQ

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

The CY14B104N-BA45XCT requires a 0.1 µF ±20% X7R ceramic capacitor connected between VCAP and VSS. This value ensures sufficient charge to complete one full STORE operation during VCC dropout down to VSWITCH (2.2 V typical). Larger capacitors do not improve reliability and may increase power-up time.

Can HSB be left unconnected if hardware STORE is not used?

Yes - HSB has an internal weak pull-up and may be left floating if unused. When disconnected, the pin remains HIGH during normal operation and does not initiate STORE. However, leaving it unconnected forfeits hardware STORE capability and removes the ability to monitor STORE busy status externally.

How does the software STORE sequence prevent accidental activation?

The software STORE requires six exact CE-controlled read operations to consecutive addresses (0x4E38, 0xB1C7, 0x83E0, 0x7C1F, 0x703F, 0x8FC0) with WE held HIGH throughout. Any intervening write, address violation, or timing violation aborts the sequence - ensuring STORE is never triggered by spurious bus activity.

Is RECALL performed automatically after every power cycle?

Yes - RECALL initiates automatically whenever VCC rises above VSWITCH (~2.2 V) after dropping below it. The device latches the power-up condition internally and executes RECALL in ~15 ms (tHRECALL), driving HSB LOW during the operation. No firmware intervention is required for basic power-cycle recovery.